3Com Switch 7750 Configuration Guide

168 CHAPTER 20: SELECTIVE QINQ CONFIGURATION

# Configure the port to permit the packets of all the VLANs.

[SwitchA-GigabitEthernet2/0/1] port hybrid vlan 1 to 4094 untagged

# Set the PVID of the port to 8.

[SwitchA-GigabitEthernet2/0/1] port hybrid pvid vlan 8

# Enable QinQ.

[SwitchA-GigabitEthernet2/0/1] vlan-vpn enable

# Specify the outer VLAN tag to be inserted to packets of VLAN 10, and specify

the upstream port of the tag to be GigabitEthernet2/0/1 which does not remove

the outer VLAN tags of packets when transmitting these packets.

[SwitchA-GigabitEthernet2/0/1] vlan-vpn vid 10 uplink GigabitEthernet 2/0/1

# Specify the inner VLAN tags.

[SwitchA-GigabitEthernet2/0/1-vid-10] raw-vlan-id inbound 8 to 15

# Specify the outer VLAN tag of VLAN 100 to be inserted to packets, and specify

the upstream port of the tag to be GigabitEthernet2/0/1 which does not remove

the outer VLAN tags of packets when transmitting these packets.

[SwitchA-GigabitEthernet2/0/1-vid-10] quit

[SwitchA-GigabitEthernet2/0/1] vlan-vpn vid 100 uplink GigabitEthernet 2/0/1

# Specify the inner VLAN tags.

[SwitchA-GigabitEthernet2/0/1-vid-100] raw-vlan-id inbound 20 to 25

The above configuration causes the packets reaching GigabitEthernet2/0/1 port

being processed as follows

■ Inserting VLAN 10 tag as the outer VLAN tag to single-tagged packets with

their tags being that of VLAN 8 through VLAN 15.

■ Inserting VLAN 100 tag as the outer VLAN tag to single-tagged packets with

their tags being that of VLAN 20 through VLAN 25.

■ Inserting VLAN 8 tag as the outer VLAN tag to single-tagged packets with their

tags being neither that of VLAN 8 through VLAN 15 nor that of VLAN 20

through VLAN 25.