IPv6: IS-IS or OSPFv3

Sun Dec 28 14:10:44 UTC 2008

>> as one who has been burned when topologies are not congruent, i gotta
>> ask.  if i do not anticipate v4 and v6 having different topologies,
>> and all my devices are dual-capable, would you still recommend mt for
>> other than future-proofing?
>
>In practice, we realized that enabling IS-ISv6 on interfaces already
running
>IS-ISv4 was problematic without MT pre- configured.
>
>Those links surely lost IS-IS adjacency which threatened stability of the
>network.

Yup, that is the rub: if rolling out your v6 routing impacts your v4 routing
you are not "winning".

/TJ