Seeing a lot of ROUTING-FIB-3-UPD_MSG_TOO_BIG messages today

Mon Apr 25 16:35:19 UTC 2022

Hey Drew,

> I’ve seen this a bit in the past with 1-2 routes, but today it’s been happening basically all morning with several different routes.
> ROUTING-FIB-3-UPD_MSG_TOO_BIG
> I’ve chased it down from a vendor level and they implied that it is just informational, my question is why do these sort of updates seem to be sent to the Internet’s routing table in bursts?

This is really cisco-nsp issue, not nanog, nanog is about unfalsiable
politics and explaining how simple things are which you've never done
at any scale or availability needs.

You probably have 'bgp attribute-download' configured, which means
things like communities, as-paths etc are given for FIB consumption,
usually because you want netflow to export AS data, instead of
enriching it at the receiver.
So likely you have some RIB entry with a very long path or many
communities, and this made the IPC message too large, and those
attributes were not sent to the FIB. The prefix and forwarding
information is there, juste the attribute download failed.

-- 
  ++ytti