Hey, just checking as I don’t have any Cisco or Extreme or Juniper gear running IS-IS to verify myself…
On current Arista (7280SR2K) and older Brocade (MLXe) routers, the IPv6 next-hop address in IS-IS seems to always be the link-local address of the neighbour, instead of any manually-assigned address on the interface. I believe this is *not*
the case with Cisco, in particular. Not sure about other vendors, I don’t have any handy that can run IS-IS. I don’t appear to have any knobs to control this behaviour, and haven’t found anything related in the docs.
Can anyone confirm that Cisco or other vendors does/do not do this (prefer LLA over GUA)?
Thanks,
-Adam
Adam Thompson
Consultant, Infrastructure Services
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