ZyXEL GS1920 Series User Guide - Page 230
Table 103, Label, Description
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Chapter 27 Layer 2 Protocol Tunneling Table 103 Advanced Application > Layer 2 Protocol Tunneling (continued) LABEL VTP Point to Point DESCRIPTION Select this option to have the Switch tunnel VTP (VLAN Trunking Protocol) packets so that all customer switches can use consistent VLAN configuration through the service provider's network. The Switch supports PAgP (Port Aggregation Protocol), LACP (Link Aggregation Control Protocol) and UDLD (UniDirectional Link Detection) tunneling for a point-to-point topology. PAGP LACP UDLD Mode Both PAgP and UDLD are Cisco's proprietary data link layer protocols. PAgP is similar to LACP and used to set up a logical aggregation of Ethernet ports automatically. UDLD is to determine the link's physical status and detect a unidirectional link. Select this option to have the Switch send PAgP packets to a peer to automatically negotiate and build a logical port aggregation. Select this option to have the Switch send LACP packets to a peer to dynamically creates and manages trunk groups. Select this option to have the Switch send UDLD packets to a peer's port it connected to monitor the physical status of a link. Select Access to have the Switch encapsulate the incoming layer 2 protocol packets and forward them to the tunnel port(s). Select Access for ingress ports at the edge of the service provider's network. Note: You can enable L2PT services for STP, LACP, VTP, CDP, UDLD, and PAGP on the access port(s) only. Apply Cancel Select Tunnel for egress ports at the edge of the service provider's network. The Switch decapsulates the encapsulated layer 2 protocol packets received on a tunnel port by changing the destination MAC address to the original one, and then forward them to an access port. If the service(s) is not enabled on an access port, the protocol packets are dropped. Click Apply to save your changes to the Switch's run-time memory. The Switch loses these changes if it is turned off or loses power, so use the Save link on the top navigation panel to save your changes to the non-volatile memory when you are done configuring. Click Cancel to begin configuring this screen afresh. GS1920 Series User's Guide 230