[isp-bgp] Re: EBGP and loopbacks

[Pete Templin <petelists@...>]

Tulip Rasputin wrote:
> Folks,
>
> Does anyone here run EBGP on loopbacks?  I have this customer who wants to run EBGP using
> loopbacks. Dont we always use loopbacks with only the IBGP peering?
EBGP is most frequently configured between interface addresses, but 
there are several reasons to configure between loopbacks:

1) With parallel independent (i.e. not MLPPP or similar) links between 
common routers, each side can twiddle the load balancing independent of BGP.
2) With parallel independent links between common routers, it keeps the 
BGP RIB smaller since only one route gets added, instead of one per link.
3) Avoids bugs with EBGP multipath (not saying there are, but just a 
potential reason).
4) Provides security through obscurity for the recent TCP/BGP 
vulnerability, since it's tougher for a miscreant to guess the 
address(es) to attack.

pt






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