Configuring IP/LDP Fast Reroute 318
Configuring IS-IS Overload Bit Avoidance 320
ISIS Link Group 321
Configure Link Group Profile 322
Configure Link Group Interface 324
Configuration Examples for Implementing IS-IS 325
Configuring Single-Topology IS-IS for IPv6: Example 325
Configuring Multitopology IS-IS for IPv6: Example 326
Redistributing IS-IS Routes Between Multiple Instances: Example 326
Tagging Routes: Example 327
Configuring IS-IS Overload Bit Avoidance: Example 327
Where to Go Next 327
Additional References 328
CHAPTER 6
Implementing OSPF 331
Prerequisites for Implementing OSPF 332
Information About Implementing OSPF 333
OSPF Functional Overview 333
Key Features Supported in the Cisco IOS XR Software OSPF Implementation 334
Comparison of Cisco IOS XR Software OSPFv3 and OSPFv2 335
OSPF Hierarchical CLI and CLI Inheritance 335
OSPF Routing Components 336
Autonomous Systems 336
Areas 336
Backbone Area 337
Stub Area 337
Not-so-Stubby Area 337
Routers 337
Area Border Routers 337
Autonomous System Boundary Routers (ASBR) 338
Interior Routers 338
OSPF Process and Router ID 338
Supported OSPF Network Types 339
Route Authentication Methods for OSPF 339
Plain Text Authentication 339
Cisco ASR 9000 Series Aggregation Services Router Routing Configuration Guide, Release 5.1.x
OL-30423-03 xv
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