Cisco ASR 9000 Series Configuration manual

Cisco ASR 9000 Series Aggregation Services Router Routing

Configuration Guide, Release 5.1.x

First Published: 2013-09-01

Last Modified: 2014-04-01

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Text Part Number: OL-30423-03

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CONTENTS

Preface

Preface xxvii

Obtaining Documentation and Submitting a Service Request xxvii

CHAPTER 1

New and Changed Routing Features 1

CHAPTER 2

Implementing BGP 7

Prerequisites for Implementing BGP 9

Information About Implementing BGP 9

BGP Functional Overview 10

BGP Router Identifier 10

BGP Default Limits 11

BGP Next Hop Tracking 12

Scoped IPv4/VPNv4 Table Walk 13

Reordered Address Family Processing 13

New Thread for Next-Hop Processing 13

show, clear, and debug Commands 13

Autonomous System Number Formats in BGP 14

2-byte Autonomous System Number Format 14

4-byte Autonomous System Number Format 14

as-format Command 14

BGP Configuration 14

Configuration Modes 15

Router Configuration Mode 15

Router Address Family Configuration Mode 15

Neighbor Configuration Mode 15

Neighbor Address Family Configuration Mode 15

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VRF Configuration Mode 15

VRF Address Family Configuration Mode 16

Configuring Resilient Per-CE Label Allocation Mode Under VRF Address

Family 16

Configuring Resilient Per-CE Label Allocation Mode Using a

Route-Policy 17

VRF Neighbor Configuration Mode 19

VRF Neighbor Address Family Configuration Mode 19

VPNv4 Address Family Configuration Mode 19

L2VPN Address Family Configuration Mode 19

Neighbor Submode 20

Configuration Templates 20

Template Inheritance Rules 22

Viewing Inherited Configurations 25

show bgp neighbors 25

show bgp af-group 26

show bgp session-group 28

show bgp neighbor-group 28

No Default Address Family 30

Neighbor Address Family Combinations 30

Routing Policy Enforcement 30

Table Policy 32

Update Groups 33

BGP Update Generation and Update Groups 33

BGP Update Group 33

BGP Cost Community 33

How BGP Cost Community Influences the Best Path Selection Process 34

Cost Community Support for Aggregate Routes and Multipaths 35

Influencing Route Preference in a Multiexit IGP Network 36

BGP Cost Community Support for EIGRP MPLS VPN PE-CE with Back-door

Links 37

Adding Routes to the Routing Information Base 38

BGP Best Path Algorithm 38

Comparing Pairs of Paths 38

Order of Comparisons 40

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Best Path Change Suppression 41

Administrative Distance 42

Multiprotocol BGP 43

Route Dampening 45

Minimizing Flapping 46

BGP Routing Domain Confederation 46

BGP Route Reflectors 46

Default Address Family for show Commands 50

MPLS VPN Carrier Supporting Carrier 50

BGP Keychains 51

BGP Nonstop Routing 51

BGP Local Label Retention 52

Command Line Interface (CLI) Consistency for BGP Commands 53

BGP Additional Paths 53

iBGP Multipath Load Sharing 53

BGP Selective Multipath 54

Accumulated Interior Gateway Protocol Attribute 56

Per VRF and Per CE Label for IPv6 Provider Edge 56

IPv4 BGP-Policy Accounting on Cisco ASR 9000's A9K-SIP-700 56

IPv6 Unicast Routing on Cisco ASR 9000's A9K-SIP-700 57

IPv6 uRPF Support on Cisco ASR 9000's A9K-SIP-700 57

Remove and Replace Private AS Numbers from AS Path in BGP 57

Selective VRF Download 58

Line Card Roles and Filters in Selective VRF Download 58

Selective VRF Download Disable 59

Calculating Routes Downloaded to Line Card with or without SVD 59

BGP Accept Own 61

BGP DMZ Link Bandwidth for Unequal Cost Recursive Load Balancing 63

BFD Multihop Support for BGP 63

BGP Multi-Instance and Multi-AS 63

BGP Prefix Origin Validation Based on RPKI 64

Configuring RPKI Cache-server 64

Configuring RPKI Prefix Validation 67

Configuring RPKI Bestpath Computation 68

BGP 3107 PIC Updates for Global Prefixes 69

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BGP Prefix Independent Convergence for RIB and FIB 70

