[j-nsp] cogent bgp example?

[bill fumerola]

On Wed, Aug 20, 2008 at 11:39:56PM +0300, Amos Rosenboim wrote:
> Can you explain the logic behind Cogent BGP topology?
> Are they going through all these configuration efforts just so their  
> PE routers will not have to carry full internet feed?

i can't/won't speak directly to the cogent topology, but you can use any
number of devices that can carry minimal routes (just the /32s and/or
customer routes) in BGP on the provider edge and use any number of devices
(hardware routers, software like quagga or xorp) to provide the full
routes. additionally, you can distribute capacity of dealing with large
amounts of routes across a different set of equipment than your link
capacity. two different devices for two different jobs.

it actually makes a lot of sense, especially if you run your entire edge
network on cheap 'multi-layer switches' like sup2 6500s or similar.


-- bill