From: Scott Morris (swm@emanon.com)
Date: Fri Aug 19 2005 - 21:51:25 GMT-3
And here I thought the reason you peered to the interface with eBGP was
because the RFC said you had to. ;)
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Brian Dennis
Sent: Friday, August 19, 2005 8:45 PM
To: Ed Tan; ccielab@groupstudy.com
Subject: RE: BGP neighbor
First off normally it's not the router-id you peer with but a loopback
interface's IP address.
Have you thought of why it's common to peer between loopbacks for iBGP?
If you answer this you should be able to answer the reason why it's common
to peer with an interface for eBGP.
Basically the idea is that you have multiple routes between iBGP peers and
you want the iBGP peering session to remain up when one of the routes is
unavailable. With eBGP you normally do not want the peering session to stay
up when your interface to the neighbor is down. The exception is of course
when you have multiple connections to that neighbor (i.e. two T1's). As
always there are always exceptions to this but these are the common reasons.
HTH,
Brian Dennis, CCIE #2210 (R&S/ISP-Dial/Security)
bdennis@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
Toll Free: 877-224-8987
Direct: 775-745-6404 (Outside the US and Canada)
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Ed
Tan
Sent: Friday, August 19, 2005 4:50 PM
To: ccielab@groupstudy.com
Subject: BGP neighbor
Hi group,
I know it is a good practice to point the IBGP neighbor to the neighbor's
router-id (instead of the interface address). I want to know why we always
use the interface address as EBGP neighbor rather than the router-id?
Thanks,
Ed
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