lldptool(8)

💖 lldptool(8) — APP 💖

okay bestie, welcome to the lldptool girlies' guide to the APP TLV ✨ this one lives in the Linux manual pages and it's literally all about showing off and manipulating your APP TLV configuration 🎀

🌸 NAME 🌸

APP — show / manipulate APP TLV configuration 🦋

✨ SYNOPSIS ✨

lldptool -t -i ethx -V APP [-c app]

lldptool -T -i ethx -V APP [-d] app=prio,sel,pid

like. that's the whole vibe. two modes, that's it 💅

💅 DESCRIPTION 💅

okay so the APP TLV is an informational TLV — it's giving "just here to share the news", no cap. It advertises the current configured application table 📢

and here's the tea: if the peer APP TLV and a local APP TLV both match on the same selector and protocol field, then the local parameter is used. local wins, periodt. 👑

🎀 ARGUMENTS 🎀

• app — sets up a local application data field using three lil parameters: priority (prio), selector (sel), and protocol (pid). and if you pass the -d option too? it removes the entry that matches all three of those parameters 🗑️✨

🧚 Theory of Operations 🧚

so for most end stations, the APP TLV is an informational TLV. it is not expected that setting APP data should be required — like, chill, you probably don't need to touch it 🫶

by default, peer data gets processed and added to the application data table automatically, assuming there isn't already a local entry with matching selector and priority fields. (key word: assuming 👀)

and why do we even care? because once APP data is in the application table, it's available for applications — eg iscsid — to query 🔍 those applications query for a specific protocol and selector, and they can use that data to map traffic to the corresponding traffic class. it's giving matchmaker energy honestly 💘

🌈 EXAMPLE & USAGE 🌈

Configure ISCSI application for priority 4 on eth2

lldptool -T -i eth2 -V APP app=4,2,3260

Configure FCoE application for priority 3 on eth2

lldptool -T -i eth2 -V APP app=3,1,35078

Remove FCoE application for priority 3 on eth2

lldptool -T -i eth2 -V APP -d app=3,1,35078

Display locally configured application table on eth2

lldptool -t -i eth2 -V APP -c app

Display last transmitted APP TLV on eth2

lldptool -t -i eth2 -V APP

see? iconic. ate and left no crumbs 🍓

⭐ SOURCE ⭐

• IEEE 802.1Qaz (http://www.ieee802.org/1/pages/dcbridges.html)

👑 SEE ALSO 👑

lldptool(8), lldpad(8)

💜 AUTHOR 💜

John Fastabend

fr fr, that's the whole page. go configure some application tables, bestie, you've got this 💪🦋

open-lldp · February 2010 — yeah she's vintage, but she's still serving 💅 mwah 😘