RFC 2496
Definitions of Managed Object for the DS3/E3 Interface Type
Network Working Group, RFC 2496 🎀
Editor: D. Fowler, Newbridge Networks ✨ Category: Standards Track 🔥 Date: January 1999 📅 Obsoletes: RFC 1407 💅
Definitions of Managed Objects for the DS3/E3 Interface Type 🦋
Status of this Memo 📝
Okay so this doc is an Internet standards track protocol for the Internet community, and it's totally asking for discussion and suggestions so it can get even better 💖. If you want to know where this protocol stands in standardization, check the current edition of the "Internet Official Protocol Standards" (STD 1). Distribution of this memo is unlimited, so share it with your whole group chat 🫶.
Copyright Notice ©️
Copyright (C) The Internet Society (1999). All Rights Reserved. 🌸
Abstract 🧚
Bestie, this memo defines a piece of the Management Information Base (MIB) that network management protocols in the Internet community use 💜. It focuses on the objects you need to manage DS3 and E3 interfaces. It's a companion to the DS0 doc (RFC 2494 [25]), the DS1/E1/DS2/E2 doc (RFC 2495 [17]), and the work in progress SONET/SDH Interface Types ✨.
This memo writes a MIB module that is compliant to the SNMPv2 SMI, and it's semantically identical to the peer SNMPv1 definitions. Iconic consistency 👑.
Table of Contents 🗂️
1 The SNMP Management Framework ................................ 2
1.1 Changes from RFC1407 ....................................... 3
2 Overview ..................................................... 4
2.1 Use of ifTable for DS3 Layer ............................... 5
2.2 Usage Guidelines ........................................... 5
2.2.1 Usage of ifStackTable .................................... 5
2.2.2 Usage of Channelization for DS3, DS1, DS0 ................ 7
2.2.3 Usage of Channelization for DS3, DS2, DS1 ................ 7
2.2.4 Usage of Loopbacks ....................................... 8
2.3 Objectives of this MIB Module .............................. 9
2.4 DS3/E3 Terminology ......................................... 9
2.4.1 Error Events ............................................. 10
2.4.2 Performance Parameters ................................... 10
2.4.3 Performance Defects ...................................... 13
2.4.4 Other Terms .............................................. 15
3 Object Definitions ........................................... 15
3.1 The DS3/E3 Near End Group .................................. 16
3.1.1 The DS3/E3 Configuration Table ........................... 16
3.1.2 The DS3/E3 Current Table ................................. 25
3.1.3 The DS3/E3 Interval Table ................................ 28
3.1.4 The DS3/E3 Total ......................................... 31
3.2 The DS3 Far End Group ...................................... 34
3.2.1 The DS3 Far End Configuration ............................ 35
3.2.2 The DS3 Far End Current .................................. 37
3.2.3 The DS3 Far End Interval Table ........................... 39
3.2.4 The DS3 Far End Total .................................... 41
3.3 The DS3/E3 Fractional Table ................................ 43
3.4 The DS3 Trap Group ......................................... 46
3.5 Conformance Groups ......................................... 46
4 Appendix A - Use of dsx3IfIndex and dsx3LineIndex ............ 51
5 Appendix B - The delay approach to Unavialable Seconds. ..... 54
6 Intellectual Property ........................................ 56
7 Acknowledgments .............................................. 56
8 References ................................................... 56
9 Security Considerations ...................................... 58
10 Author's Address ............................................ 59
11 Full Copyright Statement .................................... 601. The SNMP Management Framework ✨
The SNMP Management Framework is giving five major components 💅:
- An overall architecture, described in RFC 2271 [1].
- Mechanisms for describing and naming objects and events for the purpose of management. The first version of this Structure of Management Information (SMI) is called SMIv1 and described in STD 16, RFC 1155 [2], STD 16, RFC 1212 [3] and RFC 1215 [4]. The second version, called SMIv2, is described in RFC 1902 [5], RFC 1903 [6] and RFC 1904 [7].
- Message protocols for transferring management information. The first version of the SNMP message protocol is called SNMPv1 and described in STD 15, RFC 1157 [8]. A second version of the SNMP message protocol, which is not an Internet standards track protocol, is called SNMPv2c and described in RFC 1901 [9] and RFC 1906 [10]. The third version of the message protocol is called SNMPv3 and described in RFC 1906 [10], RFC 2272 [11] and RFC 2274 [12].
- Protocol operations for accessing management information. The first set of protocol operations and associated PDU formats is described in STD 15, RFC 1157 [8]. A second set of protocol operations and associated PDU formats is described in RFC 1905 [13].
- A set of fundamental applications described in RFC 2273 [14] and the view-based access control mechanism described in RFC 2275 [15]. Managed objects are accessed via a virtual information store, termed the Management Information Base or MIB. Objects in the MIB are defined using the mechanisms defined in the SMI. This memo specifies a MIB module that is compliant to the SMIv2. A MIB conforming to the SMIv1 can be produced through the appropriate translations. The resulting translated MIB must be semantically equivalent, except where objects or events are omitted because no translation is possible (use of Counter64).
Some machine readable information in SMIv2 will be converted into textual descriptions in SMIv1 during the translation process. However, this loss of machine readable information is not considered to change the semantics of the MIB 🫶.
1.1. Changes from RFC1407 🔄
This MIB obsoletes RFC1407, and here's the tea on what changed 🍓:
- The Fractional Table has been deprecated
- This document uses SMIv2
- Values are given for ifTable and ifXTable
- Example usage of ifStackTable is included
- dsx3IfIndex has been deprecated
- The definition of valid intervals has been clarified for the case where the agent proxied for other devices. In particular, the treatment of missing intervals has been clarified.
- An inward loopback has been added.
- Additional lineStatus bits have been added for Near End in Unavailable Signal State, Carrier Equipment Out of Service, DS@ Payload AIS, and DS@ Performance Threshold
- A read-write line Length object has been added.
- Added a lineStatus last change, trap and enabler.
- Textual Conventions for statistics objects have been used.
- A new object, dsx3LoopbackStatus, has been introduced to reflect the loopbacks established on a DS3/E3 interface and the source to the requests. dsx3LoopbackConfig continues to be the desired loopback state while dsx3LoopbackStatus reflects the actual state.
- A dual loopback has been added to allow the setting of an inward loopback and a line loopback at the same time.
- An object has been added to indicate whether or not this is a channelized DS3/E3.
- A new object has been added to indicate which DS1 is to set for remote loopback.
2. Overview 🦋
These objects are used when the particular media being used to realize an interface is a DS3/E3 interface. Right now, this applies to these values of the ifType variable in the Internet-standard MIB:
ds3 (30)The DS3 definitions in here are based on the DS3 specifications in ANSI T1.102-1987, ANSI T1.107-1988, ANSI T1.107a-1990, and ANSI T1.404-1989 [8,9,9a,10]. The E3 definitions are based on the E3 specifications in CCITT G.751 [12] 💜.
2.1. Use of ifTable for DS3 Layer 🧩
Only the ifGeneralGroup needs to be supported, so don't overthink it 🙈.
ifTable Object Use for DS3 Layer
======================================================================
ifIndex Interface index.
ifDescr See interfaces MIB [5]
ifType ds3(30)
ifSpeed Speed of line rate
DS3 - 44736000
E3 - 34368000
ifPhysAddress The value of the Circuit Identifier.
If no Circuit Identifier has been assigned
this object should have an octet string
with zero length.
ifAdminStatus See interfaces MIB [5]
ifOperStatus See interfaces MIB [5]
ifLastChange See interfaces MIB [5]
ifName See interfaces MIB [5]
ifLinkUpDownTrapEnable Set to enabled(1).
ifHighSpeed Speed of line in Mega-bits per second
(either 45 or 34)
ifConnectorPresent Set to true(1) normally, except for
cases such as DS3/E3 over AAL1/ATM where
false(2) is appropriate2.2. Usage Guidelines 🎀
2.2.1. Usage of ifStackTable 🪜
The assignment of the index values could, for example, look like this 🌈:
ifIndex Description
1 Ethernet
2 Line#A Router
3 Line#B Router
4 Line#C Router
5 Line#D Router
6 Line#A CSU Router
7 Line#B CSU Router
8 Line#C CSU Router
9 Line#D CSU Router
10 Line#A CSU Network
11 Line#B CSU Network
12 Line#C CSU Network
13 Line#D CSU NetworkThe ifStackTable is then used to show the relationships between the various DS3 interfaces. It's giving relationship goals 💖:
ifStackTable Entries
HigherLayer LowerLayer
2 6
3 7
4 8
5 9
6 10
7 11
8 12
9 13If the CSU shelf is managed by itself by a local SNMP Agent, the situation would be identical, except the Ethernet and the 4 router interfaces are deleted. Interfaces would also be numbered from 1 to 8 🧚.
ifIndex Description
1 Line#A CSU Router
2 Line#B CSU Router
3 Line#C CSU Router
4 Line#D CSU Router
5 Line#A CSU Network
6 Line#B CSU Network
7 Line#C CSU Network
8 Line#D CSU NetworkifStackTable Entries
HigherLayer LowerLayer
1 5
2 6
3 7
4 82.2.2. Usage of Channelization for DS3, DS1, DS0 🎀
okay bestie, this is an example that shows how the channelization objects in the DS3, DS1, and DS0 MIBs work, so you can use them right 💅 E3 and E1 are basically the same deal, except the number of DS0s depends on the framing of the E1 🌸
Say a DS3 (with ifIndex 1) gets channelized into DS1s, with no DS2s in between. The object dsx3Channelization is set to enabledDs1. When it's set to enabledDS1, the agent creates 28 ifEntries of type DS1 🦋 If dsx3Channelization gets set to disabled, those DS1s get destroyed 💀
Now assume the DS1 entries in the ifTable are created in channel order, with ifIndex values 2 through 29. In the DS1 MIB, each ds1 gets an entry in the dsx1ChanMappingTable, and they look like this:
dsx1ChanMappingTable Entries
ifIndex dsx1Ds1ChannelNumber dsx1ChanMappedIfIndex
1 1 2
1 2 3
......
1 28 29The DS1s also get channelized into DS0s ✨ The object dsx1Channelization is set to enabledDS0 for each DS1, and there are 24 DS0s in the ifTable for each DS1. Assume those entries are created in channel order too, and the DS0s in the first DS1 get ifIndex values 30 through 53. In the DS0 MIB, each DS0 gets an entry in the dsx0ChanMappingTable like so:
dsx0ChanMappingTable Entries
ifIndex dsx0Ds0ChannelNumber dsx0ChanMappedIfIndex
2 1 30
2 2 31
......
2 24 532.2.3. Usage of Channelization for DS3, DS2, DS1 🧚
Another example, this time for the channelization objects in the DS3 and DS1 MIBs, to help you use them correctly 💖
Say a DS3 (with ifIndex 1) gets channelized into DS2s. The object dsx3Channelization is set to enabledDs2. There will be 7 DS2s (ifType of DS1) in the ifTable. Assume those entries are created in channel order with ifIndex values 2 through 8. In the DS1 MIB, each DS2 gets an entry in the dsx1ChanMappingTable, like this:
dsx1ChanMappingTable Entries
ifIndex dsx1Ds1ChannelNumber dsx1ChanMappedIfIndex
1 1 2
1 2 3
......
