RFC 4639
Cable Device Management Information Base for Data-Over-Cable Service Interface Specification (DOCSIS) Compliant Cable Modems and Cable Modem Termination Systems
RFC 4639: Cable Device MIB for DOCSIS Cable Modems and CMTSes 🎀
okay bestie, RFC 4639 is giving "network management glow-up" 💅✨ part 1 of 16 (more parts coming, so stay with me 🧚)
Here's the lowdown: it's written by R. Woundy (Comcast Cable) and K. Marez (Motorola), it's a Standards Track document, it's dated December 2006, and it obsoletes RFC 2669. The official title is "Cable Device Management Information Base for Data-Over-Cable Service Interface Specification (DOCSIS) Compliant Cable Modems and Cable Modem Termination Systems" 🦋
It's filed under the Network Working Group as Request for Comments: 4639.
Table of Contents:
1. The Internet-Standard Management Framework ......................3
2. Glossary ........................................................3
2.1. CATV .......................................................3
2.2. CM or Cable Modem ..........................................3
2.3. CMTS or Cable Modem Termination System .....................3
2.4. DOCSIS or Data-Over-Cable Service Interface Specification ..3
2.5. Downstream .................................................4
2.6. Head-End ...................................................4
2.7. Media Access Control (MAC) Packet ..........................4
2.8. RF .........................................................4
2.9. Simple Network Management Protocol (SNMP) ..................4
2.10. Upstream ..................................................4
3. Introduction ....................................................4
3.1. Structure of the MIB .......................................5
3.1.1. IMPORTed MIB Modules and REFERENCE Clauses ..........6
3.1.2. Persistence Model for Cable Modems ..................6
3.1.3. IPv4 Compliance .....................................6
3.2. Management Requirements ....................................7
3.2.1. Handling of Software Upgrades .......................7
3.2.2. Events and Notifications ............................8
3.2.3. Notification Throttling .............................8
3.2.3.1. Notification Rate Throttling ...............8
3.2.3.2. Limiting the Notification Rate .............9
3.3. Protocol Filters ...........................................9
3.3.1. Inbound LLC Filters: docsDevFilterLLCTable .........10
3.3.2. Special Filters ....................................11
3.3.2.1. IP Spoofing Filters:
docsDevCpeTable, docsDevCpeInetTable ......11
3.3.2.2. SNMP Access Filters:
docsDevNmAccessTable ......................11
3.3.3. IP Filtering: docsDevFilterIpTable .................12
3.3.4. Outbound LLC Filters ...............................13
4. Definitions ....................................................13
5. Acknowledgements ...............................................78
5.1. Revision Descriptions .....................................78
6. Security Considerations ........................................79
7. IANA Considerations ............................................82
8. References .....................................................83
8.1. Normative References ......................................83
8.2. Informative References ....................................85Status of This Memo 📜
this one's the official vibe check: it's an Internet standards track protocol for the Internet community, and it's asking for discussion and suggestions for improvements 🫶 if you want the standardization state and status, go check the current edition of the "Internet Official Protocol Standards" (STD 1) 💜 and yes, distribution of this memo is unlimited ✨
Copyright Notice
Copyright (C) The IETF Trust (2006).
Abstract 🌸
so the main thing this memo does is define a chunk of the Management Information Base (MIB) for network management protocols in the Internet community 🧚 specifically, it's a basic set of managed objects for SNMP-based management of DOCSIS-compliant Cable Modems and Cable Modem Termination Systems 🔥
and yes, it obsoletes RFC 2669 🙈
1. The Internet-Standard Management Framework ✨
if you want the full tour of the Internet-Standard Management Framework docs, check out section 7 of RFC 3410 [RFC3410] 🎀
okay so managed objects get accessed through a virtual information store called the Management Information Base, or MIB 🦋 MIB objects are usually accessed through the Simple Network Management Protocol (SNMP), and they get defined using the Structure of Management Information (SMI) 💅 this memo specifies a MIB module that's compliant with SMIv2, which is described in STD 58, RFC 2578 [RFC2578], STD 58, RFC 2579 [RFC2579] and STD 58, RFC 2580 [RFC2580] 👑
2. Glossary 🌈
the terms in here either come from normal cable system usage, or from the documents tied to the Data-Over-Cable Service Interface Specification (DOCSIS) process 💖
2.1. CATV 📺
originally "Community Antenna Television," but now it's used for any cable or hybrid fiber and cable system that delivers video signals to a community 🫶
2.2. CM or Cable Modem 💜
a CM acts as a "slave" station in a DOCSIS-compliant cable data system 🧚
2.3. CMTS or Cable Modem Termination System 👑
this is a generic term for a cable bridge or cable router in a head-end 🎀 a CMTS acts as the master station in a DOCSIS-compliant cable data system 🔥 it's the only station that transmits downstream, and it controls the scheduling of upstream transmissions by its associated CMs 💅
2.4. DOCSIS or Data-Over-Cable Service Interface Specification 🍓
this one refers to the ITU-T Recommendation J.112 [ITU-T_J.112], Annex B, standard for cable modem systems ✨ see also [RFI1.0] [RFI1.1] [RFI2.0] 🦋
2.5. Downstream ⬇️
the direction from the head-end towards the subscriber 🌸
2.6. Head-End 🏠
the origination point in most cable systems for the subscriber video signals 💖 it's also generally where the CMTS equipment lives 🧚
2.7. Media Access Control (MAC) Packet 📦
a DOCSIS Packet Data Unit 💜
2.8. RF 📡
Radio Frequency 🫶
2.9. Simple Network Management Protocol (SNMP) 🌈
the protocol used for network access to Management Information Base (MIB) objects 🔥 the three most commonly used versions are Version 1 (SNMPv1), Version 2 (SNMPv2c), and Version 3 (SNMPv3) 👑
2.10. Upstream ⬆️
the direction from the subscriber towards the head-end 💅
3. Introduction 🎀
this MIB module gives you a set of objects you need to manage DOCSIS-compliant Cable Modems (CM) and Cable Modem Termination Systems (CMTS) ✨ the spec is derived from the DOCSIS Radio Frequency Interface specification [RFI1.0] 🦋
Please note that the DOCSIS 1.0 standard only required Cable Modems to implement SNMPv1 and to process Internet Protocol Version 4 (IPv4) customer traffic 🙈 the design choices in the original version of this MIB module reflected those requirements 💜 DOCSIS 1.1 [RFI1.1] and DOCSIS 2.0 [RFI2.0] require support for SNMPv3, as well as for SNMPv1 and SNMPv2c, and the changes in this MIB module over the previous proposed standard version reflect those extra requirements 🔥
future versions of DOCSIS, starting with DOCSIS 3.0 [MULPI3.0], are expected to require support for the Internet Protocol Version 6 (IPv6) as both a Customer Premise Equipment (CPE) protocol and one supported by the network elements of the DOCSIS CMTS/CM system 🌈 main character energy for sure 👑
the key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in [RFC2119] 🫶
3.1. Structure of the MIB 🧚
this MIB module is structured into seven components 💖 a component contains one or more MIB groups related by deprecation or logical extension 🎀
- The docsDevBaseGroup extends the MIB-II 'system' group of RFC3418 [RFC3418] with objects needed for cable device system management. Related to this group is the docsDevBaseIgmpGroup (enabling Internet Group Management Protocol (IGMP) status and control) and the docsDevBaseMaxCpeGroup (managing the maximum number of CPEs permitted access through the cable modem).
- The docsDevNmAccessGroup and the docsDevNmAccessExtGroup provide a minimum level of SNMP access security (see Section 2.7 of [OSSI1.0], Section 2 of [OSSI1.1], and Section 5 of [OSSI2.0]). With the completion of the SNMP coexistence document, RFC 3584 [RFC3584], these groups have been deprecated in this version of the MIB.
- The docsDevSoftwareGroup, updated by the docsDevSoftwareGroupV2, provides information for network-downloadable software upgrades. See "Handling of Software Upgrades", below.
- The docsDevServerGroup, updated by the docsDevServerGroupV2, provides information about the progress of the interaction between the CM or CMTS and various provisioning servers.
- The docsDevEventGroup, updated by the docsDevEventGroupV2, provides control and logging for event reporting. With the addition of the SNMP Notification MIB, RFC 3413 [RFC3413], and Notification Log MIB, RFC 3014 [RFC3014], which cover event reporting, the objects in this MIB module have been modified to allow for the usage of these RFCs.
- The docsDevFilterGroup configures filters at the link layer and IP layer for bridged data traffic. This group has been deprecated in this version of the MIB in favor of the docsDevFilterLLCGroup, and by groups from the Differentiated Services MIB [RFC3289] -- specifically, the groups representing the Data Path, Classifier, and Actions tables from that MIB.
- The docsDevCpeGroup, updated by the docsDevInetCpeGroup, provides control over which IP addresses may be used by CPEs (e.g., PCs) serviced by a given cable modem. This provides anti-spoofing control at the point of origin for a large cable modem system. This group is separate from docsDevFilter, primarily as this group is only implemented on the Cable Modem (CM) and MUST NOT be implemented on the Cable Modem Termination System (CMTS).
3.1.1. IMPORTed MIB Modules and REFERENCE Clauses 📚
this MIB module IMPORTs definitions normatively from the following MIB modules, beyond [RFC2578], [RFC2579], and [RFC2580]: INET-ADDRESS-MIB [RFC4001], SNMP-FRAMEWORK-MIB [RFC3411], IF-MIB [RFC2863], RMON2-MIB [RFC4502], and DIFFSERV-MIB [RFC3289] 💖
this MIB module also includes DESCRIPTION and REFERENCE clauses that normatively refer to [RFC868], [RFC3617], [RFI1.0], [RFI1.1], [RFI2.0], [OSSI1.1], and [OSSI2.0] 🫶
3.1.2. Persistence Model for Cable Modems 💾
okay so most of the tables in this MIB module (like docsDevNmAccessTable and docsDevFilterLLCTable) are specified to NOT let objects persist across reboots 🙈
the expectation (and current operational practice) is that on reboot, these tables get cleared and repopulated from the DOCSIS configuration file supplied by the cable operator 🔥 this lets a cable modem adapt to the current cable operator's environment, which in turn makes cable modems portable across different cable operators 🦋
the big exception is docsDevEventTable, since it's super useful to keep a record of events across reboots for debugging 💜🎀
Part 2 is next, so keep your eyes peeled ✨👀
3.1.3. IPv4 Compliance
okay bestie, heads up 💅 the compliance statements in this version of the MIB only ask for IPv4 addresses 🌸 why? because the current DOCSIS versions (1.0, 1.1, and 2.0) aren't IPv6 capable yet 🙈 IPv6 support will need changes to the DOCSIS protocols first, but the MIB itself should only need new compliance statements that require IPv6 address support. it's giving future-proof 🦋
3.2. Management Requirements
3.2.1. Handling of Software Upgrades
the cable modem software upgrade process is written up in [RFI1.0] ✨ from a network management station, the operator:
- sets docsDevSwServer to the address of the Trivial File Transfer Protocol (TFTP) server for software upgrades;
- sets docsDevSwFilename to the file pathname of the software upgrade image; and
- sets docsDevSwAdminStatus to
upgrade-from-mgt.
DOCSIS only specifies TFTP [RFC1350] for file transfers 📁 but other functional entities in the cable device (especially a PacketCable Multimedia Terminal Adapter [MTA-PROV]) define an optional implementation of the Hyper Text Transfer Protocol (HTTP) [RFC1945] and [RFC2616] for file transfers too 🧚 the value of the docsDevSwServerTransportProtocol object decides which protocol gets used for an SNMP-initiated software upgrade 💜
one reason to do an SNMP-initiated upgrade is to load a temporary software image (think special diagnostic software 🔍) that's different from the usual software on that device, without changing the provisioning database 🫶
and here's the thing, software upgrades should not be accepted blindly by the cable device 😤 the device may refuse an upgrade if:
- the download is incomplete;
- the file contents are incomplete or damaged; or
- the software is not intended for that hardware device (this can include a feature set that hasn't been purchased for this device).
a cable device that implements the code verification mechanisms of [BPIPLUS] checks the source and integrity of the downloaded image by validating one or more Code Verification Signatures bundled inside the software upgrade. that's the security glow-up we love to see 🔐✨
3.2.2. Events and Notifications
this MIB module gives you control over how events get reported 📣 through syslog [RFC3164], through notifications (traps and informs), and through non-volatile logging 💾 extra controls let the agent use the SNMP Notification MIB [RFC3413] and Notification Log MIB [RFC3014] for event notification too 🌈
the conventions for event reporting are outside the scope of this document, so don't look for them here 🙅♀️ the definitions and coding of common DOCSIS notifications live in [RFC4547] 🎀
3.2.3. Notification Throttling
the CM and CMTS MUST provide support for notification message throttling, as described below 🚦 the network operator can use notification rate throttling (or notification limiting) by tweaking the right MIB variables 🎛️
3.2.3.1. Notification Rate Throttling
network operators can pick either of two rate control methods 💅 in the first one, the device stops sending notifications once the rate goes over the specified maximum message rate 🛑 it only starts sending again if a network management station reactivates it with a request 🔁
in the second method, the device starts sending notifications again once the rate drops below the specified maximum message rate 📉
the operator sets the specified maximum message rate by picking the measurement interval (in seconds) and the maximum number of notifications that can go out within that interval ⏱️ they can also check the operational throttling state (to see whether notifications are enabled or blocked by throttling) and both query and set the administrative throttling state (which controls the rate control method) 🧠
3.2.3.2. Limiting the Notification Rate
sometimes network operators want to cap how many notifications a device sends over a set time period 🧢 the device stops sending notifications once the count goes past the specified threshold, and it only resumes after the measurement interval has passed ⏳
the operator decides the maximum number of notifications they're willing to handle and sets the measurement interval to a big number (in hundredths of a second) 🍓 for this case, the administrative throttling state is set to stop at a threshold equal to that maximum number of notifications 🛑
for more technical motivation, check out "Techniques for Managing Asynchronously Generated Alerts" [RFC1224] 📚
3.3. Protocol Filters
the Cable Device MIB has objects for both Link Layer Control (LLC) and IP protocol filters 🔥 LLC protocol filter entries can limit CM forwarding to a restricted set of network-layer protocols (like IP, Internetwork Packet Exchange (IPX), Network Basic Input/Output System (NetBIOS), and Appletalk) 🦋
IP protocol filter entries can restrict upstream or downstream traffic based on source and destination IP addresses, transport-layer protocols (like Transport Control Protocol (TCP), User Datagram Protocol (UDP), and Internet Control Message Protocol (ICMP)), and source and destination TCP/UDP port numbers 🌸
generally, a cable modem applies filters (or, more properly, classifiers) in an order that fits the layering model 🧩 the inbound MAC (or LLC) layer filters go first, then the "special" filters, then the IP layer inbound filters, then the IP layer outbound filters, and finally any LLC outbound filters 👑
*****************
* LLC Filter In *
*****************
|
v
*******************
* Special Filters *
* | *
* v *
* ************ *
* * IP Spoof * *
* ************ *
* | *
* v *
* *************** *
* * SNMP Access * *
* *************** *
* | *
*******************
|
v
****************
* IP Filter In *
****************
|
v
*****************
* IP Filter Out *
*****************
|
v
******************
* LLC Filter Out *
******************3.3.1. Inbound LLC Filters: docsDevFilterLLCTable
the inbound LLC (or MAC or level-2) filters live in the docsDevFilterLLCTable 🗂️ they get applied to level-2 frames coming into the cable modem from either the RF MAC interface or one of the CPE interfaces (physical or logical) 📡 their job is to block the processing and forwarding of certain level-2 traffic that could mess up the network 🚫
as currently specified, the filters can be set so the modem either drops frames that match at least one filter, or processes a frame that matches at least one filter 🔀 for example, you could permit only IP (and ARP) traffic, or drop NetBIOS traffic 🙅♀️
3.3.2. Special Filters
special filters run after the IP module accepts the packet from the MAC layer, but before any other processing happens ⚡ they only apply to a very specific class of traffic 🎯
3.3.2.1. IP Spoofing Filters: docsDevCpeTable, docsDevCpeInetTable
IP spoofing filters apply to packets coming into the modem from one of the CPE interfaces 🕵️♀️ they're there to stop a subscriber from stealing or misusing IP addresses that weren't assigned to them 🙅♀️ if the filters are active (enabled), the source address of the IP packet has to match at least one IP address in one of these two tables (docsDevCpeTable or docsDevCpeInetTable), or the packet gets discarded without further processing 🗑️
to avoid any implementation confusion, the device checks docsDevCpeTable for the IP packet source address before it checks docsDevCpeInetTable 🧠
the table can fill itself automatically, where the first N different IP addresses seen from the CPE side of the cable modem get added to it 🤖 the spoofing filters are specified in docsDevCpeTable and docsDevCpeInetTable, and the policy for automatically creating filters in those tables is controlled by docsDevCpeEnroll and docsDevMaxCpe, plus the network management agent 💖
similar IP spoofing filter controls are defined for CMTS implementations in the Subscriber Management MIB [RFC4036] 🎀
3.3.2.2. SNMP Access Filters: docsDevNmAccessTable
SNMP access filters apply to SNMP packets coming in from any interface and destined for the cable modem 📩 if the packets come in from a CPE interface, the SNMP filters run after the IP spoofing filters 🔁 these filters only apply to SNMPv1 or SNMPv2c traffic, and they aren't consulted for SNMPv3 traffic (and an SNMPv3-only agent doesn't need to implement them) 🙈 SNMPv3 access control is specified in the User Security Model MIB, in [RFC3414] 🔐
with the SNMP coexistence document, RFC 3584 [RFC3584], the docsDevNmAccess table has been deprecated in this version of the MIB 🥀 check the body of the MIB for how agents should handle the interaction between RFC 3584 MIBs and this MIB 📖 we'll get there, babe ✨
3.3.3. IP Filtering: docsDevFilterIpTable ✨
Okay bestie, the IP Filtering table is a classifier 🦋 Every row is basically a template that gets compared against IP packets. The template has source and destination addresses (plus their masks), the upper level protocol (like TCP or UDP), source and destination port ranges, and Terms of Service (ToS) values. Each row also carries interface and traffic direction match values, and those get considered together with everything else. For a packet to match, every column in the row has to line up with the packet's fields, and the interface and direction items have to match too. No cap, it's a whole checklist 💅
When a packet shows up, the agent scans each table starting with the lowest numbered filter 🔍 If it finds a match, it applies the group of policies that's listed. Now here's the spicy part: if the matched filter has the continue bit set, the agent keeps scanning and can match more filters and apply more policies. This is what lets the agent take one set of actions for the 24.0.16/255.255.255.0 group and a different set for telnet packets going to or from 24.0.16.30. Those sets of actions don't have to cancel each other out, so they can stack 🌈
Once a packet matches, one of three things happens, depending on the docsDevFilterIpControl setting in that row:
- The packet gets dropped, and no further processing is needed. Bye bye 👋
- The packet gets accepted, and processing carries on.
