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Re: [NANOG] peering between ASes

daemon@ATHENA.MIT.EDU (Nathan Ward)
Fri May 16 23:07:36 2008

From: Nathan Ward <nanog@daork.net>
To: nanog <nanog@merit.edu>
In-Reply-To: <e81393830805160852w15ee537bx795b516c859302b2@mail.gmail.com>
Date: Sat, 17 May 2008 15:07:20 +1200
Errors-To: nanog-bounces@nanog.org

On 17/05/2008, at 3:52 AM, Kai Chen wrote:
> Sure, two ASs may peer with each other at multiple locations, I do  
> want to
> know in each of these peering location, if there exist multi-access  
> between
> these two ASes.


If you're looking for some rules about how this must work, you won't  
find them - all these things are optional and dynamic.

Multiple accesses between two ASes at a single physical location is  
possible, yes. It's probably a good idea in most cases - whether it  
happens or not is usually a matter of whether the cost (both capital  
and opex) is worth it, I imagine.

RE. your original question (2) - yes a single router in each AS and a  
link between them is the simplest. Add more routers and more links as  
required to meet capacity and resiliency requirements, where cost  
permits.

--
Nathan Ward


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