# Lab: IS-IS Designated Router Election

DevFeed: [Lab: IS-IS Designated Router Election](<https://devfeed.tech/articles/lab-is-is-designated-router-election-11151.md>)

Original publisher: [Read original article](<https://blog.ipspace.net/2025/03/isis-dis-election/>)

Published: 2025-03-13T07:03:00Z

Content type: tutorial

Language: en

Sources: [ipSpace.net blog](<https://devfeed.tech/sources/ipspace-net-blog.md>)

Topics: [IS-IS](<https://devfeed.tech/topics/is-is.md>)

Tags: [is-is](<https://devfeed.tech/tags/is-is.md>), [lan](<https://devfeed.tech/tags/lan.md>), [netlab](<https://devfeed.tech/tags/netlab.md>), [ospf](<https://devfeed.tech/tags/ospf.md>), [router](<https://devfeed.tech/tags/router.md>), [standards](<https://devfeed.tech/tags/standards.md>)

## AI overview

This lab article explains that IS-IS uses a Designated Intermediate System (DIS) router to originate the pseudo-node for a LAN segment. Unlike OSPF, the DIS does not need a backup because it is not responsible for flooding.

## Source excerpt

Like OSPF, IS-IS needs a router to originate the pseudo-node for a LAN segment. IS-IS standards call that router a Designated Intermediate System (DIS), and since it is not responsible for flooding, it does not need a backup. Want to know more? The Influence the Designated IS Election lab exercise provides the details (and some hands-on work).