- A set of policy actions gets applied to the packet.
If docsDevFilterIpContinue is set to true, the table keeps being scanned, and more matches might happen 🎀
When a packet matches and the docsDevFilterIpControl in the matched filter is 'policy', the value of docsDevFilterIpPolicyId is used as a selector into the docsDevFilterPolicyTable. This first level of indirection can lead to zero or more actions being taken. The docsDevFilterPolicyTable is scanned in row order, and every row where docsDevFilterPolicyId equals docsDevFilterIpPolicyId gets its docsDevFilterPolicyValue 'executed' 🧚
For an example of how these IP Filtering MIB tables get used, check out [RFC2669] 📚
Also, the IP Filtering table and its related tables are deprecated in this version of the MIB 😭 They've been replaced by the Data Path, Classifier, and Action tables from the Differentiated Services MIB [RFC3289]. For how agents should handle the interaction between the RFC 3289 MIBs and this MIB module, look at the body of the MIB itself 🫶
3.3.4. Outbound LLC Filters
Last but not least, any outbound LLC filters get applied to the packet right before it's emitted on the appropriate interface 🚀 This MIB module doesn't specify any outbound LLC filters. But section 3 of the DOCSIS Quality of Service (QoS) MIB, [RFC4323], does include outbound LLC filtering requirements, so go check that out too 💖
4. Definitions 👑
DOCS-CABLE-DEVICE-MIB DEFINITIONS ::= BEGIN
IMPORTS
MODULE-IDENTITY,
OBJECT-TYPE,
IpAddress,
Unsigned32,
Counter32,
Integer32,
zeroDotZero,
mib-2
FROM SNMPv2-SMI -- RFC 2578
RowStatus,
RowPointer,
DateAndTime,
TruthValue,
StorageType
FROM SNMPv2-TC -- RFC 2579
InetAddressType,
InetAddress
FROM INET-ADDRESS-MIB -- RFC 4001
OBJECT-GROUP,
MODULE-COMPLIANCE
FROM SNMPv2-CONF -- RFC 2580
SnmpAdminString
FROM SNMP-FRAMEWORK-MIB -- RFC 3411
InterfaceIndexOrZero
FROM IF-MIB -- RFC 2863
ZeroBasedCounter32
FROM RMON2-MIB -- RFC 4502
diffServMIBDataPathGroup,
diffServMIBClfrGroup,
diffServMIBClfrElementGroup,
diffServMIBMultiFieldClfrGroup,
diffServMIBActionGroup,
diffServMIBDscpMarkActGroup,
diffServMIBCounterGroup,
diffServMIBAlgDropGroup,
diffServDataPathStatus,
diffServClfrStatus,
diffServClfrElementStatus,
diffServMultiFieldClfrAddrType,
diffServMultiFieldClfrSrcAddr,
diffServMultiFieldClfrDstAddr,
diffServAlgDropStatus,
diffServDataPathStorage,
diffServClfrStorage,
diffServClfrElementStorage,
diffServMultiFieldClfrStorage,
diffServActionStorage,
diffServCountActStorage,
diffServAlgDropStorage,
diffServAlgDropType
FROM DIFFSERV-MIB; -- RFC 3289
docsDev MODULE-IDENTITY
LAST-UPDATED "200612200000Z" -- December 20, 2006
ORGANIZATION "IETF IP over Cable Data Network
Working Group"
CONTACT-INFO
" Rich Woundy
Postal: Comcast Cable
27 Industrial Avenue
Chelmsford, MA 01824 U.S.A.
Phone: +1 978 244 4010
E-mail: richard_woundy@cable.comcast.com
Kevin Marez
Postal: Motorola Corporation
6450 Sequence Drive
San Diego, CA 92121 U.S.A.
Phone: +1 858 404 3785
E-mail: kevin.marez@motorola.com
IETF IPCDN Working Group
General Discussion: ipcdn@ietf.org
Subscribe: http://www.ietf.org/mailman/listinfo/ipcdn
Archive: ftp://ftp.ietf.org/ietf-mail-archive/ipcdn
Co-chairs: Richard Woundy,
richard_woundy@cable.comcast.com
Jean-Francois Mule,
jf.mule@cablelabs.com"
DESCRIPTION
"This is the MIB Module for DOCSIS-compliant cable modems
and cable-modem termination systems.
Copyright (C) The IETF Trust (2006). This version
of this MIB module was published in RFC 4639; for full
legal notices see the RFC itself."
REVISION "200612200000Z" -- December 20, 2006
DESCRIPTION
"Second version, published as RFC 4639.
Modifications to this MIB module since RFC 2669 include:
- Deprecation of the docsDevFilter group in favor of the
DiffServ MIB groups, to enable support for IPv6
filtering and DiffServ Code Point (DSCP) marking.
- Deprecation of the docsDevCpeGroup in favor of the
docsDevCpeInetGroup, to enable support of IPv6.
- Addition of various InetAddress objects to enable
support of IPv6.
- Deprecation of docsDevNmAccessTable in favor of SNMP
Coexistence and SNMPv3 -- yet adding
docsDevNmAccessTrapVersion and clarifying
docsDevNmAccessIp for current use of this table,
- Addition of docsDevIgmpModeControl for management and
control of the IGMP mode of operation,
- Addition of docsDevMaxCpe for management of the
maxmium number of CPEs permitted access through a
cable modem,
- Addition of docsDevSwServerTransportProtocol, and
modifications to docsDevSoftware object DESCRIPTIONS,
to enable software downloads via either TFTP or HTTP,
- Replacement of docsDevEvThrottleInhibited with
docsDevEvThrottleThresholdExceeded to simplify
event threshold management,
- Modification of docsDevEvReporting to enable local
logging to the internal volatile log, and not to the
internal non-volatile log,
- Modification of the compliance statement to make the
docsDevCpe objects optional
- Created placeholders for two OIDs in the
docsDevFilterPolicyTable that were never used
- Modified the DESCRIPTION of
docsDevSwServerTransportProtocol and
docsDevSwServerAddressType to address the
dependence between each object
- Added a reference to docsDevServerConfigTftpAddress
- Clarified the scope of notifications that are covered
by docsDevEvThrottleThreshold
- Clarified an error condition that could occur when
doing a SET to docsDevEvReporting
- Defined each of the enumerated types for both
docsDevEvLevel and docsDevEvPriority
- Added UNITS clause to docsDevFilterLLCMatches,
docsDevFilterIpMatches, docsDevMaxCpe,
docsDevEvThrottleThreshold and docsDevEvCounts.
- Added REFERENCE clause to docsDevFilterIpProtocol
- Modified DESCRIPTION of docsDevCpeInetAddr to be
more protocol-neutral
- Removed the enumerated value (1) from both
docsDevCpeInetSource and docsDevCpeSource
- Covered additional read-write and read-create objects
in the Security Considerations section
- Modified the default value of docsDevNmAccessIpMask
to be consistent with OSSI specification
- Modified the SYNTAX of docsDevNmAccessCommunity and
docsDevNmAccessInterfaces in the Conformance
Statement section
- Added SYNTAX clause to docsDevEvReporting in the
Conformance Statement section
- Modified SYNTAX clause of docsDevEvReporting to
move new enumerated type to byte boundary
- Added references to DOCSIS 2.0 specifications to
multiple objects
- Clarified non-persistency across reboots for
all tables
- Clarified functionality of docsDevSw objects as
they relate to docsDevSwOperStatus
- Clarified enumerated types (9) and (10) for
docsDevServerBootState
- Defined the state of unknown(0) for the following
objects: docsDevServerDhcpAddressType,
docsDevServerTimeAddressType,
docsDevServerConfigTftpAddressType and
docsDevServerConfigTftpAddressType
- Modified the value in docsDevFilterIpDaddr to be
consistent with the SYNTAX
- Specified which rows could be modified in an
active row for docsDevFilterPolicyStatus
- Defined the term 'manually' in docsDevCpeEnroll
- Clarified the description for
docsDevFilterTosOrMask
- Covered the case of a non-existent row for
docsDevFilterPolicyPtr
- Added DEFVAL clauses for multiple objects
- Replaced docsDevNotification OBJECT IDENTIFIER
with docsDevNotifications to address possible
compatibility issues
- Added support for the usage of RFC 3413 and RFC 3014
as event notification mechanisms
- Removed docsDevFilterPolicyObsoleteGroup
- Added stdInterface(9) type to docsDevEvReporting to
support the usage of RFC3413 and RFC3014
- Modified DESCRIPTION for docsDevMaxCpe" REVISION "199908190000Z"
DESCRIPTION
"Initial version, published as RFC 2669."
::= { mib-2 69 }
docsDevMIBObjects OBJECT IDENTIFIER ::= { docsDev 1 }
docsDevBase OBJECT IDENTIFIER ::= { docsDevMIBObjects 1 }
--
-- For the following object, there is no concept in the
-- RFI specification corresponding to a backup CMTS. The
-- enumeration is provided here in case someone is able
-- to define such a role or device.
--
docsDevRole OBJECT-TYPE
SYNTAX INTEGER {
cm(1),
cmtsActive(2),
cmtsBackup(3)
}
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Defines the current role of this device. cm(1) is a
Cable Modem, cmtsActive(2) is a Cable Modem Termination
System that is controlling the system of cable modems,
and cmtsBackup(3) is a CMTS that is currently connected
but is not controlling the system (not currently used).
In general, if this device is a 'cm', its role will not
change during operation or between reboots. If the
device is a 'cmts' it may change between cmtsActive and
cmtsBackup and back again during normal operation. NB:
At this time, the DOCSIS standards do not support the
concept of a backup CMTS, but cmtsBackup is included for
completeness."
::= { docsDevBase 1 }
docsDevDateTime OBJECT-TYPE
SYNTAX DateAndTime
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"The current date and time, with time zone information
(if known).
If the real data and time cannot be determined, this
shall represent elapsed time from boot relative to
the standard epoch '1970-1-1,0:0:0.0'. In other
words, if this agent has been up for 3 minutes and
not been able to determine what the actual date and
time are, this object will return the value
'1970-1-1,0:03:0.0'."
::= { docsDevBase 2 }
docsDevResetNow OBJECT-TYPE
SYNTAX TruthValue
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"Setting this object to true(1) causes the device to
reset. Reading this object always returns false(2)."
::= { docsDevBase 3 }
docsDevSerialNumber OBJECT-TYPE
SYNTAX SnmpAdminString
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The manufacturer's serial number for this device."
::= { docsDevBase 4 }
docsDevSTPControl OBJECT-TYPE
SYNTAX INTEGER {
stEnabled(1),
noStFilterBpdu(2),
noStPassBpdu(3)
}
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"This object controls operation of the spanning tree
protocol (as distinguished from transparent bridging).
If set to stEnabled(1), then the spanning tree protocol
is enabled, subject to bridging constraints.
If noStFilterBpdu(2), then spanning tree is not active,
and Bridge PDUs received are discarded.
If noStPassBpdu(3), then spanning tree is not active,
and Bridge PDUs are transparently forwarded.
Note that a device need not implement all of these
options, but that noStFilterBpdu(2) is required."
DEFVAL { noStFilterBpdu }
::= { docsDevBase 5 }
docsDevIgmpModeControl OBJECT-TYPE
SYNTAX INTEGER {
passive(1),
active(2)
}
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"This object controls the IGMP mode of operation for
the CM or CMTS. In passive mode, the device forwards
IGMP between interfaces as based on knowledge of
Multicast Session activity on the subscriber side
interface and the rules defined in the DOCSIS RFI
specification. In active mode, the device terminates
at and initiates IGMP through its interfaces as based
on the knowledge of Multicast Session activity on the
subscriber side interface."
REFERENCE
"DOCSIS RFI 1.1 Specification, Section 3.3.1. and
DOCSIS RFI 2.0 Specification, Section 5.3.1."
DEFVAL { passive }
::= { docsDevBase 6 }
docsDevMaxCpe OBJECT-TYPE
SYNTAX Unsigned32 (0..255)
UNITS "CPEs"
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The maximum number of CPEs that can be granted access
through a CM during a CM epoch. This value can be
obtained from the CM configuration file; however,
it may be adjusted by the CM according to hardware or
software limitations that have been imposed on the
implementation."
REFERENCE
"DOCSIS RFI 1.0 Specification, Appendix C.7.20., and
DOCSIS RFI 1.1 Specification, Appendix C.1.1.7. and
DOCSIS RFI 2.0 Specification, Appendix C.1.1.7."
::= { docsDevBase 7 }
--
-- The following table provides one level of security for access
-- to the device by network management stations.
-- Note that access is also constrained by the
-- community strings and any vendor-specific security.
--
docsDevNmAccessTable OBJECT-TYPE
SYNTAX SEQUENCE OF DocsDevNmAccessEntry
MAX-ACCESS not-accessible
STATUS deprecated
DESCRIPTION
"This table controls access to SNMP objects by network
management stations. If the table is empty, access to
SNMP objects is unrestricted. The objects in this table
MUST NOT persist across reboots. The objects in this
table are only accessible from cable devices that are
not capable of operating in SNMP Coexistence mode
(RFC 3584) or in SNMPv3 mode (RFC 3410).
See the conformance section for
details. Note that some devices are required by other
specifications (e.g., the DOCSIS OSSIv1.1 specification)
to support the legacy SNMPv1/v2c docsDevNmAccess mode
for backward compatibility.
This table is deprecated. Instead, use the SNMP
coexistence MIBs from RFC 3584, the TARGET and
NOTIFICATION MIBs from RFC 3413, and
the View-Based Access Control Model (VACM) MIBs for
all SNMP protocol versions from RFC 3415."
::= { docsDevMIBObjects 2 }
docsDevNmAccessEntry OBJECT-TYPE
SYNTAX DocsDevNmAccessEntry
MAX-ACCESS not-accessible
STATUS deprecated
DESCRIPTION
"An entry describing access to SNMP objects by a
particular network management station. An entry in
this table is not readable unless the management station
has read-write permission (either implicit if the table
is empty, or explicit through an entry in this table).
Entries are ordered by docsDevNmAccessIndex. The first
matching entry (e.g., matching IP address and community
string) is used to derive access."
INDEX { docsDevNmAccessIndex }
::= { docsDevNmAccessTable 1 }
DocsDevNmAccessEntry ::= SEQUENCE {
docsDevNmAccessIndex Integer32,
docsDevNmAccessIp IpAddress,
docsDevNmAccessIpMask IpAddress,
docsDevNmAccessCommunity OCTET STRING,
docsDevNmAccessControl INTEGER,
docsDevNmAccessInterfaces OCTET STRING,
docsDevNmAccessStatus RowStatus,
docsDevNmAccessTrapVersion INTEGER
}
docsDevNmAccessIndex OBJECT-TYPE
SYNTAX Integer32 (1..2147483647)
MAX-ACCESS not-accessible
STATUS deprecated
DESCRIPTION
"Index used to order the application of access
entries."
::= { docsDevNmAccessEntry 1 }
docsDevNmAccessIp OBJECT-TYPE
SYNTAX IpAddress
MAX-ACCESS read-create
STATUS deprecated
DESCRIPTION
"The IP address (or subnet) of the network management
station. The address 0.0.0.0 is defined to mean
any Network Management Station (NMS). If traps are
enabled for this entry, then the value must be the
address of a specific device. Implementations MAY
recognize 255.255.255.255 as equivalent to 0.0.0.0."
DEFVAL { '00000000'h }
::= { docsDevNmAccessEntry 2 }
docsDevNmAccessIpMask OBJECT-TYPE
SYNTAX IpAddress
MAX-ACCESS read-create
STATUS deprecated
DESCRIPTION
"The IP subnet mask of the network management stations.
If traps are enabled for this entry, then the value must
be 0.0.0.0. Implementations MAY recognize
255.255.255.255 as equivalent to 0.0.0.0."
DEFVAL { '00000000'h }
::= { docsDevNmAccessEntry 3 }
docsDevNmAccessCommunity OBJECT-TYPE
SYNTAX OCTET STRING
MAX-ACCESS read-create
STATUS deprecated
DESCRIPTION
"The community string to be matched for access by this
entry. If set to a zero-length string, then any
community string will match. When read, this object
SHOULD return a zero-length string."
DEFVAL { "public" }
::= { docsDevNmAccessEntry 4 }
docsDevNmAccessControl OBJECT-TYPE
SYNTAX INTEGER {
none(1),
read(2),
readWrite(3),
roWithTraps(4),
rwWithTraps(5),
trapsOnly(6)
}
MAX-ACCESS read-create
STATUS deprecated
DESCRIPTION
"Specifies the type of access allowed to this NMS.
