[c-nsp] Multihop BGP between PE to CE

[Masood Ahmad Shah]

Is Multihop BGP supported between PE to CE? If the answer yes, then how do
you guys use this with Cisco. 


Regards,
Masood Ahmad Shah

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Oliver Boehmer
(oboehmer)
Sent: Friday, September 28, 2007 4:55 PM
To: Tim Franklin
Cc: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] Redundant default route, without round-robin routing

Tim Franklin <mailto:tim at pelican.org> wrote on Friday, September 28,
2007 1:23 PM:

> On Fri, September 28, 2007 12:17 pm, Oliver Boehmer (oboehmer) wrote:
> 
>>> In that case, I'd be inclined to iBGP-mesh all the boxes, inject 
>>> just a default into BGP from the two border routers, and let all the 
>>> other routers pick their 'best' route of the two.  All other things 
>>> being equal, this should be the border router that can be reached 
>>> with the lowest IGP cost, or if they're all on a shared medium (I 
>>> think this was the case from your original post), first route 
>>> received.
>> 
>> Even if you reach both next-hops via the same outgoing interface, IOS 
>> will load-share between both of them. CEF will see two adjacencies, 
>> no matter if they share the same interface.
> 
> You're confusing me now, Oli - BGP is still *not* multipath by 
> default, right?  So one route makes it to the routing table, one
next-hop, one
> adjacency?

Oh, ok. I was assuming that multipath was enabled, so we'd have both routes
showing up the routing table. 
If it is not enabled, lowest router-id will win in this case (router-id
comparison will only be skipped if both paths were external).

	oli
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