I can move this discussion beyond the theory that Andrew phrases since I did this for a customer last week. Policy Based Routing (with route maps) will do exactly what you want. It works well. And it is possible to simplify the configuration slightly from what Andrew suggests.
I would start by looking at whatever routing logic you are using. Is it based on static default routes (ip route 0.0.0.0 0.0.0.0) or on some dynamic routing protocol? For which ever approach you have taken configure it so that the route through ISP 2 is the preferred route and the route through ISP 1 is a backup (you want a primary and backup route not 2 equal default routes with load sharing). Then you configure PBR to identify the traffic that should go to ISP 1 (Email or whatever) and set its next hop to ISP 1. So the config would keep access-list 101 and route-map instance 10 but would not need access-list 102 or route-map instance 20.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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