1 7 8Then the DS2s get channelized into DS1s 🫶 The object dsx1Channelization is set to enabledDS1 for each DS2. There will be 4 DS1s in the ifTable for each DS2. Assume the entries are created in channel order, so the DS1s in the first DS2 get ifIndex values 9 through 12, the DS1s in the second DS2 get 13 through 16, and so on. In the DS1 MIB, each DS1 gets an entry in the dsx1ChanMappingTable, like this:
dsx1ChanMappingTable Entries
ifIndex dsx1Ds1ChannelNumber dsx1ChanMappedIfIndex
2 1 9
2 2 10
2 3 11
2 4 12
3 1 13
3 2 14
...
8 4 362.2.4. Usage of Loopbacks 🔁
This section talks about how the loopback-related objects behave 🌈
The object dsx3LoopbackConfig represents the desired state of loopbacks on this interface. Using this object, a Manager can request:
LineLoopback
PayloadLoopback (if ESF framing)
InwardLoopback
DualLoopback (Line + Inward)
NoLoopbackThe remote end can also request loopbacks, either through the FDL channel if ESF, or inband if D4. The loopbacks that can be requested this way are:
LineLoopback
PayloadLoopback (if ESF framing)
NoLoopbackTo model the current state of loopbacks on a DS3 interface, the object dsx3LoopbackStatus defines which loopback currently applies to an interface. This object is a bitmap, and it has bits turned on that reflect the currently active loopbacks on the interface, as well as the source of those loopbacks 👑
Here are the restrictions and rules for loopbacks, so pay attention 👀
The far end cannot undo loopbacks set by a manager.
A manager can undo loopbacks set by the far end.
Both a line loopback and an inward loopback can be set at the same time. Only these two loopbacks can co-exist, and either one may be set by the manager or the far end. A LineLoopback request from the far end is incremental to an existing Inward loopback established by a manager. When a NoLoopback is received from the far end in this case, the InwardLoopback remains in place 🦋
2.3. Objectives of this MIB Module 🎯
There are loads of things that could be included in a MIB for DS3/E3 signals, like managing multiplexors, CSUs, DSUs, and the like 😭 But the goal of this document is to make it easier to manage all devices with DS3/E3 interfaces together. So the design decision was made up front to closely line up the MIB with the set of objects that can generally be read from DS3/E3 devices that are already deployed ✨
2.4. DS3/E3 Terminology 📖
The terminology this document uses for error conditions on a DS3 interface, as monitored by a DS3 device, is based on the late but not final draft of what became the ANSI T1.231 standard [11]. If the definition in this document doesn't match the definition in the ANSI T1.231 document, the implementer should follow the definition described in this document 💜
2.4.1. Error Events 💥
Bipolar Violation (BPV) Error Event
A bipolar violation error event, for B3ZS(HDB3)-coded signals, is the occurrence of a pulse of the same polarity as the previous pulse without being part of the zero substitution code, B3ZS(HDB3). For B3ZS(HDB3)-coded signals, a bipolar violation error event may also include other error patterns such as: three(four) or more consecutive zeros and incorrect polarity. (See T1.231 section 7.1.1.1.1)
Excessive Zeros (EXZ) Error Event
An EXZ is the occurrence of any zero string length equal to or greater than 3 for B3ZS, or greater than 4 for HDB3. (See T1.231 section 7.1.1.1.2)
Line Coding Violation (LCV) Error Event
This parameter is a count of both BPVs and EXZs occurring over the accumulation period. An EXZ increments the LCV by one regardless of the length of the zero string. (Also known as CV-L. See T1.231 section 7.4.1.1)
P-bit Coding Violation (PCV) Error Event
For all DS3 applications, a coding violation error event is a P-bit Parity Error event. A P-bit Parity Error event is the occurrence of a received P-bit code on the DS3 M-frame that is not identical to the corresponding locally-calculated code. (See T1.231 section 7.1.1.2.1)
C-bit Coding Violation (CCV) Error Event
For C-bit Parity and SYNTRAN DS3 applications, this is the count of coding violations reported via the C-bits. For C-bit Parity, it is a count of CP-bit parity errors occurring in the accumulation interval. For SYNTRAN, it is a count of CRC-9 errors occurring in the accumulation interval. (See T1.231 section 7.1.1.2.2) 🌸
2.4.2. Performance Parameters 💖
Okay so, every performance parameter gets tallied up in fifteen minute intervals, and an agent keeps up to 96 of them, which is 24 hours' worth 🕰️ Fewer than 96 intervals will be around if the agent got restarted within the last 24 hours. There's also a rolling 24-hour total for each performance parameter ✨
There's no requirement for an agent to lock its fifteen minute intervals to any wall clock, but some agents may line them up with quarter hours 🕐
Performance parameters are of types PerfCurrentCount, PerfIntervalCount and PerfTotalCount. All three of these textual conventions are Gauge32, and they're used because these objects are allowed to decrease 📉 Objects can go down when Unavailable Seconds happen across a fifteen minute interval boundary. See the Unavailable Seconds discussion later in this section 👀
Line Errored Seconds (LES) A Line Errored Second is a second in which one or more CV occurred OR one or more LOS defects. (Also known as ES-L. See T1.231 section 7.4.1.2) 🫶
P-bit Errored Seconds (PES) An PES is a second with one or more PCVs OR one or more Out of Frame defects OR a detected incoming AIS. This gauge is not incremented when UASs are counted. (Also known as ESP-P. See T1.231 section 7.4.2.2)
P-bit Severely Errored Seconds (PSES) A PSES is a second with 44 or more PCVs OR one or more Out of Frame defects OR a detected incoming AIS. This gauge is not incremented when UASs are counted. (Also known as SESP-P. See T1.231 section 7.4.2.5) 💀
C-bit Errored Seconds (CES) An CES is a second with one or more CCVs OR one or more Out of Frame defects OR a detected incoming AIS. This count is only for the SYNTRAN and C-bit Parity DS3 applications. This gauge is not incremented when UASs are counted. (Also known as ESCP-P. See T1.231 section 7.4.2.2)
C-bit Severely Errored Seconds (CSES) A CSES is a second with 44 or more CCVs OR one or more Out of Frame defects OR a detected incoming AIS. This count is only for the SYNTRAN and C-bit Parity DS3 applications. This gauge is not incremented when UASs are counted. (Also known as SESCP-P. See T1.231 section 7.4.2.5)
Severely Errored Framing Seconds (SEFS) A SEFS is a second with one or more Out of Frame defects OR a detected incoming AIS. This item is not incremented during unavailable seconds. (Also known as SAS-P. See T1.231 section 7.4.2.6) 🦋
Unavailable Seconds (UAS) UAS are calculated by counting the number of seconds that the interface is unavailable. The DS3 interface is said to be unavailable from the onset of 10 contiguous PSESs, or the onset of the condition leading to a failure (see Failure States). If the condition leading to the failure was immediately preceded by one or more contiguous PSESs, then the DS3 interface unavailability starts from the onset of these PSESs.
Once unavailable, and if no failure is present, the DS3 interface becomes available at the onset of 10 contiguous seconds with no PSESs. Once unavailable, and if a failure is present, the DS3 interface becomes available at the onset of 10 contiguous seconds with no PSESs, if the failure clearing time is less than or equal to 10 seconds. If the failure clearing time is more than 10 seconds, the DS3 interface becomes available at the onset of 10 contiguous seconds with no PSESs, or the onset period leading to the successful clearing condition, whichever occurs later.
With respect to the DS3 error counts, all counters are incremented while the DS3 interface is deemed available. While the interface is deemed unavailable, the only count that is incremented is UASs.
Note that this definition implies that the agent cannot determine until after a ten second interval has passed whether a given one-second interval belongs to available or unavailable time. If the agent chooses to update the various performance statistics in real time, then it must be prepared to retroactively reduce the PES, PSES, CES, and CSES counts by 10 and increase the UAS count by 10 when it determines that available time has been entered. It must also be prepared to adjust the PCV, CCV, and SEFS count as necessary, since these parameters are not accumulated during unavailable time. It must be similarly prepared to retroactively decrease the UAS count by 10 and increase the PES, CES, PCV, and CCV counts as necessary upon entering available time.
A special case exists when the 10 second period leading to available or unavailable time crosses a 900 second statistics window boundary, as the foregoing description implies that the PCV, CCV, PES, CES, PSES, CSEC, SEFS, and UAS counts for the PREVIOUS interval must be adjusted. In this case, successive GETs of the affected dsx3IntervalPSESs and dsx3IntervalUASs objects will return differing values if the first GET occurs during the first few seconds of the window. ⏳
The agent may instead choose to delay updates to the various statistics by 10 seconds in order to avoid retroactive adjustments to the counters. A way to do this is sketched in Appendix B. 🌸
In any case, a linkDown trap shall be sent only after the agent has determined for certain that the unavailable state has been entered, but the time on the trap will be that of the first UAS (i.e., 10 seconds earlier). A linkUp trap shall be handled similarly.
According to ANSI T1.231, unavailable time begins at the onset of 10 contiguous severely errored seconds. That is, unavailable time starts with the first of the 10 contiguous SESs. Also, while an interface is deemed unavailable, all counters for that interface are frozen except for the UAS count. It follows that an implementation which strictly complies with this standard must not increment any counters other than the UAS count, even temporarily, as a result of anything that happens during those 10 seconds.
Since changes in the signal state lag the data to which they apply by 10 seconds, an ANSI-compliant implementation must pass the one-second statistics through a 10-second delay line prior to updating any counters. That can be done by performing the following steps at the end of each one second interval.
i) Read near/far end CV counter and alarm status flags from the hardware.
ii) Accumulate the CV counts for the preceding second and compare them to the ES and SES threshold for the layer in question. Update the signal state and shift the one-second CV counts and ES/SES flags into the 10-element delay line. Note that far-end one-second statistics are to be flagged as "absent" during any second in which there is an incoming defect at the layer in question or at any lower layer.
iii) Update the current interval statistics using the signal state from the previous update cycle and the one-second CV counts and ES/SES flags shifted out of the 10-element delay line.
This approach is further described in Appendix B.
2.4.3. Performance Defects 🎀
Failure States: The Remote Alarm Indication (RAI) failure, in SYNTRAN applications, is declared after detecting the Yellow Alarm Signal on the alarm channel. See ANSI T1.107a-1990 [9a]. The Remote Alarm Indication failure, in C-bit Parity DS3 applications, is declared as soon as the presence of either one or two alarm signals is detected on the Far End Alarm Channel. See [9]. The Remote Alarm Indication failure may also be declared after detecting the far-end SEF/AIS defect (aka yellow). The Remote Alarm Indication failure is cleared as soon as the presence of any of the above alarms is removed.
Also, the incoming failure state is declared when a defect persists for at least 2-10 seconds. The defects are the following: Loss of Signal (LOS), an Out of Frame (OOF) or an incoming Alarm Indication Signal (AIS). The Failure State is cleared when the defect is absent for less than or equal to 20 seconds. 🚨
Far End SEF/AIS defect (aka yellow) A Far End SEF/AIS defect is the occurrence of the two X-bits in a M-frame set to zero. The Far End SEF/AIS defect is terminated when the two X-bits in a M-frame are set to one. (Also known as SASCP-PFE. See T1.231 section 7.4.4.2.6) 💜
Out of Frame (OOF) defect A DS3 OOF defect is detected when any three or more errors in sixteen or fewer consecutive F-bits occur within a DS3 M-frame. An OOF defect may also be called a Severely Errored Frame (SEF) defect. An OOF defect is cleared when reframe occurs. A DS3 Loss of Frame (LOF) failure is declared when the DS3 OOF defect is consistent for 2 to 10 seconds. The DS3 OOF defect ends when reframe occurs. The DS3 LOF failure is cleared when the DS3 OOF defect is absent for 10 to 20 seconds. (See T1.231 section 7.1.2.2.1)
An E3 OOF defect is detected when four consecutive frame alignment signals have been incorrectly received in their predicted positions in an E3 signal. E3 frame alignment occurs when the presence of three consecutive frame alignment signals has been detected. 🧚
Loss of Signal (LOS) defect The DS3 LOS defect is declared upon observing 175 +/- 75 contiguous pulse positions with no pulses of either positive or negative polarity. The DS3 LOS defect is terminated upon observing an average pulse density of at least 33% over a period of 175 +/- 75 contiguous pulse positions, starting with the receipt of a pulse. (See T1.231 section 7.1.2.1.1) 🌈
Alarm Indication Signal (AIS) defect The DS3 AIS is framed with "stuck stuffing." This implies that it has valid M-subframe alignment bits, M-frame alignment bits, and P bits. The information bits are set to a 1010... sequence, starting with a one (1) after each M-subframe alignment bit, M-frame alignment bit, X bit, P bit, and C bit. The C bits are all set to zero, giving what is called "stuck stuffing." The X bits are set to one.
