H3C Technologies H3C S12500 Series Switches - Manual (Page 159)

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• Real MAC address of an interface—In case that an IP address owner exists in a VRRP group, if the
virtual IPv6 address is mapped to the virtual MAC address, two MAC addresses are mapped to one
IPv6 address. To avoid such as problem, map the virtual IPv6 address of the VRRP group to the real
MAC address of an interface to forward the packets from a host to the IP address owner.
To specify the type of MAC addresses mapped to virtual IPv6 addresses:
Step Command Remarks
1. Enter system view. system-view N/A
2. Specify the type of MAC
addresses mapped to virtual
IPv6 addresses.
vrrp ipv6 method { real-mac |
virtual-mac } Optional.
Virtual MAC address by default.
NOTE:
When VRRP is operating in load balancing mode, a virtual IPv6 address is always mapped to a virtual
MAC address regardless of which type of MAC addresses are specified to be mapped to virtual IPv6
addresses.
Creating a VRRP group and configuring a virtual IPv6 address
IMPORTANT:
Do not create VRRP groups on the VLAN interface of a super VLAN. Otherwise, network performance
might be affected.
When creating a VRRP group, configure a virtual IPv6 address for the VRRP group. You can configure
multiple virtual IPv6 addresses for a VRRP group.
A VRRP group is automatically created when you specify the first virtual IPv6 address for the VRRP group.
If you specify another virtual IPv6 address for the VRRP group later, the virtual IPv6 address is added to
the virtual IPv6 address list of the VRRP group.
Configuration prerequisites
Before creating a VRRP group and configuring a virtual IPv6 address on an interface, configure an IPv6
address for the interface and make sure that it is in the same network segment as the virtual IPv6 address
to be configured.
Configuration guidelines
When you create a VRRP group and configure its virtual IPv6 address, follow these guidelines:
• When a router is the IP address owner in a VRRP group, H3C recommends not using the IPv6
address of the interface (virtual IPv6 address of the VRRP group) to establish an OSPFv3 neighbor
relationship with the adjacent router, which means not using the ospfv3 area command to enable
OSPFv3 on the interface. For more information about ospfv3 area command, see Layer 3—IP
Routing Command Reference.
• When VRRP is operating in load balancing mode, the virtual IPv6 address of a VRRP group cannot
be the same as the IPv6 address of any interface in the VRRP group. In other words, a VRRP group
does not have an IP address owner in load balancing mode.
• You can create up to 16 VRRP groups on an interface and assign up to 16 virtual IPv6 addresses in
a VRRP group.