Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide

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Cisco ASR 901 Series Aggregation Services Router SoftwareConfiguration GuideFirst Published:November 10, 2011

Last Modified: March 26, 2015

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C O N T E N T S

P r e f a c e About This Guide xlix

About This Guide xlix

Document Revision History xlix

Objectives lxixAudience lxix

Organization lxix

Organization lxxiii

Conventions lxxvi

Related Documentation lxxvii

Obtaining Documentation and Submitting a Service Request lxxviii

C H A P T E R 1 Cisco ASR 901 Cisco ASR 901S Router Overview 1

Introduction 2

Features 3

Performance Features 3

Management Options 3

Manageability Features 4

Security Features 4

Quality of Service and Class of Service Features 5

Layer 3 Features 5

Layer 3 VPN Services 6

Monitoring Features 6

C H A P T E R 2 Licensing 7

Finding Feature Information 7

Feature Overview 8

Licenses Supported on Cisco ASR 901 Cisco ASR 901S Router 8

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License Types 11

Image Level License 11

Features Supported 12

Feature Based License12

Port Based/Mode License 13

1588BC License 14

Port or Interface Behavior 14

Port Based License 14

Example: When Port Based License is not Installed 14

Example: When Port Based License is Installed 15

10gigUpgrade License 15

Example: When 10gigUpgrade License is not Installed 15

Example: When 10gigUpgrade License is Installed 16

Flexi License 17

Example: When Flexi License is not Installed 17

Example: When Flexi License is Installed 17

1588BC License 18

Example: When 1588BC License is not Installed 18

Example: When 1588BC License is Installed 18

Removing the License 19

Generating the License 19Installing the License 20

Changing the License 21

Verifying the License 21

Where to Go Next 21

Additional References 22

Feature Information for Licensing 23

C H A P T E R 3 First-Time Configuration 25

Setup Mode 25

Before Starting Your Router 25

Using Setup Mode 25

Configuring Global Parameters 26

Completing the Configuration 29

Verifying the Cisco IOS Software Version 29

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Configuring the Hostname and Password 30

Verifying the Hostname and Password 31

C H A P T E R 4

Managing and Monitoring Network Management Features 33Finding Feature Information 34

Network Management Features for the Cisco ASR 901 Cisco ASR 901S 34

Cisco Active Network Abstraction (ANA) 34

SNMP MIB Support 34

Cisco Networking Services (CNS) 34

How to Configure Network Management Features on Cisco ASR 901 Cisco ASR 901S 35

Configuring SNMP Support 35

Configuring Remote Network Management 38

Enabling Cisco Networking Services (CNS) and Zero-Touch Deployment 40

Zero-Touch Deployment 40

Image Download 41

Configuring a DHCP Server 42

Configuring a TFTP Server 43

Creating a Bootstrap Configuration 43

Enabling a TFTP Server on the Edge Router 44

Configuring the Cisco Configuration Engine 44

Configuration Examples 44

Example: Configuring SNMP Support 45

Example: Configuring Remote Network Management 45

Example: Configuring a DHCP Server 45

Example: Zero-touch Deployment 45

Configuring LEDs 46

Disabling and Enabling LEDs 47

Configuring Alarm Port Monitoring 48

Disabling and Enabling Alarms 48

Alarm Port Monitoring 49

External Alarm Port Monitoring 49

Enabling Alarms 50

Enabling Syslogs 51

Enabling SNMP Traps 51

Verifying Alarm Configuration 52

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Where to Go Next 53


Feature Information for Monitoring and Managing the Cisco ASR 901 Cisco ASR 901S

Router 55

C H A P T E R 5 Using the Command-Line Interface 57

Understanding Command Modes 57

Understanding the Help System 59

Understanding Abbreviated Commands 60

Understanding no and default Forms of Commands 60

Understanding CLI Error Messages 60

Using Command History 61

Changing the Command History Buffer Size 61

Recalling Commands 62

Disabling the Command History Feature 62

Using Editing Features 62

Enabling and Disabling Editing Features 62

Editing Commands through Keystrokes 63

Editing Command Lines that Wrap 65

Searching and Filtering Output of show and more Commands 65

Accessing the CLI 66

Accessing the CLI through a Console Connection or through Telnet 66

Saving Configuration Changes 66

C H A P T E R 6 Software Upgrade 67

Selecting a Cisco IOS Image 67

Upgrading the Cisco IOS image 67

Auto Upgrading the MCU 72

Manually Upgrading the ROMMON 72

Auto Upgrade of ROMMON 73

C H A P T E R 7 Configuring Gigabit Ethernet Interfaces 75

Configuring the Interface 75

Setting the Speed and Duplex Mode 76

Enabling the Interface 77

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Modifying MTU Size on the Interface 78

