[c-nsp] BGP multihop between two sites

[John.Herbert at ins.com]

Randy,

By no means an answer to all your questions, but there may be some useful info in this thread regarding routing over the internet between the same ASN:

http://www.gossamer-threads.com/lists/nanog/users/115689?#115689

I'm not quite clear on the floating default? What is it floating "over"? If you are receiving a default in BGP, then are you / can you receive it from multiple providers for resiliency? And if so, under what circumstances is the floating static ever active in your routing tables?

John.

________________________________
From: cisco-nsp-bounces at puck.nether.net [cisco-nsp-bounces at puck.nether.net] On Behalf Of Randy McAnally [rsm at fast-serv.com]
Sent: Wednesday, September 02, 2009 16:51
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] BGP multihop between two sites

We have two sites advertising unique subnets via the same AS.  Since the
subnets originate from the same AS they apparently get dropped from the tables
at each site.

Each site has at least 3 upstreams taking full tables from each with a 6509.

Site a has a single border router with dual supervisors.

Site b actually has dual border routers.  Each router handles different
upstreams and trades routes via iBGP.

So I think I need to set up a multihop session between the sites.

Right now, traffic between sites is taking the floating default route and
causes issues between sites when one of our BGP peers is down for whatever reason.

What are the things to look out for when setting up this multihop?  Are there
gotcha's to deal with given one site has dual active routers?

Can anyone provide me or point me to an example multihop config to work from?

--
Randy

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