The DS3 AIS defect is declared after DS3 AIS is present in contiguous M-frames for a time equal to or greater than T, where 0.2 ms <= T <= 100 ms. The DS3 AIS defect is terminated after AIS is absent in contiguous M-frames for a time equal to or greater than T. (See T1.231 section 7.1.2.2.3) 🔥
The E3 binary content of the AIS is nominally a continuous stream of ones. AIS detection and the application of consequent actions should be completed within a time limit of 1 ms. ⭐
2.4.4. Other Terms 🧚
okay so two more terms to know, bestie 💅
Circuit Identifier 🎀 This is a character string that the circuit vendor sets. It's super handy when you're on the phone with the vendor trying to figure out what's broken, because you can just say the ID and they know exactly which circuit you mean 🫶
Proxy 🦋 In this doc, "proxy" means an application that gets SNMP messages and answers them on behalf of the devices that actually have the DS3/E3 interfaces. The proxy might already have the interface info saved in its own local database, so it doesn't always need to pass the request along to the real interface 🧠 But here's the tea 🍵 there will be stretches of time when the proxy isn't talking to the DS3/E3 interfaces at all. During those gaps, the proxy might not have the newest configuration info, and it has probably missed collecting some statistics. And when statistics get missed, the data in the interval table comes out invalid 😭 so keep that in mind!
3. Object Definitions ✨
Here's the MIB module itself, bestie. Look at all those objects 😍
DS3-MIB DEFINITIONS ::= BEGIN
IMPORTS
MODULE-IDENTITY, OBJECT-TYPE,
NOTIFICATION-TYPE, transmission FROM SNMPv2-SMI
DisplayString, TimeStamp, TruthValue FROM SNMPv2-TC
MODULE-COMPLIANCE, OBJECT-GROUP,
NOTIFICATION-GROUP FROM SNMPv2-CONF
InterfaceIndex FROM IF-MIB
PerfCurrentCount, PerfIntervalCount,
PerfTotalCount FROM PerfHist-TC-MIB;
ds3 MODULE-IDENTITY
LAST-UPDATED "9808012130Z"
ORGANIZATION "IETF Trunk MIB Working Group"
CONTACT-INFO
" David Fowler
Postal: Newbridge Networks Corporation
600 March Road
Kanata, Ontario, Canada K2K 2E6
Tel: +1 613 591 3600
Fax: +1 613 599 3667
E-mail: davef@newbridge.com"
DESCRIPTION
"The is the MIB module that describes
DS3 and E3 interfaces objects."
::= { transmission 30 }
-- The DS3/E3 Near End Group
-- The DS3/E3 Near End Group consists of four tables:
-- DS3/E3 Configuration
-- DS3/E3 Current
-- DS3/E3 Interval
-- DS3/E3 Total
-- the DS3/E3 Configuration Table
dsx3ConfigTable OBJECT-TYPE
SYNTAX SEQUENCE OF Dsx3ConfigEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The DS3/E3 Configuration table."
::= { ds3 5 }
dsx3ConfigEntry OBJECT-TYPE
SYNTAX Dsx3ConfigEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"An entry in the DS3/E3 Configuration table."
INDEX { dsx3LineIndex }
::= { dsx3ConfigTable 1 }
Dsx3ConfigEntry ::=
SEQUENCE {
dsx3LineIndex InterfaceIndex,
dsx3IfIndex InterfaceIndex,
dsx3TimeElapsed INTEGER,
dsx3ValidIntervals INTEGER,
dsx3LineType INTEGER,
dsx3LineCoding INTEGER,
dsx3SendCode INTEGER,
dsx3CircuitIdentifier DisplayString,
dsx3LoopbackConfig INTEGER,
dsx3LineStatus INTEGER,
dsx3TransmitClockSource INTEGER,
dsx3InvalidIntervals INTEGER,
dsx3LineLength INTEGER,
dsx3LineStatusLastChange TimeStamp,
dsx3LineStatusChangeTrapEnable INTEGER,
dsx3LoopbackStatus INTEGER,
dsx3Channelization INTEGER,
dsx3Ds1ForRemoteLoop INTEGER
}
dsx3LineIndex OBJECT-TYPE
SYNTAX InterfaceIndex
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This object should be made equal to ifIndex. The
next paragraph describes its previous usage.
Making the object equal to ifIndex allows propoer
use of ifStackTable.
Previously, this object was the identifier of a
DS3/E3 Interface on a managed device. If there is
an ifEntry that is directly associated with this
and only this DS3/E3 interface, it should have the
same value as ifIndex. Otherwise, number the
dsx3LineIndices with an unique identifier
following the rules of choosing a number that is
greater than ifNumber and numbering the inside
interfaces (e.g., equipment side) with even
numbers and outside interfaces (e.g, network side)
with odd numbers."
::= { dsx3ConfigEntry 1 }
dsx3IfIndex OBJECT-TYPE
SYNTAX InterfaceIndex
MAX-ACCESS read-only
STATUS deprecated
DESCRIPTION
"This value for this object is equal to the value
of ifIndex from the Interfaces table of MIB II
(RFC 1213)."
::= { dsx3ConfigEntry 2 }
dsx3TimeElapsed OBJECT-TYPE
SYNTAX INTEGER (0..899)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of seconds that have elapsed since the
beginning of the near end current error-
measurement period. If, for some reason, such as
an adjustment in the system's time-of-day clock,
the current interval exceeds the maximum value,
the agent will return the maximum value."
::= { dsx3ConfigEntry 3 }
dsx3ValidIntervals OBJECT-TYPE
SYNTAX INTEGER (0..96)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of previous near end intervals for
which data was collected. The value will be
96 unless the interface was brought online within
the last 24 hours, in which case the value will be
the number of complete 15 minute near end
intervals since the interface has been online. In
the case where the agent is a proxy, it is
possible that some intervals are unavailable. In
this case, this interval is the maximum interval
number for which data is available."
::= { dsx3ConfigEntry 4 }
dsx3LineType OBJECT-TYPE
SYNTAX INTEGER {
dsx3other(1),
dsx3M23(2),
dsx3SYNTRAN(3),
dsx3CbitParity(4),
dsx3ClearChannel(5),
e3other(6),
e3Framed(7),
e3Plcp(8)
}
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"This variable indicates the variety of DS3 C-bit
or E3 application implementing this interface. The
type of interface affects the interpretation of
the usage and error statistics. The rate of DS3
is 44.736 Mbps and E3 is 34.368 Mbps. The
dsx3ClearChannel value means that the C-bits are
not used except for sending/receiving AIS.
The values, in sequence, describe:
TITLE: SPECIFICATION:
dsx3M23 ANSI T1.107-1988 [9]
dsx3SYNTRAN ANSI T1.107-1988 [9]
dsx3CbitParity ANSI T1.107a-1990 [9a]
dsx3ClearChannel ANSI T1.102-1987 [8]
e3Framed CCITT G.751 [12]
e3Plcp ETSI T/NA(91)18 [13]."
::= { dsx3ConfigEntry 5 }
dsx3LineCoding OBJECT-TYPE
SYNTAX INTEGER {
dsx3Other(1),
dsx3B3ZS(2),
e3HDB3(3)
}
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"This variable describes the variety of Zero Code
Suppression used on this interface, which in turn
affects a number of its characteristics.
dsx3B3ZS and e3HDB3 refer to the use of specified
patterns of normal bits and bipolar violations
which are used to replace sequences of zero bits
of a specified length."
::= { dsx3ConfigEntry 6 }
dsx3SendCode OBJECT-TYPE
SYNTAX INTEGER {
dsx3SendNoCode(1),
dsx3SendLineCode(2),
dsx3SendPayloadCode(3),
dsx3SendResetCode(4),
dsx3SendDS1LoopCode(5),
dsx3SendTestPattern(6)
}
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"This variable indicates what type of code is
being sent across the DS3/E3 interface by the
device. (These are optional for E3 interfaces.)
Setting this variable causes the interface to
begin sending the code requested.
The values mean:
dsx3SendNoCode
sending looped or normal data
dsx3SendLineCode
sending a request for a line loopback
dsx3SendPayloadCode
sending a request for a payload loopback
(i.e., all DS1/E1s in a DS3/E3 frame)
dsx3SendResetCode
sending a loopback deactivation request
dsx3SendDS1LoopCode
requesting to loopback a particular DS1/E1
within a DS3/E3 frame. The DS1/E1 is
indicated in dsx3Ds1ForRemoteLoop.
dsx3SendTestPattern
sending a test pattern."
::= { dsx3ConfigEntry 7 }
dsx3CircuitIdentifier OBJECT-TYPE
SYNTAX DisplayString (SIZE (0..255))
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"This variable contains the transmission vendor's
circuit identifier, for the purpose of
facilitating troubleshooting."
::= { dsx3ConfigEntry 8 }
dsx3LoopbackConfig OBJECT-TYPE
SYNTAX INTEGER {
dsx3NoLoop(1),
dsx3PayloadLoop(2),
dsx3LineLoop(3),
dsx3OtherLoop(4),
dsx3InwardLoop(5),
dsx3DualLoop(6)
}
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"This variable represents the desired loopback
configuration of the DS3/E3 interface.
The values mean:
dsx3NoLoop
Not in the loopback state. A device that is
not capable of performing a loopback on
the interface shall always return this as
its value.okay so we're still deep in the loopback config menu bestie 🎀 the last one is the loopback types list, and then the line status bitmap is giving full main character energy 💅
dsx3PayloadLoop
The received signal at this interface is looped
through the device. Typically the received signal
is looped back for retransmission after it has
passed through the device's framing function.
dsx3LineLoop
The received signal at this interface does not
go through the device (minimum penetration) but
is looped back out.
dsx3OtherLoop
Loopbacks that are not defined here.
dsx3InwardLoop
The sent signal at this interface is looped back
through the device.
dsx3DualLoop
Both dsx1LineLoop and dsx1InwardLoop will be
active simultaneously."
::= { dsx3ConfigEntry 9 }okay so the loopback types are payload, line, other, inward, and dual 🦋 the dual one is literally two loopbacks running at the same time, iykyk 🫶
dsx3LineStatus OBJECT-TYPE
SYNTAX INTEGER (1..4095)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This variable indicates the Line Status of the
interface. It contains loopback state information
and failure state information. The dsx3LineStatus
is a bit map represented as a sum, therefore, it
can represent multiple failures and a loopback
(see dsx3LoopbackConfig object for the type of
loopback) simultaneously. The dsx3NoAlarm must be
set if and only if no other flag is set.
