3Com 4210G Series Configuration Manual page 728

[DeviceC-GigabitEthernet1/0/2] quit
# Create smart link group 1 and configure the smart link group to protect all the VLANs mapped to
MSTIs 0 through 15 for smart link group 1.
[DeviceC] smart-link group 1
[DeviceC-smlk-group1] protected-vlan reference-instance 0 to 15
# Configure GigabitEthernet 1/0/1 as the master port and GigabitEthernet 1/0/2 as the slave port for
smart link group 1.
[DeviceC-smlk-group1] port gigabitethernet 1/0/1 master
[DeviceC-smlk-group1] port gigabitethernet 1/0/2 slave
# Enable the smart link group to transmit flush messages in VLAN 1.
[DeviceC-smlk-group1] flush enable
2) Configuration on Device A
# Enable flush message receiving on GigabitEthernet 1/0/1 and GigabitEthernet 1/0/2 separately.
<DeviceA> system-view
[DeviceA] interface gigabitethernet 1/0/1
[DeviceA-GigabitEthernet1/0/1] smart-link flush enable
[DeviceA-GigabitEthernet1/0/1] quit
[DeviceA] interface gigabitethernet 1/0/2
[DeviceA-GigabitEthernet1/0/2] smart-link flush enable
3) Configuration on Device B
# Create monitor link group 1.
<DeviceB> system-view
[DeviceB] monitor-link group 1
# Configure GigabitEthernet 1/0/1 as an uplink port and GigabitEthernet 1/0/2 as a downlink port for
monitor link group 1.
[DeviceB-mtlk-group1] port gigabitethernet 1/0/1 uplink
[DeviceB-mtlk-group1] port gigabitethernet 1/0/2 downlink
[DeviceB-mtlk-group-1] quit
# Enable flush message receiving on GigabitEthernet 1/0/1 and GigabitEthernet 1/0/2 separately.
[DeviceB] interface gigabitethernet 1/0/1
[DeviceB-GigabitEthernet1/0/1] smart-link flush enable
[DeviceB-GigabitEthernet1/0/1] quit
[DeviceB] interface gigabitethernet 1/0/2
[DeviceB-GigabitEthernet1/0/2] smart-link flush enable
4) Configuration on Device D
# Create monitor link group 1.
<DeviceD> system-view
[DeviceD] monitor-link group 1
# Configure GigabitEthernet 1/0/1 as the uplink port and GigabitEthernet 1/0/2 as the downlink port for
monitor link group 1.
[DeviceD-mtlk-group1] port gigabitethernet 1/0/1 uplink
[DeviceD-mtlk-group1] port gigabitethernet 1/0/2 downlink
[DeviceD-mtlk-group1] quit
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