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Chapter 27 Layer 2 Protocol Tunneling

GS2200-8/24 User’s Guide

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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.

Table 80 Advanced Application > Layer 2 Protocol Tunneling (continued)

LABEL DESCRIPTION