Exclusion routes in border gateway protocol (bgp) routers

Details Exclusion routes in border gateway protocol (bgp) routers Exclusion routes in border gateway protocol (bgp) routers

H - Electricity

04

L

H04L 12/56 (2006.01) H04L 12/24 (2006.01)

Patent

CA 2308697

Efficient control of packet forwarding by a router is enabled by storing in a forwarding table information explicitly identifying exclusion routes to which packets may not be forwarded. An exclusion route includes the same attributes as a conventional "inclusionary" route, and thus will be returned from a forwarding table for any matching packets using conventional best-match algorithms. The exclusion route is identified by a zero fill of its Next Hop attribute, which indicates that the exclusion route is inaccessible. Any packets matching an exclusion route are discarded. This permits access control to selected addresses in the network space.

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