3Com Switch 4800G 24-Port Configuration Manual page 789

Local Proxy ARP
Configuration Example
in Case of Port Isolation
Network requirements
Host A and Host B belong to the same VLAN, and are connected to
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GigabitEthernet 1/0/2 and GigabitEthernet 1/0/3 of Switch B respectively.
Switch B is connected to Switch A via GigabitEthernet 1/0/1.
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GigabitEthernet 1/0/2 and GigabitEthernet 1/0/3 isolated at Layer 2 can
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implement Layer 3 communication.
Network diagram
Figure 238 Network diagram for local proxy ARP between isolated ports
GE1 /0/2
VLAN 2
Vlan -int2
192 .168 .10.100/16
GE 1/0 /2
Host A
192.168.10.99/16
Configuration procedure
1 Configure Switch B
# Create VLAN 2 on Switch B, on which GigabitEthernet 1/0/1, GigabitEthernet
1/0/2 and GigabitEthernet 1/0/3 belong to VLAN 2. Host A and Host B are isolated
and unable to exchange Layer 2 packets.
<SwitchB> system-view
[SwitchB] vlan 2
[SwitchB-vlan2] port gigabitethernet 1/0/1
[SwitchB-vlan2] port gigabitethernet 1/0/2
[SwitchB-vlan2] port gigabitethernet 1/0/3
[SwitchB-vlan2] quit
[SwitchB] interface gigabitethernet 1/0/2
[SwitchB-GigabitEthernet1/0/2] port-isolate enable
[SwitchB-GigabitEthernet1/0/2] quit
[SwitchB] interface gigabitethernet 1/0/3
[SwitchB-GigabitEthernet1/0/3] port-isolate enable
[SwitchB-GigabitEthernet1/0/3] quit
2 Configure Switch A
# Configure an IP address of VLAN-interface 2.
[SwitchA] vlan 2
[SwitchA-vlan2] port gigabitethernet 1/0/2
[SwitchA-vlan2] quit
[SwitchA] interface vlan-interface 2
[SwitchA-Vlan-interface2] ip address 192.168.10.100 255.255.0.0
Proxy ARP Configuration Examples
SwitchA
GE1 /0/1
GE1 /0/3
SwitchB Host B
192 .168 .10 .200 /16
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