I have read through countless posts on my question and have gleaned a lot of information from them.
My scenario is this.
We have a 6500 core connected to two ASA's in active/standby mode. The ASAs are connected to two 3550 switches which are providing BGP pairing with each other and our ISPs Internet links, both 1Gb/s one to each switch, running as primary/backup. The ASA has a default route to the HSRP address shared by the switches.
We have cause to allocate a subnet from our range to a third party temporarily. I would like to route this subnet through the backup link (outgoing and incoming)
I can configure BGP to route accordingly, but this will only apply for incoming traffic.
I could put a route-map on on of the 3550's to reroute traffic based on source ip to use the other switch/backup link, but this will waste bandwidth on the switch interface.
Any other ideas how I can push one subnet out of one switch, and the rest through the other?
Many thanks for reading,