16-21
ATM Switch Router Software Configuration Guide
OL-7396-01
Chapter16 Configuring Tag Switching and MPLS
MPLS Overview
atm_A6-4(config-if)# ip address 189.24.14.12 255.255.0.0
atm_A6-4(config-if)# tag-switching ip
atm_A6-4(config-if)# exit
The configuration of ATM switch router A6-4, interface atm0/0/3, follows:
atm_A6-4# configure terminal
atm_A6-4(config)# interface atm 0/0/3
atm_A6-4(config-if)# no shutdown
atm_A6-4(config-if)# ip address 189.26.14.11 255.255.0.0
atm_A6-4(config-if)# tag-switching ip
atm_A6-4(config-if)# exit
MPLS Overview
MPLS Label Distribution Protocol (LDP), as standardized by the I nternet Engineering Task Force
(IETF) and as enabled by Cisco IOS software, allows the construction of highly scalable and flexible IP
Virtual Private Networks (VPNs) that support multiple levels of services. MPLS offers the following
benefits:
IP over ATM scalability—Enables service providers to keep up with Internet growth
IP services over ATM—Brings Layer 2 benefits to Layer 3, such as traffic engineering capability
Standards—Supports multi-vendor solutions
Architectural flexibility—Offers choice of ATM or router technology, or a mix of both
This section describes the Multiprotocol Label Switching (MPLS) distribution protocol. MPLS
combines the performance and capabilities of Layer 2 (data link layer) switching with the proven
scalability of Layer 3 (network layer) routing. This chapter includes the following sections:
Additional MPLS Documentation
MPLS Overview
MPLS Network Packet Transmission
Configuring Label Edge Routing
Configuring VPN Networks on Fast Ethernet Interfaces

Obtaining Additional MPLS Documentation

This chapter contains early field test MPLS configuration informat ion for label edge routing (LER) and
VPN networks on Fast Ethernet interfaces. For additional MPLS configuration documentation, refer to
the sources in Table16-8.