H3C Technologies H3C S7500E Series Switches - Manual (Page 148)

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Specifying the Type of MAC Addresses Mapped to Virtual IPv6 Addresses
After you specify the type of MAC addresses mapped to the virtual IPv6 address of VRRP
groups and create a VRRP group, the master in the VRRP group uses the specified type of
MAC address as the source MAC address for sending packets so that the hosts in the internal
network can learn the mapping between the IPv6 address and the MAC address and thus
forward the packets destined to other network segments to the master.
Two types of MAC addresses are available to be mapped to the virtual IPv6 address of a VRRP
group:
z Virtual MAC address
By default, a virtual MAC address is automatically created for a VRRP group when the VRRP
group is created, and the virtual IPv6 address of the VRRP group is mapped to the virtual MAC
address. When such a mapping is adopted, the hosts in the internal network do not need to
update the mapping between the IPv6 address and the MAC address when the master
changes.
z 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.
Follow these steps to specify the type of MAC addresses mapped to virtual IPv6 addresses:
To do… Use the command… Remarks
Enter system view system-view —
specify the type of MAC
addresses mapped to virtual
IPv6 addresses
vrrp ipv6 method { real-mac |
virtual-mac }
Optional
Virtual MAC address by default
Specify the type of the MAC addresses mapped to the virtual IPv6 addresses before creating a
VRRP group. Otherwise, you cannot change the type of the MAC addresses mapped to virtual
IPv6 addresses.
Creating a VRRP Group and Configuring a Virtual IPv6 Address
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.