If the dsx3loopbackState bit is set, the loopback
in effect can be determined from the
dsx3loopbackConfig object.
The various bit positions are:
1 dsx3NoAlarm No alarm present
2 dsx3RcvRAIFailure Receiving Yellow/Remote
Alarm Indication
4 dsx3XmitRAIAlarm Transmitting Yellow/Remote
Alarm Indication
8 dsx3RcvAIS Receiving AIS failure state
16 dsx3XmitAIS Transmitting AIS
32 dsx3LOF Receiving LOF failure state
64 dsx3LOS Receiving LOS failure state
128 dsx3LoopbackState Looping the received signal
256 dsx3RcvTestCode Receiving a Test Pattern
512 dsx3OtherFailure any line status not defined
here
1024 dsx3UnavailSigState Near End in Unavailable Signal
State
2048 dsx3NetEquipOOS Carrier Equipment Out of Service"
::= { dsx3ConfigEntry 10 }ngl dsx3LineStatus is a bitmap, so it's basically a sum of flags 🧚 it can show several failures plus a loopback all at once. the rule is the dsx3NoAlarm bit only shows up when literally nothing else is on 💀
dsx3TransmitClockSource OBJECT-TYPE
SYNTAX INTEGER {
loopTiming(1),
localTiming(2),
throughTiming(3)
}
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"The source of Transmit Clock.
loopTiming indicates that the recovered receive clock
is used as the transmit clock.
localTiming indicates that a local clock source is used
or that an external clock is attached to the box
containing the interface.
throughTiming indicates that transmit clock is derived
from the recovered receive clock of another DS3
interface."
::= { dsx3ConfigEntry 11 }so the clock source has three flavours: loopTiming reuses the recovered receive clock, localTiming uses a local or external clock, and throughTiming borrows the recovered clock from a different DS3 interface 🌸
dsx3InvalidIntervals OBJECT-TYPE
SYNTAX INTEGER (0..96)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of intervals in the range from 0 to
dsx3ValidIntervals for which no data is
available. This object will typically be zero
except in cases where the data for some intervals
are not available (e.g., in proxy situations)."
::= { dsx3ConfigEntry 12 }
dsx3LineLength OBJECT-TYPE
SYNTAX INTEGER (0..64000)
UNITS "meters"
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"The length of the ds3 line in meters. This
object provides information for line build out
circuitry if it exists and can use this object to
adjust the line build out."
::= { dsx3ConfigEntry 13 }
dsx3LineStatusLastChange OBJECT-TYPE
SYNTAX TimeStamp
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The value of MIB II's sysUpTime object at the
time this DS3/E3 entered its current line status
state. If the current state was entered prior to
the last re-initialization of the proxy-agent,
then this object contains a zero value."
::= { dsx3ConfigEntry 14 }
dsx3LineStatusChangeTrapEnable OBJECT-TYPE
SYNTAX INTEGER {
enabled(1),
disabled(2)
}
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"Indicates whether dsx3LineStatusChange traps
should be generated for this interface."
DEFVAL { disabled }
::= { dsx3ConfigEntry 15 }the interval count is 0..96 and it's zero unless some data is missing, like in proxy situations 👑 the line length is in meters so the box can adjust its build out 📏 and the trap toggle is disabled by default, so you have to turn it on yourself 🙈
dsx3LoopbackStatus OBJECT-TYPE
SYNTAX INTEGER (1..127)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This variable represents the current state of the
loopback on the DS3 interface. It contains
information about loopbacks established by a
manager and remotely from the far end.
The dsx3LoopbackStatus is a bit map represented as
a sum, therefore is can represent multiple
loopbacks simultaneously.
The various bit positions are:
1 dsx3NoLoopback
2 dsx3NearEndPayloadLoopback
4 dsx3NearEndLineLoopback
8 dsx3NearEndOtherLoopback
16 dsx3NearEndInwardLoopback
32 dsx3FarEndPayloadLoopback
64 dsx3FarEndLineLoopback"
::= { dsx3ConfigEntry 16 }
dsx3Channelization OBJECT-TYPE
SYNTAX INTEGER {
disabled(1),
enabledDs1(2),
enabledDs2(3)
}
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"Indicates whether this ds3/e3 is channelized or
unchannelized. The value of enabledDs1 indicates
that this is a DS3 channelized into DS1s. The
value of enabledDs3 indicated that this is a DS3
channelized into DS2s. Setting this object will
cause the creation or deletion of DS2 or DS1
entries in the ifTable. "
::= { dsx3ConfigEntry 17 }
dsx3Ds1ForRemoteLoop OBJECT-TYPE
SYNTAX INTEGER (0..29)
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"Indicates which ds1/e1 on this ds3/e3 will be
indicated in the remote ds1 loopback request. A
value of 0 means no DS1 will be looped. A value
of 29 means all ds1s/e1s will be looped."
::= { dsx3ConfigEntry 18 }the loopback status is a bitmap too 🍓 it tracks loopbacks set by a manager and ones coming from the far end, so you can see near end and far end loops side by side. channelization is off, DS1, or DS2, and flipping it creates or deletes entries in the ifTable 💖 and dsx3Ds1ForRemoteLoop picks which DS1 gets looped, with 0 meaning none and 29 meaning all of them 🧚
-- the DS3/E3 Current Table
dsx3CurrentTable OBJECT-TYPE
SYNTAX SEQUENCE OF Dsx3CurrentEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The DS3/E3 current table contains various
statistics being collected for the current 15
minute interval."
::= { ds3 6 }
dsx3CurrentEntry OBJECT-TYPE
SYNTAX Dsx3CurrentEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"An entry in the DS3/E3 Current table."
INDEX { dsx3CurrentIndex }
::= { dsx3CurrentTable 1 }
Dsx3CurrentEntry ::=
SEQUENCE {
dsx3CurrentIndex InterfaceIndex,
dsx3CurrentPESs PerfCurrentCount,
dsx3CurrentPSESs PerfCurrentCount,
dsx3CurrentSEFSs PerfCurrentCount,
dsx3CurrentUASs PerfCurrentCount,
dsx3CurrentLCVs PerfCurrentCount,
dsx3CurrentPCVs PerfCurrentCount,
dsx3CurrentLESs PerfCurrentCount,
dsx3CurrentCCVs PerfCurrentCount,
dsx3CurrentCESs PerfCurrentCount,
dsx3CurrentCSESs PerfCurrentCount
}
dsx3CurrentIndex OBJECT-TYPE
SYNTAX InterfaceIndex
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The index value which uniquely identifies the
DS3/E3 interface to which this entry is
applicable. The interface identified by a
particular value of this index is the same
interface as identified by the same value an
dsx3LineIndex object instance."
::= { dsx3CurrentEntry 1 }
dsx3CurrentPESs OBJECT-TYPE
SYNTAX PerfCurrentCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The counter associated with the number of P-bit
Errored Seconds."
::= { dsx3CurrentEntry 2 }
dsx3CurrentPSESs OBJECT-TYPE
SYNTAX PerfCurrentCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The counter associated with the number of P-bit
Severely Errored Seconds."
::= { dsx3CurrentEntry 3 }
dsx3CurrentSEFSs OBJECT-TYPE
SYNTAX PerfCurrentCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The counter associated with the number of
Severely Errored Framing Seconds."
::= { dsx3CurrentEntry 4 }
dsx3CurrentUASs OBJECT-TYPE
SYNTAX PerfCurrentCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The counter associated with the number of
Unavailable Seconds."
::= { dsx3CurrentEntry 5 }
dsx3CurrentLCVs OBJECT-TYPE
SYNTAX PerfCurrentCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The counter associated with the number of Line
Coding Violations."
::= { dsx3CurrentEntry 6 }
dsx3CurrentPCVs OBJECT-TYPE
SYNTAX PerfCurrentCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The counter associated with the number of P-bit
Coding Violations."
::= { dsx3CurrentEntry 7 }
dsx3CurrentLESs OBJECT-TYPE
SYNTAX PerfCurrentCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Line Errored Seconds."
::= { dsx3CurrentEntry 8 }
dsx3CurrentCCVs OBJECT-TYPE
SYNTAX PerfCurrentCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of C-bit Coding Violations."
::= { dsx3CurrentEntry 9 }
dsx3CurrentCESs OBJECT-TYPE
SYNTAX PerfCurrentCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of C-bit Errored Seconds."
::= { dsx3CurrentEntry 10 }and that's the current table bestie 🦋 it's basically a live scoreboard for the current 15 minute interval, with P-bit, line, and C-bit errors all getting their own counters 📊 every one of them is a PerfCurrentCount and they all hang off the same interface index, so no mixing them up 🫶
dsx3CurrentCSESs OBJECT-TYPE
SYNTAX PerfCurrentCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of C-bit Severely Errored Seconds."
::= { dsx3CurrentEntry 11 }
-- the DS3/E3 Interval Table
dsx3IntervalTable OBJECT-TYPE
SYNTAX SEQUENCE OF Dsx3IntervalEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The DS3/E3 Interval Table contains various
statistics collected by each DS3/E3 Interface over
the previous 24 hours of operation. The past 24
hours are broken into 96 completed 15 minute
intervals. Each row in this table represents one
such interval (identified by dsx3IntervalNumber)
and for one specific interface (identifed by
dsx3IntervalIndex)."
::= { ds3 7 }
dsx3IntervalEntry OBJECT-TYPE
SYNTAX Dsx3IntervalEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"An entry in the DS3/E3 Interval table."
INDEX { dsx3IntervalIndex, dsx3IntervalNumber }
::= { dsx3IntervalTable 1 }
Dsx3IntervalEntry ::=
SEQUENCE {
dsx3IntervalIndex InterfaceIndex,
dsx3IntervalNumber INTEGER,
dsx3IntervalPESs PerfIntervalCount,
dsx3IntervalPSESs PerfIntervalCount,
dsx3IntervalSEFSs PerfIntervalCount,
dsx3IntervalUASs PerfIntervalCount,
dsx3IntervalLCVs PerfIntervalCount,
dsx3IntervalPCVs PerfIntervalCount,
dsx3IntervalLESs PerfIntervalCount,
dsx3IntervalCCVs PerfIntervalCount,
dsx3IntervalCESs PerfIntervalCount,
dsx3IntervalCSESs PerfIntervalCount,
dsx3IntervalValidData TruthValue
}
dsx3IntervalIndex OBJECT-TYPE
SYNTAX InterfaceIndex
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The index value which uniquely identifies the
DS3/E3 interface to which this entry is
applicable. The interface identified by a
particular value of this index is the same
interface as identified by the same value an
dsx3LineIndex object instance."
::= { dsx3IntervalEntry 1 }
dsx3IntervalNumber OBJECT-TYPE
SYNTAX INTEGER (1..96)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"A number between 1 and 96, where 1 is the most
recently completed 15 minute interval and 96 is
the 15 minutes interval completed 23 hours and 45
minutes prior to interval 1."
::= { dsx3IntervalEntry 2 }
dsx3IntervalPESs OBJECT-TYPE
SYNTAX PerfIntervalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The counter associated with the number of P-bit
Errored Seconds."
::= { dsx3IntervalEntry 3 }
dsx3IntervalPSESs OBJECT-TYPE
SYNTAX PerfIntervalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The counter associated with the number of P-bit
Severely Errored Seconds."
::= { dsx3IntervalEntry 4 }
dsx3IntervalSEFSs OBJECT-TYPE
SYNTAX PerfIntervalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The counter associated with the number of
Severely Errored Framing Seconds."
