From: Jay Greenberg (groupstudylist@execulink.com)
Date: Sat Nov 30 2002 - 16:36:43 GMT-3
You can establish a BGP session with mismatched peer IP addresses. The
requested destination router-ID does not appear to be sent with the BGP
OPEN. The following two routers will establish a connection:
ROUTER A
router bgp 2
neighbor 172.16.101.2 remote-as 1
neighbor 172.16.101.2 update-source lo0
in lo0
ip add 66.66.66.1 255.0.0.0
ROUTER B
router bgp 1
neighbor 172.16.101.1 remote 2
That said, update-source only seems to be effective when both peers
agree on what it should be.
Jay Greenberg
On Sat, 2002-11-30 at 09:37, Peter van Oene wrote:
> Unless Cisco has changed their default behavior wrt to how BGP packets
> are generated for IBGP peering, without this command, your IBGP peers
> should not become established due to source/destination mismatches.
> This assumes you are peering on loops however.
>
>
> On Sat, 2002-11-30 at 01:38, Nathan Chessin wrote:
> > Hi All,
> >
> > I am finding that it is not necessary to use the "update-source" for iBGP
> > peering. Can anyone verify this? I thought the update-source command said
> > what interface the updates were coming out of, but it doesn't seem to matter
> > as long as there is a route back to that interface.
> >
> > For that matter, it doesn't seem necessary for eBGP either. Is this an old
> > command that isn't necessary anymore?
> >
> > Thanks,
> >
> > Nate
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