hi all, my AS is a multihomed non-transit ( connected to 2 differents AS).
with 1 AS (PRIMARY) i used IP address of physical interface to peer EBGP session, with other AS (BACKUP), i used loopback address to peering EBGP session.
when i bring BACKUP EGBP session up, this disturb the primary link and i have many trafic loss on the primary link, until i shutdown backup bgp session.
i d'ont know why, ?
ALL traffic (incoming and outgoing) pass through PRIMARY AS, BACKUP AS are use only when PRIMARY fail. also my AS is not transit, i have filter BGP update between these 2 AS and only localy generate route are advertise to these peer using
neighbor <neighbor ip> route-map Permit_local_route out
ip as-path access-list 13 permit ^$
route-map Permit_local_route permit 10
match as-path 13
. with primary AS bandwidth is 32M, with secondary AS bandwidth is 7M.
problem is that when a bring up bgp session with secondary AS, PRIMARY link slow down at max 9M. this appen until i shutdown bgp session with seondary AS.
i make bgp session with secondary AS using loopback, and this loopback is reacheble using static route through this AS.