::= { dsx3IntervalEntry 5 }
dsx3IntervalUASs OBJECT-TYPE
SYNTAX PerfIntervalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The counter associated with the number of
Unavailable Seconds. This object may decrease if
the occurance of unavailable seconds occurs across
an inteval boundary."
::= { dsx3IntervalEntry 6 }
dsx3IntervalLCVs OBJECT-TYPE
SYNTAX PerfIntervalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The counter associated with the number of Line
Coding Violations."
::= { dsx3IntervalEntry 7 }
dsx3IntervalPCVs OBJECT-TYPE
SYNTAX PerfIntervalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The counter associated with the number of P-bit
Coding Violations."
::= { dsx3IntervalEntry 8 }
dsx3IntervalLESs OBJECT-TYPE
SYNTAX PerfIntervalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Line Errored Seconds (BPVs or
illegal zero sequences)."
::= { dsx3IntervalEntry 9 }
dsx3IntervalCCVs OBJECT-TYPE
SYNTAX PerfIntervalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of C-bit Coding Violations."
::= { dsx3IntervalEntry 10 }
dsx3IntervalCESs OBJECT-TYPE
SYNTAX PerfIntervalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of C-bit Errored Seconds."
::= { dsx3IntervalEntry 11 }
dsx3IntervalCSESs OBJECT-TYPE
SYNTAX PerfIntervalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of C-bit Severely Errored Seconds."
::= { dsx3IntervalEntry 12 }
dsx3IntervalValidData OBJECT-TYPE
SYNTAX TruthValue
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This variable indicates if the data for this
interval is valid."
::= { dsx3IntervalEntry 13 }okay the interval table is giving 📊✨ 96 little 15-minute snapshots of the last 24 hours, bestie, and each one is its own row 💜
-- the DS3/E3 Total
dsx3TotalTable OBJECT-TYPE
SYNTAX SEQUENCE OF Dsx3TotalEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The DS3/E3 Total Table contains the cumulative
sum of the various statistics for the 24 hour
period preceding the current interval."
::= { ds3 8 }
dsx3TotalEntry OBJECT-TYPE
SYNTAX Dsx3TotalEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"An entry in the DS3/E3 Total table."
INDEX { dsx3TotalIndex }
::= { dsx3TotalTable 1 }
Dsx3TotalEntry ::=
SEQUENCE {
dsx3TotalIndex InterfaceIndex,
dsx3TotalPESs PerfTotalCount,
dsx3TotalPSESs PerfTotalCount,
dsx3TotalSEFSs PerfTotalCount,
dsx3TotalUASs PerfTotalCount,
dsx3TotalLCVs PerfTotalCount,
dsx3TotalPCVs PerfTotalCount,
dsx3TotalLESs PerfTotalCount,
dsx3TotalCCVs PerfTotalCount,
dsx3TotalCESs PerfTotalCount,
dsx3TotalCSESs PerfTotalCount
}
dsx3TotalIndex OBJECT-TYPE
SYNTAX InterfaceIndex
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The index value which uniquely identifies the
DS3/E3 interface to which this entry is
applicable. The interface identified by a
particular value of this index is the same
interface as identified by the same value an
dsx3LineIndex object instance."
::= { dsx3TotalEntry 1 }
dsx3TotalPESs OBJECT-TYPE
SYNTAX PerfTotalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The counter associated with the number of P-bit
Errored Seconds, encountered by a DS3 interface in
the previous 24 hour interval. Invalid 15 minute
intervals count as 0."
::= { dsx3TotalEntry 2 }
dsx3TotalPSESs OBJECT-TYPE
SYNTAX PerfTotalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The counter associated with the number of P-bit
Severely Errored Seconds, encountered by a DS3
interface in the previous 24 hour interval.
Invalid 15 minute intervals count as 0."
::= { dsx3TotalEntry 3 }
dsx3TotalSEFSs OBJECT-TYPE
SYNTAX PerfTotalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The counter associated with the number of
Severely Errored Framing Seconds, encountered by a
DS3/E3 interface in the previous 24 hour interval.
Invalid 15 minute intervals count as 0."
::= { dsx3TotalEntry 4 }
dsx3TotalUASs OBJECT-TYPE
SYNTAX PerfTotalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The counter associated with the number of
Unavailable Seconds, encountered by a DS3
interface in the previous 24 hour interval.
Invalid 15 minute intervals count as 0."
::= { dsx3TotalEntry 5 }
dsx3TotalLCVs OBJECT-TYPE
SYNTAX PerfTotalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The counter associated with the number of Line
Coding Violations encountered by a DS3/E3
interface in the previous 24 hour interval.
Invalid 15 minute intervals count as 0."
::= { dsx3TotalEntry 6 }
dsx3TotalPCVs OBJECT-TYPE
SYNTAX PerfTotalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The counter associated with the number of P-bit
Coding Violations, encountered by a DS3 interface
in the previous 24 hour interval. Invalid 15
minute intervals count as 0."
::= { dsx3TotalEntry 7 }
dsx3TotalLESs OBJECT-TYPE
SYNTAX PerfTotalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of Line Errored Seconds (BPVs or
illegal zero sequences) encountered by a DS3/E3
interface in the previous 24 hour interval.
Invalid 15 minute intervals count as 0."
::= { dsx3TotalEntry 8 }
dsx3TotalCCVs OBJECT-TYPE
SYNTAX PerfTotalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of C-bit Coding Violations encountered
by a DS3 interface in the previous 24 hour
interval. Invalid 15 minute intervals count as 0."
::= { dsx3TotalEntry 9 }
dsx3TotalCESs OBJECT-TYPE
SYNTAX PerfTotalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of C-bit Errored Seconds encountered
by a DS3 interface in the previous 24 hour
interval. Invalid 15 minute intervals count as 0."
::= { dsx3TotalEntry 10 }the total table is the 24-hour glow-up summary 🎀💅 every counter just keeps adding up, periodt 🌸
Okay bestie, we're in the DS3 Far End group now, and it's giving data from the other side of the line 🦋✨ The tables here hold what the far end reports back through the C-bits, which is lowkey the coolest part of this whole MIB 💅
First up is the total count of C-bit severely errored seconds, which covers the previous 24 hour interval 📊
dsx3TotalCSESs OBJECT-TYPE
SYNTAX PerfTotalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of C-bit Severely Errored Seconds
encountered by a DS3 interface in the previous 24
hour interval. Invalid 15 minute intervals count
as 0."
::= { dsx3TotalEntry 11 }Now the Far End Group itself. The comments say it's made of four tables: Far End Configuration, Far End Current, Far End Interval, and Far End Total 🎀
-- The DS3 Far End Group
-- The DS3 Far End Group consists of four tables :
-- DS3 Far End Configuration
-- DS3 Far End Current
-- DS3 Far End Interval
-- DS3 Far End Total
-- The DS3 Far End Configuration Table
dsx3FarEndConfigTable OBJECT-TYPE
SYNTAX SEQUENCE OF Dsx3FarEndConfigEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The DS3 Far End Configuration Table contains
configuration information reported in the C-bits
from the remote end."
::= { ds3 9 }
dsx3FarEndConfigEntry OBJECT-TYPE
SYNTAX Dsx3FarEndConfigEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"An entry in the DS3 Far End Configuration table."
INDEX { dsx3FarEndLineIndex }
::= { dsx3FarEndConfigTable 1 }
Dsx3FarEndConfigEntry ::=
SEQUENCE {
dsx3FarEndLineIndex InterfaceIndex,
dsx3FarEndEquipCode DisplayString,
dsx3FarEndLocationIDCode DisplayString,
dsx3FarEndFrameIDCode DisplayString,
dsx3FarEndUnitCode DisplayString,
dsx3FarEndFacilityIDCode DisplayString
}
dsx3FarEndLineIndex OBJECT-TYPE
SYNTAX InterfaceIndex
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The index value which uniquely identifies the DS3
interface to which this entry is applicable. The
interface identified by a particular value of this
index is the same interface as identified by the
same value an dsx3LineIndex object instance."
::= { dsx3FarEndConfigEntry 1 }The configuration objects are the ID codes that get sent inside the Path Identification Message. Equipment, location, frame, unit and facility each have their own length limit, so they're easy to tell apart 🌸
dsx3FarEndEquipCode OBJECT-TYPE
SYNTAX DisplayString (SIZE (0..10))
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"This is the Far End Equipment Identification code
that describes the specific piece of equipment.
It is sent within the Path Identification
Message."
::= { dsx3FarEndConfigEntry 2 }
dsx3FarEndLocationIDCode OBJECT-TYPE
SYNTAX DisplayString (SIZE (0..11))
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"This is the Far End Location Identification code
that describes the specific location of the
equipment. It is sent within the Path
Identification Message."
::= { dsx3FarEndConfigEntry 3 }
dsx3FarEndFrameIDCode OBJECT-TYPE
SYNTAX DisplayString (SIZE (0..10))
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"This is the Far End Frame Identification code
that identifies where the equipment is located
within a building at a given location. It is sent
within the Path Identification Message."
::= { dsx3FarEndConfigEntry 4 }
dsx3FarEndUnitCode OBJECT-TYPE
SYNTAX DisplayString (SIZE (0..6))
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"This is the Far End code that identifies the
equipment location within a bay. It is sent
within the Path Identification Message."
::= { dsx3FarEndConfigEntry 5 }
dsx3FarEndFacilityIDCode OBJECT-TYPE
SYNTAX DisplayString (SIZE (0..38))
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"This code identifies a specific Far End DS3 path.
It is sent within the Path Identification
Message."
::= { dsx3FarEndConfigEntry 6 }Next is the Far End Current table, which collects stats for the current 15 minute interval, pulled from the far end block error code in the C-bits 🧚
-- The DS3 Far End Current
dsx3FarEndCurrentTable OBJECT-TYPE
SYNTAX SEQUENCE OF Dsx3FarEndCurrentEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The DS3 Far End Current table contains various
statistics being collected for the current 15
minute interval. The statistics are collected
from the far end block error code within the C-
bits."
::= { ds3 10 }
dsx3FarEndCurrentEntry OBJECT-TYPE
SYNTAX Dsx3FarEndCurrentEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"An entry in the DS3 Far End Current table."
INDEX { dsx3FarEndCurrentIndex }
::= { dsx3FarEndCurrentTable 1 }
Dsx3FarEndCurrentEntry ::=
SEQUENCE {
dsx3FarEndCurrentIndex InterfaceIndex,
dsx3FarEndTimeElapsed INTEGER,
dsx3FarEndValidIntervals INTEGER,
dsx3FarEndCurrentCESs PerfCurrentCount,
dsx3FarEndCurrentCSESs PerfCurrentCount,
dsx3FarEndCurrentCCVs PerfCurrentCount,
dsx3FarEndCurrentUASs PerfCurrentCount,
dsx3FarEndInvalidIntervals INTEGER
}
dsx3FarEndCurrentIndex OBJECT-TYPE
SYNTAX InterfaceIndex
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The index value which uniquely identifies the DS3
interface to which this entry is applicable. The
interface identified by a particular value of this
index is identical to the interface identified by
the same value of dsx3LineIndex."
::= { dsx3FarEndCurrentEntry 1 }
dsx3FarEndTimeElapsed OBJECT-TYPE
SYNTAX INTEGER (0..899)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of seconds that have elapsed since the
beginning of the far end current error-measurement
period. If, for some reason, such as an
adjustment in the system's time-of-day clock, the
current interval exceeds the maximum value, the
agent will return the maximum value."
