[c-nsp] BGP conditional advertisemet - NON-EXIST route map's access-list problem

[Craig Pierantozzi]

On Mar 15, 2009, at 12:46 PM, Yan Filyurin wrote:

> If you want ISP 2 to be used as a backup for ISP1 inboud traffic  
> could you just advertise your routes to ISP2 with, say bigger AS  
> path to the point where even ISP2 thinks it is best to go somewhere  
> else than directly to you?

Providers will often set localpref lower on peers so customer routes  
will win even with a longer AS Path.

But several have customer traffic engineering communities to utilize  
in order to set localpref to go lower than peers which will result in  
pushing traffic to ISP1 which is the goal. Best to make an inquiry to  
the upstream provider to find out if they have BGP communities that  
can help.