ZyXEL GS1920 Series User Guide - Page 229
Table 103, Label, Description
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Chapter 27 Layer 2 Protocol Tunneling Figure 168 Advanced Application > Layer 2 Protocol Tunneling The following table describes the labels in this screen. Table 103 Advanced Application > Layer 2 Protocol Tunneling LABEL DESCRIPTION Active Select this to enable layer 2 protocol tunneling on the Switch. Destination MAC Address 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. Note: The MAC address can be either a unicast MAC address or multicast MAC address. If you use a unicast MAC address, make sure the MAC address does not exist in the address table of a switch on the service provider's network. Note: All the edge switches in the service provider's network should be set to use the same MAC address for encapsulation. Port This field displays the port number. * Use this row to make the setting the same for all ports. Use this row first and then make adjustments on a port-by-port basis. CDP STP Note: Changes in this row are copied to all the ports as soon as you make them. Select this option to have the Switch tunnel CDP (Cisco Discovery Protocol) packets so that other Cisco devices can be discovered through the service provider's network. Select this option to have the Switch tunnel STP (Spanning Tree Protocol) packets so that STP can run properly across the service provider's network and spanning trees can be set up based on bridge information from all (local and remote) networks. GS1920 Series User's Guide 229