H3C Technologies H3C MSR 50 - Manual (Page 75)

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Step Command Remarks
54. Enter interface view. interface interface-type interface-number N/A
55. Specify the version of
VRRP.
vrrp version version-number
Optional.
By default, VRRPv2 is used.
Specifying the type of MAC addresses mapped to virtual IP
addresses
You can configure VRRP in standard mode to map real or virtual MAC addresses to the virtual IP
addresses of VRRP groups, so the master in a VRRP group uses the specified type of MAC address as the
source MAC address for sending packets and answering ARP requests.
• Virtual MAC to virtual IP mapping—By default, a virtual MAC address is automatically assigned
when a VRRP group is created, and the virtual IP address of the VRRP group is mapped to the virtual
MAC address. In this mapping method, the hosts do not need to update the gateway IP and MAC
mapping entry when the master changes.
• Real MAC address of an interface—If a VRRP group has an IP address owner, configure real MAC
to virtual IP mapping to avoid the problem of one IP address mapped to two MAC addresses (the
real and the virtual). In this method, the virtual IP address of the VRRP group is mapped to the real
MAC address of the IP address owner, and all packets from hosts are forwarded to the IP address
owner.
If VRRP groups with the same ID are created on multiple interfaces, and the VRRP advertisements of these
VRRP groups are to be sent across a QinQ network, H3C recommends that you use real MAC to virtual
IP mapping to guarantee successful transmission of the VRRP advertisements.
When VRRP operates in load balancing mode, the address mapping setting does not take effect, and
virtual IP addresses are always mapped to virtual MAC addresses.
Specify the type of the MAC addresses mapped to the virtual IP addresses before creating a VRRP group.
You cannot change the address mapping setting after a VRRP group is created.
To specify the type of MAC addresses mapped to virtual IP addresses:
Step Command Remarks
56. Enter system view. system-view N/A
57. Specify the type of MAC
addresses mapped to virtual
IP addresses.
vrrp method { real-mac |
virtual-mac } Optional.
Virtual MAC address by default.
Creating a VRRP group and assigning a virtual IP address
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.