BGP Update Message Error Handling 70

BGP Attribute Filtering 71

BGP Attribute Filter Actions 71

BGP Error Handling and Attribute Filtering Syslog Messages 71

BGP Link-State 72

BGP Permanent Network 72

BGP-RIB Feedback Mechanism for Update Generation 73

BGP VRF Dynamic Route Leaking 73

User Defined Martian Check 74

Resilient Per-CE Label Allocation Mode 74

How to Implement BGP 75

Enabling BGP Routing 75

Configuring Multiple BGP Instances for a Specific Autonomous System 77

Configuring a Routing Domain Confederation for BGP 78

Resetting an eBGP Session Immediately Upon Link Failure 79

Logging Neighbor Changes 80

Adjusting BGP Timers 80

Changing the BGP Default Local Preference Value 81

Configuring the MED Metric for BGP 82

Configuring BGP Weights 82

Tuning the BGP Best-Path Calculation 84

Indicating BGP Back-door Routes 85

Configuring Aggregate Addresses 86

Redistributing iBGP Routes into IGP 87

Redistributing Prefixes into Multiprotocol BGP 88

Configuring BGP Route Dampening 90

Applying Policy When Updating the Routing Table 95

Setting BGP Administrative Distance 96

Configuring a BGP Neighbor Group and Neighbors 96

Configuring a Route Reflector for BGP 99

Configuring BGP Route Filtering by Route Policy 100

Configuring BGP Attribute Filtering 102

Configuring BGP Next-Hop Trigger Delay 103

Disabling Next-Hop Processing on BGP Updates 104

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Configuring BGP Community and Extended-Community Advertisements 105

Configuring the BGP Cost Community 107

Configuring Software to Store Updates from a Neighbor 110

Configuring a VPN Routing and Forwarding Instance in BGP 112

Defining Virtual Routing and Forwarding Tables in Provider Edge Routers 112

Configuring the Route Distinguisher 114

Configuring PE-PE or PE-RR Interior BGP Sessions 115

Configuring Route Reflector to Hold Routes That Have a Defined Set of RT

Communities 118

Configuring BGP as a PE-CE Protocol 119

Redistribution of IGPs to BGP 123

Configuring Keychains for BGP 125

Disabling a BGP Neighbor 126

Resetting Neighbors Using BGP Inbound Soft Reset 127

Resetting Neighbors Using BGP Outbound Soft Reset 128

Resetting Neighbors Using BGP Hard Reset 129

Clearing Caches, Tables, and Databases 130

Displaying System and Network Statistics 131

Displaying BGP Process Information 132

Monitoring BGP Update Groups 134

Configuring BGP Nonstop Routing 135

Installing Primary Backup Path for Prefix Independent Convergence (PIC) 136

Retaining Allocated Local Label for Primary Path 137

Configuring BGP Additional Paths 138

Configuring iBGP Multipath Load Sharing 139

Originating Prefixes with AiGP 140

Configuring BGP Accept Own 142

Configuring BGP Link-State 143

Configuring BGP Link-state 143

Configuring Domain Distinguisher 144

Configuring BGP Permanent Network 145

How to Advertise Permanent Network 147

Enabling BGP Unequal Cost Recursive Load Balancing 148

Configuring VRF Dynamic Route Leaking 150

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Enabling Selective VRF Download 152

