IPv6: IS-IS or OSPFv3

Sun Dec 28 14:23:11 UTC 2008

>> 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".

this is not very deep.

mark did point out how to avoid it, pointing out why mt was very useful 
as opposed to just another bell and whistle.  during a transition, in 
fact, topologies are not congruent due to inability to have a flag 
millisecond, a very very useful observation.

randy