Bill,
> https://datatracker.ietf.org/doc/html/rfc4271#section-9.1.2.2 > > "a) Remove from consideration all routes that are not tied for having > the smallest number of AS numbers present in their AS_PATH > attributes." > > So literally, the first thing BGP does when picking the best next hop > is to discard all but the routes with the shortest AS path. Not really. I have never seen a BGP implementation which would do that. That section 9 you are referring to is just informational - no specific order in there is mandated. Shortest AS-PATH is used as step 4 or 5 in best path selection - not to mention Cost Communities which below links do not even consider: https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/13753-25.html https://www.juniper.net/documentation/us/en/software/junos/vpn-l2/bgp/topics/concept/routing-protocols-address-representation.html Thx, R.
