127
Step Command Remarks
3. Specify the version of
VRRP.
vrrp version
version-number
By default, VRRPv3 is used.
Creating a VRRP group and assigning a virtual IP address
A VRRP group can operate correctly after you create it and assign at least 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
• 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, and 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 an unused IP address on the subnet where the VRRP group resides or the 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, rather than the IP address of any
interface in the VRRP group. No IP address owner can exist in a VRRP group.
• When a router is the IP address owner in a VRRP group, do not configure the network
command on the interface to use the IP address of the interface, or the virtual IP address of the
VRRP group, to establish a neighbor relationship with the adjacent router. For more information
about the network command, see Layer 3—IP Routing Command Reference.
• If you create an IPv4 VRRP group but do not assign any virtual IP address for 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 group
exists.
Configuring the router priority, preemptive mode, and
tracking function
The router priority determines which router in the VRRP group acts as the master. The preemptive
mode enables a backup to take over as the master when it detects that it has a higher priority than
the current master. The tracking function decreases the router priority or enables the backup to take
over as the master when the state of the monitored track entry transits to Negative.
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