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GS1920 Series User’s Guide

227

H A P T E R

2 7

Layer 2 Protocol Tunneling

27.1

Layer 2 Protocol Tunneling

Overview

This chapter shows you how to configure layer 2 protocol tunneling on the Switch.

Layer 2 protocol tunneling (L2PT) is used on the service provider's edge devices.

27.1.1

What You Can Do

Use the Layer 2 Protocol Tunnel screen (Section 27.2 on page 228) to enable layer 2 protocol
tunneling on the Switch and 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.

27.1.2

What You Need to Know

Layer 2 protocol tunneling (L2PT) is used on the service provider's edge devices.

L2PT allows edge switches

(1 and 2 in the following figure)

to tunnel layer 2 STP (Spanning Tree

Protocol), CDP (Cisco Discovery Protocol) and VTP (VLAN Trunking Protocol) packets between
customer switches

(A, B and C in the following figure)

connected through the service provider’s

network. The edge switch encapsulates layer 2 protocol packets with a specific MAC address before
sending them across the service provider’s network to other edge switches.

Figure 166

Layer 2 Protocol Tunneling Network Scenario

In the following example, if you enable L2PT for STP, you can have switches A, B, C and D in the
same spanning tree, even though switch A is not directly connected to switches B, C and D.
Topology change information can be propagated throughout the service provider’s network.

To emulate a point-to-point topology between two customer switches at different sites,

such as A

and B,

you can enable protocol tunneling on edge switches

1 and 2

for PAgP (Port Aggregation

Protocol), LACP or UDLD (UniDirectional Link Detection).

Service Provider's

Network

STP

CDP

VTP