H3c-technologies H3C WX6000 Series Access Controllers Uživatelský manuál stáhnout pdf (Strana 100)

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12 QinQ Configuration

The term switch in this document refers to a switch in a generic sense or an access controller

configured with the switching function unless otherwise specified.

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

z Introduction to QinQ

z Configuring Basic QinQ

z Configuring Selective QinQ

z Configuring the TPID Value to Be Carried in VLAN Tags

z QinQ Configuration Example

Introduction to QinQ

In the VLAN tag field defined in IEEE 802.1Q, only 12 bits are used for VLAN IDs, so a switch can

support a maximum of 4,094 VLANs. In actual applications, however, a large number of VLANs are

required to isolate users, especially in metropolitan area networks (MANs), and 4,094 VLANs are far

from satisfying such requirements.

Understanding QinQ

The port QinQ feature is a flexible, easy-to-implement Layer 2 VPN technique, which enables the

access point to encapsulate an outer VLAN tag in Ethernet frames from customer networks (private

networks), so that the Ethernet frames will travel across the service provider’s backbone network

(public network) with double VLAN tags. The inner VLAN tag is the customer network VLAN tag while

the outer one is the VLAN tag assigned by the service provider to the customer. In the public network,

frames are forwarded based on the outer VLAN tag only, with the source MAC address learned as a

MAC address table entry for the VLAN indicated by the outer tag, while the customer network VLAN tag

is transmitted as part of the data in the frames.

Figure 12-1 shows the structure of 802.1Q-tagged and double-tagged Ethernet frames. The QinQ

feature enables a device to support up to 4,094 x 4,094 VLANs to satisfy the requirement for the amount

of VLANs in the MAN.

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