Verifying the MTU Size 79

MAC Flap Control 79

Configuring MAC FLap Control80

Configuring a Combo Port 81

Verifying the Media Type 82

C H A P T E R 8 Configuring Ethernet Virtual Connections 85


Supported EVC Features 86

Understanding EVC Features 86

Ethernet Virtual Connections 87

Service Instances and EFPs 87

Encapsulation 88

VLAN Counters 89

Bridge Domains 89

DHCP Client on Switch Virtual Interface 90

Split-Horizon 90

Rewrite Operations 90

DHCP Snooping with Option 82 on EVC 91

DHCP Client FORCERENEW Message Overview 92

DHCP Forcerenew Limitations 92

Configuring EFPs 92

Default EVC Configuration 93

Configuring VLAN Counters on SVI 93

Verifying VLAN Counters Configuration on SVI 94

Configuration Guidelines 94

Creating Service Instances 95

Configuring DHCP Snooping with Option-82 on EVC 96

Forcing a Release or Renewal of a DHCP Lease for a DHCP Client 97

Configuring FORCERENEW Message Handling 98

Configuring Per-Port Rate Limit 99

Verifying DHCP Snooping with Option 82 on EVC 100

Example: Configuring DHCP Snooping with Option 82 on EVC 101

Configuration Examples of Supported Features 102

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Example: Configuring a Service Instance 102

Example: Encapsulation Using a VLAN Range 102

Example: Configuring VLAN Counters on SVI 103

Example: Two Service Instances Joining the Same Bridge Domain103

Example: Bridge Domains and VLAN Encapsulation 103

Example: Rewrite 103

Example: Split Horizon 104

Examples: Releasing a DHCP Lease 104

Examples: Renewing a DHCP Lease 104

How to Configure EVC Default Encapsulation 105

Configuring EVC Default Encapsulation with Bridge-Domain 105

Configuring EVC Default Encapsulation with Xconnect 106

Verifying EVC Default Encapsulation with Bridge-Domain 107

Verifying EVC Default Encapsulation with Xconnect 107

Configuration Examples for EVC Default Encapsulation 108

Example: Configuring EVC Default Encapsulation with Bridge-Domain 108

Example: Configuring EVC Default Encapsulation with Xconnect 108

Configuring Other Features on EFPs 108

EFPs and EtherChannels 108

MAC Address Forwarding, Learning and Aging on EFPs 108

Disabling MAC Address Learning on an Interface or Bridge Domain 109Example: Configuring EFP and EtherChannels 110

Verification 111

Configuring IEEE 802.1Q Tunneling using EFPs 112

Restrictions 112

802.1Q Tunneling (QinQ) 112

Example: Configuring IEEE 802.1Q Tunneling Using EFPs 114

Routed QinQ 115

Restrictions 115

Configuration Examples for Routed QinQ 115

Example: User to Network Interface 115

Example: Network to Network Interface/Core Router 115

Bridge Domain Routing 116

Restrictions 116

Example: Configuring Bridge-Domain Routing 116

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How to Configure DHCP Client on SVI 116

Configuring DHCP Client on SVI 117

Verifying DHCP Client on SVI 118

Example: Configuring DHCP Client on SVI118

EFPs and MAC Addresses 118

EFPs and MSTP 118

Monitoring EVC 119

Configuring Switchport to EVC Mapping 121

Example: Configuring Switchport to EVC Mapping 121

Troubleshooting DHCP Snooping with Option-82 on EVC 123


Feature Information for Configuring Ethernet Virtual Connections 124

C H A P T E R 9 Configuring EtherChannels 127

Understanding How EtherChannels Work 127

EtherChannel Feature Overview 127

Understanding How EtherChannels Are Configured 128

EtherChannel Configuration Overview 128

Understanding Manual EtherChannel Configuration 128

Understanding IEEE 802.3ad LACP EtherChannel Configuration 128

Understanding Port-Channel Interfaces 130

Understanding Load Balancing 130

EtherChannel Configuration Guidelines and Restrictions 130

Configuring Etherchannels 131

Configuring Channel Groups 131

Configuring the LACP System Priority and System ID 132

Configuring the LACP Transmit Rate 133

Verifying the LACP Transmit Rate 134

Configuring EtherChannel Load Balancing 134

Modifying MTU Size on Port-Channel 135

Verifying the MTU Size on Port-Channel 136

EVC On Port-Channel 137

Restrictions for EVC EtherChannel 137

Configuring EVC on Port-Channel 137

Verifying the Configuration 138

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Troubleshooting Scenarios for EVC on a Port-Channel 139

C H A P T E R 1 0 Configuring Ethernet OAM 141

Understanding Ethernet CFM 142IP SLA Support for CFM 142

Configuring Ethernet CFM 142

Default Ethernet CFM Configuration 143

Ethernet CFM Configuration Restrictions and Guidelines 143

Configuring the CFM Domain 143

Configuring Multi-UNI CFM MEPs in the Same VPN 147

Configuration Examples for Multi-UNI CFM MEPs 151

Verification 152

Configuring Ethernet CFM Crosscheck 153

Configuring Static Remote MEP 154

Configuring a Port MEP 155

CFM with Hardware Offloading for G.8032 157

Restrictions 157

Configuring CFM with Hardware Offloading for G.8032 158

Verifying the CFM Configuration with Hardware Offloading for G.8032 159

Configuration Examples for CFM with Hardware Offloading for G.8032 160

Configuring SNMP Traps 160

Configuring IP SLA CFM Operation 161

Manually Configuring an IP SLA CFM Probe or Jitter Operation 161

Configuring an IP SLA Operation with Endpoint Discovery 164

Configuring CFM over EFP with Cross Connect 166

Configuring CFM over EFP Interface with Cross Connect 166

Examples 168

Configuring CFM over EFP Interface with Cross ConnectPort Channel-Based Cross

Connect Tunnel 168

Examples 168

Verification 169

Configuring CFM with EVC Default Encapsulation 170

Verifying CFM with EVC Default Encapsulation 171

Example: Configuring CFM with EVC Default Encapsulation 172

Configuring Y.1731 Fault Management 172

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Default Y.1731 Configuration 172