::= { dsx3FarEndCurrentEntry 2 }
dsx3FarEndValidIntervals OBJECT-TYPE
SYNTAX INTEGER (0..96)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of previous far end intervals for
which data was collected. The value will be
96 unless the interface was brought online within
the last 24 hours, in which case the value will be
the number of complete 15 minute far end intervals
since the interface has been online."
::= { dsx3FarEndCurrentEntry 3 }
dsx3FarEndCurrentCESs OBJECT-TYPE
SYNTAX PerfCurrentCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The counter associated with the number of Far Far
End C-bit Errored Seconds."
::= { dsx3FarEndCurrentEntry 4 }
dsx3FarEndCurrentCSESs OBJECT-TYPE
SYNTAX PerfCurrentCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The counter associated with the number of Far End
C-bit Severely Errored Seconds."
::= { dsx3FarEndCurrentEntry 5 }
dsx3FarEndCurrentCCVs OBJECT-TYPE
SYNTAX PerfCurrentCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The counter associated with the number of Far End
C-bit Coding Violations reported via the far end
block error count."
::= { dsx3FarEndCurrentEntry 6 }
dsx3FarEndCurrentUASs OBJECT-TYPE
SYNTAX PerfCurrentCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The counter associated with the number of Far End
unavailable seconds."
::= { dsx3FarEndCurrentEntry 7 }
dsx3FarEndInvalidIntervals OBJECT-TYPE
SYNTAX INTEGER (0..96)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of intervals in the range from 0 to
dsx3FarEndValidIntervals for which no data is
available. This object will typically be zero
except in cases where the data for some intervals
are not available (e.g., in proxy situations)."
::= { dsx3FarEndCurrentEntry 8 }Last stop for this chunk is the Far End Interval table, which keeps the stats from each of the previous 24 hours in 96 completed 15 minute slices ⏰
-- The DS3 Far End Interval Table
dsx3FarEndIntervalTable OBJECT-TYPE
SYNTAX SEQUENCE OF Dsx3FarEndIntervalEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The DS3 Far End Interval Table contains various
statistics collected by each DS3 interface over
the previous 24 hours of operation. The past 24
hours are broken into 96 completed 15 minute
intervals."
::= { ds3 11 }
dsx3FarEndIntervalEntry OBJECT-TYPE
SYNTAX Dsx3FarEndIntervalEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"An entry in the DS3 Far End Interval table."
INDEX { dsx3FarEndIntervalIndex,
dsx3FarEndIntervalNumber }
::= { dsx3FarEndIntervalTable 1 }
Dsx3FarEndIntervalEntry ::=
SEQUENCE {
dsx3FarEndIntervalIndex InterfaceIndex,
dsx3FarEndIntervalNumber INTEGER,
dsx3FarEndIntervalCESs PerfIntervalCount,
dsx3FarEndIntervalCSESs PerfIntervalCount,
dsx3FarEndIntervalCCVs PerfIntervalCount,
dsx3FarEndIntervalUASs PerfIntervalCount,
dsx3FarEndIntervalValidData TruthValue
}
dsx3FarEndIntervalIndex OBJECT-TYPE
SYNTAX InterfaceIndex
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The index value which uniquely identifies the DS3
interface to which this entry is applicable. The
interface identified by a particular value of this
index is identical to the interface identified by
the same value of dsx3LineIndex."
::= { dsx3FarEndIntervalEntry 1 }
dsx3FarEndIntervalNumber OBJECT-TYPE
SYNTAX INTEGER (1..96)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"A number between 1 and 96, where 1 is the most
recently completed 15 minute interval and 96 is
the 15 minutes interval completed 23 hours and 45
minutes prior to interval 1."
::= { dsx3FarEndIntervalEntry 2 }
dsx3FarEndIntervalCESs OBJECT-TYPE
SYNTAX PerfIntervalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTIONOkay so the far end interval counters are next, and bestie, they're giving detailed 💅 Each one counts a different kind of far end problem in a 15 minute slot 🦋
"The counter associated with the number of Far End
C-bit Errored Seconds encountered by a DS3
interface in one of the previous 96, individual 15
minute, intervals. In the case where the agent is
a proxy and data is not available, return
noSuchInstance."
::= { dsx3FarEndIntervalEntry 3 }
dsx3FarEndIntervalCSESs OBJECT-TYPE
SYNTAX PerfIntervalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The counter associated with the number of Far End
C-bit Severely Errored Seconds."
::= { dsx3FarEndIntervalEntry 4 }
dsx3FarEndIntervalCCVs OBJECT-TYPE
SYNTAX PerfIntervalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The counter associated with the number of Far End
C-bit Coding Violations reported via the far end
block error count."
::= { dsx3FarEndIntervalEntry 5 }
dsx3FarEndIntervalUASs OBJECT-TYPE
SYNTAX PerfIntervalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The counter associated with the number of Far End
unavailable seconds."
::= { dsx3FarEndIntervalEntry 6 }
dsx3FarEndIntervalValidData OBJECT-TYPE
SYNTAX TruthValue
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This variable indicates if the data for this
interval is valid."
::= { dsx3FarEndIntervalEntry 7 }Lowkey the ValidData one is the "is this slot even trustworthy?" check ✨ 🫶
Next up is the DS3 Far End Total 🌸 This one is the running tally for the whole previous 24 hours, not just one 15 minute slot, so it's giving big picture energy 🧚
-- The DS3 Far End Total
dsx3FarEndTotalTable OBJECT-TYPE
SYNTAX SEQUENCE OF Dsx3FarEndTotalEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The DS3 Far End Total Table contains the
cumulative sum of the various statistics for the
24 hour period preceding the current interval."
::= { ds3 12 }
dsx3FarEndTotalEntry OBJECT-TYPE
SYNTAX Dsx3FarEndTotalEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"An entry in the DS3 Far End Total table."
INDEX { dsx3FarEndTotalIndex }
::= { dsx3FarEndTotalTable 1 }
Dsx3FarEndTotalEntry ::=
SEQUENCE {
dsx3FarEndTotalIndex InterfaceIndex,
dsx3FarEndTotalCESs PerfTotalCount,
dsx3FarEndTotalCSESs PerfTotalCount,
dsx3FarEndTotalCCVs PerfTotalCount,
dsx3FarEndTotalUASs PerfTotalCount
}
dsx3FarEndTotalIndex OBJECT-TYPE
SYNTAX InterfaceIndex
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The index value which uniquely identifies the DS3
interface to which this entry is applicable. The
interface identified by a particular value of this
index is identical to the interface identified by
the same value of dsx3LineIndex."
::= { dsx3FarEndTotalEntry 1 }
dsx3FarEndTotalCESs OBJECT-TYPE
SYNTAX PerfTotalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The counter associated with the number of Far End
C-bit Errored Seconds encountered by a DS3
interface in the previous 24 hour interval.
Invalid 15 minute intervals count as 0."
::= { dsx3FarEndTotalEntry 2 }
dsx3FarEndTotalCSESs OBJECT-TYPE
SYNTAX PerfTotalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The counter associated with the number of Far End
C-bit Severely Errored Seconds encountered by a
DS3 interface in the previous 24 hour interval.
Invalid 15 minute intervals count as 0."
::= { dsx3FarEndTotalEntry 3 }
dsx3FarEndTotalCCVs OBJECT-TYPE
SYNTAX PerfTotalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The counter associated with the number of Far End
C-bit Coding Violations reported via the far end
block error count encountered by a DS3 interface
in the previous 24 hour interval. Invalid 15
minute intervals count as 0."
::= { dsx3FarEndTotalEntry 4 }
dsx3FarEndTotalUASs OBJECT-TYPE
SYNTAX PerfTotalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The counter associated with the number of Far End
unavailable seconds encountered by a DS3 interface
in the previous 24 hour interval. Invalid 15
minute intervals count as 0."
::= { dsx3FarEndTotalEntry 5 }Every total counter has that same "invalid 15 minute intervals count as 0" line, so the totals never get hit by the bad slots 🙈 Iconic consistency 👑
Now the DS3/E3 Fractional Table 🍓 The RFC is clear that this one is deprecated, and it says to use ifStackTable instead. It was optional, and it was built for splitting a DS3/E3 into channels for different data streams. The example in the description is a whole vibe, so I kept every line of it exactly as written 🎀
-- the DS3/E3 Fractional Table
-- This table is deprecated.
dsx3FracTable OBJECT-TYPE
SYNTAX SEQUENCE OF Dsx3FracEntry
MAX-ACCESS not-accessible
STATUS deprecated
DESCRIPTION
"This table is deprecated in favour of using
ifStackTable.
Implementation of this table was optional. It was
designed for those systems dividing a DS3/E3 into
channels containing different data streams that
are of local interest.
The DS3/E3 fractional table identifies which
DS3/E3 channels associated with a CSU are being
used to support a logical interface, i.e., an
entry in the interfaces table from the Internet-
standard MIB.
For example, consider a DS3 device with 4 high
speed links carrying router traffic, a feed for
voice, a feed for video, and a synchronous channel
for a non-routed protocol. We might describe the
allocation of channels, in the dsx3FracTable, as
follows:
dsx3FracIfIndex.2. 1 = 3 dsx3FracIfIndex.2.15 = 4
dsx3FracIfIndex.2. 2 = 3 dsx3FracIfIndex.2.16 = 6
dsx3FracIfIndex.2. 3 = 3 dsx3FracIfIndex.2.17 = 6
dsx3FracIfIndex.2. 4 = 3 dsx3FracIfIndex.2.18 = 6
dsx3FracIfIndex.2. 5 = 3 dsx3FracIfIndex.2.19 = 6
dsx3FracIfIndex.2. 6 = 3 dsx3FracIfIndex.2.20 = 6
dsx3FracIfIndex.2. 7 = 4 dsx3FracIfIndex.2.21 = 6
dsx3FracIfIndex.2. 8 = 4 dsx3FracIfIndex.2.22 = 6
dsx3FracIfIndex.2. 9 = 4 dsx3FracIfIndex.2.23 = 6
dsx3FracIfIndex.2.10 = 4 dsx3FracIfIndex.2.24 = 6
dsx3FracIfIndex.2.11 = 4 dsx3FracIfIndex.2.25 = 6
dsx3FracIfIndex.2.12 = 5 dsx3FracIfIndex.2.26 = 6
dsx3FracIfIndex.2.13 = 5 dsx3FracIfIndex.2.27 = 6
dsx3FracIfIndex.2.14 = 5 dsx3FracIfIndex.2.28 = 6
For dsx3M23, dsx3 SYNTRAN, dsx3CbitParity, and
dsx3ClearChannel there are 28 legal channels,
numbered 1 throug h 28.
For e3Framed there are 16 legal channels, numbered
1 through 16. The channels (1..16) correspond
directly to the equivalently numbered time-slots."
::= { ds3 13 }
dsx3FracEntry OBJECT-TYPE
SYNTAX Dsx3FracEntry
MAX-ACCESS not-accessible
STATUS deprecated
DESCRIPTION
"An entry in the DS3 Fractional table."
INDEX { dsx3FracIndex, dsx3FracNumber }
::= { dsx3FracTable 1 }
Dsx3FracEntry ::=
SEQUENCE {
dsx3FracIndex INTEGER,
dsx3FracNumber INTEGER,
dsx3FracIfIndex INTEGER
}
dsx3FracIndex OBJECT-TYPE
SYNTAX INTEGER (1..'7fffffff'h)
MAX-ACCESS read-only
STATUS deprecated
DESCRIPTION
"The index value which uniquely identifies the
DS3 interface to which this entry is applicable
The interface identified by a particular value
of this index is the same interface as
identified by the same value an dsx3LineIndex
object instance."
