3.7.d Implement, optimize and troubleshoot routing policies

3.7.d [iii] Outbound route filtering

The BGP Prefix-Based Outbound Route Filtering feature uses Border Gateway Protocol (BGP) outbound route filter (ORF) send and receive capabilities to minimize the number of BGP updates that are sent between BGP peers. Configuring this feature can help reduce the amount of system resources required for generating and processing routing updates by filtering out unwanted routing updates at the source.

For example, this feature can be used to reduce the amount of processing required on a router that is not accepting full routes from a service provider network.

Adam, Paul (2014-07-12). All-in-One CCIE V5 Written Exam Guide (Kindle Locations 3986-3987).  . Kindle Edition.

http://www.cisco.com/c/en/us/td/docs/ios/12_2s/feature/guide/fsbgporf.html