CHAPTER
13-1
Catalyst 3750 MetroSwitch Software Configuration Guide
78-15870-01
13
Configuring IEEE 802.1Q and Layer 2
Protocol Tunneling
Virtual private networks (VPNs) provide enterprise-scale connectivity on a shared infrastructure, often
Ethernet-based, with the same security, prioritization, reliability, and manageability requirements of
private networks. Tunneling is a feature designed for service providers who carry traffic of multiple
customers across their networks and are required to maintain the VLAN and Layer 2 protocol
configurations of each customer without impacting the traffic of other customers. The
Catalyst 3750 Metro switch supports 802.1Q tunneling and Layer 2 protocol tunneling, as well as VLAN
mapping (VLAN-ID translation).
Note For complete syntax and usage information for the commands used in this chapter, refer to the command
reference for this release.
This chapter contains these sections:
• Understanding 802.1Q Tunneling, page 13-2
• Configuring 802.1Q Tunneling, page 13-4
• Configuring VLAN Mapping, page 13-7
• Understanding Layer 2 Protocol Tunneling, page 13-10
• Configuring Layer 2 Protocol Tunneling, page 13-12
• Monitoring and Maintaining Tunneling and Mapping Status, page 13-16
Note For information about VPNs used with multiprotocol label switching (MPLS), see Chapter 30,
“Configuring MPLS and EoMPLS.”
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