Method and apparatus for learning VRRP backup routers

摘要

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.