I don't claim to be an expert with IPSLA, but I think it does exactly what you want. You can define a wide variety of metrics including HTTP performance, up/down, etc. to then make decisions for alternate routes, etc. See here: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipsla/configuration/15-mt/sla-15-mt-book/sla_overvi... Opens a new window
and here for a basic example to ping some address an failover if it does not respond: https://supportforums.cisco.com/document/30296/using-ipsla-change-routing Opens a new window