Disabling Selective VRF Download 154

Configuring Resilient Per-CE Label Allocation Mode 155

Configuring Resilient Per-CE Label Allocation Mode Under VRF Address Family 155

Configuring Resilient Per-CE Label Allocation Mode Using a Route-Policy 157

Configuration Examples for Implementing BGP 159

Enabling BGP: Example 159

Displaying BGP Update Groups: Example 160

BGP Neighbor Configuration: Example 161

BGP Confederation: Example 161

BGP Route Reflector: Example 163

BGP Nonstop Routing Configuration: Example 163

Primary Backup Path Installation: Example 164

Allocated Local Label Retention: Example 164

iBGP Multipath Loadsharing Configuration: Example 164

Originating Prefixes With AiGP: Example 164

BGP Accept Own Configuration: Example 165

BGP Unequal Cost Recursive Load Balancing: Example 165

VRF Dynamic Route Leaking Configuration: Example 167

Resilient Per-CE Label Allocation Mode Configuration: Example 168

Configuring Resilient Per-CE Label Allocation Mode Under VRF Address Family:

Example 168

Configuring Resilient Per-CE Label Allocation Mode Using a Route-Policy:

Example 168

Where to Go Next 168

Additional References 168

CHAPTER 3

Implementing BFD 173

Prerequisites for Implementing BFD 175

Restrictions for Implementing BFD 176

Information About BFD 177

Differences in BFD in Cisco IOS XR Software and Cisco IOS Software 177

BFD Multipath Sessions Support on nV Edge System 177

BFD Modes of Operation 178

BFD Packet Information 179

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BFD Source and Destination Ports 179

BFD Packet Intervals and Failure Detection 179

BFD Packet Intervals on Physical Interfaces 179

BFD Packet Intervals on Bundle Member Links 179

Control Packet Failure Detection In Asynchronous Mode 180

Echo Packet Failure Detection In Asynchronous Mode 180

Echo Failure Detection Examples 180

Summary of Packet Intervals and Failure Detection Times for BFD on Bundle

Interfaces 182

Echo Packet Latency 183

Priority Settings for BFD Packets 183

BFD for IPv4 183

Enabling BFD on a Static Route 185

BFD for IPv6 186

BFD on Bundled VLANs 186

BFD Over Member Links on Link Bundles 187

Overview of BFD State Change Behavior on Member Links and Bundle Status 188

BFD Multipath Sessions 189

BFD for MultiHop Paths 190

Setting up BFD Multihop 190

BFD over MPLS Traffic Engineering LSPs 190

Bidirectional Forwarding Detection over Logical Bundle 191

Bidirectional Forwarding Detection over Generic Routing Encapsulation 191

Bidirectional Forwarding Detection IPv6 Multihop 192

BFD over Pseudowire Headend 192

BFD over Satellite Interfaces 192

BFD over IRB 193

BFD Dampening 193

BFD Hardware Offload 194

BFD Object Tracking 195

How to Configure BFD 195

BFD Configuration Guidelines 195

Configuring BFD Under a Dynamic Routing Protocol or Using a Static Route 196

Enabling BFD on a BGP Neighbor 196

Enabling BFD for OSPF on an Interface 197

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Enabling BFD for OSPFv3 on an Interface 199

Enabling BFD on a Static Route 201

Configuring BFD on Bundle Member Links 202

Prerequisites for Configuring BFD on Bundle Menmber Links 202

Specifying the BFD Destination Address on a Bundle 203

Enabling BFD Sessions on Bundle Members 203

Configuring the Minimum Thresholds for Maintaining an Active Bundle 204

Configuring BFD Packet Transmission Intervals and Failure Detection Times on a

Bundle 205

Configuring Allowable Delays for BFD State Change Notifications Using Timers on

a Bundle 207

Enabling Echo Mode to Test the Forwarding Path to a BFD Peer 208

Overriding the Default Echo Packet Source Address 208

Specifying the Echo Packet Source Address Globally for BFD 208

Specifying the Echo Packet Source Address on an Individual Interface or Bundle 209

