we are using two rtrs RTR-A and RTR-B, both are cisco 7604. RTR-A is connected one ISP and RTR-B is connected to another ISB. Both rtrs are running BGP with their ISP peer. Some of the networks of RTR-A are configured as ip next hop to RTR-B.
The problem is when ISP LINK of RTR-A goes down the traffic of networks of RTR-A also went down for which next hop is configured RTR-B Can some one explain why?
One thing that needs to be checked is the route advertisements to the ISP?
If you have routes you need advertised for routing back in case one link goes down then you need to make sure the routes are being sent out in the first place. If one link goes down and that is the only link advertising that route then it will never be routed since the routes are removed from the BGP table and then the routing table.
Another possible answer is the IP blocks are too small to be routed beyond the ISP you are connected to.
What are you trying to accomplish?
Do you have your AS and IP space?
Are you receiving any BGP routes from the ISP?
With the route-map it sounds like you are using PBR's and static routes.
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