[j-nsp] Load Balancing via BGP outbound at Colo

[Chuck Anderson]

On Thu, Mar 15, 2007 at 02:28:20PM +0200, Tim Nagy wrote:
> You'd like to send and receive all traffic on the links to ISP #1 except for
> traffic that terminates in ISPs #2, #3, #10, or #20. Is that correct?
> 
> For inbound, things are more complicated.  The only way that you can really
> influence your inbound traffic across multiple ISPs is through AS path
> prepending. You could advertise all of your routes to all ISPs, but prepend
> your AS multiple times to ISPs #2, #3, #10, and #20. That would reduce the
> traffic flow in from those ISPs and make your ISP #1 links the primary
> inbound points.

You could also attach the well-known community NO EXPORT to routes you 
send to ISP #2, #3, #10 and #20 so that those ISPs use your routes to 
get back to you directly, but they won't readvertise your routes to 
their upstreams and peers.