Configuring ETH-AIS 172

Configuring ETH-LCK 174

Managing and Displaying Ethernet CFM Information177

Understanding the Ethernet OAM Protocol 179

OAM Features 180

Discovery 180

Link Monitoring 180

Remote Failure Indication 181

Remote Loopback 181

Cisco Vendor-Specific Extensions 181

OAM Messages 181

Setting Up and Configuring Ethernet OAM 182

Default Ethernet OAM Configuration 182

Restrictions and Guidelines 182

Enabling Ethernet OAM on an Interface 183

Configuration Example 184

Enabling Ethernet OAM Remote Loopback 184

Configuring Ethernet OAM Link Monitoring 185

Configuring Ethernet OAM Remote Failure Indications 188

Configuring Ethernet OAM Templates 189Configuration Example 192

Displaying Ethernet OAM Protocol Information 192

Verifying Ethernet OAM Configuration 193

Understanding E-LMI 195

Restrictions 195

Configuring E-LMI 196

Default E-LMI Configuration 196

Enabling E-LMI 196

Displaying E-LMI Information 197

Understanding Ethernet Loopback 198

Configuring Ethernet Loopback 198

Restrictions 198

Enabling Ethernet Loopback 199


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Configuring Y.1564 to Generate Ethernet Traffic 202

Configuring IP SLA for Traffic Generation 205


Example: Two-Way Measurement208

Example: Traffic Generation Mode 209

C H A P T E R 1 1 ITU-T Y.1731 Performance Monitoring 211


Prerequisites for ITU-T Y.1731 Performance Monitoring 211

Restrictions for ITU-T Y.1731 Performance Monitoring 212

Information About ITU-T Y.1731 Performance Monitoring 213

Frame Delay and Frame-Delay Variation 213

Frame Loss Ratio 214

On-Demand and Concurrent Operations 215

Supported Interfaces 215

Benefits of ITU-T Y.1731 Performance Monitoring 216

How to Configure ITU-T Y.1731 Performance Monitoring 216

Configuring Two-Way Delay Measurement 216

What to Do Next 219

Configuring Two-Way Delay Measurement on Xconnect (EoMPLS) 219

Example: Verifying Y.1731 Two Way ETH-DM on Xconnect (EoMPLS) 221

Example: Configuring Y.1731 Two Way ETH-DM on Xconnect (EoMPLS) 221

Configuring Single-Ended Synthetic Loss Measurement 223

What to Do Next 227

Scheduling IP SLAs Operations 227

Verifying the Frame Delay and Synthetic Loss Measurement Configurations 228

Example: Verifying Sender MEP for a Two-Way Delay Measurement Operation 228

Example: Verifying Receiver MEP for a Two-Way Delay Measurement Operation 229

Example: Verifying Sender MEP for a Synthetic Loss Measurement Operation 229

Example: Verifying Ethernet CFM Performance Monitoring 230

Example: Verifying History for IP SLAs Operations 231

How to Configure IP SLAs Y.1731 On-Demand and Concurrent Operations 231

Configuring Direct On-Demand Operation on a Sender MEP 231

Configuring Referenced On-Demand Operation on a Sender MEP 232

Configuring IP SLAs Y.1731 Concurrent Operation on a Sender MEP 233

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Configuration Examples for IP SLAs Y.1731 On-Demand Operations 233

Example: On-Demand Operation in Direct Mode 233

Example: On-Demand Operation in Referenced Mode 234

Additional References234

Feature Information for ITU-T Y.1731 Performance Monitoring 236

C H A P T E R 1 2 Configuring Resilient Ethernet Protocol 239

Understanding Resilient Ethernet Protocol 239

Overview 239

Restrictions 241

Link Integrity 241

Fast Convergence 242

VLAN Load Balancing (VLB) 242

Spanning Tree Interaction 244

REP Ports 244

Configuring Resilient Ethernet Protocol 245

Default REP Configuration 245

REP Configuration Guidelines 245

Configuring the REP Administrative VLAN 247

Configuring REP Interfaces 248

Configuring REP as Dual Edge No-Neighbor Port 252

Cisco ASR 901 Cisco ASR 901S Dual Rep Edge No-Neighbor Topology Example 254

Setting up Manual Preemption for VLAN Load Balancing 256

Configuring SNMP Traps for REP 257

Monitoring REP 258

Configuration Examples for REP 258

Configuring the REP Administrative VLAN: Example 259

Configuring a REP Interface: Example 259

Setting up the Preemption for VLAN Load Balancing: Example 260

Configuring SNMP Traps for REP: Example 260

Monitoring the REP Configuration: Example 260

Cisco Cisco ASR 901 Cisco ASR 901S Topology Example 261

C H A P T E R 1 3 Configuring MST on EVC Bridge Domain 265

Overview of MST and STP 265

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Overview of MST on EVC Bridge Domain 266

