I have 7280SR running an earlier version that works with the same cisco with the same configs.
Has anyone had such problems with isis in 4.20.5F?
Can you configure the IP MTU to be the same on both Arista and Cisco and see if that helps? If the neighborship does not come up, we recommend you to open a TAC case at firstname.lastname@example.org.
As investigated via TAC case, the issue turned out to be capabilities advertised by both the switches:
We were advertising only v4:
Turning on v6 capability in IS-IS solved the issue.
Can you share the change to 'Turning on v6 capability in IS-IS solved the issue"?
Rohan, thanks once again
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