Fast failure protection using redundant network edge ports

Details Fast failure protection using redundant network edge ports Fast failure protection using redundant network edge ports

2005-07-12

2005-07-12

Cuchlinski, Jr., William A. (Department: 2144)

Electrical computers and digital processing systems: multicomput

Computer-to-computer data routing

C709S208000, C709S226000, C709S209000, C709S239000, C707S793000, C370S396000, C370S252000, C370S352000, C370S389000

Reexamination Certificate

active

06917986

ABSTRACT:
A method for fast protection in a fault-tolerant network includes coupling an edge switch in a network to one or more access switches via at least first and second redundant links, respectively connected to first and second ports of the edge switch. The first port is placed in an active state, while the second port is placed in a blocking state, so that communication traffic is conveyed over the first link, and each of the switches builds a respective database for use in forwarding the traffic. Responsive to a failure associated with the first link, the second port is placed in the active state and the first port is placed in the blocking state. Dummy traffic is then sent from the edge switch over the second link to the one or more access switches, so as to cause each of the one or more access switches to modify its respective database responsive to the second port being in the active state.

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“IEEE Standard for Information Technology, Telecommunications and Information Exchange between Systems, Local and Metropolitan Area Network, Common Specifications, Part 3: Media Access Control (MAC) Bridges”, Published as ANSI/IEEE Standard 802.1D (1998). Available at: standards.ieee.org/catalog/IEEE802.1.html.

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