ZyXEL Communications metrogigabit switch manual 306, UDLD, and Pagp on the access ports only

Chapter 29 Layer 2 Protocol Tunneling

Table 96 Advanced Application > Layer 2 Protocol Tunneling (continued)

LABEL	DESCRIPTION
*	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.

	Note: Changes in this row are copied to all the ports as soon as you
	make them.
CDP	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.
STP	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.
VTP	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.
Point to Point	The Switch supports PAgP (Port Aggregation Protocol), LACP (Link
	Aggregation Control Protocol) and UDLD (UniDirectional Link Detection)
	tunneling for a point-to-point topology.
	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.
PAGP	Select this option to have the Switch send PAgP packets to a peer to
	automatically negotiate and build a logical port aggregation.
LACP	Select this option to have the Switch send LACP packets to a peer to
	dynamically creates and manages trunk groups.
UDLD	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.
Mode	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.
	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.
Apply	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.
Cancel	Click Cancel to begin configuring this screen afresh.

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MGS3700-12C User’s Guide