On Wednesday, November 10, 2010 04:08:42 pm Ivan Pepelnjak wrote:
MT IS-IS & MPLS =============== There's another gotcha that we totally missed: MT for IS-IS (RFC 5120) should be mentioned and it should be MANDATORY in combination with MPLS (otherwise you might experience some weird symptoms if you decide to run some IPv6 natively).
Apologies for the late reply: I think it would be a good idea to recommend MT regardless of whether MPLS is in use or not. Some systems, by default, will enable IS-IS for both v4 and v6 when turned on, e.g., JUNOS. Others won't and require either v4 or v6 support to be enabled explicitly, e.g., IOS. I think recommending MT be supported in all implementations of IS-IS is useful, so that native/dual-stack deployments of v6 don't cause network outages due to lack of topology congruency during turn-up. Cheers, Mark.