Inbound traffic: advertise /28 to upstream2. It will not get very far, though, so it's questionable whether it will leak over to upstream1 and influence the return traffic coming from upstream1.
Outbound traffic: policy routing seems to be the quickest (and the dirtiest ;) solution. Getting it to work if the exit points are too far apart is a nightmare. If you're OK with the /28 being very tightly bound to the specific uplink (i.e. no connectivity when the uplink is down), there are a few MPLS VPN tricks you could use. Ivan > -----Original Message----- > From: Dracul [mailto:[email protected]] > Sent: Tuesday, January 05, 2010 5:17 PM > To: [email protected] > Subject: Re: [c-nsp] BGP ip addresses re-route to specific link > > > you can use "BGP Conditional Route Injection" to generate the /28. (it > shud be a child subnet out of the parent /24). then filter the prefixes so > select which all upstreams shud receive this injected > > subnet. > > thanks swap will explore your suggestion. > > > >Be aware that many (most) ISPs would filter subnets longer than /24, so > >your /28 would be most likely filtered (even if you direct upstream > >would send it through). > >Arie > > Thanks arie, will keep it in mind. > > On Tue, Jan 5, 2010 at 5:00 PM, Ivan Pepelnjak <[email protected]> wrote: > > > Are you trying to do destination-based routing (packet TO specific > address > > should go over specific link) or source-based routing (packet FROM > specific > > /28 should go over specific upstream link)? > > > > > Hi Ivan, I guess both. i just want to have a specific ip block traffic > contained to a specific link ( the ip addresses are broadcast under BGP) > > regards, > Chris > > > -----Original Message----- > > > From: Dracul [mailto:[email protected]] > > > Sent: Tuesday, January 05, 2010 8:05 AM > > > To: [email protected] > > > Subject: [c-nsp] BGP ip addresses re-route to specific link > > > > > > Hi there, > > > > > > I was wondering if you could do a segregate route, for specfic ip > > > addresses > > > under BGP going only to a specific link. > > > for example if I have /24 default route BGP pool and I want only /28 > ip > > > addresses using upstream1 and not by any > > > account go through upstream2. The rest would still be using the usual > BGP > > > routing behavior. THanks! > > > > > > regards, > > > Chris > > > > > > _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
