Chapter 30 Configuring Mpls And Eompls; Understanding Mpls Services - Cisco Catalyst 3750 Software Configuration Manual

Metro switch

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Configuring MPLS and EoMPLS

This chapter describes how to configure multiprotocol label switching (MPLS) and Ethernet over MPLS

(EoMPLS) on the Catalyst 3750 Metro switch. MPLS is a packet-switching technology that integrates

link layer (Layer 2) switching with network layer (Layer 3) routing. With MPLS, data is transferred over

any combination of Layer 2 technologies, using any Layer 3 protocol, with increased scalability. MPLS

supports different routes between a source and destination over a router-based Internet backbone.

EoMPLS is tunneling mechanism that transports Layer 2 Ethernet frames over an MPLS network. You

can connect two Layer 2 networks that are in different locations, without requiring bridges, routers, or

switches at the locations. You enable the MPLS backbone to accept Layer 2 traffic by configuring the

label-edge routers (LERs) at both ends of the MPLS backbone.

MPLS functionality is supported only on the enhanced-services (ES) ports; EoMPLS is supported on

standard and ES ports.

For more information about MPLS, refer to the Cisco IOS Switching Services Configuration Guide for

Release 12.l. For complete syntax and usage information for the MPLS commands used in this chapter,

refer to the Cisco IOS Switching Services Command Reference for Release 12.l.

For more information about EoMPLS commands, refer also to the command reference for this release.

This chapter contains these sections:

In conventional Layer 3 forwarding, as a packet travels across the network, each router extracts the

packet-forwarding information from the Layer 3 header and uses this information as an index for a

routing table lookup to determine the packet's next hop. In most cases, the only relevant field in the

header is the destination address field, but in some cases other header fields are also relevant. For this

reason, each router through which the packet passes must analyze the packet header.

Understanding MPLS Services, page 30-1

Understanding MPLS VPNs, page 30-2

Configuring MPLS VPNs, page 30-6

Understanding EoMPLS, page 30-12

Enabling EoMPLS, page 30-15

Configuring MPLS and EoMPLS QoS, page 30-18

Monitoring and Maintaining MPLS and EoMPLS, page 30-22

C H A P T E R

Catalyst 3750 Metro Switch Software Configuration Guide

Troubleshooting