Figure 3-1 Specific Qinq Networking Application - Zte ZXR10 5900E Product Description

ZXR10 5900E Product Description
QinQ does not need protocol support, via which simple L2VPN (L2 Virtual Private
Network) can be implemented. It is suitable for L3 switch in small LAN
Specific networking application based upon QinQ technology is as shown in the following
figure. The port connecting to user network is called Customer port, and the one
connecting operator network is named Uplink port. Operator network edge access
equipment is called PE (Provider Edge)

Figure 3-1 Specific QinQ Networking Application

Normally user network uses Trunk VLAN to access PE. The Uplink port in service
provider network interconnects with each other via Trunk VLAN mode.
When messages reaches customer port of switch A from user network 1, the switch A will
insert an outer label (VLAN ID is 10) no matter the message is tagged or untagged.
Messages is sent long the port with VLAN 10 in service provider network to switch B.
when switch B realizes user network 2 is connecting with customer port, it will detag the
outer label according to traditional 802.1Q protocol to resume user's original messages.
Then the messages will be sent to user network 2.
In this way, streams between user network 1 and 2 can be transferred transparently via
service provider's network. User network can freely plan its private network VLAN ID
without causing VLAN ID conflicts in service provider network.
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