Multiplex communications – Fault recovery – Bypass an inoperative station
Reexamination Certificate
2011-08-02
2011-08-02
Moe, Aung S (Department: 2474)
Multiplex communications
Fault recovery
Bypass an inoperative station
C370S244000
Reexamination Certificate
active
07990850
ABSTRACT:
Embodiments disclosed herein provide redundant connectivity between an Ethernet Automatic Protection Switching (EAPS) access network and a Virtual Private LAN Service (VPLS) network. A first VPLS node is provided to function as an EAPS controller node. A second VPLS node is provided to function as an EAPS partner node. The first and second VPLS nodes are linked by a pseudowire and an EAPS shared-link. Additional EAPS nodes are also provided. The additional EAPS nodes are linked to each other and one of the additional EAPS nodes is designated as a master node. Links are also established between the VPLS nodes and the EAPS nodes such that one or more EAPS rings are formed. Each EAPS ring includes the shared-link between the first and second VPLS nodes. The EAPS rings are monitored to detect link failures. When a failure of the pseudowire shared-link between the first and second VPLS nodes is detected, all pseudowire links associated with the first VPLS node are disabled if any of the EAPS nodes has a path to both of the VPLS nodes. Otherwise, the existing pseudowire links associated with the first VPLS node are maintained.
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Lim Arnel
Shah Sunil P.
Stokes Olen L.
Blakely , Sokoloff, Taylor & Zafman LLP
Extreme Networks, Inc.
Haile Feben
Moe Aung S
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