::= { dsx3FracEntry 1 }
dsx3FracNumber OBJECT-TYPE
SYNTAX INTEGER (1..31)
MAX-ACCESS read-only
STATUS deprecated
DESCRIPTION
"The channel number for this entry."
::= { dsx3FracEntry 2 }
dsx3FracIfIndex OBJECT-TYPE
SYNTAX INTEGER (1..'7fffffff'h)
MAX-ACCESS read-write
STATUS deprecated
DESCRIPTION
"An index value that uniquely identifies an
interface. The interface identified by a
particular value of this index is the same
interface as identified by the same value an
ifIndex object instance. If no interface is
currently using a channel, the value should be
zero. If a single interface occupies more than
one time slot, that ifIndex value will be found
in multiple time slots."
::= { dsx3FracEntry 3 }The frac table is all deprecated, so it's kind of a retro fit, but the example is still a serious mood 🧚✨
Traps time 🔔 Here's the line status change notification. The trap fires when dsx3LineStatus changes, and an NMS can use it to kick off polls. Also, if the change is a lower level one (like ds1), the RFC says no traps get sent for the lower level 🦋
-- Ds3 TRAPS
ds3Traps OBJECT IDENTIFIER ::= { ds3 15 }
dsx3LineStatusChange NOTIFICATION-TYPE
OBJECTS { dsx3LineStatus,
dsx3LineStatusLastChange }
STATUS current
DESCRIPTION
"A dsx3LineStatusChange trap is sent when the
value of an instance of dsx3LineStatus changes. It
can be utilized by an NMS to trigger polls. When
the line status change results in a lower level
line status change (i.e. ds1), then no traps for
the lower level are sent."
::= { ds3Traps 0 1 }Last bit for this part is the conformance and compliance stuff 🎀 The groups get their own OID branches, and the compliance statement says which groups are mandatory and which are optional. It also says that write access for dsx3LineType and dsx3LineCoding isn't required, so those two only need read-only access (MIN-ACCESS read-only) 💜
-- conformance information
ds3Conformance OBJECT IDENTIFIER ::= { ds3 14 }
ds3Groups OBJECT IDENTIFIER ::= {
ds3Conformance 1 } ds3Compliances OBJECT
IDENTIFIER ::= { ds3Conformance 2 }
-- compliance statements
ds3Compliance MODULE-COMPLIANCE
STATUS current
DESCRIPTION
"The compliance statement for DS3/E3
interfaces."
MODULE -- this module
MANDATORY-GROUPS { ds3NearEndConfigGroup,
ds3NearEndStatisticsGroup }
GROUP ds3FarEndGroup
DESCRIPTION
"Implementation of this group is optional for all
systems that attach to a DS3 Interface. However,
only C-bit Parity and SYNTRAN DS3 applications
have the capability (option) of providing this
information."
GROUP ds3NearEndOptionalConfigGroup
DESCRIPTION
"Implementation of this group is optional for all
systems that attach to a DS3 interface."
OBJECT dsx3LineType
MIN-ACCESS read-only
DESCRIPTION
"Write access for the line type is not required."
OBJECT dsx3LineCoding
MIN-ACCESS read-only
DESCRIPTION
"Write access for the line coding is not
required." OBJECT dsx3SendCode
MIN-ACCESS read-only
DESCRIPTION
"Write access for the send code is not required."
OBJECT dsx3LoopbackConfig
MIN-ACCESS read-only
DESCRIPTION
"Write access for loopbacks is not required."
OBJECT dsx3TransmitClockSource
MIN-ACCESS read-only
DESCRIPTION
"Write access for the transmit clock source is not
required."
OBJECT dsx3LineLength
MIN-ACCESS read-only
DESCRIPTION
"Write access for the line length is not
required."
OBJECT dsx3Channelization
MIN-ACCESS read-only
DESCRIPTION
"Write access for the channelization is not
required."
::= { ds3Compliances 1 }
-- units of conformance
ds3NearEndConfigGroup OBJECT-GROUP
OBJECTS { dsx3LineIndex,
dsx3TimeElapsed,
dsx3ValidIntervals,
dsx3LineType,
dsx3LineCoding,
dsx3SendCode,
dsx3CircuitIdentifier,
dsx3LoopbackConfig,
dsx3LineStatus,
dsx3TransmitClockSource,
dsx3InvalidIntervals,
dsx3LineLength,
dsx3LoopbackStatus,
dsx3Channelization,
dsx3Ds1ForRemoteLoop }
STATUS current
DESCRIPTION
"A collection of objects providing configuration
information applicable to all DS3/E3 interfaces."
::= { ds3Groups 1 }
ds3NearEndStatisticsGroup OBJECT-GROUP
OBJECTS { dsx3CurrentIndex,
dsx3CurrentPESs,
dsx3CurrentPSESs,
dsx3CurrentSEFSs,
dsx3CurrentUASs,
dsx3CurrentLCVs,
dsx3CurrentPCVs,
dsx3CurrentLESs,
dsx3CurrentCCVs,
dsx3CurrentCESs,
dsx3CurrentCSESs,
dsx3IntervalIndex,
dsx3IntervalNumber,
dsx3IntervalPESs,
dsx3IntervalPSESs,
dsx3IntervalSEFSs,
dsx3IntervalUASs,
dsx3IntervalLCVs,
dsx3IntervalPCVs,
dsx3IntervalLESs,
dsx3IntervalCCVs,
dsx3IntervalCESs,
dsx3IntervalCSESs,
dsx3IntervalValidData,
dsx3TotalIndex,
dsx3TotalPESs,
dsx3TotalPSESs,
dsx3TotalSEFSs,
dsx3TotalUASs,
dsx3TotalLCVs,
dsx3TotalPCVs,
dsx3TotalLESs,
dsx3TotalCCVs,
dsx3TotalCESs,
dsx3TotalCSESs }
STATUS current
DESCRIPTION
"A collection of objects providing statistics
information applicable to all DS3/E3 interfaces."
::= { ds3Groups 2 }
ds3FarEndGroup OBJECT-GROUP
OBJECTS { dsx3FarEndLineIndex,
dsx3FarEndEquipCode,
dsx3FarEndLocationIDCode,
dsx3FarEndFrameIDCode,
dsx3FarEndUnitCode,
dsx3FarEndFacilityIDCode,
dsx3FarEndCurrentIndex,
dsx3FarEndTimeElapsed,
dsx3FarEndValidIntervals,
dsx3FarEndCurrentCESs,
dsx3FarEndCurrentCSESs,
dsx3FarEndCurrentCCVs,
dsx3FarEndCurrentUASs,
dsx3FarEndInvalidIntervals,
dsx3FarEndIntervalIndex,
dsx3FarEndIntervalNumber,
dsx3FarEndIntervalCESs,
dsx3FarEndIntervalCSESs,
dsx3FarEndIntervalCCVs,
dsx3FarEndIntervalUASs,
dsx3FarEndIntervalValidData,
dsx3FarEndTotalIndex,
dsx3FarEndTotalCESs,
dsx3FarEndTotalCSESs,
dsx3FarEndTotalCCVs,
dsx3FarEndTotalUASs }
STATUS current
DESCRIPTION
"A collection of objects providing remote
configuration and statistics information
applicable to C-bit Parity and SYNTRAN DS3
interfaces."
::= { ds3Groups 3 }
ds3DeprecatedGroup OBJECT-GROUP
OBJECTS { dsx3IfIndex,
dsx3FracIndex,
dsx3FracNumber,
dsx3FracIfIndex }
STATUS deprecated
DESCRIPTION
"A collection of obsolete objects that may be
implemented for backwards compatibility."
::= { ds3Groups 4 }
ds3NearEndOptionalConfigGroup OBJECT-GROUP
OBJECTS { dsx3LineStatusLastChange,
dsx3LineStatusChangeTrapEnable }
STATUS current
DESCRIPTION
"A collection of objects that may be implemented
on DS3/E3 interfaces."
::= { ds3Groups 5 }
ds3NearEndOptionalTrapGroup NOTIFICATION-GROUP
NOTIFICATIONS { dsx3LineStatusChange }
STATUS current
DESCRIPTION
"A collection of notifications that may be
implemented on DS3/E3 interfaces."
::= { ds3Groups 6 }
END4. Appendix A - Use of dsx3IfIndex and dsx3LineIndex ✨
This appendix is all about documenting how dsx3IfIndex and dsx3LineIndex were used before, and making it crystal clear how the dsx3LineIndex from rfc1407 relates to the dsx3LineIndex in this document. 💅
Here's the old and new definitions side by side, plus how they connect:
[New Definition]: "This object should be made equal to ifIndex. The
next paragraph describes its previous usage. Making the object equal
to ifIndex allows proper use of ifStackTable.[Old Definition]: "this object is the identifier of a DS3/E3
Interface on a managed device. If there is an ifEntry that is
directly associated with this and only this DS3/E3 interface, it
should have the same value as ifIndex. Otherwise, number the
dsx3LineIndices with an unique identifier following the rules of
choosing a number that is greater than ifNumber and numbering the
inside interfaces (e.g., equipment side) with even numbers and
outside interfaces (e.g, network side) with odd numbers."When the "Old Definition" was created, my understanding was that it was written this way so a manager could treat the value _as if_ it were an ifIndex, i.e. the value would either be: 1) an ifIndex value or 2) a value that was guaranteed to be different from all valid ifIndex values. 🧚
The new definition is a subset of that definition, i.e. the value is always an ifIndex value. ✨
Here's Section 3.1 from rfc1407, quoted exactly:
Different physical configurations for the support of SNMP with DS3/E3 equipment exist. To accommodate these scenarios, two different indices for DS3/E3 interfaces are introduced in this MIB. These indices are dsx3IfIndex and dsx3LineIndex. External interface scenario: the SNMP Agent represents all managed DS3/E3 lines as external interfaces (for example, an Agent residing on the device supporting DS3/E3 interfaces directly): For this scenario, all interfaces are assigned an integer value equal to ifIndex, and the following applies: ifIndex=dsx3IfIndex=dsx3LineIndex for all interfaces. The dsx3IfIndex column of the DS3/E3 Configuration table relates each DS3/E3 interface to its corresponding interface (ifIndex) in the Internet-standard MIB (MIB-II STD 17, RFC1213). External&Internal interface scenario: the SNMP Agents resides on an host external from the device supporting DS3/E3 interfaces (e.g., a router). The Agent represents both the host and the DS3/E3 device. The index dsx3LineIndex is used to not only represent the DS3/E3 interfaces external from the host/DS3/E3-device combination, but also the DS3/E3 interfaces connecting the host and the DS3/E3 device. The index dsx3IfIndex is always equal to ifIndex. Example: A shelf full of CSUs connected to a Router. An SNMP Agent residing on the router proxies for itself and the CSU. The router has also an Ethernet interface:
+-----+
| | |
| | | +---------------------+
|E | | 44.736 MBPS | ds3 M13 Line#A | ds3 C-bit Parity
|t | R |---------------+ - - - - - - - - - +------>
|h | | | |
|e | O | 44.736 MBPS | ds3 M13 Line#B | ds3 C-bit Parity
|r | |---------------+ - - - - - - - - - - +------>
|n | U | | |
|e | | 44.736 MBPS | ds3 M13 Line#C | ds3 C-bit Parity
|t | T |---------------+ - - - -- -- - - - - +------>
| | | | |
|-----| E | 44.736 MBPS | ds3 M13 Line#D | ds3 C-bit Parity
| | |---------------+ - - - - -- - - - - +------>
| | R | |_____________________|
| | |
| +-----+The assignment of the index values could for example be:
ifIndex (= dsx3IfIndex) dsx3LineIndex
1 NA NA (Ethernet)
2 Line#A Router Side 6
2 Line#A Network Side 7
3 Line#B Router Side 8
3 Line#B Network Side 9
4 Line#C Router Side 10
4 Line#C Network Side 11
5 Line#D Router Side 12
5 Line#D Network Side 13For this example, ifNumber is equal to 5. Note the following description of dsx3LineIndex: the dsx3LineIndex identifies a DS3/E3 Interface on a managed device. If there is an ifEntry that is directly associated with this and only this DS3/E3 interface, it should have the same value as ifIndex. Otherwise, number the dsx3LineIndices with an unique identifier following the rules of choosing a number greater than ifNumber and numbering inside interfaces (e.g., equipment side) with even numbers and outside interfaces (e.g, network side) with odd numbers.
