MES3500 Series User’s Guide
242
C
H A P T E R
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Layer 2 Protocol Tunneling
This chapter shows you how to configure layer-2 protocol tunneling on the Switch.
30.1 Layer 2 Protocol Tunneling Overview
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 144
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).
1
2
A
C
Service Provider's
Network
STP
CDP
B
VTP
STP
VTP
CDP
Содержание MES3500 Series
Страница 16: ...Table of Contents MES3500 Series User s Guide 16 Appendix C Legal Information 357 Index 362...
Страница 17: ...17 PART I User s Guide...
Страница 72: ...72 PART II Technical Reference...
Страница 106: ...Chapter 9 VLAN MES3500 Series User s Guide 106 Figure 49 Advanced Application VLAN Port Based VLAN Setup Port Isolation...
Страница 178: ...Chapter 22 Policy Rule MES3500 Series User s Guide 178 Figure 98 Policy Example EXAMPLE...
Страница 360: ...Appendix C Legal Information MES3500 Series User s Guide 360 Environmental Product Declaration...
