User's Manual

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4.6 Configuring QinQ
4.6.1 Configuring QinQ
Defined in IEEE802.1Q, VLAN Tag domain only uses 12 bytes to indicate VLAN ID,
so equipment can support up to 4094 VLANs. Some scenarios, especially in metro-
politan area network, require a separate VLAN for customers. Therefore, 4094 VLAN
cannot meet the requirement. The 802.1QinQ expands VLAN space by using a
VLAN-in-VLAN hierarchy and tagging the tagged packets. At the same time, QinQ
makes SP use one VLAN supports the entire customer's VLANs. SP provides differ-
ent service for different customers by decapsulating inner and outer vlan tag of users’
message.
Configuring QinQ by using following command:
Step 1 Create QinQ sub-interface in physical interface:
interface gigabitethernet/tengigabitethernet <slot>/<port>.<subif>
parameter description
slot Slot number，range: 1-13
port Port number
subif Sub interface，range: 1-16760836
table 4-3 Parameter Description
For example, create QinQ sub-interface gigabitethernet 1/0.1 in Ethernet interface gi-
gabitethernet 1/0:
interface gigabitethernet 1/0.1
step 2 Specify QinQ inner and outer tag
encapsulation dot1q <outer-vlan-id> second-dot1q <vlan-id|[begin-end]>
Parameter Description
out-vlan-id Single tag number，range: 1-4094
vlan-id|[begin-end] Single tag number, range: 1-4094; or range, for example: 100-200
table 4-4 Parameter Description
For example: create a QinQ interface that outer tag is 1000 and inner tag range is
100-200, and configure IP address as a layer-3 interface.
(JadeOS)(config)#interface gigabitethernet 10/0.1
(JadeOS)(config-subif)# encapsulation dot1q 1000 second-dot1q 100-200
(JadeOS)(config-subif)#ip address 1.1.1.1/32
The sub-interface can be used as a layer-3 routing sub-interface. You can configure IP
address and routing in it. 2 QinQ Tag will be peeled when receiving data, and 2 QinQ