Setting this object to none(1) causes the table entry
to be destroyed. Read(2) allows access by 'get' and
'get-next' PDUs. ReadWrite(3) allows access by 'set' as
well. RoWithtraps(4), rwWithTraps(5), and trapsOnly(6)
control distribution of Trap PDUs transmitted by this
device."
DEFVAL { read }
::= { docsDevNmAccessEntry 5 }
-- The syntax of the following object was copied from RFC 1493,
-- dot1dStaticAllowedToGoTo.okay bestie, so this chunk is where the device's basic settings live 🎀 docsDevRole tells you what the box is: cm(1) for a cable modem, cmtsActive(2) for the CMTS that's running the show, or cmtsBackup(3), which DOCSIS doesn't actually support yet, so it's just there "for completeness" 🦋
docsDevDateTime is giving time travel 🧚 If the device can't figure out the real date, it counts up from the 1970-1-1 epoch since boot. Like, 3 minutes up means it shows 1970-1-1,0:03:0.0. Iconic, honestly 💀
docsDevResetNow is the big red button 🔥 Set it to true(1) and the device resets. Reading it always gives you false(2), so it never looks like it's about to explode 🙈
docsDevSTPControl is about spanning tree vs. bridge PDUs 🌸 The default is noStFilterBpdu(2), and that one is the bit that's required, so every device has to support it 💅
docsDevIgmpModeControl decides if the box is passive(1), forwarding IGMP like a good little bridge, or active(2), where it actually terminates and starts its own IGMP 💖 Passive is the default ✨
docsDevMaxCpe caps how many CPEs can get access through a CM in one epoch 👑 It comes from the config file, but the CM can lower it if its hardware or software says so 🫶
Now the security bit, and it's a whole thing 😭 The docsDevNmAccessTable MUST NOT persist across reboots 💀 It's also only for cable devices that can't do SNMP Coexistence mode (RFC 3584) or SNMPv3 mode (RFC 3410), and it's been deprecated, so use RFC 3584, RFC 3413 and RFC 3415 instead 🙅♀️
Every row of the table is an access rule. Empty table means everything is open to SNMP, which is wild ngl 🙈 The first matching entry (by IP and community string) is the one that counts, and entries get sorted by docsDevNmAccessIndex 🍓
docsDevNmAccessIp is the NMS address, where 0.0.0.0 means any NMS. If traps are on, it has to be one specific device 🦋 Implementations MAY treat 255.255.255.255 the same as 0.0.0.0 🌈
docsDevNmAccessIpMask is the subnet mask for those stations, and if traps are enabled it MUST be 0.0.0.0 💖 Same deal, implementations MAY treat 255.255.255.255 as 0.0.0.0 ✨
docsDevNmAccessCommunity is the community string to match, and a zero-length string matches anything 🧚 When you read it back, it SHOULD return a zero-length string 🫶
docsDevNmAccessControl is the access level: none(1) deletes the row, read(2) gets you get and get-next, readWrite(3) adds set, and the trap-related ones (roWithTraps(4), rwWithTraps(5), trapsOnly(6)) control where Trap PDUs go 🎀
okay bestie, we're still in the NMS access table, and this bit is giving "old but iconic" 🦋 the interfaces object is bit-mapped, so each octet covers eight interfaces, and the most significant bit is the lowest numbered one 🧠✨
docsDevNmAccessInterfaces OBJECT-TYPE
SYNTAX OCTET STRING (SIZE (1..32))
MAX-ACCESS read-create
STATUS deprecated
DESCRIPTION
"Specifies the set of interfaces from which requests from
this NMS will be accepted. Each octet within
the value of this object specifies a set of eight
interfaces, the first octet specifying ports 1
through 8, the second octet specifying interfaces 9
through 16, etc. Within each octet, the most
significant bit represents the lowest numbered
interface, and the least significant bit represents the
highest numbered interface. Thus, each interface is
represented by a single bit within the value of this
object. If that bit has a value of '1' then that
interface is included in the set.
Note that entries in this table apply only to link-layer
interfaces (e.g., Ethernet and CATV MAC). Bits
representing upstream and downstream channel interfaces
MUST NOT be set to '1'.
Note that if bits corresponding to non-existing
interfaces are set, the result is implementation
specific.
Note that according to the DOCSIS OSSIv1.1
specification, when ifIndex '1' is included in the
set, then this row applies to all CPE
(customer-facing) interfaces.
The size of this object is the minimum required to
represent all configured interfaces for this device."
::= { docsDevNmAccessEntry 6 }
docsDevNmAccessStatus OBJECT-TYPE
SYNTAX RowStatus
MAX-ACCESS read-create
STATUS deprecated
DESCRIPTION
"Controls and reflects the status of rows in this
table. Rows in this table may be created by either the
create-and-go or create-and-wait paradigm. There is no
restriction on changing values in a row of this table
while the row is active.
The following objects MUST have valid values before this
object can be set to active: docsDevNmAccessIp,
docsDevNmAccessStatus, docsDevNmAccessIpMask,
docsDevNmAccessCommunity, docsDevNmAccessControl, and
docsDevNmAccessInterfaces."
::= { docsDevNmAccessEntry 7 }
docsDevNmAccessTrapVersion OBJECT-TYPE
SYNTAX INTEGER {
disableSNMPv2trap(1),
enableSNMPv2trap(2)
}
MAX-ACCESS read-create
STATUS deprecated
DESCRIPTION
"Specifies the TRAP version that is sent to this NMS.
Setting this object to disableSNMPv2trap (1) causes the
trap in SNMPv1 format to be sent to a particular NMS.
Setting this object to enableSNMPv2trap (2) causes the
trap in SNMPv2 format be sent to a particular NMS."
DEFVAL { disableSNMPv2trap }
::= { docsDevNmAccessEntry 8 }
--
-- The following group describes control objects used for downloading
-- firmware to a cable device. Procedures for software download are
-- described in Section 3.2.1 of the RFC containing this MIB module.
--
docsDevSoftware OBJECT IDENTIFIER ::= { docsDevMIBObjects 3 }
docsDevSwServer OBJECT-TYPE
SYNTAX IpAddress
MAX-ACCESS read-write
STATUS deprecated
DESCRIPTION
"The address of the TFTP server used for software
upgrades. If the TFTP server is unknown or is a
non-IPv4 address, return 0.0.0.0.
This object is deprecated. See docsDevSwServerAddress
for its replacement. This object will have its value
modified, given a valid SET to docsDevSwServerAddress."
::= { docsDevSoftware 1 }
docsDevSwFilename OBJECT-TYPE
SYNTAX SnmpAdminString (SIZE (0..64))
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"The filename of the software image to be downloaded via
TFTP, or the abs_path (as defined in RFC 2616) of the
software image to be downloaded via HTTP.
Unless set via SNMP, this is the filename or abs_path
specified by the provisioning server during the boot
process that corresponds to the software version that
is desired for this device.
If unknown, the value of this object is the zero-length
string."
::= { docsDevSoftware 2 }
docsDevSwAdminStatus OBJECT-TYPE
SYNTAX INTEGER {
upgradeFromMgt(1),
allowProvisioningUpgrade(2),
ignoreProvisioningUpgrade(3)
}
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"If set to upgradeFromMgt(1), the device will initiate a
TFTP or HTTP software image download. After
successfully receiving an image, the device will set
its state to ignoreProvisioningUpgrade(3) and reboot.
If the download process is interrupted (e.g., by a reset
or power failure), the device will load the previous
image and, after re-initialization, continue to attempt
loading the image specified in docsDevSwFilename.
If set to allowProvisioningUpgrade(2), the device will
use the software version information supplied by the
provisioning server when next rebooting (this does not
cause a reboot).
When set to ignoreProvisioningUpgrade(3), the device
will disregard software image upgrade information
from the provisioning server.
Note that reading this object can return
upgradeFromMgt(1). This indicates that a software
download is currently in progress, and that the device
will reboot after successfully receiving an image."
DEFVAL { allowProvisioningUpgrade }
::= { docsDevSoftware 3 }
docsDevSwOperStatus OBJECT-TYPE
SYNTAX INTEGER {
inProgress(1),
completeFromProvisioning(2),
completeFromMgt(3),
failed(4),
other(5)
}
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"InProgress(1) indicates that a TFTP or HTTP download is
underway, either as a result of a version mismatch at
provisioning or as a result of a upgradeFromMgt request.
No other docsDevSw* objects can be modified in
this state.
CompleteFromProvisioning(2) indicates that the last
software upgrade was a result of version mismatch at
provisioning.
CompleteFromMgt(3) indicates that the last software
upgrade was a result of setting docsDevSwAdminStatus to
upgradeFromMgt.
Failed(4) indicates that the last attempted download
failed, ordinarily due to TFTP or HTTP timeout."
REFERENCE
"DOCSIS RFI 1.0 Specification, Section 8.2., and
DOCSIS RFI 1.1 Specification, Section 10.1. and
DOCSIS RFI 2.0 Specification, Section 12.1."
::= { docsDevSoftware 4 }
docsDevSwCurrentVers OBJECT-TYPE
SYNTAX SnmpAdminString
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The software version currently operating in this device.
This string's syntax is that used by the
individual vendor to identify software versions.
For a CM, this string will describe the current
software load. For a CMTS, this object SHOULD contain
a human-readable representation either of the vendor
specific designation of the software for the chassis,
or of the software for the control processor. If
neither of these is applicable, the value MUST be a
zero-length string."
::= { docsDevSoftware 5 }
docsDevSwServerAddressType OBJECT-TYPE
SYNTAX InetAddressType
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"The type of address of the TFTP or HTTP server used for
software upgrades.
If docsDevSwServerTransportProtocol is currently set to
tftp(1), attempting to set this object to dns(16) MUST
result in an error."
::= { docsDevSoftware 6 }
docsDevSwServerAddress OBJECT-TYPE
SYNTAX InetAddress
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"The address of the TFTP or HTTP server used for software
upgrades.
If the TFTP/HTTP server is unknown, return the zero-
length address string (see the TextualConvention).
If docsDevSwServer is also implemented in this agent,
this object is tied to it. A set of this object to an
IPv4 address will result in also setting the value of
docsDevSwServer to that address. If this object is set
to an IPv6 address, docsDevSwServer is set to 0.0.0.0.
If docsDevSwServer is set, this object is also set to
that value. Note that if both are set in the same
action, the order of which one sets the other is
undefined."
::= { docsDevSoftware 7 }
docsDevSwServerTransportProtocol OBJECT-TYPE
SYNTAX INTEGER {
tftp(1),
http(2)
}
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"This object specifies the transport protocol (TFTP or
HTTP) to be used for software upgrades.
If the value of this object is tftp(1), then the cable
device uses TFTP (RFC 1350) read request packets to
download the docsDevSwFilename from the
docsDevSwServerAddress in octet mode.
If the value of this object is http(2), then the cable
device uses HTTP 1.0 (RFC 1945) or HTTP 1.1 (RFC 2616)
GET requests sent to host docsDevSwServerAddress to
download the software image from path docsDevSwFilename.
If docsDevSwServerAddressType is currently set to
dns(16), attempting to set this object to tftp(1) MUST
result in an error."
DEFVAL { tftp }
::= { docsDevSoftware 8 }
--
-- The following group describes server access and parameters used
-- for initial provisioning and bootstrapping.
--
docsDevServer OBJECT IDENTIFIER ::= { docsDevMIBObjects 4 }the software group is where the upgrade drama lives 📦💜 the admin status, the oper status and the server settings all have to agree with each other, so read those descriptions slowly 🫶
okay bestie, let's get into the boot-state and server-address objects 🎀 and then the event-reporting stuff (the throttling is giving whole main character energy 💅).
docsDevServerBootState OBJECT-TYPE
SYNTAX INTEGER {
operational(1),
disabled(2),
waitingForDhcpOffer(3),
waitingForDhcpResponse(4),
waitingForTimeServer(5),
waitingForTftp(6),
refusedByCmts(7),
forwardingDenied(8),
other(9),
unknown(10)
}
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"If operational(1), the device has completed loading and
processing of configuration parameters, and the CMTS has
completed the Registration exchange.
If disabled(2), then the device was administratively
disabled, possibly by being refused network access in
the configuration file.
If waitingForDhcpOffer(3), then a Dynamic Host
Configuration Protocol (DHCP) Discover has been
transmitted, and no offer has yet been received.
If waitingForDhcpResponse(4), then a DHCP Request has
been transmitted, and no response has yet been received.
If waitingForTimeServer(5), then a Time Request has been
transmitted, and no response has yet been received.
If waitingForTftp(6), then a request to the TFTP
parameter server has been made, and no response
received.
If refusedByCmts(7), then the Registration
Request/Response exchange with the CMTS failed.
If forwardingDenied(8), then the registration process
was completed, but the network access option in the
received configuration file prohibits forwarding.
If other(9), then the registration process reached a
point that does not fall into one of the above
categories.
If unknown(10), then the device has not yet begun the
registration process or is in some other indeterminate
state."
REFERENCE
"DOCSIS RFI 1.0 Specification, Figure 7-1, and
DOCSIS RFI 1.1 Specification, Figure 9-1 and
DOCSIS RFI 2.0 Specification, Figure 11-1."
::= { docsDevServer 1 }
docsDevServerDhcp OBJECT-TYPE
SYNTAX IpAddress
MAX-ACCESS read-only
STATUS deprecated
DESCRIPTION
"The IP address of the DHCP server that assigned an IP
address to this device. Returns 0.0.0.0 if DHCP is not
used for IP address assignment, or if this agent is
not assigned an IPv4 address.
This object is deprecated and is replaced by
docsDevServerDhcpAddress."
::= { docsDevServer 2 }
docsDevServerTime OBJECT-TYPE
SYNTAX IpAddress
MAX-ACCESS read-only
STATUS deprecated
DESCRIPTION
"The IP address of the Time server (RFC 0868). Returns
0.0.0.0 if the time server IP address is unknown, or if
the time server is not an IPv4 server.
This object is deprecated and is replaced by
docsDevServerTimeAddress."
::= { docsDevServer 3 }
docsDevServerTftp OBJECT-TYPE
SYNTAX IpAddress
MAX-ACCESS read-only
STATUS deprecated
DESCRIPTION
"The IP address of the TFTP server responsible for
downloading provisioning and configuration parameters
to this device. Returns 0.0.0.0 if the TFTP server
address is unknown or is not an IPv4 address.
This object is deprecated and is replaced by
docsDevServerConfigTftpAddress."
::= { docsDevServer 4 }
docsDevServerConfigFile OBJECT-TYPE
SYNTAX SnmpAdminString
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The name of the device configuration file read from
the TFTP server. Returns a zero-length string if
the configuration file name is unknown."
::= { docsDevServer 5 }
docsDevServerDhcpAddressType OBJECT-TYPE
SYNTAX InetAddressType
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The type of address of docsDevServerDhcpAddress. If
DHCP was not used, this value should return
unknown(0)."
::= { docsDevServer 6 }
docsDevServerDhcpAddress OBJECT-TYPE
SYNTAX InetAddress
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The internet address of the DHCP server that assigned
an IP address to this device. Returns the zero length
octet string if DHCP was not used for IP address
assignment."
::= { docsDevServer 7 }
docsDevServerTimeAddressType OBJECT-TYPE
SYNTAX InetAddressType
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The type of address of docsDevServerTimeAddress. If
no time server exists, this value should return
unknown(0)."
::= { docsDevServer 8 }
docsDevServerTimeAddress OBJECT-TYPE
SYNTAX InetAddress
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The Internet address of the RFC 868 Time server,
as provided by DHCP option 4.
Note that if multiple values are provided to the
CM in DHCP option 4, the value of this MIB object
MUST be the Time server address from which the Time
of Day reference was acquired as based on the DOCSIS
RFI specification. During the period of time where
the Time of Day have not been acquired, the Time
server address reported by the CM may report the
first address value in the DHCP option value or the
last server address the CM attempted to get the Time
of day value.
Returns the zero-length octet string if the time server
IP address is not provisioned."
REFERENCE
"DOCSIS RFI 1.1 Specification, Section 9.2.7. and
DOCSIS RFI 2.0 Specification, Section 11.2.7."
::= { docsDevServer 9 }
docsDevServerConfigTftpAddressType OBJECT-TYPE
SYNTAX InetAddressType
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The type of address of docsDevServerConfigTftpAddress.
If no TFTP server exists, this value should return
unknown(0)."
::= { docsDevServer 10 }
docsDevServerConfigTftpAddress OBJECT-TYPE
SYNTAX InetAddress
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The internet address of the TFTP server responsible for
downloading provisioning and configuration parameters
to this device. Returns the zero-length octet string if
the config server address is unknown. There are certain
security risks that are involved with using TFTP."
REFERENCE
"RFC 3617, Section 5"
::= { docsDevServer 11 }
--
-- Event Reporting
--
docsDevEvent OBJECT IDENTIFIER ::= { docsDevMIBObjects 5 }
docsDevEvControl OBJECT-TYPE
SYNTAX INTEGER {
resetLog(1),
useDefaultReporting(2)
}
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"Setting this object to resetLog(1) empties the event
log. All data is deleted. Setting it to
useDefaultReporting(2) returns all event priorities to
their factory-default reporting. Reading this object
always returns useDefaultReporting(2)."
::= { docsDevEvent 1 }
docsDevEvSyslog OBJECT-TYPE
SYNTAX IpAddress
MAX-ACCESS read-write
STATUS deprecated
DESCRIPTION
"The IP address of the Syslog server. If 0.0.0.0, either
syslog transmission is inhibited, or the Syslog server
address is not an IPv4 address.
This object is deprecated and is replaced by
docsDevEvSyslogAddress."
