Multiplex communications – Pathfinding or routing – Switching a message which includes an address header
Reexamination Certificate
2004-07-15
2010-06-08
Yao, Kwang B (Department: 2473)
Multiplex communications
Pathfinding or routing
Switching a message which includes an address header
C370S236000
Reexamination Certificate
active
07733856
ABSTRACT:
Path information is obtained in a VPLS-based network by generating special Layer 2 frames (referred to herein as “trace-request frames”), performing source MAC filtering to identify the trace-request frames, and generating a special frame (referred to herein as a “trace-reply frame”) when the source MAC filtering identifies a trace-request frame. Upon identifying a trace-request frame, path information is collected and embedded into the trace-reply frame. The trace-reply frame is then sent to the originating node where the path information is used to learn the path that the trace-request frame traversed. By sending multiple trace-request frames with different source MAC addresses, path information received from source MAC filtering at different nodes in the VPLS-based network can be collected and used to learn an entire path of interest.
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Hongal Thippanna
Ishwar Prashanth
Kasralikar Rahul S.
Ramakrishnan Ramanaravanan
Rigby John
Alcatel-Lucent USA Inc.
Bokhari Syed
Wilson & Ham
Yao Kwang B
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