We have 2 IPLC links to UK, one is a 512 link and thre other is a 2 Mbps link, we want to use the 512 link only for FTP and all other traffic should flow by the the 2 Mbps link, I know this can be acomplished by POLICY BASED ROUTING, my question is in case the 2 Mbps link fails, how will the traffic divert on the 512 link, as the 512 link has a ACL to allow only FTP traffic.
the route map will not affect how traffic is routed other than that defined in the route map ACL. If your other traffic normally goes over the 2 meg but uses the 512k in a failure, this will continue to be the case.
All the ACL is doing is it defines the traffic to be policy routed, anything that does not match is not dropped, but passed to be routed in the "normal" way.
Both normal traffic and FTP traffic can go over the 512 link
The need was to reach an host inside a LAN through a VPN connection managed by the LAN gateway (Cisco 1921).
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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