::= { docsDevEvent 2 }
docsDevEvThrottleAdminStatus OBJECT-TYPE
SYNTAX INTEGER {
unconstrained(1),
maintainBelowThreshold(2),
stopAtThreshold(3),
inhibited(4)
}
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"Controls the transmission of traps and syslog messages
with respect to the trap pacing threshold.
unconstrained(1) causes traps and syslog messages to be
transmitted without regard to the threshold settings.
maintainBelowThreshold(2) causes trap transmission and
syslog messages to be suppressed if the number of traps
would otherwise exceed the threshold.
stopAtThreshold(3) causes trap transmission to cease at
the threshold and not to resume until directed to do so.
inhibited(4) causes all trap transmission and syslog
messages to be suppressed.
A single event is always treated as a single event for
threshold counting. That is, an event causing both a
trap and a syslog message is still treated as a single
event.
Writing to this object resets the thresholding state."
DEFVAL { unconstrained }
::= { docsDevEvent 3 }
docsDevEvThrottleInhibited OBJECT-TYPE
SYNTAX TruthValue
MAX-ACCESS read-only
STATUS deprecated
DESCRIPTION
"If true(1), trap and syslog transmission is currently
inhibited due to thresholds and/or the current setting
of docsDevEvThrottleAdminStatus. In addition, this is
true(1) when transmission is inhibited because no
syslog (docsDevEvSyslog) or trap (docsDevNmAccessEntry)
destinations have been set.
This object is deprecated and is replaced by
docsDevEvThrottleThresholdExceeded."
::= { docsDevEvent 4 }
docsDevEvThrottleThreshold OBJECT-TYPE
SYNTAX Unsigned32
UNITS "events"
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"Number of events per docsDevEvThrottleInterval permitted
before throttling is to occur.
A single event, whether the notification could result in
messages transmitted using syslog, SNMP, or both
protocols, and regardless of the number of destinations,
(including zero) is always treated as a single event for
threshold counting. For example, an event causing both
a trap and a syslog message is still treated as a single
event.So the throttle threshold counts every system notification that happens on the device, not just the spicy ones 💅
All system notifications that occur within the device
should be taken into consideration when calculating
and monitoring the threshold."
DEFVAL { 0 }
::= { docsDevEvent 5 }
docsDevEvThrottleInterval OBJECT-TYPE
SYNTAX Integer32 (1..2147483647)
UNITS "seconds"
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"The interval over which docsDevEvThrottleThreshold
applies."
DEFVAL { 1 }
::= { docsDevEvent 6 }
--
-- The following table controls the reporting of the various classes
-- of events.
--
docsDevEvControlTable OBJECT-TYPE
SYNTAX SEQUENCE OF DocsDevEvControlEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This table allows control of the reporting of event
classes. For each event priority, a combination of
logging and reporting mechanisms may be chosen. The
mapping of event types to priorities is
vendor dependent. Vendors may also choose to allow
the user to control that mapping through proprietary
means. Table entries MUST persist across reboots for
CMTS devices and MUST NOT persist across reboots for CM
devices."
::= { docsDevEvent 7 }
docsDevEvControlEntry OBJECT-TYPE
SYNTAX DocsDevEvControlEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Allows configuration of the reporting mechanisms for a
particular event priority."
INDEX { docsDevEvPriority }
::= { docsDevEvControlTable 1 }
DocsDevEvControlEntry ::= SEQUENCE {
docsDevEvPriority INTEGER,
docsDevEvReporting BITS
}Okay, the control table is where the vibe gets organized 🗂️✨ Each event priority gets its own row, and the table entries MUST persist across reboots for CMTS devices and MUST NOT persist across reboots for CM devices 🫶 Yes, the CMTS and the CM are treated differently here, and that's not a typo 🙈
Next up is the priority object. Lowkey the most important bit of this whole section 👑
docsDevEvPriority OBJECT-TYPE
SYNTAX INTEGER {
emergency(1),
alert(2),
critical(3),
error(4),
warning(5),
notice(6),
information(7),
debug(8)
}
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The priority level that is controlled by this
entry. These are ordered from most (emergency) to least
(debug) critical. Each event with a CM or CMTS has a
particular priority level associated with it (as defined
by the vendor).
emergency(1) events indicate vendor-specific fatal
hardware or software errors that prevent normal system
operation.
alert(2) events indicate a serious failure that causes
the reporting system to reboot but is not caused by
hardware or software malfunctioning.
critical(3) events indicate a serious failure that
requires attention and prevents the device from
transmitting data but that could be recovered without
rebooting the system.
error(4) and warning(5) events indicate that a failure
occurred that could interrupt the normal data flow but
that does not cause the device to re-register.
notice(6) and information(7) events indicate a
milestone or checkpoint in normal operation that could
be of particular importance for troubleshooting.
debug(8) events are reserved for vendor-specific
events.
During normal operation, no event more
critical than notice(6) should be generated. Events
between warning and emergency should be generated at
appropriate levels of problems (e.g., emergency when the
box is about to crash)."
::= { docsDevEvControlEntry 1 }The levels go from most serious (emergency) down to least (debug) 🔥 Just remember that during normal operation, nothing more serious than notice(6) should be generated. Emergency is for when the box is literally about to crash 💀
Now the reporting bits. These are the actual "what do I do" knobs 🎀
docsDevEvReporting OBJECT-TYPE
SYNTAX BITS {
local(0),
traps(1),
syslog(2),
-- The following are extensions to the original set of
-- labels. The extensions start at an octet boundary.
-- So for bits 3 - 7, one MUST set them to zero on send
-- and one MUST ignore them on receipt.
localVolatile(8),
stdInterface(9)
}
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"Defines the action to be taken on occurrence of this
event class. Implementations may not necessarily
support all options for all event classes but at
minimum must allow traps and syslogging to be
disabled.
If the local(0) bit is set, then log to the internal
log and update non-volatile store, for backward
compatibility with the original RFC 2669 definition.
If the traps(1) bit is set, then generate
an SNMP trap; if the syslog(2) bit is set, then
send a syslog message (assuming that the syslog address
is set). If the localVolatile(8) bit is set, then
log to the internal log without updating non-volatile
store. If the stdInterface(9) bit is set, then the
agent ignores all other bits except the local(0),
syslog(2), and localVolatile(8) bits. Setting the
stdInterface(9) bit indicates that RFC3413 and
RFC3014 are being used to control event reporting
mechanisms."
::= { docsDevEvControlEntry 2 }Quick heads-up on the bit layout 🦋 The comment says bits 3 through 7 are zeroed on send and ignored on receipt, and that rule is a MUST for both sides 🙈 Also, the bits 8 and 9 are the newer extensions that start at the octet boundary.
Now the event log itself, the big diary of what went wrong 📓
docsDevEventTable OBJECT-TYPE
SYNTAX SEQUENCE OF DocsDevEventEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Contains a log of network and device events that may be
of interest in fault isolation and troubleshooting.
If the local(0) bit is set in docsDevEvReporting,
entries in this table MUST persist across reboots."
::= { docsDevEvent 8 }
docsDevEventEntry OBJECT-TYPE
SYNTAX DocsDevEventEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Describes a network or device event that may be of
interest in fault isolation and troubleshooting.
Multiple sequential identical events are represented by
incrementing docsDevEvCounts and setting
docsDevEvLastTime to the current time rather than
creating multiple rows.
Entries are created with the first occurrence of an
event. docsDevEvControl can be used to clear the
table. Individual events cannot be deleted."
INDEX { docsDevEvIndex }
::= { docsDevEventTable 1 }
DocsDevEventEntry ::= SEQUENCE {
docsDevEvIndex Integer32,
docsDevEvFirstTime DateAndTime,
docsDevEvLastTime DateAndTime,
docsDevEvCounts Counter32,
docsDevEvLevel INTEGER,
docsDevEvId Unsigned32,
docsDevEvText SnmpAdminString
}Okay so if the local(0) bit is set, the entries in this table MUST persist across reboots 💾 Also, repeat events don't spam new rows. They just bump docsDevEvCounts and update the last-seen time ⏰ Super efficient, very giving 🧚
Next are the index and time objects 🌸
docsDevEvIndex OBJECT-TYPE
SYNTAX Integer32 (1..2147483647)
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Provides relative ordering of the objects in the event
log. This object will always increase except when
(a) the log is reset via docsDevEvControl,
(b) the device reboots and does not implement
non-volatile storage for this log, or (c) it reaches
the value 2^31. The next entry for all the above
cases is 1."
::= { docsDevEventEntry 1 }
docsDevEvFirstTime OBJECT-TYPE
SYNTAX DateAndTime
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The value of docsDevDateTime at the time this entry was
created."
::= { docsDevEventEntry 2 }
docsDevEvLastTime OBJECT-TYPE
SYNTAX DateAndTime
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"When an entry reports only one event, this object will
have the same value as the corresponding instance of
docsDevEvFirstTime. When an entry reports multiple
events, this object will record the value that
docsDevDateTime had when the most recent event for this
entry occurred."
::= { docsDevEventEntry 3 }
-- This object was renamed from docsDevEvCount to meet naming
-- requirements for Counter32
docsDevEvCounts OBJECT-TYPE
SYNTAX Counter32
UNITS "events"
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of consecutive event instances reported by
this entry. This starts at 1 with the creation of this
row and increments by 1 for each subsequent duplicate
event."
::= { docsDevEventEntry 4 }The index is basically the event log's ordering system 🔢 It only goes back to 1 in a few specific cases: a log reset through docsDevEvControl, a reboot when there's no non-volatile storage for the log, or when it hits 2^31. Also, docsDevEvCounts starts at 1 and ticks up for each duplicate ✨
Last up in this part is the level object, which mirrors the priority list 🌈
docsDevEvLevel OBJECT-TYPE
SYNTAX INTEGER {
emergency(1),
alert(2),
critical(3),
error(4),
warning(5),
notice(6),
information(7),
debug(8)
}
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The priority level of this event, as defined by the
vendor. These are ordered from most serious (emergency)
to least serious (debug).
emergency(1) events indicate vendor-specific fatal
hardware or software errors that prevent normal system
operation.
alert(2) events indicate a serious failure that causes
the reporting system to reboot but that is not caused by
hardware or software malfunctioning.
critical(3) events indicate a serious failure that
requires attention and prevents the device from
transmitting data but that could be recovered without
rebooting the system.
error(4) and warning(5) events indicate that a failure
occurred that could interrupt the normal data flow but
that does not cause the device to re-register.
notice(6) and information(7) events indicate a
milestone or checkpoint in normal operation that could
be of particular importance for troubleshooting.
debug(8) events are reserved for vendor-specific
events.
During normal operation, no event more
critical than notice(6) should be generated. Events
between warning and emergency should be generated at
appropriate levels of problems (e.g., emergency when the
box is about to crash)."
::= { docsDevEventEntry 5 }
--
-- It is strongly recommended that implementors follow the CableLabs
-- enumerations for docsDevEvId, per the DOCSIS OSSIv1.1 spec
-- and follow-on specifications.
--The docsDevEvId enumerations are the part where the CableLabs list is strongly recommended 🫶 That's the vibe for this chunk, and the next part picks up the story from right here 🎀
okay so we're deep in the MIB now and it's giving object definitions everywhere 💅 these are the actual knobs and switches for event reporting and filtering, so every detail matters bestie 🎀
docsDevEvId OBJECT-TYPE
SYNTAX Unsigned32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"For this product, uniquely identifies the type of event
that is reported by this entry."
REFERENCE
"DOCSIS OSSI 1.1 Specification, Appendix H and
DOCSIS OSSI 2.0 Specification, Annex D."
::= { docsDevEventEntry 6 }
docsDevEvText OBJECT-TYPE
SYNTAX SnmpAdminString
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Provides a human-readable description of the event,
including all relevant context (interface numbers,
etc.)."
::= { docsDevEventEntry 7 }so docsDevEvId is the read-only event type ID (an Unsigned32) and docsDevEvText is the readable description of the event, with all the juicy context like interface numbers 🦋
docsDevEvSyslogAddressType OBJECT-TYPE
SYNTAX InetAddressType
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"The type of address of docsDevEvSyslogAddress. If
no syslog server exists, this value should return
unknown(0)."
DEFVAL { unknown }
::= { docsDevEvent 9 }
docsDevEvSyslogAddress OBJECT-TYPE
SYNTAX InetAddress
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"The Internet address of the Syslog server, as provided
by DHCP option 7 or set via SNMP management. If the
address of the server is set to the zero-length
string, the 0.0.0.0 IPv4 address, or the 0: IPv6
address, Syslog transmission is inhibited.
Note that if multiple values are provided to the CM in
DHCP option 7, the value of this MIB object MUST be the
first Syslog server address received.
By default at agent boot, this object returns the zero
length string."
::= { docsDevEvent 10 }ngl the syslog pair is so specific 🙈 docsDevEvSyslogAddressType tells you what kind of address you're holding, and it's unknown(0) when there's no syslog server. docsDevEvSyslogAddress is the server address, either from DHCP option 7 or set over SNMP. Setting it to the zero-length string, 0.0.0.0, or 0: for IPv6 turns syslog transmission off completely. If DHCP hands over several values, this object has to hold the first syslog server address received, and at boot it comes back as the zero-length string. no notes, just facts 🌸
docsDevEvThrottleThresholdExceeded OBJECT-TYPE
SYNTAX TruthValue
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"If true(1), trap and syslog transmission is currently
inhibited due to exceeding the trap/syslog event
threshold in the current interval."
::= { docsDevEvent 11 }this one is the throttle alarm 🚨 when it reads true(1), trap and syslog transmission is paused because the event threshold for the current interval got exceeded. it's basically the "slow down, we're too chatty" light ✨
--
-- Link Level Control Filtering
--
docsDevFilter OBJECT IDENTIFIER ::= { docsDevMIBObjects 6 }
docsDevFilterLLCUnmatchedAction OBJECT-TYPE
SYNTAX INTEGER {
discard(1),
accept(2)
}
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"LLC (Link Level Control) filters can be defined on an
inclusive or exclusive basis: CMs can be configured to
forward only packets matching a set of layer three
protocols, or to drop packets matching a set of layer
three protocols. Typical use of these filters is to
filter out possibly harmful (given the context of a
large metropolitan LAN) protocols.
If set to discard(1), any L2 packet that does not match
at least one filter in the docsDevFilterLLCTable will be
discarded. If set to accept(2), any L2 packet that
does not match at least one filter in the
docsDevFilterLLCTable will be accepted for further
processing (e.g., bridging). In other words, if the
packet does not match an entry in the table, it takes
this action; if it does match an entry in the table, it
takes the opposite of this action."
DEFVAL { accept }
::= { docsDevFilter 1 }okay the LLC filter section is where the vibes get serious 💀 LLC filters can be inclusive or exclusive. CMs can forward only packets matching a set of layer three protocols, or drop packets matching a set of them. the typical use is filtering out protocols that could be harmful on a big metro LAN 🌈
docsDevFilterLLCUnmatchedAction is the default move for packets that don't match any entry. discard(1) tosses them, accept(2) lets them go on to further processing like bridging. if a packet does match a table entry, it gets the opposite of that action. the default is accept(2) 🎀
docsDevFilterLLCTable OBJECT-TYPE
SYNTAX SEQUENCE OF DocsDevFilterLLCEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A list of filters to apply to (bridged) LLC
traffic. The filters in this table are applied to
incoming traffic on the appropriate interface(s) prior
to any further processing (e.g., before the packet
is handed off for level 3 processing, or for bridging).
The specific action taken when no filter is matched is
controlled by docsDevFilterLLCUnmatchedAction. Table
entries MUST NOT persist across reboots for any device."
::= { docsDevFilter 2 }
docsDevFilterLLCEntry OBJECT-TYPE
SYNTAX DocsDevFilterLLCEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Describes a single filter to apply to (bridged) LLC
traffic received on a specified interface. "
INDEX { docsDevFilterLLCIndex }
::= { docsDevFilterLLCTable 1 }
DocsDevFilterLLCEntry ::= SEQUENCE {
docsDevFilterLLCIndex Integer32,
docsDevFilterLLCStatus RowStatus,
docsDevFilterLLCIfIndex InterfaceIndexOrZero,
docsDevFilterLLCProtocolType INTEGER,
docsDevFilterLLCProtocol Integer32,
docsDevFilterLLCMatches Counter32
}the table itself applies filters to incoming (bridged) LLC traffic on the right interfaces before any other processing happens. whatever the unmatched action is gets applied when nothing matches. and the one thing you really need to remember: table entries MUST NOT persist across reboots for any device 🙅♀️ each row is one filter, and the entry has six columns: index, status, interface, protocol type, protocol, and matches 🧚
docsDevFilterLLCIndex OBJECT-TYPE
SYNTAX Integer32 (1..2147483647)
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Index used for the identification of filters (note that
LLC filter order is irrelevant)."
::= { docsDevFilterLLCEntry 1 }
docsDevFilterLLCStatus OBJECT-TYPE
SYNTAX RowStatus
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"Controls and reflects the status of rows in this
table. There is no restriction on changing any of the
associated columns for this row while this object is set
to active.
Specifying only this object (with the
appropriate index) on a CM is sufficient to create a
filter row that matches all inbound packets on the
ethernet interface and results in the packets being
discarded. docsDevFilterLLCIfIndex (at least) must be
specified on a CMTS to create a row."
::= { docsDevFilterLLCEntry 2}the index is just for identifying filters, and the spec is clear that LLC filter order doesn't matter 🦋 the status column controls and reflects the row. on a CM, just setting the status with the right index makes a row that matches all inbound packets on the ethernet interface and discards them. on a CMTS, docsDevFilterLLCIfIndex has to be specified at minimum to create a row ✨
docsDevFilterLLCIfIndex OBJECT-TYPE
SYNTAX InterfaceIndexOrZero
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The entry interface to which this filter applies. The
value corresponds to ifIndex for either a CATV MAC or
another network interface. If the value is zero, the
filter applies to all interfaces. In Cable Modems, the
default value is the customer side interface(s). In
CMTSs, this object has to be specified to
create a row in this table.
