3Com 4210G Series Configuration Manual page 226

[SwitchB-vlan2] port gigabitethernet 1/0/2
[SwitchB-vlan2] quit
[SwitchB] vlan 3
[SwitchB-vlan3] port gigabitethernet 1/0/3
[SwitchB-vlan3] quit
[SwitchB] vlan 5
[SwitchB-vlan5] port gigabitethernet 1/0/1
[SwitchB-vlan5] isolate-user-vlan enable
[SwitchB-vlan5] quit
[SwitchB] isolate-user-vlan 5 secondary 2 3
2) Configure Switch A
# Create VLAN 5 and add GigabitEthernet 1/0/1 to it.
<SwitchA> system-view
[SwitchA] vlan 5
[SwitchA-vlan5] port gigabitethernet 1/0/1
[SwitchA-vlan5] interface vlan-interface 5
[SwitchA-Vlan-interface5] ip address 192.168.10.100 255.255.0.0
The ping operation from Host A to Host B is unsuccessful because they are isolated at Layer 2.
# Configure local proxy ARP to implement communication between VLAN 2 and VLAN 3.
[SwitchA-Vlan-interface5] local-proxy-arp enable
[SwitchA-Vlan-interface5] quit
The ping operation from Host A to Host B is successful after the configuration.
3-6