Patent ID: 7787396

Claim:
A method of building an Outbound Route Filtering (ORF) filter comprising: receiving, from a first route reflector, an ORF list at a second route reflector, said ORF list comprising multiple ORF entries received from at least one client by said first route reflector; and building, with said second route reflector, an ORF filter towards said first route reflector from said ORF list received from said first route reflector; wherein building, with said second route reflector, the ORF filter towards said first route reflector from said ORF list received from said first route reflector comprises: receiving an ORF-list from an internal non-client peer; building an ORF Outbound Route Filter toward an advertising internal peer based on the received ORF list; generating an ORF-list based on ORF-entries received from client peers and ORF-lists received from external non-client peers; setting an Autonomous System number in route-target entries of the ORF-list to a local Autonomous System number; and advertising the resulting ORF list to all non-client peers.