Configuring BFD Session Teardown Based on Echo Latency Detection 210

Delaying BFD Session Startup Until Verification of Echo Path and Latency 211

Disabling Echo Mode 212

Disabling Echo Mode on a Router 212

Disabling Echo Mode on an Individual Interface or Bundle 213

Minimizing BFD Session Flapping Using BFD Dampening 214

Enabling and Disabling IPv6 Checksum Support 215

Enabling and Disabling IPv6 Checksum Calculations for BFD on a Router 215

Enabling and Disabling IPv6 Checksum Calculations for BFD on an Individual Interface

or Bundle 216

Clearing and Displaying BFD Counters 217

Configuring Coexistence Between BFD over Bundle (BoB) and BFD over Logical Bundle

(BLB) 218

Configuring BFD IPv6 Multihop 219

Configuring BFD IPv6 Multihop for eBGP Neighbors 219

Configuring BFD IPv6 Multihop for iBGP Neighbors 220

Configuring BFD over MPLS Traffic Engineering LSPs 221

Enabling BFD Parameters for BFD over TE Tunnels 221

Configuring BFD Bring up Timeout 222

Configuring BFD Dampening for TE Tunnels 223

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Configuring Periodic LSP Ping Requests 224

Configuring BFD at the Tail End 225

Configuring BFD over LSP Sessions on Line Cards 226

Configuring BFD Object Tracking: 227

Configuration Examples for Configuring BFD 228

BFD Over BGP: Example 228

BFD Over OSPF: Examples 228

BFD Over Static Routes: Examples 229

BFD on Bundled VLANs: Example 229

BFD on Bundle Member Links: Examples 230

Echo Packet Source Address: Examples 231

Echo Latency Detection: Examples 232

Echo Startup Validation: Examples 232

BFD Echo Mode Disable: Examples 232

BFD Dampening: Examples 233

BFD IPv6 Checksum: Examples 233

BFD Peers on Routers Running Cisco IOS and Cisco IOS XR Software: Example 234

Configuring BFD IPv6 Multihop: Examples 234

BFD over MPLS TE LSPs: Examples 235

BFD over MPLS TE Tunnel Head-end Configuration: Example 235

BFD over MPLS TE Tunnel Tail-end Configuration: Example 235

Where to Go Next 235

Additional References 235

Related Documents 236

Standards 236

RFCs 236

MIBs 236

Technical Assistance 237

CHAPTER 4

Implementing EIGRP 239

Prerequisites for Implementing EIGRP 240

Restrictions for Implementing EIGRP 240

Information About Implementing EIGRP 240

EIGRP Functional Overview 240

EIGRP Features 241

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EIGRP Components 241

EIGRP Configuration Grouping 242

EIGRP Configuration Modes 242

EIGRP Interfaces 243

Redistribution for an EIGRP Process 244

Metric Weights for EIGRP Routing 244

Mismatched K Values 244

Goodbye Message 245

Percentage of Link Bandwidth Used for EIGRP Packets 245

Floating Summary Routes for an EIGRP Process 245

Split Horizon for an EIGRP Process 247

Adjustment of Hello Interval and Hold Time for an EIGRP Process 248

Stub Routing for an EIGRP Process 248

Route Policy Options for an EIGRP Process 249

EIGRP Layer 3 VPN PE-CE Site-of-Origin 250

Router Interoperation with the Site-of-Origin Extended Community 250

Route Manipulation using SoO match condition 251

EIGRP v4/v6 Authentication Using Keychain 252

EIGRP Wide Metric Computation 252

EIGRP Multi-Instance 253

How to Implement EIGRP 253

Enabling EIGRP Routing 253

Configuring Route Summarization for an EIGRP Process 255

Redistributing Routes for EIGRP 257

Creating a Route Policy and Attaching It to an EIGRP Process 259

Configuring Stub Routing for an EIGRP Process 260

Configuring EIGRP as a PE-CE Protocol 261

Redistributing BGP Routes into EIGRP 263

Monitoring EIGRP Routing 265

Configuring an EIGRP Authentication Keychain 267

Configuring an Authentication Keychain for an IPv4/IPv6 Interface on a Default

VRF 267

Configuring an Authentication Keychain for an IPv4/IPv6 Interface on a Nondefault

