D-Link DGS-6600-48TS Configuration Guide - Page 99
VLAN Tunneling, Overview, An Introduction to VLAN Tunneling
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Volume 3-Layer 2 Configurations / Chapter 11-VLAN Tunneling Chapter Overview Chapter 11 VLAN Tunneling Chapter Overview The following topics are included in this chapter, please go to the topic for more detailed information: • Chapter Overview • An Introduction to VLAN Tunneling • VLAN Tunneling Configuration Commands • Enabling VLAN Tunneling • Specifying UNI/NNI Ports • Configuring NNI Port S-Tag TPID • Removing the Inner Tag of an Incoming Packet • Creating VLAN Encapsulation Rules • Creating VLAN Remarking Rules • Creating CoS Remarking Rules • Configuring Ingress Checking • Verifying the VLAN Tunneling Configuration • Configuration Examples • QinQ Configuration Example • List of Constants and Default Settings An Introduction to VLAN Tunneling This chapter describes how to configure IEEE 802.1Q VLAN Tunneling. VLAN tag uses 12 bits to identify 4094 VLANs, which is insufficient for identifying a large mass of users. To solve this problem, the VLAN tunnel feature was developed, which maps VLAN tags within a second layer of tags. The implementation of an extra VLAN tag squares the number of potential VLANs, making a total of 16 million. By using this feature, service providers can use a single VLAN to support customers that have multiple VLANs, therefore allowing traffic from different customer VLANs to be segregated. Below are a list of introductory topics, regarding VLAN on the DGS-6600 Series Switch: • VLAN Encapsulation • VLAN Remarking • CoS Remarking • Packet Forwarding Flow • Tunnel Table • VLAN Tunnel TPID • VLAN Tunnel Ingress Check • UNI to NNI or UNI to UNI Forwarding • Determining the S-VLAN • Determining the Forwarding Port DGS-6600 Configuration Guide 99
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