Method and apparatus for learning VRRP backup routers

Details Method and apparatus for learning VRRP backup routers Method and apparatus for learning VRRP backup routers

2011-04-19

2011-04-19

Hsu, Alpus H (Department: 2465)

Multiplex communications

Fault recovery

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

C370S255000, C370S392000, C370S409000, C709S208000, C709S221000, C709S223000, C714S004110

Reexamination Certificate

active

07929420

ABSTRACT:
A method and apparatus for learning the identity of VRRP backup router(s) for a VRRP master router enables the identity of VRRP backup routers to be determined quickly on demand, or enables a table of VRRP master and backup routers to be established over time. A VRRP query message type is defined as a type of VRRP message that will enable the routers on the network to be queried to determine which router(s) are VRRP backup routers for a virtual IP address associated with a VRRP master. The VRRP query message may be initiated by the VRRP master, a network management system, or another entity. The VRRP backup routers may respond with a VRRP response message, which is also defined as a type of VRRP message. The VRRP response message may be unicast to the VRRP master or network management system, or broadcast to enable a table of VRRP master/backup routers to be created.

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