Restrictions and Guidelines 266

Configuring MST on EVC Bridge Domain 268

Configuration Example for MST on EVC Bridge Domain269

Verification 270

Troubleshooting Tips 272

C H A P T E R 1 4 Multiprotocol Label Switching 275

Configuring Multiprotocol Label Switching 275

C H A P T E R 1 5 Configuring EoMPLS 277

Understanding EoMPLS 277

Restrictions for EoMPLS 278

Configuring EoMPLS 279

EoMPLS Configuration Example 280

Configuring EVC Default Encapsulation with xconnect 281

Verifying EVC Default Encapsulation with xconnect 282

Configuration Example for EVC Default Encapsulation with Xconnect 282

Configuring Pseudowire Redundancy 283

Configuration Commands 283

Port-Based EoMPLS 284

Feature Information for Configuring EoMPLS 285

C H A P T E R 1 6 Configuring MPLS VPNs 287

Understanding MPLS VPNs 287

Configuring MPLS VPNs 288

Configuration Examples for MPLS VPN 288

C H A P T E R 1 7 Configuring MPLS OAM 295

Understanding MPLS OAM 295

LSP Ping 295

LSP Traceroute 296

LSP Ping over Pseudowire 296

Configuring MPLS OAM 296

Using LSP Ping for LDP IPv4 FEC 297

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Using LSP Traceroute for LDP IPv4 FEC 297

Using LSP Ping for Pseudowire 297

Using LSP Traceroute over Pseudowire 298

Displaying AToM VCCV capabilities298

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C H A P T E R 1 8 Configuring Routing Protocols 299

Configuring Routing Protocols 299

Changing Default Hashing Algorithm for ECMP 300

C H A P T E R 1 9 Configuring Bidirectional Forwarding Detection 301

Understanding BFD 301

Configuring BFD 301

BFD Configuration Guidelines and Restrictions 301

Configuring BFD for OSPF 302

Configuring BFD for OSPF on One of More Interfaces 302

Configuring BFD for OSPF on All Interfaces 303

Configuring BFD for BGP 303

Configuring BFD for IS-IS 304

Configuring BFD for IS-IS on a Single Interface 304

Configuring BFD for IS-IS for All Interfaces 305

Configuring BFD for Static Routes 306

Configuration Examples for BFD 307

BFD with OSPF on All Interfaces 307

BFD with OSPF on Individual Interfaces 308

BFD with BGP 308

BFD with IS-IS on All Interfaces 308

BFD with IS-IS on Individual Interfaces 309

BFD with Static Routes 309

C H A P T E R 2 0 Configuring T1/E1 Controllers 311

Configuring the Card Type 311

Configuring E1 Controllers 312

Support for Unframed E1 314

Configuring Support for Unframed E1 Controller 315

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Configuring T1 Controllers 315

Verifying Support for Unframed E1 Controller 317

Troubleshooting Controllers 318

Troubleshooting E1 Controllers318

Troubleshooting T1 Controllers 319

C H A P T E R 2 1 Configuring Pseudowire 321


Understanding Pseudowires 322

Structure-Agnostic TDM over Packet 322

Structure-Aware TDM Circuit Emulation Service over Packet-Switched Network 322

Transportation of Service Using Ethernet over MPLS 322

Limitations 323

Hot Standby Pseudowire Support for ATM/IMA 323

Configuring Pseudowire 323

Configuring Pseudowire Classes 323

Configuring CEM Classes 325

Configuring a Backup Peer 327

Configuring Structure-Agnostic TDM over Packet 328

Configuring a SAToP Pseudowire with UDP Encapsulation 329

Configuring Circuit Emulation Service over Packet-Switched Network 332

Configuring a CESoPSN Pseudowire with UDP Encapsulation 333

QoS for CESoPSN over UDP and SAToP over UDP 335

Configuring Transportation of Service Using Ethernet over MPLS 336

Configuring L2VPN Pseudowire Redundancy 337

Example: Pseudowire Redundancy 340

Configuring Hot Standby Pseudowire Support for ATM/IMA 340

Configuring ATM/IMA Pseudowire Redundancy in PVC Mode 340

Configuring ATM/IMA Pseudowire Redundancy in PVP Mode 342

Configuring ATM/IMA Pseudowire Redundancy in Port Mode 343

Verifying Hot Standby Pseudowire Support for ATM/IMA 344

TDM Local Switching 345

Restrictions 345

Configuring TDM Local Switching on a T1/E1 Mode 346

Verifying Local Switching 346

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Configuration Example for Local Switching 347

