To make the packets from the servers be transmitted to the clients in the same way, you need to configure the selective QinQ feature on GigabitEthernet 1/0/12 and GigabitEthernet 1/0/13. The configuration on Switch B is similar to that on Switch A and is thus omitted.

zThe port configuration on Switch B is only an example for a specific network requirement. The key to this example is to enable the ports to receive and forward packets of specific VLANs. So you can also configure the ports as access or trunk ports. Refer to Port Basic Configuration for details.

zA selective QinQ-enabled device tags a user packet with an outer VLAN tag regardless of the VLAN tag of the user packet, so there is no need to configure user VLANs on the device.

zMake sure the packets of the default VLAN of a selective QinQ-enabled port are permitted on both the local port and the port connecting to the public network.

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3Com WX3000 operation manual