3Com 4500G Family Configuration Manual page 190

Make configuration to achieve the following:
Frames of VLAN 200 through VLAN 299 can be exchanged between Customer A1and Customer
A2 through VLAN 10 of the service provider network.
Frames of VLAN 250 through VLAN 350 can be exchanged between Customer B1 and Customer
B2 through VLAN 50 of the service provider network.
Figure 1-4 Network diagram for VLAN transparent transmission configuration
Configuration procedure
Make sure that the devices in the service provider network have been configured to allow QinQ packets
to pass through.
1) Configuration on Provider A
Configure GigabitEthernet 1/0/1
# Configure VLAN 10 as the default VLAN of GigabitEthernet 1/0/1.
<ProviderA> system-view
[ProviderA] interface gigabitethernet 1/0/1
[ProviderA-GigabitEthernet1/0/1] port access vlan 10
# Enable basic QinQ on GigabitEthernet 1/0/1.
[ProviderA-GigabitEthernet1/0/1] qinq enable
[ProviderA-GigabitEthernet1/0/1] quit
Configure GigabitEthernet 1/0/2
# Configure GigabitEthernet 1/0/2 as a hybrid port and configure VLAN 50 as the default VLAN of the
port.
[ProviderA] interface gigabitethernet 1/0/2
[ProviderA-GigabitEthernet1/0/2] port link-type hybrid
[ProviderA-GigabitEthernet1/0/2] port hybrid pvid vlan 50
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