Configuration Examples of Hot Standby Pseudowire Support for ATM/IMA 347

Example: Configuring ATM/IMA Pseudowire Redundancy in PVC Mode 347

Example: Configuring ATM/IMA Pseudowire Redundancy in PVP Mode348

Example: Configuring ATM/IMA Pseudowire Redundancy in Port Mode 348

Configuration Examples for Pseudowire 348

Example: TDM over MPLS Configuration-Example 348

Example: CESoPSN with UDP 351

Example: Ethernet over MPLS 352


Feature Information for Configuring Pseudowire 354

C H A P T E R 2 2 Configuring Clocking 355

Configuring Clocking 355

Restrictions 355

Configuring Network Clock for Cisco ASR 901 Cisco ASR 901S Router 356

Configuring Network Clock in Global Configuration Mode 356

Configuring Network Clock in Interface Configuration Mode 359

Understanding SSM and ESMC 359

Synchronization Status Message 360

Ethernet Synchronization Messaging Channel 360

Clock Selection Algorithm 360

ESMC behavior for Port Channels 361

ESMC behavior for STP Blocked Ports 361

Configuring ESMC in Global Configuration Mode 361

Configuring ESMC in Interface Configuration Mode 362

Verifying ESMC Configuration 363

Managing Synchronization 364

Synchronization Example 365

Configuring Synchronous Ethernet for Copper Ports 365

Verifying the Synchronous Ethernet configuration 366


Troubleshooting ESMC Configuration 370

Configuring PTP for the Cisco ASR 901 Cisco ASR 901S Router 370

Restrictions 371

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Precision Time Protocol 371

IEEEV2 Best Master Clock Algorithm Overview 372

Information About Best Master Clock Algorithm 372

Setting System Time to Current Time374

Configuring PTP Ordinary Clock 374

Configuring Master Ordinary Clock 374

Configuring Slave Ordinary Clock 376

Configuring PTP in Unicast Mode 379

Configuring PTP in Unicast Negotiation Mode 380

Configuring PTP in Multicast Mode 381

PTP Boundary Clock 382

Configuring PTP Boundary Clock 383

Verifying PTP modes 386

Verifying PTP Configuration on the 1588V2 Slave in Unicast Mode 389

Verifying PTP Configuration on the 1588V2 Slave in Multicast Mode 390

Verifying PTP Configuration on the 1588V2 Master in Unicast Mode 393

Verifying PTP Configuration on the 1588V2 Master in Multicast Mode 394

PTP Hybrid Clock 396

Configuring a Hybrid Ordinary Clock 396

Configuring a Hybrid Boundary Clock 399

Verifying Hybrid modes 402Configuration Examples for BMCA 402

Example: Configuring a Slave Ordinary Clock in BMCA 403

Example: Configuring a Boundary Clock in BMCA 403

SSM and PTP Interaction 403

ClockClass Mapping 404

Telecom Profiles 404

PTP Redundancy 404

Configuring Telecom Profile in Slave Ordinary Clock 404

Configuring Telecom Profile in Master Ordinary Clock 406

Verifying Telecom profile 408

Setting the TimeProperties 409

ASR 901ASR 901S Negotiation Mechanism 409

Static Unicast Mode 409

VRF-Aware Precision Time Protocol 410

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Configuring VRF-Aware Precision Time Protocol 410

Examples 412

Configuring ToD on 1588V2 Slave 413

1588v2 Phase Asymmetry Correction413

Configuring Asymmetry Correction 416

Verifying 1588v2 Phase Asymmetry Correction 417

Example: Configuring 1588v2 Phase Asymmetry Correction 417


C H A P T E R 2 3 Cisco IOS IP SLA 419

Configuring IPSLA Path Discovery 419

Example for IPSLA Path Discovery 421

Two-Way Active Measurement Protocol 423

Configuring TWAMP 424

Configuring the TWAMP Server 424

Configuring the TWAMP Reflector 425

Configuring the TWAMP Reflector 425

Configuration Examples for TWAMP 425

Example: Configuring the Router as an IP SLA TWAMP server 426

Example: Configuring the Router as an IP SLA TWAMP Reflector 426

C H A P T E R 2 4 Configuring QoS 427


Understanding QoS 428

Modular QoS CLI 429

Input and Output Policies 430

Input Policy Maps 431

Output Policy Maps 431

Access Control Lists 432

Restrictions 432

Classification 432

Class Maps 433

The match Command 434

Classification Based on Layer 2 CoS 434

Classification Based on IP Precedence 435

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Classification Based on IP DSCP 435

Classification Comparisons 436

Classification Based on QoS Groups 438

Classification Based on VLAN IDs439

Classification Based on ACL 440

Table Maps 440

Policing 441

Individual Policing 442


Unconditional Priority Policing 443

Egress Policing 444

Marking 444

Congestion Management and Scheduling 445

Traffic Shaping 446

Class-Based Shaping 446

Port Shaping 447

Parent-Child Hierarchy 447

Class-Based Weighted Fair Queuing 448

Priority Queuing 449

Ingress and Egress QoS Functions 451

Configuring QoS 452QoS Limitations 452

General QoS Limitations 452

Statistics Limitations 453

Propagation Limitations 453

Classification Limitations 454

Marking Limitations 455

Congestion Management Limitations 456

ACL-based QoS Restrictions 459

Improving Feature Scalability 459

TCAM with QoS 459

QoS for MPLS over MLPPP and IP over MLPPP 459

QoS for CPU-Generated Traffic 460

Egress Shaping on the MLPPP Interfaces 460

QoS Configuration Guidelines 461

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Sample QoS Configuration 461

