[c-nsp] Source address on BGP peering set up

[Mark Tinka]

On Friday 14 January 2005 15:59, McCallum, Robert wrote:
> hmmmmm isnt that the bgp router-id?

Indeed, it is! You're right... I guess I'm having one of those days :-\.

Mark.

> I though bgp like any other protocol 
> would take the outgoing interface.
>
> Robert McCallum
>
> > -----Original Message-----
> > From: Mark Tinka [mailto:mtinka at africaonline.co.sz]
> > Sent: 14 January 2005 13:46
> > To: cisco-nsp at puck.nether.net; Piltrafilla
> > Subject: Re: [c-nsp] Source address on BGP peering set up
> >
> > On Friday 14 January 2005 15:14, Piltrafilla wrote:
> > > Hi people,
> >
> > Hello.
> >
> > > Anyone knows how BGP on a Cisco router choose source IP address for
> > > peering establishment if no "update-source" command is applied to
> > > neighbor? Is it only the primary IP address on the closest
> >
> > interface
> >
> > > to neighbor?
> >
> > Without manually specifying your source interface, BGP will
> > find and use the
> > Loopback interface with the highest IP address. Failing that,
> > it will take
> > the next highest IP address configured on the router (regardless of
> > interface).
> >
> > This can become a problem, especially if you keep
> > adding/removing IP addresses
> > on your router (customers, new routers, new segments,
> > e.t.c.), hence the
> > elegance of 'update-source'.
> >
> > Mark.
> >
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