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Ambiguous VLAN implementation for IP sessions in Intelligent Services Gateway (ISG) has the following benefits:

• The service provider only needs to know the end-user VLAN ranges instead of the individual end-user VLAN IDs.

• The ambiguous VLAN feature allows the configuration of multiple VLANs under one subinterface which leads to better Interface Descriptor Block (IDB) utilization.

You can define a range of inner VLANS and create QinQ VLANS, or you can use the keyword any for the system to assign any inner VLAN ID that has not been used elsewhere.

To configure a range of inner VLANS:

configure terminal
interface GigabitEthernet1/0.200
 encapsulation dot1q 200 second-dot1q 1000-2000,3000,3500-4000

or

configure terminal
interface GigabitEthernet1/0.200
 encapsulation dot1q 200 second-dot1q 1000-2000

To configure the sub-interface for ambiguous VLAN:

configure terminal
interface GigabitEthernet1/0.200
 encapsulation dot1q 200 second-dot1q any

Use show subscriber session command to verify the configuration of Ambiguous VLAN Support for IP Sessions over ISG feature.

Device# show subscriber session uid 6

Type: IP, UID: 6, State: unauthen, Identity: 12.12.12.2
IPv4 Address: 12.12.12.2 
Session Up-time: 00:00:34, Last Changed: 00:00:34
Switch-ID: 8221

Policy information:
  Authentication status: unauthen

Classifiers:
Class-id    Dir   Packets    Bytes                  Pri.  Definition
0           In    4          488                    0    Match Any
1           Out   4          488                    0    Match Any

Configuration Sources:
Type  Active Time  AAA Service ID  Name
INT   00:00:34     -               GigabitEthernet0/1/3.1