Thursday, January 28, 2021

BGP route "aggregator" on public internet is.... RFC1918?

Hey All - see image - https://imgur.com/a/k2seNgJ

This is one of my public IPv4 routes on Telia looking glass. It's showing my router's private loopback IP as route aggregator... I think this is set in the atomic aggregator attribute on BGP route advertisement. But surely private IP shouldn't ever be seen in someone elses router? For confirmation, the BGP session is established with public v4 address provided by transit provider. Everything working fine.

This doesn't seem right though - is anything wrong here? This is configured on a Juniper router. Perhaps this is expected 🤷‍♂️



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