3Com Switch 7700 Configuration Manual page 327

Example: VRRP Tracking
Interface
1 Create a virtual router.
2 Set the priority for the virtual router.
3 Set the authentication key for the virtual router.
Figure 3 VRRP Configuration
VLAN-interface3: 10.100.10.2
Switch A
VLAN-interface2: 202.38.160.1
Configure switch A:
[SW7700_A-vlan-interface2] vrrp vrid 1 virtual-ip 202.38.160.111
[SW7700_A-vlan-interface2] vrrp vrid 1 priority 110
Configure switch B:
[SW7700_B-vlan-interface2] vrrp vrid 1 virtual-ip 202.38.160.111
The virtual router can be used after all routers in the group are configured. The
host A default gateway should be configured as 202.38.160.111.
Under normal conditions, switch A functions as the gateway, but when switch A is
turned off or is malfunctioning, switch B functions as the gateway instead.
Even when switch A is still functioning, it may want Switch B to function as a
gateway if a critical interface connected with it does not function properly. This
can be implemented by configuring a tracking interface. The virtual router ID is set
to 1 with additional configurations of an authorization key and timer.
Configure switch A
[SW7700_A-vlan-interface2] vrrp vrid 1 virtual-ip 202.38.160.111
[SW7700_A-vlan-interface2] vrrp vrid 1 priority 110
[SW7700_A-vlan-interface2] vrrp authentication-mode md5 lanswitch
Host B
10.2.3.1
Internet
Virtual IP address: 202.38.160.111
Host A
202.36.160.3
Configuring VRRP 319
Switch B
VLAN-interface2: 202.38.160.2