Planet XGS3-24042 User Manual download pdf (Page 187)

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Chapter 21 Flexible QinQ Configuration

21.1 Introduction to Flexible QinQ

21.1.1 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.

21.1.2 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.

21.1.3 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.

21.2 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

2. Create flexible QinQ policy-map to relate with the class-map and set the corresponding operation

3. Bind flexible QinQ policy-map to port

1. Configure class map

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