H3C Technologies H3C S10500 Series Switches - Manual (Page 140)

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Task Remarks
Specifying the type of MAC addresses mapped to virtual IP addresses Optional
Creating a VRRP group and configuring virtual IP address Required
Configuring router priority, preemptive mode and tracking function Optional
Configuring VRRP packet attributes Optional
Enabling the trap function for VRRP Optional
Specifying the type of MAC addresses mapped to virtual IP
addresses
After you specify the type of MAC addresses mapped to the virtual IP addresses 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 and uses the specified type of MAC address to answer ARP requests
from hosts so that the hosts in the internal network can learn the mapping between the IP address and the
MAC address.
The following types of MAC addresses are available to be mapped to the virtual IP address of a VRRP
group:
• 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 IP 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 IP address and MAC address when the master changes.
• Real MAC address of an interface—In case that an IP address owner exists in a VRRP group, if the
virtual IP address is mapped to the virtual MAC address, two MAC addresses are mapped to one
IP address. To avoid such as problem, map the virtual IP 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 IP addresses:
To do… Use the command… Remarks
Enter system view system-view —
Specify the type of MAC addresses
mapped to virtual IP addresses vrrp method { real-mac |
virtual-mac } Optional
Virtual MAC address by default
NOTE:
•
Specify the type of the MAC addresses mapped to the virtual IP addresses before creating a VRRP
group. Otherwise, you cannot change the type of the MAC addresses mapped to virtual IP addresses.
• If VRRP groups with the same ID are created on multiple interfaces of a device, and the VRRP
advertisements of these VRRP groups are to be sent through QinQ networks, H3C recommends you to
map the real MAC addresses of the interfaces to the virtual IP addresses of these VRRP groups.
Otherwise, the VRRP advertisements of these VRRP groups cannot be sent successfully.