BGP, ebgp-multihop and multiple peers

Rick Ernst ernst at easystreet.com
Wed Aug 27 11:00:21 CDT 2008


If you keep a separate peering/loopback-IP for each peer, you can move
individual peering sessions to other devices if needed.


On Wed, August 27, 2008 05:39, Steve Bertrand wrote:
> Iljitsch van Beijnum wrote:
>
>> The advantage of a separate loopback address is that if you ever have
>> any trouble, you can simply remove that address and the trouble is gone,
>> too. This wouldn't work for the loopback address you also use for iBGP
>> or a physical interface.
>
> Ok. It probably would have made much more sense in my original post to
> clarify that each eBGP multihop peer session is configured on separate
> loopback interfaces, apart from the ones I use internally.
>
> Generally, I leave lo0 as-is, lo1 for internal, then configure each eBGP
> multihop peer on an incremental loopback basis thereafter.
>
> So, in essence, I'll continue to use a loopback (separate from internal
> functions) for ebgp-multihop peers, but instead of each session having
> its own interface/IP, I'll share one for all of them.
>
> Thanks everyone!
>
> Steve
>





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