Creating a VRRP group and assigning a virtual IP address
A VRRP group can operate correctly after you create it and assign a minimum of one virtual IP address to it. You can configure multiple virtual IP addresses for the VRRP group on an interface that connects to multiple subnets for router backup on different subnets.
Configuration guidelines
The maximum number of VRRP groups supported by an interface and the maximum number of virtual IP addresses supported by a VRRP group depend on the device model.
In VRRP load balancing mode, the device supports a maximum of MaxVRNum/N VRRP groups. MaxVRNum refers to the maximum number of VRRP groups supported by the device in VRRP standard mode. N refers to the number of devices in the VRRP group.
When VRRP is operating in standard mode, the virtual IP address of a VRRP group can be either of the following addresses:
Unused IP address on the subnet where the VRRP group resides.
IP address of an interface on a router in the VRRP group.
In load balancing mode, the virtual IP address of a VRRP group can be any unassigned IP address of the subnet where the VRRP group resides. It cannot be the IP address of any interface in the VRRP group. No IP address owner can exist in a VRRP group.
On an IP address owner, as a best practice, do not use the network command to enable OSPF on the interface owning the virtual IP address of the VRRP group. For more information about the network command, see Layer 3—IP Routing Command Reference.
If you create an IPv4 VRRP group without assigning virtual IP address to it, the VRRP group stays in inactive state and does not function.
Removal of the VRRP group on the IP address owner causes IP address collision. To avoid the collision, change the IP address of the interface on the IP address owner before you remove the VRRP group from the interface.
The virtual IP address of an IPv4 VRRP group and the downlink interface IP address of the VRRP group must be in the same subnet. Otherwise, the hosts in the subnet might fail to access external networks.
Configuration procedure
To create a VRRP group and assign a virtual IP address:
Step | Command | Remarks |
|---|---|---|
1. Enter system view. | system-view | N/A |
2. Enter interface view. | interface interface-type interface-number | N/A |
3. Create a VRRP group and assign a virtual IP address. | vrrp vrid virtual-router-id virtual-ip virtual-address | By default, no VRRP groups exist. |