ZyXEL GS2200-8 User Guide - Page 219
Layer 2 Protocol Tunneling
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CHAPTER 27 Layer 2 Protocol Tunneling 27.1 Overview This chapter shows you how to configure layer 2 protocol tunneling on the Switch. 27.1.1 What You Can Do Use the Layer 2 Protocol Tunnel screen (Section 27.2 on page 221) to enable layer 2 protocol tunneling on the Switch and specify a MAC address with which the Switch uses to encapsulate the layer 2 protocol packets by replacing the destination MAC address in the packets. 27.1.2 What You Need to Know Layer 2 protocol tunneling (L2PT) is used on the service provider's edge devices. L2PT allows edge switches (1 and 2 in the following figure) to tunnel layer 2 STP (Spanning Tree Protocol), CDP (Cisco Discovery Protocol) and VTP (VLAN Trunking Protocol) packets between customer switches (A, B and C in the following figure) connected through the service provider's network. The edge switch encapsulates layer 2 protocol packets with a specific MAC address before sending them across the service provider's network to other edge switches. Figure 139 Layer 2 Protocol Tunneling Network Scenario A Service Provider's C STP Network CDP 1 STP 2 CDP VTP VTP B In the following example, if you enable L2PT for STP, you can have switches A, B, C and D in the same spanning tree, even though switch A is not directly connected to switches B, C and D. Topology change information can be propagated throughout the service provider's network. GS2200-8/24 User's Guide 219