3Com 7757 Configuration Manual page 561

VRRP Configuration Example 561
# Configure the preemptive mode for the backup group.
[LSW-A-Vlan-interface2] vrrp vrid 1 preempt-mode
Configure Switch B.
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# Configure VLAN 2.
<LSW-B> system-view
[LSW-B] vlan 2
[LSW-B-Vlan2] port Ethernet 1/0/5
[LSW-B-vlan2] quit
[LSW-B] interface Vlan-interface 2
[LSW-B-Vlan-interface2] ip address 202.38.160.2 255.255.255.0
[LSW-B-Vlan-interface2] quit
# Enable a backup group to respond to ping operations destined for its virtual
router IP address.
[LSW-B] vrrp ping-enable
# Create a backup group.
[LSW-B] interface Vlan-interface 2
[LSW-B-Vlan-interface2] vrrp vrid 1 virtual-ip 202.38.160.111
# Configure the preemptive mode for the backup group.
[LSW-B-Vlan-interface2] vrrp vrid 1 preempt-mode
The IP address of the default gateway of Host A can be configured to be
202.38.160.111.
Normally, Switch A functions as the gateway, but when Switch A is turned off or
malfunctions, Switch B will function as the gateway instead.
Configure Switch A to operate in preemptive mode, so that it can resume its
gateway function as the master switch after recovery.
VRRP Tracking Interface Network requirements
Configuration
Even when Switch A is still functioning, Switch B (with another link to connect
with the outside) can function as a gateway when the interface on Switch A and
connecting to Internet does not function properly. This can be implemented by
enabling the VLAN interface tracking function.
The VRRP backup group ID is set to 1, with configurations of authorization key
and timer.