From: Brent D. Stewart (brent@xxxxxxxxxxxxxxxxxxxxx)
Date: Fri Aug 24 2001 - 14:18:42 GMT-3
I've got two routers that are directly attached with an HDLC circuit in my
lab. Each run BGP, one uses the serial address of the other in it's
neighbor statement; the other peers to a loopback interface.
R1--------------------------R2
s0 192.168.0.1/24 lo0 10.0.0.1/32
The R1 configuration looks like
router bgp 1
nei 10.0.0.1 remote-as 2
nei 10.0.0.2 ebgp-m 2
The R2 configuration looks like
router bgp 2
nei 192.168.0.1 remote-as 1
RIP is running between them as well, so R1 knows how to get to R2's
loopback.
Why does this work? I thought I needed to add to R2's configuration "nei
192.168.0.1 update-s lo0". I thought that R1's BGP process would check the
source address before peering (btw - adding the statement doesn't break it).
Obviously I thought wrong, because it works. R1 is running 12.0(10) and R2
is running 12.0(3c), but I've duplicated this with a couple of intervening
versions. Is this a v12 protect-them-from-themselves thing, or did I just
never understand this correctly?
Thanks everyone.
Regards,
Brent D. Stewart, CCSI
Global Knowledge
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