[c-nsp] Call for ideas/best practice - routing a site via a dual-homed location

[Garry]

Hi,

I'm looking for ideas on how to solve this (rather unusual I assume) 
problem ...
A customer site that has been only single-homed in our backbone is 
receiving a second uplink shortly. So far, no problem, they will be 
running dedicated routers with BGP, one doing dual uplinks to our core 
routers, the other to the second uplink. Problem is that a smaller POP 
(with multiple customers) is connected to another router at that site, 
which will be using the two other routers as default gateway to the 
outside, utilizing the full tables present there for routing ... Now, I 
don't want the POP's data to go out via the second uplink ...

One solution of course would be setting up a route map that redirects 
the next hop inside our backbone. But, running OSPF, this wouldn't 
really be a "clean" solution, and also require some overhead when 
changes at the POP occur. As is something like a GRE tunnel, which I'd 
really like to avoid.

Now, we run an MPLS-enabled backbone, and having just replaced the 
ancient 3640 at the POP with a brand new 1841, and with the customer 
site also in our MPLS network, I was thinking doing some virtual 
connection between the POP and our next backbone location ...

Question now is, what's the best (or best practice) solution you'd 
suggest for this constellation?

Tnx, -garry