Layer 2 Protocol Tunneling; L A Ye R 2 Pro To C O L T Unne Ling; Layer 2 Protocol Tunneling Overview; What You Can Do - ZyXEL Communications GS1920v2 Series User Manual

L a ye r 2 Pro to c o l T unne ling

28.1 L a ye r 2 Pro to c o l T unne ling O ve rvie w
This chapter shows you how to configure layer 2 protocol tunneling on the Switch.
28.1.1 Wha t Yo u C a n Do
Use the
L a ye r 2 Pro to c o l T unne l
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.
28.1.2 Wha t Yo u Ne e d to Kno w
Layer 2 protocol tunneling (L2PT) is used on the service provider's edge devices.
L2PT allows edge switches (
CDP (Cisco Discovery Protocol) and VTP (VLAN Trunking Protocol) packets between customer switches
( , and
A B C
encapsulates layer 2 protocol packets with a specific MAC address before sending them across the
service provider's network to other edge switches.
Fig ure 189
In the following example, if you enable L2PT for STP, you can have switches
spanning tree, even though switch
information can be propagated throughout the service provider's network.
Chapter 28 Layer 2 Protocol Tunneling
screen
and in the following figure) to tunnel layer 2 STP (Spanning Tree Protocol),
1 2
in the following figure) connected through the service provider's network. The edge switch
Layer 2 Protocol Tunneling Network Scenario
A
GS1920v2 Series User's Guide
C
(Section 28.2 on page
is not directly connected to switches
262
HA PTER
263) to enable layer 2 protocol tunneling
, , and
A B C
, and . Topology change
B C D
2 8
in the same
D