Configuring Classification 463

Creating a Class Map for Classifying Network Traffic 463

Creating a Policy Map for Applying a QoS Feature to Network Traffic464

Attaching the Policy Map to an Interface 465

Attaching a Policy Map to a Cross-Connect EVC 466

Configuring Marking 468

Creating a Class Map for Marking Network Traffic 468

Creating a Policy Map for Applying a QoS Feature to Network Traffic 469

Attaching the Policy Map to an Interface 470

Configuring MPLS Exp Bit Marking using a Pseudowire 471


Configuring Congestion Management 472

Configuring Low Latency Queueing 473

Configuring Multiple Priority Queueing 474


Configuring Class-Based Weighted Fair Queuing (CBFQ) 475

Weighted Random Early Detection (WRED) 477

Configuring Shaping 478

Configuring Class-Based Traffic Shaping in a Primary-Level (Parent) Policy Map 479

Configuring the Secondary-Level (Child) Policy Map 479Configuring Ethernet Trusted Mode 480

Creating IP Extended ACLs 480

Using Class Maps to Define a Traffic Class 482

Creating a Named Access List 484

What to do Next 485

TCAM with ACL 485

Configuration Examples for ACL 485

Verifying Named Access List 486

Configuration Example for Named Access List 487

Access Control Lists for IPv6 Traffic Filtering 492

Creating and Configuring an IPv6 ACL for Traffic Filtering 492


Applying the IPv6 ACL to an Interface 494


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QoS Treatment for Performance-Monitoring Protocols 495

Cisco IP-SLAs 495

QoS Treatment for IP-SLA Probes 495

Marking495

Queuing 495

QoS Marking for CPU-Generated Traffic 496

QoS Queuing for CPU-Generated Traffic 496

Extending QoS for MLPPP 497

Configuring Class-map for Matching MPLS EXP Bits 497

Configuring Class-map for Matching IP DSCP Value 498

Configuring Class-map for Matching MPLS EXP Bits or IP DSCP Value 499

Configuring a Policy-map 500

Attaching the Policy-map to MLPPP Interface 502

Re-marking IP DSCP Values of CPU Generated Traffic 504

Re-marking MPLS EXP Values of CPU Generated Traffic 505

Configuring a Policy-map to Match on CS5 and EXP4 506

Attaching the Policy-map to Match on CS5 and EXP4 to MLPPP Interface 508

Configuration Examples for Extending QoS for MPLS over MLPPP 508

Configuring Class-map for Matching MPLS EXP Bits 508

Configuring Class-map for Matching IP DSCP Value 508

Configuring Class-map for Matching MPLS EXP Bits or IP DSCP Value 509Configuring a Policy-map 509

Configuring a Policy-map to Match on CS5 and EXP 4 509

Attaching the Policy-map to MLPPP Interface 510

Configuring Egress Shaping on the MLPPP Interfaces 510

Configuring a Class-map 510

Configuring the Policy-map with Shaping 511

Attaching the Policy-map on the MLPPP Interface 511

Verifying the Egress Shaping over MLPPP Interface 513

Example: Configuring Egress Shaping over MLPPP Interface 513

Verifying MPLS over MLPPP Configuration 513

Configuration Guidelines 514

ARP-based Classification 516

Address Resolution Protocol Classification 516

Configuring ARP Classification 516

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Configuring a Class-map 516

Verifying a Class-map 517

Configuring a Policy-map 517

Verifying a Policy-map518

Attaching a Policy-map 518

Example: Configuring ARP Classification 519

ICMP-based ACL 519

ICMP-based ACL Overview 519

ICMP-based ACL Restrictions 519

Configuring IPv4 Port ACL for ICMP-based ACL 520

Configuring IPv4 Router ACL for ICMP-based ACL 521

Configuring ACL-based QoS for ICMP-based ACL 522

Configuring IPv6 Router ACL for ICMP-based ACL 523

Verifying ICMP based ACL Configuration 523

Policy for DHCP Control Packet 524



Feature Information for Configuring QoS 530

C H A P T E R 2 5 Configuring MLPPP 533


Prerequisites 534

Restrictions 534

MLPPP Optimization Features 534

Distributed Multilink Point-to-Point Protocol Offload 535

Multiclass MLPPP 535

MPLS over MLPPP 536

MPLS Features Supported for MLPPP 536

MPLS over MLPPP on PE-to-CE Links 536

MPLS over MLPPP on Core Links 537

MPLS over MLPPP on CE to PE Links 537

Configuring MLPPP Backhaul 537

Configuring the Card Type, E1 and T1 Controllers 538

Configuring a Multilink Backhaul Interface 538

Creating a Multilink Bundle 538

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Configuring MRRU 539

Configuring PFC and ACFC 540

Configuring PFC 540

Configuring ACFC541

Enabling Multilink and Identifying the Multilink Interface 542

Configuring a Serial Interface as a Member Link of a MLPPP Group 544

MLPPP Offload 545

Configuring Additional MLPPP Settings 545

Configuring MPLS over the MLPPP on a Serial Interface 545

Configuring MPLS over MLPPP for OSPF 547

Configuration Examples for MPLS over MLPPP 549

Verifying MPLS over MLPPP Configuration 550


Feature Information for MLPPP 552

C H A P T E R 2 6 Onboard Failure Logging 553

Understanding OBFL 553

Configuring OBFL 554

Verifying OBFL Configuration 554

C H A P T E R 2 7 Hot Standby Router Protocol and Virtual Router Redundancy Protocol 557


