Chapter 2
MPLS Overview
This chapter describes Multiprotocol Label Switching (MPLS) and contains the following
sections:
■ MPLS Overview on page 202
■ Conventions for MPLS Topics on page 202
■ MPLS Terms and Acronyms on page 203
■ MPLS Features on page 206
■ MPLS Platform Considerations on page 207
■ MPLS References on page 207
■ MPLS Label Switching and Packet Forwarding on page 209
■ MPLS Label Distribution Methodology on page 218
■ Mapping IP Data Packets onto MPLS LSPs on page 220
■ Statistics for IP Packets Moving On or Off MPLS LSPs on page 222
■ MPLS Forwarding and Next-Hop Tables on page 224
■ Spoof Checking MPLS Packets on page 225
■ IP and IPv6 Tunnel Routing Tables and MPLS Tunnels on page 225
■ Explicit Routing for MPLS on page 226
■ MPLS Interfaces and Interface Stacking on page 227
■ MPLS Label Distribution Protocols on page 229
■ ECMP Labels for MPLS on page 233
■ MPLS Connectivity Verification and Troubleshooting Methods on page 235
■ Point-to-Multipoint LSPs Connectivity Verification at Egress Nodes
Overview on page 237
■ Ping Extensions for Point-to-Multipoint LSPs Connectivity Verification at Egress
Nodes on page 237
■ TLVs and Sub-TLVs Supported for Point-to-Multipoint LSPs Connectivity
Verification at Egress Nodes on page 239
■ LDP Discovery Mechanisms on page 242
■ MPLS Traffic Engineering on page 243
■ Topology-Driven LSPs on page 246
■ LDP Graceful Restart on page 247
■ 201
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