IS-IS high availability design

Details IS-IS high availability design IS-IS high availability design

2007-09-11

2007-09-11

Ramos-Feliciano, Eliseo (Department: 2609)

Multiplex communications

Fault recovery

Bypass an inoperative switch or inoperative element of a...

C714S004110, C709S238000

Reexamination Certificate

active

10233704

ABSTRACT:
The HA IS-IS system provides a redundant backup IS-IS protocol instance that can seamlessly assume the function of the active IS-IS instance in the event of active MCP failure. Once the backup is online, the active synchronizes its global, interface, adjacency, neighbor, and LSP system state information. In the ongoing synchronization phase, the active and the backup maintain synchronization using a combination of explicit message updates from active to backup together with message flow-through. In the recovery phase, the operating system detects the failure of the active and notifies the backup, which assumes the active function as a standalone system without reconfiguring or interrupting traffic among peer network routers, and starts computing forwarding tables and updating routing tables.

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