3Com Switch 7750 Series
Command Reference Guide — Q-in-Q Commands Chapter 1 Q-in-Q Configuration Commands
1-2
Description
Use the vlan-vpn enable command to enable the Q-in-Q function for a port.
Use the undo vlan-vpn command to disable the Q-in-Q function for a port.
By default, the Q-in-Q function is disabled.
With the Q-in-Q function enabled, a received packet is tagged with the default VLAN
tag of the receiving port no matter whether or not the packet already carries a VLAN tag.
If the packet already carries a VLAN tag, the packet becomes a dual-tagged packet.
Otherwise, the packet becomes a packet carrying the default VLAN tag of the port.
Caution:
z The Q-in-Q function is unavailable if voice VLAN is enabled on the port.
z After you enable the Q-in-Q function for a port, voice VLAN is not available on the
port.
Example
# Enable the Q-in-Q function for Ethernet1/0/1 port.
<3Com> system-view
System View: return to User View with Ctrl+Z.
[3Com] interface Ethernet 1/0/1
[3Com-Ethernet1/0/1] vlan-vpn enable
1.1.3 vlan-vpn priority Syntax
vlan-vpn priority inner-priority remark outer-priority
undo vlan-vpn priority inner-priority
View
Ethernet port view
Parameter
inner-priority: Inner tag priority, ranging from 0 to 7.
outer-priority: Outer tag priority, ranging from 0 to 7.
Description
Use the vlan-vpn priority command to configure an inner-outer tag priority mapping.