Chi Ming Ho

US Patent:

7093160, Aug 15, 2006

Filed:

May 3, 2002

Appl. No.:

10/139065

Inventors:

Chun-Hung Lau - Foster City CA, US
Chi Fai Ho - Sunnyvale CA, US
Vishal Murgai - San Jose CA, US

Assignee:

Nokia Corporation - Espoo

International Classification:

G06F 11/00

US Classification:

714 11, 370219

Abstract:

The present invention relates to a method and system for implementing protocol redundancy in a router. In particular, the invention relates to providing redundancy of multi protocol label switching (MPLS). In one aspect, the present invention provides MPLS redundancy wherein all protocol states are mirrored. An active processor provides MPLS operations. In the present invention, a standby processor is coupled to the active processor. During the initial synchronization, all protocol information from the active processor is forwarded to the standby processor. The protocol information can include event information and state information. Thereafter, any updates of protocol information are immediately forwarded to the standby processor in an orderly and controlled manner. Upon failure of the active processor, the standby processor takes over as the active processor. All MPLS protocol operations are performed on the new active processor.