On 7/23/11 9:37 AM, Ivan Pepelnjak wrote:
IS-IS MT is highly desirable in most circumstances anyway, but we haven't considered that a good-enough reason to make it MANDATORY.
However, if you run MPLS TE without MT, you get black hole routing the moment the first autoroute MPLS TE tunnel is established; thus we've made IS-IS MT MANDATORY for networks running MPLS TE.
Details here: http://blog.ioshints.info/2010/03/is-ismpls-tenative-ipv6fail.html
However, I'm perfectly happy if the WG decides to make IS-IS MT mandatory in all cases (would make sense anyway).
Currently, this is mandatory only "If MPLS Traffic Engineering is used in combination with IS-IS routing protocol" What percentage of equipment we exclude as routers if we make this unconditionally mandatory? I know for at least Mikrotik routers are excluded, as they do not support IS-IS at all (and they are quite used in small/medium companies environment). Opinions? Cheers, Jan