12.3. IS-IS Extensions for IPv6
RFC 2740, specifying OSPFv3, is 80 pages long. And the bulk of this chapter is devoted to just a high-level description of the protocol. In contrast, the Internet Draft describing the extension to IS-IS for support of IPv6 is a mere seven pages long,[12] reflecting the relative simplicity of the extension. Although the Internet Draft has yet to become an RFC, the extension is supported by all major router vendors and in most cases was implemented before OSPFv3.
[12] Christian E. Hopps, “Routing IPv6 with IS-IS,” draft-ietf-isis-ipv6-05.txt, January 2003.
The extension involves adding two new TLVs to the existing protocol: the IPv6 Reachability TLV and the IPv6 Interface Address TLV. These are merely IPv6 counterparts ...
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