Once upon a time, William Herrin <bill@herrin.us> said:
On Tue, Jan 23, 2024 at 4:00 PM Chris Adams <cma@cmadams.net> wrote:
Once upon a time, William Herrin <bill@herrin.us> said:
Nevertheless, in the protocol's design, the one expressed in the RFC's, AS path length = distance.
The RFC doesn't make any equivalence between AS path length and distance. You are the one trying to make that equivalence,
Respectfully Chris, you are mistaken.
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.
That's literally not the first thing - you skipped section 9.1.1. It also literally says nothing about distance. -- Chris Adams <cma@cmadams.net>