>> 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