VRF 268

Configuration Examples for Implementing EIGRP 269

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Configuring a Basic EIGRP Configuration: Example 269

Configuring an EIGRP Stub Operation: Example 270

Configuring an EIGRP PE-CE Configuration with Prefix-Limits: Example 270

Configuring an EIGRP Authentication Keychain: Example 271

Additional References 271

CHAPTER 5

Implementing IS-IS 273

Prerequisites for Implementing IS-IS 273

Restrictions for Implementing IS-IS 273

Information About Implementing IS-IS 274

IS-IS Functional Overview 274

Key Features Supported in the Cisco IOS XR IS-IS Implementation 274

IS-IS Configuration Grouping 275

IS-IS Configuration Modes 275

Router Configuration Mode 275

Router Address Family Configuration Mode 275

Interface Configuration Mode 275

Interface Address Family Configuration Mode 276

IS-IS Interfaces 276

Multitopology Configuration 276

IPv6 Routing and Configuring IPv6 Addressing 276

Limit LSP Flooding 277

Flood Blocking on Specific Interfaces 277

Mesh Group Configuration 277

Maximum LSP Lifetime and Refresh Interval 277

Single-Topology IPv6 Support 278

Multitopology IPv6 for IS-IS 278

IS-IS Authentication 278

Nonstop Forwarding 279

Multi-Instance IS-IS 280

Multiprotocol Label Switching Traffic Engineering 280

Overload Bit on Router 280

Overload Bit Configuration During Multitopology Operation 281

IS-IS Overload Bit Avoidance 281

Default Routes 281

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Attached Bit on an IS-IS Instance 281

IS-IS Support for Route Tags 282

Multicast-Intact Feature 282

Multicast Topology Support Using IS-IS 282

MPLS Label Distribution Protocol IGP Synchronization 283

MPLS LDP-IGP Synchronization Compatibility with LDP Graceful Restart 283

MPLS LDP-IGP Synchronization Compatibility with IGP Nonstop Forwarding 283

Label Distribution Protocol IGP Auto-configuration 284

MPLS TE Forwarding Adjacency 284

MPLS TE Interarea Tunnels 284

IP Fast Reroute 284

Unequal Cost Multipath Load-balancing for IS-IS 285

Enabling IS-IS and Configuring Level 1 or Level 2 Routing 285

Configuring Single Topology for IS-IS 287

Configuring Multitopology Routing 291

Restrictions for Configuring Multitopology Routing 291

Information About Multitopology Routing 291

Configuring a Global Topology and Associating It with an Interface 292

Enabling an IS-IS Topology 293

Placing an Interface in a Topology in IS-IS 294

Configuring a Routing Policy 295

Configuring Multitopology for IS-IS 296

Controlling LSP Flooding for IS-IS 296

Configuring Nonstop Forwarding for IS-IS 300

Configuring Authentication for IS-IS 302

Configuring Keychains for IS-IS 303

Configuring MPLS Traffic Engineering for IS-IS 304

Tuning Adjacencies for IS-IS 306

Setting SPF Interval for a Single-Topology IPv4 and IPv6 Configuration 309

Customizing Routes for IS-IS 311

Configuring MPLS LDP IS-IS Synchronization 313

Enabling Multicast-Intact 314

Tagging IS-IS Interface Routes 315

Setting the Priority for Adding Prefixes to the RIB 317

Configuring IP/LDP Fast Reroute 318

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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

MD5 Authentication 339

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Authentication Strategies 340

