From: Simon Baxter (Simon.Baxter@xxxxxxxxxxxxxx)
Date: Mon Jul 24 2000 - 02:59:54 GMT-3
Can someone please verify the following...
Scenario :
2 IBGP peers, each with a connection to the same external AS. One of the
IBGP peers has a 'bgp default local-preference' value set to 200.
When the peers are reset, the one with no def loc-pref set will initially
advertise the route to the other IBGP peer but when it receives an update
for the same external network with the local-pref set, it sends an
'unreachable' update. The other peer receives a 'withdrawn' update.
*Mar 1 00:11:17: BGP: 10.1.1.2 send UPDATE 175.10.0.0/16 -- unreachable
and
00:21:09: BGP: 10.1.1.1 rcv UPDATE about 175.10.0.0/16 -- withdrawn
The end result is the peer with the highest local pref only has a route to
the destination via the ebgp peer. The other peer, with the lowest local
pref, has both the route via the ebgp peer (unselected) and the route via
the peer with the higher local pref.
I understand the need for local-pref, but didn't expect the 'loser' to
actually 'withdraw' the route!!
am I on the right track??
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