IS-IS is a true multi-protocol routing protocol as it supports IPv6, all it simply does is use different TLVs for IPv6 addresses, just like IPv4 prefixes are transported, IPv6 prefixes are exchanged the exact same way.

What’s more is IS-IS doesn’t use separate instances or address families to transport IPv4 and IPv6 addresses, it can transport those prefixes using a single instance of IS-IS.  Adjacencies, LSPs, Level 1 and Level 2 routing are all identical to IPv4 prefix sharing.


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