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XG2000 series User's Guide
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All Rights Reserved, Copyright (C) PFU LIMITED 2009
4.7.3 Multiple VLAN
With the user-defined VLAN tag protocol identifier, the IEEE 802.1Q standard tag can be replaced with a user-defined VPID,
allowing for encapsulation of multiple tags for multiple-tagged VLANs. The standard tag identifier or TPID is 0x8100 as defined
in IEEE 802.1Q.
For the frame format, refer to TPID (Tag Protocol Identifier) in "Tag VLAN Frame Format
".
Using multiple VLAN (also known as double tagging or Q-in-Q) allows a service provider to transparently forward customers'
VLAN traffic even if the service provider assigns customer traffic to different VLANs.
To configure multiple VLAN using a user-defined VLAN tag protocol identifier, carry out the following procedures in the
administrator EXEC mode.
Command Task
xg# configure terminal
Switch to global configuration mode.
xg(config)# vlan <1-4094> [ description
VLAN_DESCRIPTION ]
Create a VLAN to use.
xg(config)# vlan-statistics collection <1-4094>
[ <1-4094> ]
(Optional)
Configure a VLAN that collects statistics.
xg(config)# interface port 1
Switch to interface edit mode to designate a port for
multiple VLAN configuration.
In this example, the global interface configuration mode
is selected for port 1.
xg(config-if)# user-vlan-protocol-id <0x05DD ~
0xFFFF>
Set the user-defined VLAN tag protocol identifier.
xg(config-if)# vlan-member allowed vlan
{ <1-4094> | all }
{ egress-untagging | egress-tagging }
Register the port to the VLAN.
Specify "egress-tagging" for tagged output at the port.
Specify "egress-untagging" for the port untagged output
at the port.
xg(config-if)# ingress-filter tagged-frame
xg(config-if)# ingress-filter untagged-frame
(Optional)
Define a filter for frames received (tagged and
untagged) for the port, if necessary.
xg(config-if)# exit
Exit to global configuration mode.
xg(config)# exit
Exit to administrator EXEC mode.
xg# show interface
xg# show vlan
Verify the port state and VLAN membership state for
each port.