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

[McCallum, Robert]

hmmmmm isnt that the bgp router-id?  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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