On 1/16/2013 10:11 PM, Brandon Ross wrote: > On Wed, 16 Jan 2013, Keith wrote: > >> Peer #1 - all 4 networks are prepended with our AS 5 times: > > Okay so far... > >> This way I have two networks coming in on one gig link and the other two >> networks are coming in over the other gig link. > > No, you don't. You have all 4 networks coming in on all 4 links. > >> There should be no traffic incoming in on Peer #1 from the internet. >> But there is. > > Not quite. You have advertised a route to another AS. Each AS will use > it's own criteria to decide how to route traffic. For example, most > service providers will prefer to send traffic to their customers' direct > connections instead of sending that traffic to an intermediate AS. That > preference is usually implemented using localpref which is a decision > made by routers before AS path length, just like you are doing to choose > how to send traffic out of your network. > > The only way to ensure that NO traffic comes in on that link is to > advertise NO routes at all. > > You can, however, influence traffic in a stronger way by advertising > more specific routes (since more specific routes are always preferred) > on links that you want to carry traffic.
You may also be able to set BGP communities on your announcements to Peer1 to control their handling of your prefixes. http://bgp.he.net/AS13768#_irr -DMM _______________________________________________ juniper-nsp mailing list juniper-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/juniper-nsp