# Lab: Dual-Stack IS-IS Routing

DevFeed: [Lab: Dual-Stack IS-IS Routing](<https://devfeed.tech/articles/lab-dual-stack-is-is-routing-11097.md>)

Original publisher: [Read original article](<https://blog.ipspace.net/2024/11/isis-dual-stack/>)

Published: 2024-11-29T06:47:00Z

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>), [networking](<https://devfeed.tech/topics/networking.md>), [Routing (disambiguation)](<https://devfeed.tech/topics/routing.md>), [Protocol (disambiguation)](<https://devfeed.tech/topics/protocol.md>), [Internet Engineering Task Force (IETF)](<https://devfeed.tech/topics/ietf.md>)

Tags: [ietf](<https://devfeed.tech/tags/ietf.md>), [ipv4](<https://devfeed.tech/tags/ipv4.md>), [ipv6](<https://devfeed.tech/tags/ipv6.md>), [is-is](<https://devfeed.tech/tags/is-is.md>), [netlab](<https://devfeed.tech/tags/netlab.md>), [ospf](<https://devfeed.tech/tags/ospf.md>), [protocol](<https://devfeed.tech/tags/protocol.md>), [routing](<https://devfeed.tech/tags/routing.md>)

## AI overview

This lab examines dual-stack IS-IS routing for IPv4 and IPv6. It explains that IS-IS supported multiple protocols early on and discusses two incompatible methods for enabling IPv6 through additional TLVs.

## Source excerpt

Contrary to the OSPF world, where we have to use two completely different routing protocols to route IPv4 and IPv6 (unless you believe in the IPv4 address family in OSPFv3), IS-IS provided multi-protocol support from the very early days of its embracement by IETF. Adding IPv6 support was only a matter of a few extra TLVs, but even there, IETF gave us two incompatible ways of making IPv6 work with IS-IS. Read more ...