Note that according to the DOCSIS OSSIv1.1
specification, ifIndex '1' in the CM means that this
row applies to all Cable Modem-to-CPE Interfaces
(CMCI)."
REFERENCE
"DOCSIS OSSI 1.1 Specification, Section 3.3.4.1. and
DOCSIS OSSI 2.0 Specification, Section 6.3.4.1."
::= { docsDevFilterLLCEntry 3 }
docsDevFilterLLCProtocolType OBJECT-TYPE
SYNTAX INTEGER {
ethertype(1),
dsap(2)
}
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The format of the value in docsDevFilterLLCProtocol:
either a two-byte Ethernet Ethertype, or a one-byte
802.2 Service Access Point (SAP) value. ethertype(1)
also applies to Standard Network Access Protocol
(SNAP) encapsulated frames."
DEFVAL { ethertype }
::= { docsDevFilterLLCEntry 4 }
docsDevFilterLLCProtocol OBJECT-TYPE
SYNTAX Integer32 (0..65535)
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The layer-three protocol for which this filter applies.
The protocol value format depends on
docsDevFilterLLCProtocolType. Note that for SNAP
frames, ethertype filtering is performed rather than
Destination Service Access Point (DSAP) =0xAA."
DEFVAL { 0 }
::= { docsDevFilterLLCEntry 5 }
docsDevFilterLLCMatches OBJECT-TYPE
SYNTAX Counter32
UNITS "matches"
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Counts the number of times this filter was matched."
::= { docsDevFilterLLCEntry 6 }so docsDevFilterLLCIfIndex picks which interface the filter lives on. zero means every interface, and on a CM the default is the customer side. the spec also points out that for CMs, ifIndex '1' means the row covers all CMCIs 🌸 docsDevFilterLLCProtocolType says whether docsDevFilterLLCProtocol is a two-byte Ethertype or a one-byte 802.2 SAP value, with SNAP frames counted under ethertype(1). and for SNAP frames, ethertype filtering happens instead of checking DSAP =0xAA. docsDevFilterLLCMatches just counts how many times the filter got hit 📊
--
-- IPv4 Filtering
--
docsDevFilterIpDefault OBJECT-TYPE
SYNTAX INTEGER {
discard(1),
accept(2)
}
MAX-ACCESS read-write
STATUS deprecated
DESCRIPTION
"The default behavior for (bridged) packets that do not
match IP filters (or Internet filters, if implemented)
is defined by docsDevFilterIpDefault.
If set to discard(1), all packets not matching an IP
filter in docsDevFilterIpTable will be discarded. If
set to accept(2), all packets not matching an IP filter
or an Internet filter will be accepted for further
processing (e.g., bridging)."
DEFVAL { accept }
::= { docsDevFilter 3 }
docsDevFilterIpTable OBJECT-TYPE
SYNTAX SEQUENCE OF DocsDevFilterIpEntry
MAX-ACCESS not-accessible
STATUS deprecated
DESCRIPTION
"An ordered list of filters or classifiers to apply to
IP traffic. Filter application is ordered by the filter
index, rather than by a best match algorithm (note that
this implies that the filter table may have gaps in the
index values). Packets that match no filters will have
policy 0 in the docsDevFilterPolicyTable applied to
them, if it exists. Otherwise, Packets that match no
filters are discarded or forwarded according to the
setting of docsDevFilterIpDefault.
Any IP packet can theoretically match multiple rows of
this table. When considering a packet, the table is
scanned in row index order (e.g., filter 10 is checked
before filter 20). If the packet matches that filter
(which means that it matches ALL criteria for that row),
actions appropriate to docsDevFilterIpControl and
docsDevFilterPolicyId are taken. If the packet was
discarded processing is complete. If
docsDevFilterIpContinue is set to true, the filter
comparison continues with the next row in the table,
looking for additional matches.the IPv4 filtering section is marked deprecated, so heads up 💅 docsDevFilterIpDefault is the default for bridged packets that don't match IP filters, or Internet filters if those are implemented. discard(1) drops anything unmatched and accept(2) lets it through for further processing.
and then the IP filter table, also deprecated 🫶 it's an ordered list where filters get applied by index order, not best match. so filter 10 is checked before filter 20, and gaps in the index values are totally allowed. when a packet hits a filter (meaning it matches ALL criteria for that row), the actions for docsDevFilterIpControl and docsDevFilterPolicyId kick in. if docsDevFilterIpContinue is set to true, the scan keeps going to look for more matches 🔥 and that's where we pause, the rest of this table entry is coming up next 👀
If the packet matches no filter in the table, the packet is accepted or dropped for further processing according to the setting of docsDevFilterIpDefault. If the packet is accepted, the actions specified by policy group 0 (e.g., the rows in docsDevFilterPolicyTable that have a value of 0 for docsDevFilterPolicyId) are taken, if that policy group exists.
Logically, this table is consulted twice during the processing of any IP packet: once upon its acceptance from the L2 entity, and once upon its transmission to the L2 entity. In actuality, for cable modems, IP filtering is generally the only IP processing done for transit traffic. This means that inbound and outbound filtering can generally be done at the same time with one pass through the filter table.
The objects in this table are only accessible from cable devices that are not operating in DiffServ MIB mode (RFC 3289). See the conformance section for details.
Note that some devices are required by other specifications (e.g., the DOCSIS OSSIv1.1 specification) to support the legacy SNMPv1/v2c docsDevFilter mode for backward compatibility.
Table entries MUST NOT persist across reboots for any device.
This table is deprecated. Instead, use the DiffServ MIB from RFC 3289." ::= { docsDevFilter 4 }
docsDevFilterIpEntry OBJECT-TYPE SYNTAX DocsDevFilterIpEntry MAX-ACCESS not-accessible STATUS deprecated DESCRIPTION "Describes a filter to apply to IP traffic received on a specified interface. All identity objects in this table (e.g., source and destination address/mask, protocol, source/dest port, TOS/mask, interface and direction) must match their respective fields in the packet for any given filter to match.
To create an entry in this table, docsDevFilterIpIfIndex must be specified." INDEX { docsDevFilterIpIndex } ::= { docsDevFilterIpTable 1 }
DocsDevFilterIpEntry ::= SEQUENCE { docsDevFilterIpIndex Integer32, docsDevFilterIpStatus RowStatus, docsDevFilterIpControl INTEGER, docsDevFilterIpIfIndex InterfaceIndexOrZero, docsDevFilterIpDirection INTEGER, docsDevFilterIpBroadcast TruthValue, docsDevFilterIpSaddr IpAddress, docsDevFilterIpSmask IpAddress, docsDevFilterIpDaddr IpAddress, docsDevFilterIpDmask IpAddress, docsDevFilterIpProtocol Integer32, docsDevFilterIpSourcePortLow Integer32, docsDevFilterIpSourcePortHigh Integer32, docsDevFilterIpDestPortLow Integer32, docsDevFilterIpDestPortHigh Integer32, docsDevFilterIpMatches ZeroBasedCounter32, docsDevFilterIpTos OCTET STRING, docsDevFilterIpTosMask OCTET STRING, docsDevFilterIpContinue TruthValue, docsDevFilterIpPolicyId Integer32 }
docsDevFilterIpIndex OBJECT-TYPE SYNTAX Integer32 (1..2147483647) MAX-ACCESS not-accessible STATUS deprecated DESCRIPTION "Index used to order the application of filters. The filter with the lowest index is always applied first." ::= { docsDevFilterIpEntry 1 }
docsDevFilterIpStatus OBJECT-TYPE SYNTAX RowStatus MAX-ACCESS read-create STATUS deprecated DESCRIPTION "Controls and reflects the status of rows in this table. Specifying only this object (with the appropriate index) on a CM is sufficient to create a filter row that matches all inbound packets on the ethernet interface and results in the packets being discarded. docsDevFilterIpIfIndex (at least) must be specified on a CMTS to create a row. Creation of the rows may be done via either create-and-wait or create-and-go, but the filter is not applied until this object is set to (or changes to) active. There is no restriction in changing any object in a row while this object is set to active." ::= { docsDevFilterIpEntry 2 }
docsDevFilterIpControl OBJECT-TYPE SYNTAX INTEGER { discard(1), accept(2), policy(3) } MAX-ACCESS read-create STATUS deprecated DESCRIPTION "If set to discard(1), all packets matching this filter will be discarded, and scanning of the remainder of the filter list will be aborted. If set to accept(2), all packets matching this filter will be accepted for further processing (e.g., bridging). If docsDevFilterIpContinue is set to true, see if there are other matches; otherwise, done. If set to policy (3), execute the policy entries matched by docsDevFilterIpPolicyId in docsDevFilterPolicyTable.
If docsDevFilterIpContinue is set to true, continue scanning the table for other matches; otherwise, done." DEFVAL { discard } ::= { docsDevFilterIpEntry 3 }
docsDevFilterIpIfIndex OBJECT-TYPE SYNTAX InterfaceIndexOrZero MAX-ACCESS read-create STATUS deprecated DESCRIPTION "The entry interface to which this filter applies. The value corresponds to ifIndex for either a CATV MAC or another interface. If the value is zero, the filter applies to all interfaces. Default value in CMs is the index of the customer-side (e.g., ethernet) interface(s). In CMTSes, this object MUST be specified to create a row in this table.
Note that according to the DOCSIS OSSIv1.1 specification, ifIndex '1' in the Cable Modem means that this row applies to all CMCI (customer-facing) interfaces." REFERENCE "DOCSIS OSSI 1.1 Specification, Section 3.3.4.1. and DOCSIS OSSI 2.0 Specification, Section 6.3.4.1." ::= { docsDevFilterIpEntry 4 }
docsDevFilterIpDirection OBJECT-TYPE
SYNTAX INTEGER { inbound(1), outbound(2), both(3) } MAX-ACCESS read-create STATUS deprecated DESCRIPTION "Determines whether the filter is applied to inbound(1) traffic, outbound(2) traffic, or traffic in both(3) directions." DEFVAL { inbound } ::= { docsDevFilterIpEntry 5 }
docsDevFilterIpBroadcast OBJECT-TYPE SYNTAX TruthValue MAX-ACCESS read-create STATUS deprecated DESCRIPTION "If set to true(1), the filter only applies to multicast and broadcast traffic. If set to false(2), the filter applies to all traffic." DEFVAL { false } ::= { docsDevFilterIpEntry 6 }
docsDevFilterIpSaddr OBJECT-TYPE SYNTAX IpAddress MAX-ACCESS read-create STATUS deprecated DESCRIPTION "The source IP address, or portion thereof, that is to be matched for this filter. The source address is first masked (ANDed) against docsDevFilterIpSmask before being compared to this value. A value of 0 for this object and 0 for the mask matches all IP addresses." DEFVAL { '00000000'h } ::= { docsDevFilterIpEntry 7 }
docsDevFilterIpSmask OBJECT-TYPE SYNTAX IpAddress MAX-ACCESS read-create STATUS deprecated DESCRIPTION "A bit mask that is to be applied to the source address prior to matching. This mask is not necessarily the same as a subnet mask, but 1s bits must be leftmost and contiguous." DEFVAL { '00000000'h } ::= { docsDevFilterIpEntry 8 }
docsDevFilterIpDaddr OBJECT-TYPE SYNTAX IpAddress MAX-ACCESS read-create STATUS deprecated DESCRIPTION "The destination IP address, or portion thereof, that is to be matched for this filter. The destination address is first masked (ANDed) against docsDevFilterIpDmask before being compared to this value. A value of 00000000 for this object and 00000000 for the mask matches all IP addresses." DEFVAL { '00000000'h } ::= { docsDevFilterIpEntry 9 }
docsDevFilterIpDmask OBJECT-TYPE SYNTAX IpAddress MAX-ACCESS read-create STATUS deprecated DESCRIPTION "A bit mask that is to be applied to the destination address prior to matching. This mask is not necessarily the same as a subnet mask, but 1s bits MUST be leftmost and contiguous." DEFVAL { '00000000'h } ::= { docsDevFilterIpEntry 10 }
docsDevFilterIpProtocol OBJECT-TYPE SYNTAX Integer32 (0..256) MAX-ACCESS read-create STATUS deprecated DESCRIPTION "The IP protocol value that is to be matched. For example, icmp is 1, tcp is 6, and udp is 17. A value of 256 matches ANY protocol." REFERENCE "www.iana.org/assignments/protocol-numbers" DEFVAL { 256 } ::= { docsDevFilterIpEntry 11 }
docsDevFilterIpSourcePortLow OBJECT-TYPE SYNTAX Integer32 (0..65535) MAX-ACCESS read-create STATUS deprecated DESCRIPTION "This is the inclusive lower bound of the transport-layer source port range that is to be matched. If the IP protocol of the packet is neither UDP nor TCP, this object is ignored during matching." REFERENCE "www.iana.org/assignments/port-numbers" DEFVAL { 0 } ::= { docsDevFilterIpEntry 12 }
docsDevFilterIpSourcePortHigh OBJECT-TYPE SYNTAX Integer32 (0..65535) MAX-ACCESS read-create STATUS deprecated DESCRIPTION "This is the inclusive upper bound of the transport-layer source port range that is to be matched. If the IP protocol of the packet is neither UDP nor TCP, this object is ignored during matching." REFERENCE "www.iana.org/assignments/port-numbers" DEFVAL { 65535 } ::= { docsDevFilterIpEntry 13 }
okay bestie, the deprecated era continues 💀 every object in this chunk is marked STATUS deprecated, so these are the old-school filter definitions 🧚
docsDevFilterIpDestPortLow OBJECT-TYPE
SYNTAX Integer32 (0..65535)
MAX-ACCESS read-create
STATUS deprecated
DESCRIPTION
"This is the inclusive lower bound of the transport-layer
destination port range that is to be matched. If the IP
protocol of the packet is neither UDP nor TCP, this
object is ignored during matching."
REFERENCE "www.iana.org/assignments/port-numbers"
DEFVAL { 0 }
::= { docsDevFilterIpEntry 14 }
docsDevFilterIpDestPortHigh OBJECT-TYPE
SYNTAX Integer32 (0..65535)
MAX-ACCESS read-create
STATUS deprecated
DESCRIPTION
"This is the inclusive upper bound of the transport-layer
destination port range that is to be matched. If the IP
protocol of the packet is neither UDP nor TCP, this
object is ignored during matching."
REFERENCE "www.iana.org/assignments/port-numbers"
DEFVAL { 65535 }
::= { docsDevFilterIpEntry 15 }
docsDevFilterIpMatches OBJECT-TYPE
SYNTAX ZeroBasedCounter32
UNITS "matches"
MAX-ACCESS read-only
STATUS deprecated
DESCRIPTION
"Counts the number of times this filter was matched.
This object is initialized to 0 at boot, or at row
creation, and is reset only upon reboot."
::= { docsDevFilterIpEntry 16 }
docsDevFilterIpTos OBJECT-TYPE
SYNTAX OCTET STRING (SIZE (1))
MAX-ACCESS read-create
STATUS deprecated
DESCRIPTION
"This is the value to be matched to the packet's
TOS (Type of Service) value (after the TOS value
is ANDed with docsDevFilterIpTosMask). A value for this
object of 0 and a mask of 0 matches all TOS values."
DEFVAL { '00'h }
::= { docsDevFilterIpEntry 17 }
docsDevFilterIpTosMask OBJECT-TYPE
SYNTAX OCTET STRING (SIZE (1))
MAX-ACCESS read-create
STATUS deprecated
DESCRIPTION
"The mask to be applied to the packet's TOS value before
matching."
DEFVAL { '00'h }
::= { docsDevFilterIpEntry 18 }
docsDevFilterIpContinue OBJECT-TYPE
SYNTAX TruthValue
MAX-ACCESS read-create
STATUS deprecated
DESCRIPTION
"If this value is set to true and docsDevFilterIpControl
is anything but discard (1), continue scanning and
applying policies. See Section 3.3.3 for more
details."
DEFVAL { false }
::= { docsDevFilterIpEntry 19 }
docsDevFilterIpPolicyId OBJECT-TYPE
SYNTAX Integer32 (0..2147483647)
MAX-ACCESS read-create
STATUS deprecated
DESCRIPTION
"This object points to an entry in
docsDevFilterPolicyTable. If docsDevFilterIpControl
is set to policy (3), execute all matching policies
in docsDevFilterPolicyTable. If no matching policy
exists, treat as if docsDevFilterIpControl were set
to accept (1). If this object is set to the value of
0, there is no matching policy, and
docsDevFilterPolicyTable MUST NOT be consulted."
DEFVAL { 0 }
::= { docsDevFilterIpEntry 20 }
--
-- Policy Mapping Table
--
docsDevFilterPolicyTable OBJECT-TYPE
SYNTAX SEQUENCE OF DocsDevFilterPolicyEntry
MAX-ACCESS not-accessible
STATUS deprecated
DESCRIPTION
"A Table that maps between a policy group ID and a set
of pointers to policies to be applied. All rows with
the same docsDevFilterPolicyId are part of the same
group of policy pointers and are applied in the order
in this table. docsDevFilterPolicyTable exists to
allow multiple policy actions (referenced by policy
pointers) to be applied to any given classified packet.
The policy actions are applied in index order.
For example:
Index ID Type Action
1 1 TOS 1
9 5 TOS 1
12 1 IPSEC 3
This says that a packet that matches a filter with
policy id 1 first has TOS policy 1 applied (which might
set the TOS bits to enable a higher priority) and next
has the IPSEC policy 3 applied (which may result in the
packets being dumped into a secure VPN to a remote
encryptor).
