Cisco CRS Configuration Guide

CHAPTER 5 Implementing MPLS Forwarding 155
Prerequisites for Implementing Cisco MPLS Forwarding 156
Restrictions for Implementing Cisco MPLS Forwarding 156
Information About Implementing MPLS Forwarding 156
MPLS Forwarding Overview 156
Label Switching Functions 157
Distribution of Label Bindings 157
MFI Control-Plane Services 158
MFI Data-Plane Services 158
Time-to-Live Propagation in Hierarchical MPLS 158
MPLS Maximum Transmission Unit 158
How to Implement MPLS Forwarding 158
Configuring the Time-to-Live Propagation in Hierarchical MPLS 159
Configuring the Size of the Local Label 160
Additional References 161
CHAPTER 6 Implementing MPLS Traffic Engineering 163
Prerequisites for Implementing Cisco MPLS Traffic Engineering 165
Information About Implementing MPLS Traffic Engineering 166
Overview of MPLS Traffic Engineering 166
Benefits of MPLS Traffic Engineering 166
How MPLS-TE Works 166
MPLS Traffic Engineering 168
Backup AutoTunnels 168
AutoTunnel Attribute-set 168
Link Protection 169
Node Protection 169
Backup AutoTunnel Assignment 170
Explicit Paths 171
Periodic Backup Promotion 171
Protocol-Based CLI 171
Differentiated Services Traffic Engineering 172
Prestandard DS-TE Mode 172
IETF DS-TE Mode 172
Cisco IOS XR MPLS Configuration Guide for the Cisco CRS Router, Release 5.1.x
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Contents

Cisco CRS Specifications

General

Operating System	Cisco IOS XR
Product Type	Core Router
Form Factor	Modular Chassis
Dimensions	Varies by chassis type
Weight	Varies by chassis type
Architecture	Distributed
Switch Fabric	Multi-stage
Interface Support	Ethernet, SONET/SDH, OTN
Interfaces/Ports	Varies by line card
Port Density	Varies by line card
Routing Protocol	BGP, IS-IS, OSPF, MPLS
Management	CLI, SNMP
Power Supply	Redundant, hot-swappable
Cooling	Redundant, Hot-swappable Fan Trays
Supported Protocols	IPv4, IPv6, MPLS
Management Interfaces	Ethernet, console
Security Features	ACLs