Key Rollover 340

Neighbors and Adjacency for OSPF 340

Designated Router (DR) for OSPF 340

Default Route for OSPF 341

Link-State Advertisement Types for OSPF Version 2 341

Link-State Advertisement Types for OSPFv3 342

Virtual Link and Transit Area for OSPF 343

Passive Interface 343

OSPFv2 Sham Link Support for MPLS VPN 344

OSPFv3 Sham Link Support for MPLS VPN 345

Graceful Restart Procedure over the Sham-link 346

ECMP and OSPFv3 Sham-link 346

OSPF SPF Prefix Prioritization 346

Route Redistribution for OSPF 347

OSPF Shortest Path First Throttling 347

Nonstop Forwarding for OSPF Version 2 348

Graceful Shutdown for OSPFv3 349

Modes of Graceful Restart Operation 349

Restart Mode 349

Helper Mode 350

Protocol Shutdown Mode 350

Protocol Restoration 351

Graceful Restart Requirements and Restrictions 351

Warm Standby and Nonstop Routing for OSPF Version 2 352

Warm Standby for OSPF Version 3 353

Multicast-Intact Support for OSPF 353

Load Balancing in OSPF Version 2 and OSPFv3 353

Multi-Area Adjacency for OSPF Version 2 354

Label Distribution Protocol IGP Auto-configuration for OSPF 354

OSPF Authentication Message Digest Management 355

GTSM TTL Security Mechanism for OSPF 355

Path Computation Element for OSPFv2 355

OSPF IP Fast Reroute Loop Free Alternate 356

Management Information Base (MIB) for OSPFv3 356

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VRF-lite Support for OSPFv2 357

OSPFv3 Timers Link-state Advertisements and Shortest Path First Throttle Default Values

Update 357

Unequal Cost Multipath Load-balancing for OSPF 357

How to Implement OSPF 358

Enabling OSPF 358

Configuring Stub and Not-So-Stubby Area Types 360

Configuring Neighbors for Nonbroadcast Networks 362

Configuring Authentication at Different Hierarchical Levels for OSPF Version 2 366

Controlling the Frequency That the Same LSA Is Originated or Accepted for OSPF 369