Policy ID 0 is reserved for default actions and is
applied only to packets that match no filters in
docsDevFilterIpTable.
Table entries MUST NOT persist across reboots for any
device.
This table is deprecated. Instead, use the DiffServ MIB
from RFC 3289."
::= { docsDevFilter 5 }
docsDevFilterPolicyEntry OBJECT-TYPE
SYNTAX DocsDevFilterPolicyEntry
MAX-ACCESS not-accessible
STATUS deprecated
DESCRIPTION
"An entry in the docsDevFilterPolicyTable. Entries are
created by Network Management. To create an entry,
docsDevFilterPolicyId MUST be specified."
INDEX { docsDevFilterPolicyIndex }
::= { docsDevFilterPolicyTable 1 }
DocsDevFilterPolicyEntry ::= SEQUENCE {
docsDevFilterPolicyIndex Integer32,
docsDevFilterPolicyId Integer32,
-- docsDevFilterPolicyType INTEGER,
-- docsDevFilterPolicyAction Integer32,
docsDevFilterPolicyStatus RowStatus,
docsDevFilterPolicyPtr RowPointer
}
docsDevFilterPolicyIndex OBJECT-TYPE
SYNTAX Integer32 (1..2147483647)
MAX-ACCESS not-accessible
STATUS deprecated
DESCRIPTION "Index value for the table."
::= { docsDevFilterPolicyEntry 1 }
docsDevFilterPolicyId OBJECT-TYPE
SYNTAX Integer32 (0..2147483647)
MAX-ACCESS read-create
STATUS deprecated
DESCRIPTION
"Policy ID for this entry. If a policy ID can apply to
multiple rows of this table, all relevant policies are
executed. Policy 0 (if populated) is applied to all
packets that do not match any of the filters. N.B. If
docsDevFilterIpPolicyId is set to 0, it DOES NOT match
policy 0 of this table."
::= { docsDevFilterPolicyEntry 2 }
-- The following two objects were removed and never used; however,
-- to preserve OID numbering, they are simply commented out to
-- to ensure that they are not used again.
-- docsDevFilterPolicyType ::= { docsDevFilterPolicyEntry 3 }
-- docsDevFilterPolicyAction ::= { docsDevFilterPolicyEntry 4 }
docsDevFilterPolicyStatus OBJECT-TYPE
SYNTAX RowStatus
MAX-ACCESS read-create
STATUS deprecated
DESCRIPTION
"Object used to create an entry in this table. There is
no restriction in changing any object in a row while
this object is set to active.
The following object MUST have a valid value before this
object can be set to active: docsDevFilterPolicyPtr."
::= { docsDevFilterPolicyEntry 5 }
docsDevFilterPolicyPtr OBJECT-TYPE
SYNTAX RowPointer
MAX-ACCESS read-create
STATUS deprecated
DESCRIPTION
"This object points to a row in an applicable filter
policy table. Currently, the only standard policy
table is docsDevFilterTosTable.
Per the textual convention, this object points to the
first accessible object in the row; e.g., to point to a
row in docsDevFilterTosTable with an index of 21, the
value of this object would be the object identifier
docsDevTosStatus.21.
Vendors are recommended to adhere to the same convention
when adding vendor-specific policy table extensions.
If this pointer references an empty or non-existent
row, then no policy action is taken.
The default upon row creation is a null pointer that
results in no policy action being taken."
DEFVAL { zeroDotZero }
::= { docsDevFilterPolicyEntry 6 }
--
-- TOS Policy action table
--
docsDevFilterTosTable OBJECT-TYPE
SYNTAX SEQUENCE OF DocsDevFilterTosEntry
MAX-ACCESS not-accessible
STATUS deprecated
DESCRIPTION
"Table used to describe Type of Service (TOS) bits
processing.
This table is an adjunct to the docsDevFilterIpTable
and the docsDevFilterPolicy table. Entries in the
latter table can point to specific rows in this (and
other) tables and cause specific actions to be taken.
This table permits the manipulation of the value of the
Type of Service bits in the IP header of the matched
packet as follows:
Set the tosBits of the packet to
(tosBits & docsDevFilterTosAndMask) |
docsDevFilterTosOrMask
This construct allows you to do a clear and set of all
the TOS bits in a flexible manner.
Table entries MUST NOT persist across reboots for any
device.
This table is deprecated. Instead, use the DiffServ MIB
from RFC 3289."
::= { docsDevFilter 6 }
docsDevFilterTosEntry OBJECT-TYPE
SYNTAX DocsDevFilterTosEntry
MAX-ACCESS not-accessible
STATUS deprecated
DESCRIPTION
"A TOS policy entry."
INDEX { docsDevFilterTosIndex }
::= { docsDevFilterTosTable 1 }
DocsDevFilterTosEntry ::= SEQUENCE {
docsDevFilterTosIndex Integer32,
docsDevFilterTosStatus RowStatus,
docsDevFilterTosAndMask OCTET STRING,
docsDevFilterTosOrMask OCTET STRING
}
docsDevFilterTosIndex OBJECT-TYPE
SYNTAX Integer32 (1..2147483647)
MAX-ACCESS not-accessible
STATUS deprecated
DESCRIPTION
"The unique index for this row. There are no ordering
requirements for this table, and any valid index may be
specified."
::= { docsDevFilterTosEntry 1 }heads up: every object here is marked deprecated, so if you're building something new, check out the DiffServ MIB from RFC 3289 instead 🎀
docsDevFilterTosStatus OBJECT-TYPE SYNTAX RowStatus MAX-ACCESS read-create STATUS deprecated DESCRIPTION "The object used to create and delete entries in this table. A row created by specifying just this object results in a row that specifies no change to the TOS bits. A row may be created using either the create-and-go or create-and-wait paradigms. There is no restriction on the ability to change values in this row while the row is active." ::= { docsDevFilterTosEntry 2 }
docsDevFilterTosAndMask OBJECT-TYPE SYNTAX OCTET STRING (SIZE (1)) MAX-ACCESS read-create STATUS deprecated DESCRIPTION "This value is bitwise ANDed with the matched packet's TOS bits." DEFVAL { 'ff'h } ::= { docsDevFilterTosEntry 3 }
docsDevFilterTosOrMask OBJECT-TYPE SYNTAX OCTET STRING (SIZE (1)) MAX-ACCESS read-create STATUS deprecated DESCRIPTION "This value is bitwise ORed with the result from the AND procedure (tosBits & docsDevFilterTosAndMask). The result then replaces the packet's TOS bits." DEFVAL { '00'h } ::= { docsDevFilterTosEntry 4 }
-- -- CPE IP Management and anti-spoofing group. Only implemented on -- Cable Modems. --
docsDevCpe OBJECT IDENTIFIER ::= { docsDevMIBObjects 7 }
docsDevCpeEnroll OBJECT-TYPE SYNTAX INTEGER { none(1), any(2)
} MAX-ACCESS read-write STATUS current DESCRIPTION "This object controls the population of docsDevFilterCpeTable. If set to none, the filters must be set manually by a network management action (either configuration or SNMP set). If set to any, the CM wiretaps the packets originating from the ethernet and enrolls up to docsDevCpeIpMax addresses as based on the source IPv4 or v6 addresses of those packets." DEFVAL { any } ::= { docsDevCpe 1 }
docsDevCpeIpMax OBJECT-TYPE SYNTAX Integer32 (-1..2147483647) MAX-ACCESS read-write STATUS current DESCRIPTION "This object controls the maximum number of CPEs allowed to be learned behind this device. If set to zero, any number of CPEs may connect up to the maximum permitted for the device. If set to -1, no filtering is done on CPE source addresses, and no entries are made in the docsDevFilterCpeTable via learning. If an attempt is made to set this to a number greater than that permitted for the device, it is set to that maximum." DEFVAL { -1 } ::= { docsDevCpe 2 }
docsDevCpeTable OBJECT-TYPE SYNTAX SEQUENCE OF DocsDevCpeEntry MAX-ACCESS not-accessible STATUS deprecated DESCRIPTION "This table lists the IPv4 addresses seen (or permitted) as source addresses in packets originating from the customer interface on this device. In addition, this table can be provisioned with the specific addresses permitted for the CPEs via the normal row creation mechanisms. Table entries MUST NOT persist across reboots for any device.
N.B. Management action can add entries in this table and in docsDevCpeIpTable past the value of docsDevCpeIpMax. docsDevCpeIpMax ONLY restricts the ability of the CM to add learned addresses automatically.
This table is deprecated and is replaced by docsDevCpeInetTable." ::= { docsDevCpe 3 }
docsDevCpeEntry OBJECT-TYPE SYNTAX DocsDevCpeEntry MAX-ACCESS not-accessible STATUS deprecated DESCRIPTION "An entry in the docsDevFilterCpeTable. There is one entry for each IPv4 CPE seen or provisioned. If docsDevCpeIpMax is set to -1, this table is ignored; otherwise, upon receipt of an IP packet from the customer interface of the CM, the source IP address is checked against this table. If the address is in the table, packet processing continues. If the address is not in the table but docsDevCpeEnroll is set to any and the sum of the table sizes of docsDevCpeTable and docsDevCpeInetTable is less than docsDevCpeIpMax, the address is added to the table, and packet processing continues. Otherwise, the packet is dropped.
The filtering actions specified by this table occur after any LLC filtering (docsDevFilterLLCTable), but prior to any IP filtering (docsDevFilterIpTable, docsDevNmAccessTable)." INDEX { docsDevCpeIp } ::= {docsDevCpeTable 1 }
DocsDevCpeEntry ::= SEQUENCE { docsDevCpeIp IpAddress, docsDevCpeSource INTEGER, docsDevCpeStatus RowStatus }
docsDevCpeIp OBJECT-TYPE SYNTAX IpAddress MAX-ACCESS not-accessible STATUS deprecated DESCRIPTION "The IPv4 address to which this entry applies.
N.B. Attempts to set all zeros or all ones address values MUST be rejected."
::= { docsDevCpeEntry 1 }
docsDevCpeSource OBJECT-TYPE SYNTAX INTEGER { other(1), manual(2), learned(3) }
MAX-ACCESS read-only STATUS deprecated DESCRIPTION "This object describes how this entry was created. If the value is manual(2), this row was created by a network management action (either configuration or SNMP set). If set to learned(3), then it was found via looking at the source IPv4 address of a received packet. The value other(1) is used for any entries that do not meet manual(2) or learned(3) criteria." ::= { docsDevCpeEntry 2 }
docsDevCpeStatus OBJECT-TYPE SYNTAX RowStatus MAX-ACCESS read-create STATUS deprecated DESCRIPTION "Standard object to manipulate rows. To create a row in this table, one only needs to specify this object. Management stations SHOULD use the create-and-go mechanism for creating rows in this table." ::= { docsDevCpeEntry 3 }
-- -- Internet CPE Management and anti spoofing group, for support of -- non-IPv4 CPEs. --
docsDevCpeInetTable OBJECT-TYPE SYNTAX SEQUENCE OF DocsDevCpeInetEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "This table lists the IP addresses seen (or permitted) as source addresses in packets originating from the customer interface on this device. In addition, this table can be provisioned with the specific addresses permitted for the CPEs via the normal row creation mechanisms.
N.B. Management action can add entries in this table and in docsDevCpeIpTable past the value of docsDevCpeIpMax. docsDevCpeIpMax ONLY restricts the ability of the CM to add learned addresses automatically.
Table entries MUST NOT persist across reboots for any device.
This table exactly mirrors docsDevCpeTable and applies to IPv4 and IPv6 addresses." ::= { docsDevCpe 4 }
docsDevCpeInetEntry OBJECT-TYPE SYNTAX DocsDevCpeInetEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "An entry in the docsDevFilterCpeInetTable. There is one entry for each IP CPE seen or provisioned. If docsDevCpeIpMax is set to -1, this table is ignored; otherwise, upon receipt of an IP packet from the customer interface of the CM, the source IP address is checked against this table. If the address is in the table, packet processing continues. If the address is not in the table but docsDevCpeEnroll is set to any and the sum of the table sizes for docsDevCpeTable and docsDevCpeInetTable is less than docsDevCpeIpMax, the address is added to the table, and packet processing continues. Otherwise, the packet is dropped.
The filtering actions specified by this table occur after any LLC filtering (docsDevFilterLLCTable), but prior to any IP filtering (docsDevFilterIpTable, docsDevNmAccessTable).
When an agent (cable modem) restarts, then all dynamically created rows are lost." INDEX { docsDevCpeInetType, docsDevCpeInetAddr } ::= { docsDevCpeInetTable 1 }
DocsDevCpeInetEntry ::= SEQUENCE { docsDevCpeInetType InetAddressType, docsDevCpeInetAddr InetAddress, docsDevCpeInetSource INTEGER, docsDevCpeInetRowStatus RowStatus }
docsDevCpeInetType OBJECT-TYPE SYNTAX InetAddressType MAX-ACCESS not-accessible STATUS current DESCRIPTION "The type of internet address of docsDevCpeInetAddr." ::= { docsDevCpeInetEntry 1 }
docsDevCpeInetAddr OBJECT-TYPE SYNTAX InetAddress MAX-ACCESS not-accessible STATUS current DESCRIPTION "The Internet address to which this entry applies.
Implementors need to be aware that if the size of docsDevCpeInetAddr exceeds 114 octets OIDs of instances of columns in this row will have more than 128 sub-identifiers and cannot be accessed using SNMPv1, SNMPv2c, or SNMPv3. Only unicast address are allowed for this object." ::= { docsDevCpeInetEntry 2 }
docsDevCpeInetSource OBJECT-TYPE SYNTAX INTEGER { manual(2), learned(3) } MAX-ACCESS read-only STATUS current DESCRIPTION "This object describes how this entry was created. If the value is manual(2), this row was created by a network management action (either configuration or SNMP set). If set to learned(3), then it was found via looking at the source IP address of a received packet." ::= { docsDevCpeInetEntry 3 }
okay so the MIB is about to get SO good 💅🎀 Picking up right where the last part left off, with the device-definition objects and the conformance groups:
docsDevCpeInetRowStatus OBJECT-TYPE
SYNTAX RowStatus
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"Standard object to manipulate rows. To create a row in
this table, one only needs to specify this object.
Management stations SHOULD use the create-and-go
mechanism for creating rows in this table."
::= { docsDevCpeInetEntry 4 }
--
-- Placeholder for notifications/traps.
--
-- erroneous, DO NOT USE docsDevNotification
docsDevNotification OBJECT IDENTIFIER ::= { docsDev 2 }
-- erroneous, DO NOT USE docsDevNotification
docsDevNotifications OBJECT IDENTIFIER ::= { docsDev 0 }
--
-- RFC 2669 Conformance definitions
--
docsDevConformance OBJECT IDENTIFIER ::= { docsDev 3 }
docsDevGroups OBJECT IDENTIFIER ::= { docsDevConformance 1 }
docsDevCompliances OBJECT IDENTIFIER ::= { docsDevConformance 2 }
docsDevBasicCompliance MODULE-COMPLIANCE
STATUS deprecated
DESCRIPTION
"The RFC 2669 compliance statement for MCNS/DOCSIS
Cable Modems and Cable Modem Termination Systems."
MODULE -- docsDev
-- conditionally mandatory groups
GROUP docsDevBaseGroup
DESCRIPTION
"Mandatory in Cable Modems, optional in Cable Modem
Termination Systems."
GROUP docsDevEventGroup
DESCRIPTION
"Mandatory in Cable Modems, optional in Cable Modem
Termination Systems."
GROUP docsDevFilterGroup
DESCRIPTION
"Mandatory in Cable Modems, optional in Cable Modem
Termination Systems."
GROUP docsDevNmAccessGroup
DESCRIPTION
"This group is only implemented in devices that do not
implement the SNMPv3 User Security Model. It SHOULD NOT
be implemented by devices that conform to SNMPv3.
For devices that do not implement SNMPv3 or later, this
group is Mandatory in Cable Modems and is optional
in Cable Modem Termination Systems."
GROUP docsDevServerGroup
DESCRIPTION
"This group is implemented only in Cable Modems, and is
not implemented in Cable Modem Termination Systems."
GROUP docsDevSoftwareGroup
DESCRIPTION
"This group is Mandatory in Cable Modems and optional in
Cable Modem Termination Systems."
GROUP docsDevCpeGroup
DESCRIPTION
"This group is Mandatory in Cable Modems, and is
not implemented in Cable Modem Termination Systems."
OBJECT docsDevSTPControl
MIN-ACCESS read-only
DESCRIPTION
"It is compliant to implement this object as read-only.
Devices need only support noStFilterBpdu(2)."
OBJECT docsDevNmAccessIp
DESCRIPTION
"It is compliant to recognize the IP address
255.255.255.255 as referring to any NMS."
OBJECT docsDevEvReporting
MIN-ACCESS read-only
DESCRIPTION
"It is compliant to implement this object as read-only.
Devices need only support local(0). An agent need not
enforce that trap or syslog logging be accompanied
by local(0) or localVolatile(3) logging."
::= { docsDevCompliances 1 }
docsDevBaseGroup OBJECT-GROUP
OBJECTS {
docsDevRole,
docsDevDateTime,
docsDevResetNow,
docsDevSerialNumber,
docsDevSTPControl
}
STATUS current
DESCRIPTION
"A collection of objects providing device status and
control."
::= { docsDevGroups 1 }
docsDevNmAccessGroup OBJECT-GROUP
OBJECTS {
docsDevNmAccessIp,
docsDevNmAccessIpMask,
docsDevNmAccessCommunity,
docsDevNmAccessControl,
docsDevNmAccessInterfaces,
docsDevNmAccessStatus
}
STATUS deprecated
DESCRIPTION
"A collection of objects for controlling access to SNMP
objects on cable devices.
