3Com S7906E - Switch, Configuration Manual

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By default, a MAC address is created for a VRRP group after the VRRP group is created, and the virtual
IP address is associated with the virtual MAC address. With such association adopted, the hosts in the
internal network do not need to update the association between IP address and MAC address when the
master changes.
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Virtual IP address is associated with real MAC address of the interface
If an IP address owner exists in a VRRP group and you associate the virtual IP address with the virtual
MAC address, two MAC addresses are associated with an IP address. In this case, you can associate
the virtual IP address of the VRRP group with the real MAC address, so that the packets from a host are
forwarded to the IP address owner according the real MAC address.
Follow these steps to configure the association between MAC address and virtual IP address:
To do… Use the command… Remarks
Enter system view system-view —
Configure the association
between virtual IP address and
MAC address
vrrp method { real-mac |
virtual-mac }
Optional
The virtual MAC address is
associated with the virtual IP
address by default.
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When VRRP works in the load balancing mode, the association between the virtual IP address and
the MAC address can be configured but is not effective. In this mode, the virtual IP address is
always associated with the virtual MAC address.
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You should configure this function before creating a VRRP group. Otherwise, you cannot modify
the mapping between the virtual IP address and the MAC address.
Configuring VRRP Working Mode
VRRP works in one of the following two modes:
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Standard protocol mode: In a VRRP group, only the master forwards packets.
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Load balancing mode: In a VRRP group, all routers (master and backups) that have AVF can
forward packets to realize load balancing.
After you configure the working mode of a VRRP group, all VRRP groups on the router work in the same
mode. Follow these steps to configure the VRRP working mode:
To do… Use the command… Remarks
Enter system view system-view —
Configure VRRP to work in the
standard protocol mode
undo vrrp mode
Optional
By default, VRRP works in the
standard protocol mode.
Configure VRRP to work in the
load balancing mode
vrrp mode load-balance
Optional
By default, VRRP works in the
standard protocol mode.