Creating a Virtual Link with MD5 Authentication to Area 0 for OSPF 371

Examples 374

Summarizing Subnetwork LSAs on an OSPF ABR 375

Redistribute Routes into OSPF 377

Configuring OSPF Shortest Path First Throttling 379

Examples 381

Configuring Nonstop Forwarding Specific to Cisco for OSPF Version 2 381

Configuring OSPF Version 2 for MPLS Traffic Engineering 383

Examples 385

Configuring OSPFv3 Graceful Restart 387

Displaying Information About Graceful Restart 388

Configuring an OSPFv2 Sham Link 389

Enabling Nonstop Routing for OSPFv2 392

Enabling Nonstop Routing for OSPFv3 393

Configuring OSPF SPF Prefix Prioritization 393

Enabling Multicast-intact for OSPFv2 395

Associating Interfaces to a VRF 395

Configuring OSPF as a Provider Edge to Customer Edge (PE-CE) Protocol 397

Creating Multiple OSPF Instances (OSPF Process and a VRF) 399

Configuring Multi-area Adjacency 400

Configuring Label Distribution Protocol IGP Auto-configuration for OSPF 402

Configuring LDP IGP Synchronization: OSPF 403

Configuring Authentication Message Digest Management for OSPF 404

Examples 405

Configuring Generalized TTL Security Mechanism (GTSM) for OSPF 406

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Examples 408

Verifying OSPF Configuration and Operation 408

Configuring IP Fast Reroute Loop-free Alternate 411

Enabling IPFRR LFA 411

Excluding an Interface From IP Fast Reroute Per-link Computation 412

Enabling OSPF Interaction with SRMS Server 412

Configuration Examples for Implementing OSPF 414

Cisco IOS XR Software for OSPF Version 2 Configuration: Example 414

CLI Inheritance and Precedence for OSPF Version 2: Example 415

MPLS TE for OSPF Version 2: Example 416

ABR with Summarization for OSPFv3: Example 416

ABR Stub Area for OSPFv3: Example 417

ABR Totally Stub Area for OSPFv3: Example 417

Configuring OSPF SPF Prefix Prioritization: Example 417

Route Redistribution for OSPFv3: Example 418

Virtual Link Configured Through Area 1 for OSPFv3: Example 418

Virtual Link Configured with MD5 Authentication for OSPF Version 2: Example 419

VPN Backbone and Sham Link Configured for OSPF Version 2: Example 420

Where to Go Next 421

Additional References 421

CHAPTER 7

Implementing and Monitoring RIB 425

Prerequisites for Implementing RIB 426

Information About RIB Configuration 426

Overview of RIB 426

RIB Data Structures in BGP and Other Protocols 426

RIB Administrative Distance 427

RIB Support for IPv4 and IPv6 427

RIB Statistics 428

IPv6 Provider Edge IPv6 and IPv6 VPN Provider Edge Transport over MPLS 428

RIB Quarantining 428

Route and Label Consistency Checker 429

How to Deploy and Monitor RIB 430

Verifying RIB Configuration Using the Routing Table 430

Verifying Networking and Routing Problems 431

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Disabling RIB Next-hop Dampening 432

Configuring RCC and LCC 433

Enabling RCC and LCC On-demand Scan 433

Enabling RCC and LCC Background Scan 434

BGP-RIB Feedback Mechanism for Update Generation 436

Configuration Examples for RIB Monitoring 436

Output of show route Command: Example 436

Output of show route backup Command: Example 437

Output of show route best-local Command: Example 437

Output of show route connected Command: Example 437

Output of show route local Command: Example 438

Output of show route longer-prefixes Command: Example 438

Output of show route next-hop Command: Example 438

Enabling RCC and LCC: Example 439

Where to Go Next 439

Additional References 440

CHAPTER 8

Implementing RIP 443

Prerequisites for Implementing RIP 444

Information About Implementing RIP 444

RIP Functional Overview 444

Split Horizon for RIP 445

Route Timers for RIP 445

Route Redistribution for RIP 446

Default Administrative Distances for RIP 446

Routing Policy Options for RIP 447

Authentication Using Keychain in RIP 447

In-bound RIP Traffic on an Interface 448

Out-bound RIP Traffic on an Interface 449

How to Implement RIP 449

Enabling RIP 449

Customizing RIP 451

Control Routing Information 453

Creating a Route Policy for RIP 455

Configuring RIP Authentication Keychain 456

Cisco ASR 9000 Series Aggregation Services Router Routing Configuration Guide, Release 5.1.x

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Contents

Configuring RIP Authentication Keychain for IPv4 Interface on a Non-default

VRF 456

Configuring RIP Authentication Keychain for IPv4 Interface on Default VRF 458

Configuration Examples for Implementing RIP 459

Configuring a Basic RIP Configuration: Example 459

Configuring RIP on the Provider Edge: Example 459

Adjusting RIP Timers for each VRF Instance: Example 460

Configuring Redistribution for RIP: Example 460

Configuring Route Policies for RIP: Example 461

Configuring Passive Interfaces and Explicit Neighbors for RIP: Example 461

Controlling RIP Routes: Example 462

Configuring RIP Authentication Keychain: Example 462

Additional References 462

CHAPTER 9

Implementing Routing Policy 465

Prerequisites for Implementing Routing Policy 466

Restrictions for Implementing Routing Policy 466

Information About Implementing Routing Policy 467

Routing Policy Language 467

Routing Policy Language Overview 467

Routing Policy Language Structure 468

Names 468

Sets 468

as-path-set 469

community-set 470

extcommunity-set 471

prefix-set 474

ACL Support in RPL Prefix Sets 476

rd-set 476

Routing Policy Language Components 476

Routing Policy Language Usage 477

RPL Variables 479

Routing Policy Configuration Basics 479

Policy Definitions 479

Parameterization 480

Cisco ASR 9000 Series Aggregation Services Router Routing Configuration Guide, Release 5.1.x

xx OL-30423-03

Contents

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Cisco ASR 9000 Series Configuration manual

Cisco ASR 9000 Series Configuration manual

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