Cisco CRS Configuration Guide

Bandwidth Constraint Models 173
Maximum Allocation Bandwidth Constraint Model 173
Russian Doll Bandwidth Constraint Model 173
TE Class Mapping 174
Flooding 174
Flooding Triggers 174
Flooding Thresholds 175
Fast Reroute 175
IS-IS IP Fast Reroute Loop-free Alternative 176
MPLS-TE and Fast Reroute over Link Bundles 176
Ignore Intermediate System-to-Intermediate System Overload Bit Setting in MPLS-TE 177
DWDM Transponder Integration 178
GMPLS Benefits 178
GMPLS Support 178
GMPLS Protection and Restoration 179
1:1 LSP Protection 179
Shared Mesh Restoration and M:N Path Protection 179
End-to-end Recovery 180
GMPLS Protection Requirements 180
GMPLS Prerequisites 180
Flexible Name-based Tunnel Constraints 180
MPLS Traffic Engineering Interarea Tunneling 181
Interarea Support 181
Multiarea Support 181
Loose Hop Expansion 182
Loose Hop Reoptimization 183
ABR Node Protection 183
Fast Reroute Node Protection 183
MPLS-TE Forwarding Adjacency 183
MPLS-TE Forwarding Adjacency Benefits 183
MPLS-TE Forwarding Adjacency Restrictions 184
MPLS-TE Forwarding Adjacency Prerequisites 184
Unequal Load Balancing 184
Path Computation Element 185
Policy-Based Tunnel Selection 186
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