Chapter 29 Layer 2 Protocol Tunneling

 

 

 

 

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

 

LABEL

DESCRIPTION

 

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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ES3500 Series User’s Guide