We have two isp plugged into the same router. Lets say A and B. In the current setup we have X.X.X.124/24 to X.X.X.128/24 published to both the ISPs but with AS prepended to ISP B using route-map. For some reason we see some of the Tier-1 ISPs are preferring ISP B over A to send us the traffic. Now we are looking to do aggregate for ISP B and also AS prepend for one network. Could someone tell me if the following is ok with route-map
route-map colt deny 10
match ip address prefix-list network-aggregate
route-map colt permit 20
route-map ril deny 10
match ip address prefix-list network-allbut1
route-map ril permit 20
match ip address prefix-list network-prepend
set as-path prepend our_AS our_AS our_AS
ip prefix-list network-aggregate s 5 permit X.X.X.124/22
ip prefix-list network-allbut1 s 5 permit X.X.X.124/24
ip prefix-list network-allbut1 s 10 permit X.X.X.125/24
ip prefix-list network-allbut1 s 15 permit X.X.X.126/24
ip prefix-list network-allbut1 s 20 permit X.X.X.127/24
ip prefix-list network-prepend s 5 permit X.X.X.128/24
I think you need a second clause invoking the prefix-list matching the aggregate.
Also I don't think you need the third empty statement unless there are other routes to be passed to ISPB.
if you have already denied all component routes.
Unless you want to use the empty 30 block to just implicitly match the aggregate route.
I would prefer to match a prefix-list explicitly to have better control leaving an empty block would automatically allow any new prefix you advertise in BGP and also provides a risk for you to pass routes from ISPA to ISPB.
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This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
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