H3C Technologies H3C SecBlade LB Cards - Manual (Page 30)

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Creating a VRRP group and configuring virtual IP address
1. Configuration guidelines
• 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.
• The VRRP group is automatically created when you specify the first virtual IP address. If you later
specify another virtual IP address for the VRRP group, the virtual IP address is added to the virtual
IP address list of the VRRP group.
• The virtual IP address assigned to the VRRP group must be a legal host address and in the same
subnet as the interface IP address. If not, the state of the VRRP group is always initialize and VRRP
does not take effect. For example, although you can successfully configure a network address or
broadcast address as the virtual IP address of a VRRP group, the group cannot work.
• When VRRP operates 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 the latter case, the router is called the IP address owner.
• When a router is the IP address owner in a VRRP group, H3C recommends you 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 Network Management Command Reference.
• In load balancing mode, the virtual IP address of a VRRP group cannot be the same as the IP
address of any interface in the VRRP group.
• A VRRP group is removed after you remove all its virtual IP addresses, and all its configurations
become invalid.
• 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 a VRRP group cannot be 0.0.0.0, 255.255.255.255, loopback addresses,
non-class A/B/C addresses or other illegal IP addresses such as 0.0.0.1.
• Do not create VRRP groups in the VLAN interface of a super VLAN. Otherwise, network
performance might be affected.
2. Configuration prerequisites
Before creating a VRRP group and configuring a virtual IP address on an interface, configure an IP
address for the interface and make sure that it is in the same subnet as the virtual IP address.
3. Configuration procedure
To create a VRRP group and configure a virtual IP address:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter the specified interface
view.
interface interface-type
interface-number
N/A
3. Create a VRRP group and
configure a virtual IP address
for the VRRP group.
vrrp vrid virtual-router-id virtual-ip
virtual-address VRRP group is not created by
default.