I'd suspect MTU issues here.
Cheers,
Mark.
It's looking like it somehow might be related to that. For a test, we
set the mtu on the toro-router2's interfaces back to 1500 from 9216.
After that was done, the sessions to the vanc routers both came up!
Strange because we didn't change any of the mtus on the vanc
routers.....they're all still 9216.
I can't comment on the platform; but I do know that BGP path-mtu
discovery is a new-ish feature in IOS e.g. it was added on 6500/7600 in
12.2(33)S images.
You mentioned you upgraded - maybe that's it?
There is a "neighbor" statement to disable the path mtu:
no neighbour X transport path-mtu-discovery
...of course, fixing the path MTU is better!
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