Information About HSRP and VRRP 558

Overview of HSRP and VRRP 558

Text Authentication 558

Preemption 558

How to Configure HSRP 559

Configuring HSRP 559

Configuration Examples for HSRP 561

Example: Configuring HSRP Active Router 561

Example: Configuring HSRP Backup Router 561

Example: HSRP Text Authentication 561

Information About HSRP Version 2 562

HSRP Version 2 Design 562

How to Configure HSRP Version 2 562

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Changing to HSRP Version 2 562

Configuration Examples for HSRP Version 2 564

Example: Configuring HSRP Version 2 564

How to Configure VRRP564

Configuring VRRP 565

Configuration Examples for VRRP 566

Example: Configuring a VRRP Master Router 566

Example: Configuring a VRRP Backup Router 567

Example: VRRP Text Authentication 567

Where to Go Next 567


Feature Information for HSRP and VRRP 569

C H A P T E R 2 8 Configuring Link Layer Discovery Protocol 571


Restrictions for LLDP 572

Overview of LLDP 572

How to Configure LLDP 572

Configuring LLDP 572

Verifying LLDP 574

Configuration Example for LLDP 574

Example: Enabling LLDP Globally 574

Example: Configuring Hold Time 574

Example: Configuring Delay Time 574

Example: Configuring Intervals 574

Where to go Next 575


Feature Information for LLDP 576

C H A P T E R 2 9 Configuring Multihop Bidirectional Forwarding Detection 579


Restrictions for Multihop BFD 580

Information About Multihop BFD 580

Overview of Multihop BFD 580

How to Configure Multihop BFD 580

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Configuring Multihop BFD Template 580

Configuring a Multihop BFD Map 581

Configuration Examples for Multihop BFD 582

Example : Configuring Multihop BFD582



Feature Information for Multihop BFD 584

C H A P T E R 3 0 Bit Error Rate Testing 587


Prerequisites for BERT 587

Restrictions 588

Feature Overview 588

How to Configure BERT 589

Performing BERT on a T1/E1 Line 589

Terminating BERT on a T1/E1 Controller 590

Verifying BERT on a T1/E1 Controller 590



Feature Information for Bit Error Rate Testing 592

C H A P T E R 3 1 Microwave ACM Signaling and EEM Integration 593


Prerequisites for Microwave ACM Signaling and EEM Integration 594


Benefits 595

How to Configure Microwave ACM Signaling and EEM Integration 595

Configuring Connectivity Fault Management 596

Configuring EEP Applet Using CLIs 598

Configuring Event Handler 600

Verifying Microwave Microwave ACM Signaling and EEM Integration Configuration 601

Configuration Examples for Microwave ACM Signaling and EEM Integration 602

Example: Configuring CFM 602

Example: Configuring EEP Applet 602

Example: Configuring Event Handler 605

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Feature Information for Microwave ACM Signaling and EEM Integration 606

C H A P T E R 3 2

IPv6 Support on the Cisco ASR 901 Cisco ASR 901S Router 609Finding Feature Information 609

Prerequisites for IPv6 Support on the Cisco ASR 901 Router 610

Restrictions for IPv6 Support on the Cisco ASR 901 Router 610

Information About IPv6 Support on the Cisco ASR 901 Router 611

Benefits 611

Overview of IPv6 611

IPv6 Address Formats 611

IPv6 Addressing and Discovery 612

Static Configuration 613

Stateless Autoconfiguration 613

ICMPv6 613

IPv6 Duplicate Address Detection 614

IPv6 Neighbor Discovery 614

IPv4 and IPv6 Dual-Stack on an Interface 614

Routing Protocols 615

IS-IS Enhancements for IPv6 615

OSPFv3 for IPv6 615

Multiprotocol BGP Extensions for IPv6 615

Bidirectional Forwarding Detection for IPv6 615

QoS for IPv6 616

How to Configure IPv6 Support on the Cisco ASR 901 Router 616

Configuring IPv6 Addressing and Enabling IPv6 Routing 616

Configuring a Static IPv6 Route 617

Enabling Stateless Auto-Configuration 619

Implementing IPv6 on VLAN Interfaces 619

Implementing IPv6 Addressing on Loopback Interfaces 620

Configuring ICMPv6 Rate Limiting 621

Configuring IPv6 Duplicate Address Detection 622

Configuring IPv6 Neighbor Discovery 623

Configuring IPv6 and IPv4 Dual-Stack on the Same VLAN 624

Configuring OSPFv3 for IPv6 625

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Configuring IS-IS for IPv6 626

Configuring Multiprotocol-BGP for IPv6 627

Configuring BFD for IPv6 628

Specifying a Static BFDv6 Neighbor628

Associating an IPv6 Static Route with a BFDv6 Neighbor 629

Configuring BFDv6 and OSPFv3 631

Configuring BFDv6 for BGP 632

Implementing QoS for IPv6 633

Verifying the Configuration of IPv6 Support on the Cisco ASR 901 Router 633

Verifying IPv6 Addressing Routing 633

Verifying a Static IPv6 Route 634

Verifying a Stateless Auto-Configuration 634

Verifying IPv6 Implementation on VLAN Interfaces 634

Verifying IPv6 Implementation on Loopback Interfaces 635

Verifying ICMPv6 Configuration 635

Verifying IPv6 Duplicate Address Detection Configuration 637

Verifying IPv6 Neighbor Discovery Configuration 637

Verifying IPv6 and IPv4 Dual-Stack Configuration 638

Verifying OSPFv3 for IPv6 Configuration 639

Verifying IS-IS for IPv6 Configuration 639

Verifying Multiprotocol-BGP for IPv6 Configuration 640Verifying BFD for IPv6 Configuration 641

