3com S7906E Manuel De Montage

 

2-5 

z 

Switch B in this diagram is a distributed device. 

z 

Switch B has Layer 2 and Layer 3 port isolation configured in this configuration example, so you 

need to configure local proxy ARP on VLAN-interface 2 of Switch A to enable communication 

between Host A and Host B. If the two ports on Switch B are isolated only at Layer 2, you can 

enable communication between the two hosts by configuring local proxy ARP on VLAN-interface 2 

of Switch B. 

 

1)  Configure Switch B 

# Add GigabitEthernet2/0/3, GigabitEthernet2/0/1 and GigabitEthernet2/0/2 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 2/0/1 

[SwitchB-vlan2] port gigabitethernet 2/0/2 

[SwitchB-vlan2] port gigabitethernet 2/0/3 

[SwitchB-vlan2] quit 

[SwitchB] interface gigabitethernet 2/0/1 

[SwitchB-gigabitethernet2/0/1] port-isolate enable 

[SwitchB-gigabitethernet2/0/1] interface gigabitethernet 2/0/3 

[SwitchB-gigabitethernet2/0/3] port-isolate enable 

[SwitchB-gigabitethernet2/0/3] quit  

2)  Configure Switch A 

# Create VLAN 2, and add gigabitethernet2/0/2 to VLAN 2.  

<SwitchA> system-view 

[SwitchA] vlan 2 

[SwitchA-vlan2] port gigabitethernet 2/0/2 

[SwitchA-vlan2] interface vlan-interface 2 

[SwitchA-Vlan-interface2] 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 and 

Layer 3. 

# Configure local proxy ARP to let Host A and Host B communicate at Layer 3. 

[SwitchA-Vlan-interface2] local-proxy-arp enable 

The ping operation from Host A to Host B is successful after the configuration. 

As shown in 

, a super VLAN, VLAN 10, is created, with the interface IP address being 

192.168.10.100/16. Sub-VLANs (VLAN 2 and VLAN 3) are created. gigabitethernet2/0/2 belongs to 

VLAN 2 and gigabitethernet2/0/1 belongs to VLAN 3.