Usage Scenario
Common VRRP is multicast VRRP and only allows VRRP Advertisement packets to be multicast. Multicast VRRP Advertisement packets, however, can be forwarded within only one broadcast domain (for example, one VLAN or VSI). Therefore, common VRRP groups apply only to Layer 2 networks. This limitation means that common VRRP does not apply to devices on a Layer 3 network that need to negotiate their master/backup status using VRRP.
You can configure a unicast VRRP group to meet this requirement. Unicast VRRP is a Huawei proprietary protocol based on VRRPv2. After a unicast VRRP group is configured on two devices on a Layer 3 network, the master device in this group sends unicast VRRP Advertisement packets to the backup device through the Layer 3 network, implementing the master/backup status negotiation between the two devices.
Configuration Impact
After a unicast VRRP group is configured, this group cannot be changed to a common VRRP group.
Precautions
- It is recommended to configure the source IP address. Otherwise, the device will listen to all packets of the configured port, which may cause security risks.
- The peer IP address and source IP address cannot be the same.