Layer 2 Vpn Application - Cisco Catalyst 3750 Software Configuration Manual

Metro switch

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Network Configuration Examples

Layer 2 VPN Application

You can use Catalyst 3750 Metro switches to form Layer 2 VPNs so that customers at different locations

can exchange information through a service-provider network, without requiring dedicated connections.

IEEE 802.1Q and Layer 2 protocol tunneling are features 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 switches are used as the provider edge (PE) switches at the both edges of the

provider network connected to customer premises equipment (CPE) switches. The PE switches tag

packets entering the service-provider network with the customer VLAN ID. VLAN mapping translates

each customer VLAN ID to a service-provider VLAN ID for transport across the service-provider

network. At the egress PE interface, the egress PE switch restores the original VLAN ID numbers for

the customer's network.

The service provider can use 802.1Q tunneling or EoMPLS to provide Layer 2 VPN services. If the

service-provider network is an MPLS cloud, and EoMPLS is configured as the point-to-point protocol,

MPLS tags are added at the ingress PE ES port that connects to the MPLS network. The MPLS tags are

removed at the ES port of the remote PE device.

"Configuring MPLS and EoMPLS,"

Corp A, site 1

Corp B, site 1

Catalyst 3750 Metro Switch Software Configuration Guide

Chapter 13, "Configuring IEEE 802.1Q and Layer 2 Protocol Tunneling,"

Layer 2 VPN Configuration

Catalyst 3750

Metro switch

Catalyst 3750

Metro switch

for more information on configuring these features.

SP Metro core

Corp B, site 2

Corp A, site 2

Corp B, site 3