Controlled distribution of inter-area routing information

Details Controlled distribution of inter-area routing information Controlled distribution of inter-area routing information

2005-09-14

2009-06-30

Moe, Aung S (Department: 2416)

Multiplex communications

Pathfinding or routing

Switching a message which includes an address header

C370S241000, C370S248000, C370S252000, C370S254000, C370S351000, C370S389000, C370S395500, C370S400000, C370S408000, C709S232000, C709S238000, C709S242000

Reexamination Certificate

active

07554996

ABSTRACT:
A technique controls distribution of reachability information for a tail-end node of a traffic engineering (TE) label switched path (LSP) to a head-end node of the TE-LSP in a computer network. The TE-LSP preferably spans multiple domains of the network such that the tail-end node resides in a domain (“tail-end domain”) that is different (remote) from the domain of the head-end node (“head-end domain”). According to the inter-domain information distribution technique, the head-end node requests the remote reachability information from the tail-end node, which may employ an Interior Gateway Protocol (IGP) to transmit the information to a border router of the tail-end domain. The tail-end domain border router then shares this information with at least a head-end domain border router. The head-end node thereafter requests that the head-end domain border router release the reachability information into the head-end domain. The head-end node uses the remote information to calculate routes, i.e., address prefixes and associated attributes, reachable from the tail-end node for insertion into its routing table.

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