Flexible QinQ Configuration
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22. Flexible QinQ Configuration
22.1
Introduction to Flexible QinQ
22.1.1
QinQ Technique
Dot1q-tunnel is also called QinQ (802.1Q-in-802.1Q), which is an expansion of
802.1Q. Its dominating idea is encapsulating the customer VLAN tag (CVLAN tag) to the
service provider VLAN tag (SPVLAN tag). The packet with two VLAN tags is transmitted
through the backbone network of the ISP internet to provide a simple layer-2 tunnel for the
users. It is simple and easy to manage, applicable only by static configuration, and
especially adaptive to small office network or small metropolitan area network using
layer-3 switch as backbone equipment.
There are two kinds of QinQ: basic QinQ and flexible QinQ, the priority of flexible
QinQ is higher than basic QinQ.
22.1.2
Basic QinQ
Basic QinQ based the port. After a port configures QinQ, whether the received packet
with tag or not, the device still packs the default VLAN tag for the packet. Using basic
QinQ is simple, but the setting method of VLAN tag is inflexible.
22.1.3
Flexible QinQ
Flexible QinQ based data flow. It selects whether pack the external tag and packs
what kind of the external tag by matching the material flow. For example: implement the
property of flexible QinQ according to the user‘s VLAN tag, MAC address, IPv4/IPv6
address, IPv4/IPv6 protocol and the port ID of the application, etc. So, it can encapsulate
the external tag for the packet and implements different scheme by different users or
methods.
22.2
Flexible QinQ Configuration Task List
The match of flexible QinQ data flow uses policy-map rule of QoS to be sent, the
configuration task list is as follows:
1. Create class-map to classify different data flows