Multiplex communications – Fault recovery – Bypass an inoperative switch or inoperative element of a...
Reexamination Certificate
2007-04-24
2007-04-24
Pezzlo, John (Department: 2616)
Multiplex communications
Fault recovery
Bypass an inoperative switch or inoperative element of a...
C370S242000, C370S386000
Reexamination Certificate
active
10124449
ABSTRACT:
Systems and methods are described for providing network route redundancy through Layer 2 devices, such as a loop free Layer 2 network having a plurality of switching devices. A virtual switch is coupled to the loop free Layer 2 network, the virtual switch having two or more switches configured to transition between master and backup modes to provide redundant support for the loop free Layer 2 network, the switches communicating their status through use of a plurality of redundancy control packets. The system also includes means for allowing the redundancy control packets to be flooded through the Layer 2 network. The means may include time-to-live data attached to the redundancy control packet which is decremented only when the packets are transferred through devices which are configured to recognize the protocol used in redundancy control packets.
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Hsu Ivy Pei-Shan
Jalan Raikumar
Kamat Gurudeep
Kuo Andrew Tai-Chin
Moncada-Elias Jordi
Foundry Networks Inc.
Pezzlo John
Townsend and Townsend / and Crew LLP
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