How to enable Backup switch to monitor the Master switch in vrrp by using track and bfd technology
[Switch Backup] bfd echo-source-ip ip-add
[Switch Backup] track id bfd echo interface vlan-interface id remote ip ip-add local ip ip-add
[Switch Backup] interface vlan-interface id
[Switch Backup-Vlan-interfaceid] vrrp vrid id track id switchover
[Switch Backup-Vlan-interfaceid] return