Cisco Catalyst 3750 Software Configuration Manual page 716

Metro switch

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Table of Contents

Understanding MPLS VPNs

Figure 30-1 VPNs with a Service-Provider Backbone

Each VPN contains customer devices attached to the CE devices. The customer devices use VPNs to

exchange information between devices, and the provider routers (P) are not aware of the VPNs.

with these sites:

VPN1: Sites 2 and 4

VPN2: Sites 1, 3, and 4

VPN3: Sites 1, 3, and 5

Catalyst 3750 Metro Switch Software Configuration Guide

Flexible addressing—Customers can continue to use their present address spaces without network

address translation (NAT) because the MPLS VPN provides a public and private view of the address.

A NAT is required only if two VPNs with overlapping address spaces want to communicate.

Straightforward migration—You can build MPLS VPNs over multiple network architectures.

Migration for the end customer is simplified because the CE router is not required to support MPLS,

so no customer's intranet modifications are needed.

MPLS VPN also provides increased BGP functionality.

shows an example of a VPN with a service-provider backbone network, PE routers, and CE

Service provider

shows five customer sites communicating within three VPNs. The VPNs can communicate

Configuring MPLS and EoMPLS

Troubleshooting