If the CSU shelf is managed by itself by a local SNMP Agent, the situation would be:
ifIndex (= dsx3IfIndex) dsx3LineIndex
1 Line#A Network Side 1
2 Line#A RouterSide 2
3 Line#B Network Side 3
4 Line#B RouterSide 4
5 Line#C Network Side 5
6 Line#C Router Side 6
7 Line#D Network Side 7
8 Line#D Router Side 85. Appendix B - The delay approach to Unavialable Seconds ✨
okay so this is how the delay approach works 🫶 It's shown below for a DS3 C-Bit parity application, but the same rules would apply for the other interfaces this MIB covers. The best part is that the statistical counters are always correctly updated, even though they lag real time by 10 seconds 💅 At the end of each 15 minute interval, the current interval counts get transferred into the most recent interval entry, and every interval shifts up one position. The oldest one gets discarded if there's no room. Then the current interval counts start over from zero. BUT the signal state calculation doesn't restart at each interval boundary. Signal state info is kept across boundaries, no cap 👑
+----------------------------------------------------------------+
| READ COUNTERS & STATUS INFO FROM HARDWARE |
| |
|BPV EXZ LOS PCV CCV AIS SEF OOF LOF FEBE RAI |
+----------------------------------------------------------------+
| | | | | | | | | | |
| | | | | | | | | | |
V V V V V V V V V V V
+----------------------------------------------------------------+
| ACCUM ONE-SEC STATS, CHK ERR THRESHOLDS, & UPDT SIGNAL STATE |
| |
|<------------- NEAR END ---------------->| |<---- FAR END ----->|
| |
|LCV LES PCV CCV PES CES PSES CSES SEFS A/U CCV CES CSES SEFS A/U|
+----------------------------------------------------------------+
| | | | | | | | | | | | | | |
| | | | | | | | | | | | | | |
V V V V V V V V V | V V V V |
+--------------------------------------+ | +-----------------+ |
| ONE-SEC DELAY | | | ONE-SEC DELAY | |
| (1 OF 10) | | | (1 OF 10) | |
+--------------------------------------+ | +-----------------+ |
| | | | | | | | | | | | | | |
/ / / / / / / / / / / / / / /
| | | | | | | | | | | | | | |
V V V V V V V V V | V V V V |
+--------------------------------------+ | +-----------------+ |
| ONE-SEC DELAY | | | ONE-SEC DELAY | |
| (10 OF 10) | | | (10 OF 10) | |
+--------------------------------------+ | +-----------------+ |
| | | | | | | | | | | | | | |
| | | | | | | | | | | | | | |
V V V V V V V V V V V V V V V
+----------------------------------------------------------------+
| UPDATE STATISTICS COUNTERS |
| |
|<------------- NEAR END ---------------->| |<---- FAR END ----->|
| |
|LCV LES PCV CCV PES CES PSES CSES SEFS UAS CCV CES CSES SEFS UAS|
+----------------------------------------------------------------+Heads up bestie 🙈 if you adopt this procedure, there is no current interval data for the first ten seconds after a system comes up. So if a management station tries to access the current interval counters during that window, noSuchInstance must be returned.
Whether the agent assumes the interface starts out available or unavailable is an implementation-specific matter 🌈
6. Intellectual Property 💜
The IETF doesn't take a position on whether any intellectual property or other rights that might be claimed to cover the technology in this document are valid or in scope, or on whether any license under those rights is available. It also doesn't say it has tried to find any such rights 🤷♀️ If you want the IETF's procedures for rights in standards-track and standards-related documents, check BCP-11. Copies of claimed rights that were made available for publication, plus any assurances of licenses, or the results of an attempt to get a general license or permission for implementers or users to use those proprietary rights, can be obtained from the IETF Secretariat.
The IETF invites any interested party to bring to its attention any copyrights, patents, patent applications, or other proprietary rights that may cover technology required to practice this standard. Send that info to the IETF Executive Director 📬
7. Acknowledgments 🎀
This document was produced by the Trunk MIB Working Group 🫶
8. References 📚
- [1] Harrington, D., Presuhn, R. and B. Wijnen, "An Architecture for Describing SNMP Management Frameworks", RFC 2271, January 1998.
- [2] Rose, M. and K. McCloghrie, "Structure and Identification of Management Information for TCP/IP-based Internets", STD 16, RFC 1155, May 1990.
- [3] Rose, M. and K. McCloghrie, "Concise MIB Definitions", STD 16, RFC 1212, March 1991.
- [4] Rose, M., "A Convention for Defining Traps for use with the SNMP", RFC 1215, March 1991.
- [5] Case, J., McCloghrie, K., Rose, M. and S. Waldbusser, "Structure of Management Information for Version 2 of the Simple Network Management Protocol (SNMPv2)", RFC 1902, January 1996.
- [6] Case, J., McCloghrie, K., Rose, M. and S. Waldbusser, "Textual Conventions for Version 2 of the Simple Network Management Protocol (SNMPv2)", RFC 1903, January 1996.
- [7] Case, J., McCloghrie, K., Rose, M. and S. Waldbusser, "Conformance Statements for Version 2 of the Simple Network Management Protocol (SNMPv2)", RFC 1904, January 1996.
- [8] Case, J., Fedor, M., Schoffstall, M. and J. Davin, "Simple Network Management Protocol", STD 15, RFC 1157, May 1990.
- [9] Case, J., McCloghrie, K., Rose, M. and S. Waldbusser, "Introduction to Community-based SNMPv2", RFC 1901, January 1996.
- [10] Case, J., McCloghrie, K., Rose, M. and S. Waldbusser, "Transport Mappings for Version 2 of the Simple Network Management Protocol (SNMPv2)", RFC 1906, January 1996.
- [11] Case, J., Harrington D., Presuhn R. and B. Wijnen, "Message Processing and Dispatching for the Simple Network Management Protocol (SNMP)", RFC 2272, January 1998.
- [12] Blumenthal, U. and B. Wijnen, "User-based Security Model (USM) for version 3 of the Simple Network Management Protocol (SNMPv3)", RFC 2274, January 1998.
- [13] Case, J., McCloghrie, K., Rose, M. and S. Waldbusser, "Protocol Operations for Version 2 of the Simple Network Management Protocol (SNMPv2)", RFC 1905, January 1996.
- [14] Levi, D., Meyer, P. and B. Stewart, "SNMPv3 Applications", RFC 2273, January 1998.
- [15] Wijnen, B., Presuhn, R. and K. McCloghrie, "View-based Access Control Model (VACM) for the Simple Network Management Protocol (SNMP)", RFC 2275, January 1998.
- [16] McCloghrie, K. and F. Kastenholz, "The Interfaces Group MIB using SMIv2", RFC 2233, November 1997.
- [17] Fowler D., "Definitions of Managed Objects for the DS1 and E1 Interface Types", RFC 2495, January 1999.
- [18] Brown, T., and Tesink, K., "Definitions of Managed Objects for the SONET/SDH Interface Type", Work in Progress.
- [19] American National Standard for telecommunications - digital hierarchy - electrical interfaces, ANSI T1.102- 1987.
- [20] American National Standard for telecommunications - digital hierarchy - formats specification, ANSI T1.107- 1988.
- [20a] ANSI T1.107a-1990.
- [21] American National Standard for telecommunications - Carrier-to-Customer Installation - DS3 Metallic Interface, ANSI T1.404- 1989.
- [22] American National Standard for Telecommunications -- Layer 1 In-Service Digital Transmission Performance Monitoring T1.231, Sept 1993.
- [23] CCITT - Digital Multiplex Equipment Operating at the Third Order Bit Rate of 34 368 Kbit/s and the Forth Order Bit Rate of 139 264 Kbit/s and Using Positive Justification, G.751
- [24] European Telecommunications Standards Institute -- ETS "34M" -- Metropolitan Area Network Physical Convergence Layer Procedure for 34.368 Megabits per Second, T/NA(91)18, May 1991.
- [25] Fowler, D., "Definitions of Managed Objects for the Ds0 and DS0Bundle Interface Types", RFC 2494, January 1999.
- [26] Tesink, K., "Textual Conventions for MIB Modules Using Performance History Based on 15 Minute Intervals", RFC 2493, January 1999.
9. Security Considerations 🔐
SNMPv1 by itself is such an insecure environment 😭 Even if the network itself is secure (for example by using IPSec), there is still no control over who on that secure network is allowed to access and GET (read) the objects in this MIB.
It is recommended that implementors consider the security features provided by the SNMPv3 framework. Specifically, use of the User-based Security Model RFC 2274 [12] and the View-based Access Control Model RFC 2275 [15] is recommended. 💖
After that, it's a customer/user responsibility to make sure the SNMP entity giving access to an instance of this MIB is properly configured, so those objects are only accessible to principals (users) who have legitimate rights to them 🔥
Setting any of the following objects to an inappropriate value can cause loss of traffic 💀 What counts as inappropriate depends on the object. For dsx3LineType, for example, both ends of a ds3/e3 must have the same value in order for traffic to flow. For dsx3SendCode and dsx3LoopbackConfig, traffic may stop transmitting when particular loopbacks are applied.
dsx3LineTypedsx3LineCodingdsx3SendCodedsx3LoopbackConfigdsx3TransmitClockSourcedsx3LineLengthdsx3Channelization
Setting dsx3CircuitIdentifier is mischievous 😈 but it's not harmful to traffic.
Setting dsx3LineStatusChangeTrabEnable can cause an increase in the number of traps received by the network management station 📈
10. Author's Address 🦋
David Fowler
Newbridge Networks
600 March Road
Kanata, Ontario, Canada K2K 2E6
Phone: (613) 599-3600, ext 6559
EMail: davef@newbridge.com11. Full Copyright Statement ✨
Copyright (C) The Internet Society (1999). All Rights Reserved. 🎀
okay so the legal bit, bestie 💅 you're allowed to copy this document and share it with others, and you can make derivative works that comment on or explain it or help people implement it. you can prepare, copy, publish and distribute those, in whole or in part, with no restriction of any kind, as long as the above copyright notice and this paragraph are included on all of those copies and derivative works. 🦋 BUT the document itself may not be modified in any way, like removing the copyright notice or the references to the Internet Society or other Internet organizations. the exceptions are when it's needed for developing Internet standards, in which case the procedures for copyrights defined in the Internet Standards process must be followed, or when it's being translated into languages other than English. 🌸
The limited permissions above are perpetual and will not be revoked by the Internet Society or its successors or assigns. 💜 forever, literally.
This document and the information in it is provided on an "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING TASK FORCE DISCLAIMS 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. 😭
📦 where this page comes from
- ietf: rfc2496 1999-01
- 💖 girlified by claude-haiku-5-5 on : a language model's rewrite of the original, under its terms