Routing system and method for synchronizing a routing system...

Multiplex communications – Fault recovery – Bypass an inoperative switch or inoperative element of a...

Reexamination Certificate

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C370S236000

Reexamination Certificate

active

10293162

ABSTRACT:
A routing system provides for transparent routing system failover by checkpointing route prefixes during normal operation by maintaining a route prefix table. After failure of a primary routing processor, routing with peer routing systems is synchronized through the use of this prefix table. The prefix table is managed by the primary routing processor and is accessible by a backup routing processor at least after failure of the primary routing processor. Upon the detection of a failure, a backup routing processor solicits routes from peer routing systems in response to the failure and generates a backup routing database from the routes received from peer routing systems. The backup routing processor also compares prefixes of routes in the backup routing database with prefixes in the prefix table, and sends route withdraw messages to the peer routing systems for routes having prefixes listed in the prefix table and not identified in the backup routing database.

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patent: 6151315 (2000-11-01), Ash et al.
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patent: 6286048 (2001-09-01), Moberg
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patent: 1189384 (2002-03-01), None
Rekhter, Y., et al., “A Border Gateway Protocol 4, (BGP-4)”,Network Working Group, RFC 1771, (1995),pp. 1-46.
RFC2918—Route Refresh Capability for BGP-4; Internet NFC/STD/FYI/BCP Archives, © 2000, The Internet Society (4 pgs).
Chen, E., “Route Refresh Capability for BGP-4”,Network Working Group—Request for Comments: 2918, Category: Standards Track,(Sep. 2000),1-4.

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