Creating and applying VRRP policies are optional.
Backup command:
The backup IP addresses must be on the same subnet. The backup addresses explicitly define which IP addresses are in the VRRP advertisement message IP address list.
In the owner mode, the backup IP address must be identical to one of the interface’s IP addresses. The backup address explicitly defines which IP addresses are in the VRRP advertisement message IP address list.
For IPv6, one of the backup addresses configured must be the link-local address of the owner VRRP instance.