I'm enabling isis multi-topology in my network to support ipv6 (ipv4 already in place), but when I enable ipv6 router isis on an interface the adjacency flaps.
In detail, as soon as I configure "ipv6 router isis" on a vlan interface on the other side I get:
%CLNS-5-ADJCHANGE: ISIS: Adjacency to XXXX (VlanXX) Down, adjacency type changed
%CLNS-5-ADJCHANGE: ISIS: Adjacency to XXXX (VlanXX) Up, new adjacency
and the adjaceny type change from ISIS to M-ISIS (as expected).
Tested on 6509 WS-SUP720-3B with 12.2(33)SXH8b and 7606 WS-SUP720-3BXL with 12.2(18)SXF10. ISIS IPv4 is already configured and working as expected.
The global ISIS ipv6 configuration is the following:
My understanding is that with multi-topology I should not see any flaps.
Am I missing something?