This group has been deprecated because all the
objects have been deprecated in favor of SNMPv3 and
Coexistence MIBs."
::= { docsDevGroups 2 }
docsDevSoftwareGroup OBJECT-GROUP
OBJECTS {
docsDevSwServer,
docsDevSwFilename,
docsDevSwAdminStatus,
docsDevSwOperStatus,
docsDevSwCurrentVers
}
STATUS deprecated
DESCRIPTION
"A collection of objects for controlling software
downloads.
This group has been deprecated and replaced by
docsDevSoftwareGroupV2. Object docsDevSwServer
has been replaced by docsDevSwServerAddressType
and docsDevSwServerAddress, and
docsDevSwServerTransportProtocol has been added to
support TFTP and HTTP firmware downloads."
::= { docsDevGroups 3 }
docsDevServerGroup OBJECT-GROUP
OBJECTS {
docsDevServerBootState,
docsDevServerDhcp,
docsDevServerTime,
docsDevServerTftp,
docsDevServerConfigFile
}
STATUS deprecated
DESCRIPTION
"A collection of objects providing status about server
provisioning.
This group has been deprecated and replaced by
docsDevServerGroupV2. The objects docsDevServerDhcp,
docsDevServerTime, and docsDevServerTftp have
been replaced by docsDevServerDhcpAddressType,
docsDevServerDhcpAddress, docsDevServerTimeAddressType,
docsDevServerTimeAddress,
docsDevServerConfigTftpAddressType, and
docsDevServerConfigTftpAddress."
::= { docsDevGroups 4 }
docsDevEventGroup OBJECT-GROUP
OBJECTS {
docsDevEvControl,
docsDevEvSyslog,
docsDevEvThrottleAdminStatus,
docsDevEvThrottleInhibited,
docsDevEvThrottleThreshold,
docsDevEvThrottleInterval,
docsDevEvReporting,
docsDevEvFirstTime,
docsDevEvLastTime,
docsDevEvCounts,
docsDevEvLevel,
docsDevEvId,
docsDevEvText
}
STATUS deprecated
DESCRIPTION
"A collection of objects used to control and monitor
events.
This group has been deprecated and replaced by
docsDevEventGroupV2. The object docsDevEvSyslog has
been replaced by docsDevEvSyslogAddressType and
docsDevEvSyslogAddress, and docsDevEvThrottleInhibited
has been replaced by
docsDevEvThrottleThresholdExceeded."
::= { docsDevGroups 5 }
docsDevFilterGroup OBJECT-GROUP
OBJECTS {
docsDevFilterLLCUnmatchedAction,
docsDevFilterIpDefault,
docsDevFilterLLCStatus,
docsDevFilterLLCIfIndex,
docsDevFilterLLCProtocolType,
docsDevFilterLLCProtocol,
docsDevFilterLLCMatches,
docsDevFilterIpControl,
docsDevFilterIpIfIndex,
docsDevFilterIpStatus,
docsDevFilterIpDirection,
docsDevFilterIpBroadcast,
docsDevFilterIpSaddr,
docsDevFilterIpSmask,
docsDevFilterIpDaddr,
docsDevFilterIpDmask,
docsDevFilterIpProtocol,
docsDevFilterIpSourcePortLow,
docsDevFilterIpSourcePortHigh,
docsDevFilterIpDestPortLow,
docsDevFilterIpDestPortHigh,
docsDevFilterIpMatches,
docsDevFilterIpTos,
docsDevFilterIpTosMask,
docsDevFilterIpContinue,
docsDevFilterIpPolicyId,
docsDevFilterPolicyId,
docsDevFilterPolicyStatus,
docsDevFilterPolicyPtr,
docsDevFilterTosStatus,
docsDevFilterTosAndMask,
docsDevFilterTosOrMask
}
STATUS deprecated
DESCRIPTION
"A collection of objects to specify filters at the link
layer and IPv4 layer.
This group has been deprecated and replaced by various
groups from the DiffServ MIB."
::= { docsDevGroups 6 }
docsDevCpeGroup OBJECT-GROUP
OBJECTS {
docsDevCpeEnroll,
docsDevCpeIpMax,
docsDevCpeSource,
docsDevCpeStatus
}
STATUS deprecated
DESCRIPTION
"A collection of objects used to control the number
and specific values of IPv4 addresses allowed for
associated Customer Premises Equipment (CPE).
This group has been deprecated and replaced by
docsDevInetCpeGroup. The object docsDevCpeSource has
been replaced by docsDevCpeInetSource, and
docsDevCpeStatus has been replaced by
docsDevCpeInetRowStatus."
::= { docsDevGroups 7 }
--
-- RFC 4639 Conformance definitions
--
docsDevGroupsV2 OBJECT IDENTIFIER ::= { docsDevConformance 3 }
docsDevCompliancesV2 OBJECT IDENTIFIER ::= { docsDevConformance 4 }
docsDevCmCompliance MODULE-COMPLIANCE
STATUS current
DESCRIPTION
"The compliance statement for DOCSIS Cable Modems.
This compliance statement applies to implementations
of DOCSIS versions that are not IPv6 capable."
MODULE DIFFSERV-MIB -- RFC 3289
MANDATORY-GROUPS {
diffServMIBDataPathGroup,
diffServMIBClfrGroup,
diffServMIBClfrElementGroup,
diffServMIBMultiFieldClfrGroup,
diffServMIBActionGroup,
diffServMIBDscpMarkActGroup,
diffServMIBCounterGroup,
diffServMIBAlgDropGroup
}
OBJECT diffServDataPathStatus -- same as RFC 3289
SYNTAX RowStatus { active(1) }
WRITE-SYNTAX RowStatus { createAndGo(4), destroy(6) }
DESCRIPTION
"Support for createAndWait and notInService is not
required."
OBJECT diffServClfrStatus -- same as RFC 3289
SYNTAX RowStatus { active(1) }
WRITE-SYNTAX RowStatus { createAndGo(4), destroy(6) }
DESCRIPTION
"Support for createAndWait and notInService is not
required."
OBJECT diffServClfrElementStatus -- same as RFC 3289
SYNTAX RowStatus { active(1) }
WRITE-SYNTAX RowStatus { createAndGo(4), destroy(6) }
DESCRIPTION
"Support for createAndWait and notInService is not
required."
OBJECT diffServMultiFieldClfrAddrType
SYNTAX InetAddressType { ipv4(1) }
DESCRIPTION
"An implementation is only required to support IPv4
addresses."ngl the deprecated-group stuff is giving "we've moved on but we're still keeping the receipts" 🙈 Stay tuned for the next part, bestie 🧚💜
okay bestie 🎀 we're deep in the MIB zone now, and these OBJECT and GROUP clauses are basically the fine print saying which pieces a device has to support and which ones it can skip 💅 the exact text stays in the block below so nothing gets fuzzy 🦋✨
OBJECT diffServMultiFieldClfrSrcAddr
SYNTAX InetAddress (SIZE(4))
DESCRIPTION
"An implementation is only required to support IPv4
addresses."
OBJECT diffServMultiFieldClfrDstAddr
SYNTAX InetAddress (SIZE(4))
DESCRIPTION
"An implementation is only required to support IPv4
addresses."
OBJECT diffServAlgDropStatus -- same as RFC 3289
SYNTAX RowStatus { active(1) }
WRITE-SYNTAX RowStatus { createAndGo(4), destroy(6) }
DESCRIPTION
"Support for createAndWait and notInService is not
required."
OBJECT diffServDataPathStorage
SYNTAX StorageType { volatile(2) }
DESCRIPTION
"An implementation is only required to support
volatile storage."
OBJECT diffServClfrStorage
SYNTAX StorageType { volatile(2) }
DESCRIPTION
"An implementation is only required to support
volatile storage."
OBJECT diffServClfrElementStorage
SYNTAX StorageType { volatile(2) }
DESCRIPTION
"An implementation is only required to support
volatile storage."
OBJECT diffServMultiFieldClfrStorage
SYNTAX StorageType { volatile(2) }
DESCRIPTION
"An implementation is only required to support
volatile storage."
OBJECT diffServActionStorage
SYNTAX StorageType { volatile(2) }
DESCRIPTION
"An implementation is only required to support
volatile storage."
OBJECT diffServCountActStorage
SYNTAX StorageType { volatile(2) }
DESCRIPTION
"An implementation is only required to support
volatile storage."
OBJECT diffServAlgDropStorage
SYNTAX StorageType { volatile(2) }
DESCRIPTION
"An implementation is only required to support
volatile storage."
OBJECT diffServAlgDropType
SYNTAX INTEGER { alwaysDrop(5) }
DESCRIPTION
"This object is only used to provide packet
filtering. Implementations need not support other
values of this enumeration."
MODULE -- docsDev
MANDATORY-GROUPS {
docsDevBaseGroup,
docsDevBaseIgmpGroup,
docsDevBaseMaxCpeGroup,
docsDevSoftwareGroupV2,
docsDevServerGroupV2,
docsDevEventGroupV2,
docsDevFilterLLCGroup
}
-- conditionally mandatory groups
GROUP docsDevInetCpeGroup
DESCRIPTION
"This group is optional in Cable Modems."
OBJECT docsDevDateTime
MIN-ACCESS read-only
DESCRIPTION
"It is compliant to implement this object as read-only."
OBJECT docsDevSTPControl
SYNTAX INTEGER { noStFilterBpdu(2) }
MIN-ACCESS read-only
DESCRIPTION
"It is compliant to implement this object as read-only.
Devices need only support noStFilterBpdu(2)."
OBJECT docsDevIgmpModeControl
SYNTAX INTEGER { passive(1) }
MIN-ACCESS read-only
DESCRIPTION
"It is compliant to implement this object as read-only.
Devices need only support passive(1)."
OBJECT docsDevSwServerAddressType
SYNTAX InetAddressType { ipv4(1) }
DESCRIPTION
"An implementation is only required to support IPv4
addresses."
OBJECT docsDevSwServerAddress
SYNTAX InetAddress (SIZE(4))
DESCRIPTION
"An implementation is only required to support IPv4
addresses."
OBJECT docsDevServerDhcpAddressType
SYNTAX InetAddressType { ipv4(1) }
DESCRIPTION
"An implementation is only required to support IPv4
addresses."
OBJECT docsDevServerDhcpAddress
SYNTAX InetAddress (SIZE(4))
DESCRIPTION
"An implementation is only required to support IPv4
addresses."
OBJECT docsDevServerTimeAddressType
SYNTAX InetAddressType { ipv4(1) }
DESCRIPTION
"An implementation is only required to support IPv4
addresses."
OBJECT docsDevServerTimeAddress
SYNTAX InetAddress (SIZE(4))
DESCRIPTION
"An implementation is only required to support IPv4
addresses."
OBJECT docsDevServerConfigTftpAddressType
SYNTAX InetAddressType { ipv4(1) }
DESCRIPTION
"An implementation is only required to support IPv4
addresses."
OBJECT docsDevServerConfigTftpAddress
SYNTAX InetAddress (SIZE(4))
DESCRIPTION
"An implementation is only required to support IPv4
addresses."
OBJECT docsDevEvReporting
MIN-ACCESS read-only
DESCRIPTION
"It is compliant to implement this object as read-only.
Devices need only support local(0)."
OBJECT docsDevEvSyslogAddressType
SYNTAX InetAddressType { ipv4(1) }
DESCRIPTION
"An implementation is only required to support IPv4
addresses."
OBJECT docsDevEvSyslogAddress
SYNTAX InetAddress (SIZE(4))
DESCRIPTION
"An implementation is only required to support IPv4
addresses."
OBJECT docsDevSwServerTransportProtocol
SYNTAX INTEGER { tftp(1) }
DESCRIPTION
"An implementation is only required to support TFTP
software image downloads."
::= { docsDevCompliancesV2 1 }
docsDevCmtsCompliance MODULE-COMPLIANCE
STATUS current
DESCRIPTION
"The compliance statement for DOCSIS Cable Modem
Termination Systems.
This compliance statement applies to implementations
of DOCSIS versions that are not IPv6 capable."
MODULE -- docsDev
-- conditionally mandatory groups
GROUP docsDevBaseGroup
DESCRIPTION
"Optional in Cable Modem Termination Systems."
GROUP docsDevBaseIgmpGroup
DESCRIPTION
"Optional in Cable Modem Termination Systems."
GROUP docsDevBaseMaxCpeGroup
DESCRIPTION
"This group MUST NOT be implemented in Cable Modem
Termination Systems."
GROUP docsDevSoftwareGroupV2
DESCRIPTION
"Optional in Cable Modem Termination Systems."
GROUP docsDevServerGroupV2
DESCRIPTION
"This group MUST NOT be implemented in Cable Modem
Termination Systems."
GROUP docsDevEventGroupV2
DESCRIPTION
"Optional in Cable Modem Termination Systems."
GROUP docsDevFilterLLCGroup
DESCRIPTION
"This group MUST NOT be implemented in Cable Modem
Termination Systems. See the Subscriber Management
MIB for similar CMTS capability."
GROUP docsDevInetCpeGroup
DESCRIPTION
"This group MUST NOT be implemented in Cable Modem
Termination Systems. See the Subscriber Management
MIB for similar CMTS capability."
OBJECT docsDevDateTime
MIN-ACCESS read-only
DESCRIPTION
"It is compliant to implement this object as read-only."
OBJECT docsDevSTPControl
SYNTAX INTEGER { noStFilterBpdu(2) }
MIN-ACCESS read-only
DESCRIPTION
"It is compliant to implement this object as read-only.
Devices need only support noStFilterBpdu(2)."
OBJECT docsDevIgmpModeControl
SYNTAX INTEGER { passive(1) }
MIN-ACCESS read-only
DESCRIPTION
"It is compliant to implement this object as read-only.
Devices need only support passive(1)."
OBJECT docsDevSwServerAddressType
SYNTAX InetAddressType { ipv4(1) }
DESCRIPTION
"An implementation is only required to support IPv4
addresses."
OBJECT docsDevSwServerAddress
SYNTAX InetAddress (SIZE(4))
DESCRIPTION
"An implementation is only required to support IPv4
addresses."
OBJECT docsDevEvReporting
MIN-ACCESS read-only
DESCRIPTION
"It is compliant to implement this object as read-only.
Devices need only support local(0)."
OBJECT docsDevEvSyslogAddressType
SYNTAX InetAddressType { ipv4(1) }
DESCRIPTION
"An implementation is only required to support IPv4
addresses."
OBJECT docsDevEvSyslogAddress
SYNTAX InetAddress (SIZE(4))
DESCRIPTION
"An implementation is only required to support IPv4
addresses."
OBJECT docsDevSwServerTransportProtocol
SYNTAX INTEGER { tftp(1) }
DESCRIPTION
"An implementation is only required to support TFTP
software image downloads."
::= { docsDevCompliancesV2 2 }
docsDevBaseIgmpGroup OBJECT-GROUP
OBJECTS {
docsDevIgmpModeControl
}
STATUS current
DESCRIPTION
"An object providing cable device IGMP status and
control."
::= { docsDevGroupsV2 1 }
docsDevBaseMaxCpeGroup OBJECT-GROUP
OBJECTS {
docsDevMaxCpe
}
STATUS current
DESCRIPTION
"An object providing management of the maximum number of
CPEs permitted access through a cable modem."
::= { docsDevGroupsV2 2 }
docsDevNmAccessExtGroup OBJECT-GROUP
OBJECTS {
docsDevNmAccessTrapVersion
}
STATUS deprecated
DESCRIPTION
"An object, in addition to the objects in
docsDevNmAccessGroup, for controlling access to
SNMP objects on cable devices.
This group is included in this MIB due to existing
implementations of docsDevNmAccessTrapVersion in
DOCSIS cable modems.
This group has been deprecated because the object has
been deprecated in favor of SNMPv3 and Coexistence
MIBs."
::= { docsDevGroupsV2 3 }
docsDevSoftwareGroupV2 OBJECT-GROUP
OBJECTS {
docsDevSwFilename,
docsDevSwAdminStatus,
docsDevSwOperStatus,
docsDevSwCurrentVers,
docsDevSwServerAddressType,
docsDevSwServerAddress,
docsDevSwServerTransportProtocol
}
STATUS current
DESCRIPTION
"A collection of objects for controlling software
downloads. This group replaces docsDevSoftwareGroup."
::= { docsDevGroupsV2 4 }Okay so the groups are up next, and these are the bundles that tell you which objects go together 🎀
docsDevServerGroupV2 OBJECT-GROUP
OBJECTS {
docsDevServerBootState,
docsDevServerDhcpAddressType,
docsDevServerDhcpAddress,
docsDevServerTimeAddressType,
docsDevServerTimeAddress,
docsDevServerConfigTftpAddressType,
docsDevServerConfigTftpAddress,
docsDevServerConfigFile
}
STATUS current
DESCRIPTION
"A collection of objects providing status about server
provisioning. This group replaces docsDevServerGroup."
::= { docsDevGroupsV2 5 }
docsDevEventGroupV2 OBJECT-GROUP
OBJECTS {
docsDevEvControl,
docsDevEvThrottleAdminStatus,
docsDevEvThrottleThreshold,
docsDevEvThrottleInterval,
docsDevEvReporting,
docsDevEvFirstTime,
docsDevEvLastTime,
docsDevEvCounts,
docsDevEvLevel,
docsDevEvId,
docsDevEvText,
docsDevEvSyslogAddressType,
docsDevEvSyslogAddress,
docsDevEvThrottleThresholdExceeded
}
STATUS current
DESCRIPTION
"A collection of objects used to control and monitor
events. This group replaces docsDevEventGroup.
The event reporting mechanism, and more specifically
docsDevEvReporting, can be used to take advantage of
the event reporting features of RFC3413 and RFC3014."
