CVSROOT: /cvs
Module name: src
Changes by: [email protected] 2026/06/02 02:40:02
Modified files:
usr.sbin/bgpd : bgpd.conf.5 parse.y printconf.c
Log message:
Default 'announce as-4byte' to 'enforce' for all peers
After close to 20 years of 4-byte AS support in bgpd it is time to enforce
it. The fall back code from 2-byte AS to 4-byte AS is non-trivial and
the RFC is way to optimistic and ignores many possible error conditions.
All relevant BGP implementations support 4-byte ASnums so it is a
misconfiguration to not use this by default. Most implementations do this
by default.
In the unlikely cases where 2-byte AS support is still needed one can
fall back to the previous default by using 'announce as-4byte yes'.
OK tb@ job@
