Multiplex communications – Pathfinding or routing – Switching a message which includes an address header
Reexamination Certificate
2011-04-12
2011-04-12
Kumar, Pankaj (Department: 2467)
Multiplex communications
Pathfinding or routing
Switching a message which includes an address header
Reexamination Certificate
active
07924836
ABSTRACT:
A method of installing forwarding state in a link state protocol controlled network node having a topology database representing a known topology of the network, and at least two ports for communication with corresponding peers of the network node. A unicast path is computed from the node to a second node in the network, using the topology database, and unicast forwarding state associated with the computed unicast path installed in a filtering database (FDB) of the node. Multicast forwarding state is removed for multicast trees originating at the second node if an unsafe condition is detected. Subsequently, a “safe” indication signal is advertised to each of the peers of the network node. The “safe” indication signal comprises a digest of the topology database. A multicast path is then computed from the network node to at least one destination node of a multicast tree originating at the second node. Finally, multicast forwarding state associated with the computed multicast path is installed in the filtering database (FDB) of the network node, when predetermined safe condition is satisfied.
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Allan David
Bragg Nigel
Chiabaut Jerome
Blake Cassels & Graydon LLP
Daniels Kent
Kumar Pankaj
Nortel Networks Limited
Sharma Gautam
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