::= { docsDevGroupsV2 6 }
docsDevFilterLLCGroup OBJECT-GROUP
OBJECTS {
docsDevFilterLLCUnmatchedAction,
docsDevFilterLLCStatus,
docsDevFilterLLCIfIndex,
docsDevFilterLLCProtocolType,
docsDevFilterLLCProtocol,
docsDevFilterLLCMatches
}
STATUS current
DESCRIPTION
"A collection of objects to specify link layer filters."
::= { docsDevGroupsV2 7 }
docsDevInetCpeGroup OBJECT-GROUP
OBJECTS {
docsDevCpeEnroll,
docsDevCpeIpMax,
docsDevCpeInetSource,
docsDevCpeInetRowStatus
}
STATUS current
DESCRIPTION
"A collection of objects used to control the number
and specific values of Internet (e.g., IPv4 and IPv6)
addresses allowed for associated Customer Premises
Equipment (CPE)."
::= { docsDevGroupsV2 8 }
END5. Acknowledgements ✨
Bestie, this doc is a production of the IPCDN Working Group 🫶 and it's a revision of RFC 2669, "Cable Device Management Information Base for DOCSIS-Compliant Cable Modems and Cable Modem Termination Systems" [RFC2669]. Mike St. Johns and Guenter Roeck were the editors of the earlier versions of this MIB module, and they absolutely slayed it 👑
The editor specifically wants to thank Howard Abramson, Eduardo Cardona, Andre Lejeune, Kevin Marez, Jean-Francois Mule, Greg Nakanishi, Pak Siripunkaw, Boris Tsekinovski, Randy Presuhn, Bert Wijnen, and Bill Yost for their contributions to this document 💖
5.1. Revision Descriptions 🎀
Okay, so this document has a bunch of revisions over RFC 2669, and here's the tea 🍓
- All IPv4 address objects were either deprecated and replaced or mirrored with IPv6 objects, where appropriate, following the guidelines of RFC 4001 [RFC4001]. In particular, docsDevCpeInetTable was added, and the docsDevFilterGroup objects were deprecated in favor of the DiffServ MIB 🦋
- Objects that were obviated by SNMPv3 and the SNMP Coexistence MIBs have been deprecated, e.g., docsDevNmAccessTable. It's giving "we don't need this anymore" energy 💅
- A new object, docsDevIgmpModeControl, has been added to control passive versus active IGMP modem operation 🌸
- A new object, docsDevMaxCpe, has been added to report the maximum number of CPEs granted network access across the CM ✨
- A new object, docsDevSwServerTransportProtocol, has been added to docsDevSoftware, and other object DESCRIPTIONs have been modified, to enable the use of either TFTP or HTTP for software downloads to the device 🧚
- A new object, docsDevEvThrottleThresholdExceeded, has been added to replace docsDevEvThrottleInhibited for simplification of event threshold management 🌈
- The docsDevEvReporting object has been modified to enable local logging to the internal volatile log, and not to the internal non-volatile log 💜
- Minor updates to the description text have been made to a number of objects to clarify their meaning 🙈
- The compliance statements were updated to reflect current requirements (including making the docsDevCpe objects optional) and split between CM and CMTS devices 🔥
- Text was added to indicate support of the SNMP Notification MIB [RFC3413] and Notification Log MIB [RFC3014] modules. Literally so iconic 😭
6. Security Considerations 🛡️
okay bestie, this part is SERIOUS 😭 This MIB module is for a system that gives metropolitan public internet access, so messing with it the wrong way could cause denial of service for a LOT of end-users 💀 Changing docsDevNmAccessTable, docsDevFilterLLCTable, docsDevFilterIpTable, docsDevFilterInetTable, and the elements of the docsDevCpe and docsDevCpeInetTable groups could let an end-user boost their own service levels, spoof their IP addresses, change which management stations are allowed, or affect other end-users in a good or bad way 🙈
It is recommended that implementers prevent the "tiny fragment" and "overlapping fragment" attacks for the IP filtering tables in this MIB module, as discussed in [RFC1858] and [RFC3128]. Preventing these attacks can be done with the following rules, when TCP source and/or destination port filtering is enabled:
- Admit all packets with fragment offset
>= 2. - Discard all packets with fragment offset
= 1, or with fragment offset= 0AND fragment payload length< 16. - Apply filtering rules to all packets with fragment offset
= 0.
This MIB module does not affect confidentiality of services on a cable modem system. [BPI] and [BPIPLUS] specify how the DOCSIS Baseline Privacy and Baseline Privacy Plus mechanisms for data transmission confidentiality are implemented 🔐
There are a bunch of management objects in here with a MAX-ACCESS clause of read-write and/or read-create, and those can be sensitive or vulnerable in some network environments 👀 Supporting SET operations in a non-secure environment without proper protection can have a negative effect on network operations. These are the tables and objects, and their sensitivity/vulnerability:
- Using docsDevNmAccessTable to specify management stations is only considered limited protection, and it does not protect against attacks that spoof the management station's IP address. Stronger mechanisms, such as SNMPv3 security, should be considered, where possible. Specifically, SNMPv3 USM [RFC3414] and VACM [RFC3415] MUST be used with any v3 agent that implements this MIB module.
- The CM may have its software changed by the actions of the management system, using a combination of these objects:
docsDevSwServer,docsDevSwFilename,docsDevSwAdminStatus,docsDevSwServerAddressType,docsDevSwServerAddress, anddocsDevSwServerTransportProtocol. An improper software download may cause serious vulnerabilities and make the management system lose the ability to control the cable modem 😱 A cable device SHOULD implement the code verification mechanisms of [BPIPLUS] to verify the source and integrity of downloaded software images. - The device may be reset by setting
docsDevResetNow = true(1). This makes the device reload its configuration files and eliminate all previous non-persistent network management settings. So it may be a vector for attacking the system. - Setting
docsDevEvThrottleAdminStatus = unconstrained(1)(which is also the DEFVAL) may cause a flood of traps, which can disrupt network service. Also,docsDevThrottleThresholdanddocsDevThrottleIntervalcould be set to high values that may cause a disruption in service. - Setting
docsDevDateTimeto an arbitrary (incorrect) value would only cause the device to record incorrect timestamps on many events and actions that rely on this object for reporting 🕰️ - Setting
docsDevEvControltoresetLog(1)will delete any event log history and could potentially hurt debugging and troubleshooting efforts. - Setting docsDevEvSyslog.
- Setting
docsDevEvReportingto enable syslog reporting, along with a redirect of the syslog server, could allow access to sensitive information on network devices. ModifyingdocsDevEvSyslog,docsDevEvSyslogAddressType, ordocsDevEvSyslogAddresscould allow a redirect of sensitive information. - Setting
docsDevFilterLLCnmatchedActionordocsDevFilterIpDefaultcould cause significant changes to default traffic filtering on a device. - Setting
docsDevCpeEnrolltoany(2)could cause thedocsDevFilterCPETableto be populated, which may not be the intended functionality. - Setting
docsDevCpeIpMaxto a value other than the one intended by the MSO may allow a user to provision more devices than the MSO would like. - Setting values in the docsDevNmAccess table can potentially give users a mechanism to use a local NMS device and manipulate other settings in the CM or CMTS.
- Setting values in the
docsDevFilterLLCanddocsDevFilterIPtables can allow or deny access to certain devices that the MSO does not want. - Setting
docsDevCpeStatusanddocsDevCpeInetRowStatusmay allow users to provision more devices than were intended by the MSO, or to provision different ones.
Some of the readable objects in this MIB module (that is, objects with a MAX-ACCESS other than not-accessible) may be sensitive or vulnerable in some network environments 🕵️ So it's important to control even GET access to these objects, and possibly to encrypt their values when sending them over the network via SNMP. These are the tables and objects, and their sensitivity/vulnerability:
- Rows from docsDevNmAccessTable may give attackers enough information to spoof management stations that have management access to the device.
- The
docsDevSwCurrentVersobject may hint at software vulnerabilities of the cable device. - The
docsDevFilterLLCTableanddocsDevFilterLLCTablemay provide clues for attacking the cable device and other subscriber devices.
SNMP versions prior to SNMPv3 did not include adequate security. Even if the network itself is secure (for example, by using IPsec), there is still no control over who on the secure network is allowed to GET and SET (read, change, create, delete) the objects in this MIB module 🚫
It is RECOMMENDED that implementers consider the security features provided by the SNMPv3 framework (see [RFC3410], section 8), including full support for the SNMPv3 cryptographic mechanisms (for authentication and privacy).
Further, deployment of SNMP versions prior to SNMPv3 is NOT RECOMMENDED. Instead, it is RECOMMENDED to deploy SNMPv3 and enable cryptographic security. It is then a customer/operator responsibility to make sure that the SNMP entity giving access to an instance of this MIB module is properly configured, so that only the principals (users) with legitimate rights can GET or SET (change, create, delete) the objects 🔒
7. IANA Considerations 🧾
The MIB module defined in this document uses the following IANA-assigned OBJECT IDENTIFIER values, which are recorded in the SMI Numbers registry:
Descriptor OBJECT IDENTIFIER value
---------- -----------------------
docsDevMIB { mib-2 69 }8. References 📚
8.1. Normative References ✨
okay bestie, these are the docs this spec leans on so hard it literally can't function without them 💅
- [BPI] SCTE Data Standards Subcommittee, "Data-Over-Cable Service Interface Specifications: DOCSIS 1.0 Baseline Privacy Interface Specification SCTE 22-2 2002", 2002,
<http://www.scte.org/standards/>. - [BPIPLUS] CableLabs, "Data-Over-Cable Service Interface Specifications: Baseline Privacy Plus Interface Specification CM-SP-BPI+_I12-050812", August 2005,
<http://www.cablemodem.com/specifications/>,<http://www.cablelabs.com/specifications/archives/>. - [ITU-T_J.112] ITU-T Recommendation J.112 (3/98), "Transmission Systems for Interactive Cable Television Services, J.112, International Telecommunications Union", March 1998,
<http://www.itu.int/ITU-T/studygroups/com09/>. - [MTA-PROV] CableLabs, "PacketCable(TM) 1.5 Specification: MTA Device Provisioning PKT-SP-PROV1.5-I02-050812", August 2005,
<http://www.packetcable.com/specifications/>,<http://www.cablelabs.com/specifications/archives/>. - [OSSI1.0] SCTE Data Standards Subcommittee, "Data-Over-Cable Service Interface Specification: DOCSIS 1.0 Operations Support System Interface (OSSI), SCTE 22-3 2002", 2002,
<http://www.scte.org/standards/>. - [OSSI1.1] SCTE Data Standards Subcommittee, "DOCSIS 1.1 Part 3: Operations Support System Interface ANSI/SCTE 23-3 2005", 2005,
<http://www.scte.org/standards/>. - [OSSI2.0] CableLabs, "Data-Over-Cable Service Interface Specifications: Operations Support System Interface Specification SP-OSSIv2.0-I09-050812", August 2005,
<http://www.cablemodem.com/specifications/>,<http://www.cablelabs.com/specifications/archives/>. - [RFC1350] Sollins, K., "The TFTP Protocol (Revision 2)", STD 33, RFC 1350, July 1992.
- [RFC4502] Waldbusser, S., "Remote Network Monitoring Management Information Base Version 2", RFC 4502, May 2006.
- [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997.
- [RFC2578] McCloghrie, K., Perkins, D., Schoenwaelder J., Case, J., Rose, M. and S. Waldbusser, "Structure of Management Information Version 2 (SMIv2)", STD 58, RFC 2578, April 1999.
- [RFC2579] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J., Rose, M. and S. Waldbusser , "Textual Conventions for SMIv2", STD 58, RFC 2579, April 1999.
- [RFC2580] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J., Rose, M. and S. Waldbusser, "Conformance Statements for SMIv2", STD 58, RFC 2580, April 1999.
- [RFC2616] Fielding, R., Gettys, J., Mogul, J., Frystyk, H., Masinter, L., Leach, P., and T. Berners-Lee, "Hypertext Transfer Protocol -- HTTP/1.1", RFC 2616, June 1999.
- [RFC2669] St. Johns, M., "DOCSIS Cable Device MIB Cable Device Management Information Base for DOCSIS compliant Cable Modems and Cable Modem Termination Systems", RFC 2669, August 1999.
- [RFC2863] McCloghrie, K. and F. Kastenholz, "The Interfaces Group MIB", RFC 2863, June 2000.
- [RFC3014] Kavasseri, R., "Notification Log MIB", RFC 3014, November 2000.
- [RFC3289] Baker, F., Chan, K., and A. Smith, "Management Information Base for the Differentiated Services Architecture", RFC 3289, May 2002.
- [RFC3411] Harrington, D., Presuhn, R., and B. Wijnen, "An Architecture for Describing Simple Network Management Protocol (SNMP) Management Frameworks", STD 62, RFC 3411, December 2002.
- [RFC3413] Levi, D., Meyer, P., and B. Stewart, "Simple Network Management Protocol (SNMP) Applications", STD 62, RFC 3413, December 2002.
- [RFC3414] Blumenthal, U. and B. Wijnen, "User-based Security Model (USM) for version 3 of the Simple Network Management Protocol (SNMPv3)", STD 62, RFC 3414, December 2002.
- [RFC3415] Wijnen, B., Presuhn, R., and K. McCloghrie, "View-based Access Control Model (VACM) for the Simple Network Management Protocol (SNMP)", STD 62, RFC 3415, December 2002.
- [RFC3418] Presuhn, R., "Management Information Base (MIB) for the Simple Network Management Protocol (SNMP)", STD 62, RFC 3418, December 2002.
- [RFC3584] Frye, R., Levi, D., Routhier, S., and B. Wijnen, "Coexistence between Version 1, Version 2, and Version 3 of the Internet-standard Network Management Framework", BCP 74, RFC 3584, August 2003.
- [RFC868] Postel, J. and K. Harrenstien, "Time Protocol", STD 26, RFC 868, May 1983.
- [RFC4001] Daniele, M., Haberman, B., Routhier, S., and J. Schoenwaelder, "Textual Conventions for Internet Network Addresses", RFC 4001, February 2005.
- [RFI1.0] SCTE Data Standards Subcommittee, "Data-Over-Cable Service Interface Specifications: DOCSIS 1.0 Radio Frequency Interface Specification SCTE 22-1 2002", 2002,
<http://www.scte.org/standards/>. - [RFI1.1] SCTE Data Standards Subcommittee, "DOCSIS 1.1 Part 1: Radio Frequency Interface ANSI/SCTE 23-1 2005", 2005,
<http://www.scte.org/standards/>. - [RFI2.0] CableLabs, "Data-Over-Cable Service Interface Specifications: Radio Frequency Interface Specification SP-RFI2.0-I11-060602", June 2006,
<http://www.cablemodem.com/specifications/>,<http://www.cablelabs.com/specifications/archives/>.
8.2. Informative References 🦋
these ones are the extra reading: good context, not strictly required 🧚
- [RFC1858] Ziemba, G., Reed, D., and P. Traina, "Security Considerations r IP Fragment Filtering", RFC 1858, October 1995.
- [RFC1945] Berners-Lee, T., Fielding, R., and H. Frystyk, "Hypertext Traner Protocol -- HTTP/1.0", RFC 1945, May 1996.
- [RFC3128] Miller, I., "Protection Against a Variant of the Tiny Fragment Attack (RFC 1858)", RFC 3128, June 2001.
- [RFC3164] Lonvick, C., "The BSD Syslog Protocol", RFC 3164, August 2001.
- [RFC3617] Lear, E., "Uniform Resource Identifier (URI) Scheme and Applicbility Statement for the Trivial File Transfer Protocol (TFTP)", RFC 3617, October 2003.
- [RFC4547] Ahmad, A. and G. Nakanishi, "Event Notification Management Information Base for Data over Cable Service Interface Specifications (DOCSIS) Compliant Cable Modems and Cable Modem Termination Systems", RFC 4547, June 2006.
- [RFC1224] Steinberg, L., "Techniques for managing asynchronously generated alerts", RFC 1224, May 1991.
- [RFC3410] Case, J., Mundy, R., Partain, D., and B. Stewart, "Introduction and Applicability Statements for Internet-Standard Management Framework", RFC 3410, December 2002.
- [RFC4036] Sawyer, W., "Management Information Base for Data Over Cable Service Interface Specification (DOCSIS) Cable Modem Termination Systems for Subscriber Management", RFC 4036, April 2005.
- [RFC4323] Patrick, M. and W. Murwin, "Data Over Cable System Interface Specification Quality of Service Management Information Base (DOCSIS-QoS MIB)", RFC 4323, January 2006.
- [MULPI3.0] CableLabs, "Data-Over-Cable Service Interface Specifications: DOCSIS 3.0 MAC and Upper Layer Protocols Interface Specification CM-SP-MULPIv3.0-I01-060804", August 2006,
<http://www.cablemodem.com/specifications/>,<http://www.cablelabs.com/specifications/archives/>.
Authors' Addresses 💖
Richard Woundy
Comcast Cable
27 Industrial Avenue
Chelmsford, MA 01824
USA
Phone: +1 978 244 4010
EMail: richard_woundy@cable.comcast.com
Kevin Marez
Motorola Corporation
6450 Sequence Drive
San Diego, CA 92121
USA
Phone: +1 858 404 3785
EMail: kevin.marez@motorola.comFull Copyright Statement ⭐
Copyright (C) The IETF Trust (2006).
This document is subject to the rights, licenses and restrictions contained in BCP 78, and except as set forth therein, the authors retain all their rights.
This document and the information contained herein are provided on an "AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY, THE IETF TRUST, AND THE INTERNET ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
Intellectual Property 🌈
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📦 where this page comes from
- ietf: rfc4639 2006-12
- 💖 girlified by claude-haiku-5-5 on : a language model's rewrite of the original, under its terms