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In the context of network routing, route filtering is the process by which certain routes are not considered for inclusion in the local route database, or not advertised to one's neighbours. Route filtering is particularly important for the Border Gateway Protocol on the global Internet, where it is used for a variety of reasons. One way of doing route filtering with external-resources in practice is using Routing Policy Specification Language in combination with Internet Routing Registry databases.
Border Gateway Protocol Outbound Route Filtering Using Community Attribute
Systems and methods for border gateway protocol (BGP) outbound route filtering (ORF) using community attribute include, responsive to tagging one or more prefixes in border gateway protocol (BGP) with one or more community attributes for outbound route filtering (ORF) in a network, transmitting a single route refresh message with the one or more community attributes to a BGP peer router for purposes of the BGP peer router applying the ORF based on the one or more community attributes; and receiving prefixes from the BGP peer router based on the ORF applied at the BGP peer router.
Owner:CIENA CORP