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
