On Thu, Dec 23, 2010 at 10:41 AM, Leonardo Gama Souza < leonardo.so...@nec.com.br> wrote:
> Hi, > > There is an approach of matching on LSB from the prefixes' octets of the > full routing table (even/odd) and increase local-preference for one > provider. > > For example: > > access-list 1 permit 0.0.0.0 255.254.254.255 > access-list 2 permit 0.0.1.0 255.254.254.255 > access-list 3 permit 0.1.0.0 255.254.254.255 > access-list 4 permit 0.1.1.0 255.254.254.255 > > route-map ISP1 permit 10 > match ip address 1 2 > set local-preference 120 > route-map ISP1 permit 20 > match ip address 3 4 > set local-preference 110 > route-map ISP1 permit 1000 > > route-map ISP2 permit 10 > match ip address 1 2 > set local-preference 110 > route-map ISP2 permit 20 > match ip address 3 4 > set local-preference 120 > route-map ISP2 permit 1000 > > I don't think this would work very well on the actual internet. For example I can think of several large ISP's where most of their aggregated IP space would fall on the same link or wouldn't be touched at all. For example AT&T (12/9) and Level3 (4/8) among others. _______________________________________________ cisco-nsp mailing list cisco-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/