Hello all, Long time lurker, first time poster. I have a router that is multi-homed between 16631 and 701. I have a new client who is buying transit from us. They are multi-homed to us and 1239. A business decision was made to policy route their traffic out 16631. As a result I will only publish 16631 routes to them. However, if 16631 goes away, I want to be able to push the 701 routes to them. Injecting a default wouldn't be very effective here since 1239 will most likely have a more specific route! So Conditional Adv to the rescue. However..I have a few questions I am unsure about and I don't have a lab to try it out on. In this config: router bgp XXXX nei New_Client remote-as Client_AS nei New_Client filter-list 4 in nei New_Client filter-list 3 out ip as path access-list 3 permit .* ip as-path access-list 4 permit ^Client_AS$ so far so good.... I want to add this... nei New_Client advertise-map MAP1 non-exist-map MAP2 route-map MAP1 permit 10 match as-path 5 route-map MAP2 permit 10 match as-path 6 ip as-path access-list 5 ^$ _16631_ ip as-path access-list 6 ^$ _701_ SO NOW THE QUESTIONS!!! 1) What is the order of operation for the advertisement out? Will the Filter-list showing all routes cancel any effect of the route-map? 2) Are the MAP1 and MAP2 route maps valid in this config because they use as-path? The config's I could find as example were based on Prefix. I made up the part about using the as-path, but it seems logical (boy, I wish I had a couple extra routers!) 3) Is there a better way to go about this! Thanks in advance. And thanks to everybody who posts. I have taken away a lot from this mailing-list! Jim
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