3Com 8807 Configuration Manual page 663

VRRP Configuration Example 663
# Track an interface.
[LSW_A-vlan-interface2] vrrp vrid 1 track vlan-interface 3 reduced 30
Configure switch B
# Configure VLAN2.
[LSW-B] vlan 2
[LSW-B-vlan2] interface vlan 2
[LSW-B-vlan-interface2] ip address 202.38.160.2 255.255.255.0
[LSW-B-vlan-interface2] quit
# Enable the function to ping the virtual IP address of virtual router.
[3ComLSW-B] vrrp ping-enable
# Create a virtual router.
[LSW-B] interface vlan 2
[LSW_B-vlan-interface2] vrrp vrid 1 virtual-ip 202.38.160.111
# Set the authentication key for the virtual router.
[LSW_B-vlan-interface2] vrrp authentication-mode md5 switch
# Set Master to send VRRP packets every 5 seconds.
[LSW_B-vlan-interface2] vrrp vrid 1 timer advertise 5
Under normal conditions, switch A functions as the gateway, but when the
interface vlan-interface 3 of switch A is down, its priority will be reduced by 30,
lower than that of switch B so that switch B will preempt the Master for gateway
services instead.
When vlan-interface3, the interface of switch A, recovers, this switch will resume
its gateway function as the Master.
Multiple Virtual Routers Networking requirements
Example
A Switch can function as the backup switch for many virtual routers.
Such a multi-backup configuration can implement load balancing. For example,
switch A as the Master switch of virtual router 1 can share the responsibility of the
backup switch for virtual router 2 and vice versa for switch B. Some hosts employ
virtual router 1 as the gateway, while others employ virtual router 2 as the
gateway. In this way, both load balancing and mutual backup are implemented.
Networking diagram
Refer to Figure 158.
Configuration Procedure
Configure switch A
# Configure VLAN2.