IP bearer network often uses VRRP to connect softswitch device. The minimum interval of VRRP sending packet is 1S. If the packet is not received in three times, it will switch over VRRP state. The switchover time is about 3S. For the voice and signaling service of softswitch, 3S is not enough. How to ensure VRRP rapid switchover?
VRRP can trace BFD Session to realize master/backup switchover.
Realization: BFD session is set up with VRRP interface address between Master and Backup. Trace BFD Session in VRRP configuration.
Detailed configuration: vrrp vrid 1 track bfd-session 2 increased 40 // vrrp group one traces bfd-session 2. If BFD Session state is Down, VRRP priority of Backup increases 40 and changes as master. Rapid switchvoer is realized.
The source address and destination address of BFD must be in routing table of public network. Interface address of VPN cannot realize it.