Chapter 1 Qinq Configuration; Qinq Overview; Introduction To Qinq - H3C S9500 Series Operating Manual

Operation Manual – QinQ
H3C S9500 Series Routing Switches

Chapter 1 QinQ Configuration

When configuring QinQ, go to these sections for the information you are interested in:

QinQ Overview

Configuring VLAN VPN on a Port
Configuring Traffic Classification-Based Nested VLAN
Configuring the TPID to Be Used in the Outer Tag
Configuring VLAN-VPN Tunneling
Displaying and Maintaining QinQ Configuration
1.1 QinQ Overview

1.1.1 Introduction to QinQ

QinQ is a technique that enables packets to be transmitted across the operators'
backbone networks with VLAN tags of private networks nested in those of public
networks. In public networks, packets of this type are transmitted by their outer VLAN
tags (that is, the VLAN tags of public networks). And those of private networks, which
are nested in the VLAN tags of public networks, remain intact.
Figure 1-1
Figure 1-1 Single-tagged frame structure vs. double-tagged Ethernet frame structure
Compared with MPLS-based L2VPN, QinQ has the following features:
Layer 2 VPN tunnels that are simpler.
QinQ can be implemented without the support of signaling protocols. You can
enable QinQ by static configuring.
As QinQ is implemented through trunk port defined in 802.1Q, all devices along tunnels
with QinQ employed must be 802.1Q-enabled. Therefore, QinQ is suitable for
shows the structure of a single-tagged frame and a double-tagged frame.
1-1
Chapter 1 QinQ Configuration