Q. Is prefix splitting supported with Cisco Performance Routing? If so, how is it done?
A. Yes. Prefix splitting means that a more specific route is derived from a prefix (for example, splitting a host route [/32] from a /24 prefix). If you configure a /24 prefix to be optimized but Cisco Performance Routing finds only /16 route in the routing table, it injects a /24 route with the new exit link using the attributes from the /16 route. This injection affects only the internal routes, and this new information is not propagated outside the autonomous system. If you configure a prefix and Performance Routing finds only a default route for it (from any Border Router), the following occurs:
- If BGP is not running, a new static route is injected.
- If BGP is running, a new BGP route is injected.
If this statement is true, then does it mean that we can not have split tunnel for local internet breakout? As local internet break-out will have default route to another interface and if for any reason no specific route is found from the alternate interface then traffic will be directed to internet.
Please suggest.
