Fault-tolerant IS-IS routing system, and a corresponding method

Details Fault-tolerant IS-IS routing system, and a corresponding method Fault-tolerant IS-IS routing system, and a corresponding method

2006-12-26

2006-12-26

Jean, Frantz B. (Department: 2151)

Electrical computers and digital processing systems: multicomput

Computer-to-computer data routing

Routing data updating

C709S238000, C709S239000, C709S244000, C370S433000

Reexamination Certificate

active

07155536

ABSTRACT:
The invention provides a high availability control method for a router in an autonomous system, the router being in communication with other routers using an IS—IS protocol via interfaces and presenting both an active IS—IS protocol engine and a standby IS—IS protocol engine. The method comprises steps of storing data concerning adjacency, the state of links, and interfaces in a memory of the active protocol engine, updating the data stored in a memory of the standby protocol engine, and activating the standby protocol engine using the updated data. The invention also provides a router implementing the method. The invention serves to increase router availability in the event of a failure or of maintenance actions.

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R. Callon, “Use of OSI IS-IS for routing in TCP/IP and Dual Environments” RFC 1195, Dec. 1990, pp. 1-84 XP002206496.

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