[c-nsp] BGP multihop between two sites

[Scott Granados]

You can set your neighbor statements to allow learning from the same AS so 
the routes won't be dropped.

Another good way to do this is to set up a GRE tunnel between the sites and 
connect your devices using the attached /30 addresses.

----- Original Message ----- 
From: "Randy McAnally" <rsm at fast-serv.com>
To: <cisco-nsp at puck.nether.net>
Sent: Wednesday, September 02, 2009 1:51 PM
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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