BGP Routing Protocol

[Mohammad E. Al-Rawi]

Hello!

I have a question about BGP, is there a way to receive same prefixes from one router by different BGP peers as different best paths that connected to my router by sub interfaces? is there any technique regarding this case?

Thanks.

[Giuseppe Larosa]

Hello Mohammad,

the eBGP paths must have a tie (same value)  on the first BGP attributes:

same weight

same local-preference

same AS path length

same origin code (i or ?)

same MED  (if using bgp always-compare-med)

then under router bgp you issue

maximum-paths 4

Note: a single best path is still chosen by BGP but if there is a tie on first BGP best path selection criteria multiple BGP routes can be installed in the IP routing table

Hope to help

Giuseppe