Multiplex communications – Pathfinding or routing – Switching a message which includes an address header
Reexamination Certificate
2006-04-04
2006-04-04
Duong, Frank (Department: 2666)
Multiplex communications
Pathfinding or routing
Switching a message which includes an address header
C370S397000, C370S399000, C370S395500
Reexamination Certificate
active
07023846
ABSTRACT:
A system, device, and method for establishing and removing a label switched path in a communication network uses a packet-driven mechanism rather than using an explicit signaling protocol to exchange label switching information from an upstream label switching device to a downstream label switching device. In order to establish a label switched path from the upstream label switching device to the downstream label switching device, the upstream label switching device allocates a new label for the label switched path, sets up the label switched path by adding the new label to its forwarding table, and forwards a labeled packet including the new label and an indicator indicating that the packet is labeled. Upon receiving the labeled packet from the upstream label switching device, the downstream label switching device sets up the label switched path by adding the new label to its forwarding table, and forwards the packet based upon network layer addressing information in the packet. In order to remove the label switched path, the upstream label switching device forwards unlabeled packets to the downstream label switching device, and both devices remove the label from its respective forwarding table.
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Andersson Loa
Madsen Tove
Sundell Kenneth
Duong Frank
McGuiness & Manaras LLP
Nortel Networks Limited
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