Verifying BFDv6 and OSPFv3 Configuration 642

Verifying BFDv6 for BGP Configuration 642

Configuration Examples for IPv6 Support on the Cisco ASR 901 Cisco ASR 901S Router 643

Example: IPv6 Addressing on VLAN Interfaces 643

Example: IPv6 Addressing on Loopback Interfaces 643

Example: Customizing ICMPv6 643

Example: Configuring IPv6 Duplicate Address Detection 644

Example: Configuring IPv6 Neighborhood Discovery 644

Example: Enabling IPv6 Stateless Address Autoconfiguration 644

Example: Configuring the IPv4 and IPv6 Dual-Stack 644

Example: Configuring IPv6 Static Routing 645

Example: Configuring BFD and Static Routing for IPv6 645

Example: Configuring OSPFv3 for IPv6 645

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Example: Configuring BFD and OSPFv3 for IPv6 646

Example: Configuring IS-IS for IPv6 646

Example: Configuring Multiprotocol-BGP for IPv6 647

Example: Configuring BFD and Multiprotocol-BGP for IPv6648




Feature Information for IPv6 Support on the Cisco ASR 901 Router 651

C H A P T E R 3 3 Labeled BGP Support 657


Prerequisites for Labeled BGP Support 657

Restrictions for Labeled BGP Support 658

Overview of Labeled BGP Support 658

How to Configure Labeled BGP Support 658

Configuration Example for Labeled Support 659

Verifying Labeled BGP Support 660


Feature Information for Labeled BGP Support 663

C H A P T E R 3 4 MPLS Traffic Engineering - Fast Reroute Link Protection 665


Prerequisites for MPLS Traffic Engineering - Fast Reroute Link Protection 666

Restrictions for MPLS Traffic Engineering - Fast Reroute Link Protection 666

MPLS TE-FRR Link Protection Overview 667

BFD-triggered Fast Reroute 668

BFD 668

Fast Reroute 668

Link Protection 668

How to Configure Traffic Engineering - Fast Reroute Link Protection 668

Enabling MPLS TE-FRR on an SVI Interface 668

Enabling MPLS TE-FRR for EoMPLS on a Global Interface 669

Enabling MPLS TE-FRR for EoMPLS on an Interface 671

Enabling MPLS TE-FRR for IS-IS 672

Configuring Primary One-hop Auto-Tunnels 675

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Configuring Backup Auto-Tunnels 676

Enabling Targeted LDP session over Primary one-hop Auto-Tunnels 677

Enabling BFD Triggered FRR on an SVI Interface 678

Enabling BFD Triggered FRR on a Router679

Verification Examples 679

Verifying MPLS TE-FRR Configuration 679

Verifying Primary One-hop Auto-Tunnels 681

Verifying Backup Auto-Tunnels 682

Verifying BFD Triggered FRR Configuration 682


Example: Configuring MPLS TE-FRR 685

Example: Configuring Primary One-hop Auto-Tunnels 686

Example: Configuring Backup Auto-Tunnels 686

Example: Configuring BFD Triggered FRR 686


Feature Information for MPLS Traffic Engineering - Fast Reroute Link Protection 687

C H A P T E R 3 5 Layer 2 Control Protocol Peering, Forwarding, and Tunneling 689


Prerequisites for Layer 2 Control Protocol Peering, Forwarding, and Tunneling 690

Restrictions for Layer 2 Control Protocol Peering, Forwarding, and Tunneling 690

Layer 2 Control Protocol Forwarding 690

Layer 2 Control Protocol Tunneling 691

How to Configure Layer 2 Control Protocol Peering, Forwarding, and Tunneling 692

Configuring Layer 2 Peering 692

Configuring Layer 2 Forwarding 694

Configuring Layer 2 Tunneling 696

Verifying Layer 2 Peering 697

Verifying Layer 2 Forwarding 698

Verifying Layer 2 Tunneling 698


Example: Configuring Layer 2 Peering 699

Example: Configuring Layer 2 Forwarding 699

Example: Configuring Layer 2 Tunneling 700


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Feature Information for Layer 2 Control Protocol Peering, Forwarding, and Tunneling 703

C H A P T E R 3 6 Configuring Inverse Muliplexing over ATM 705

Finding Feature Information 705Prerequisites 705

Restrictions 706

Information About Inverse Muliplexing over ATM 706

How to Configure IMA 706

Configuring ATM IMA on T1/E1 Interface 706

Configuring ATM IMA over MPLS 708

Configuring the T1/E1 Controller 708

Configuring an ATM IMA Interface 709

Configuring ATM over MPLS Pseudowire Interface 710

Configuring a Port Mode Pseudowire 710

Configuring an N-to-1 VCC Cell Mode 711

Configuring an N-to-1 vPC Cell Mode 712

ATM AAL5 SDU VCC Transport 713

Verifying IMA Configurations 714

How to Configure ATM Class of Service 714

Configuring Constant Bit Rate 715

Configuring Unspecified Bit Rate 715

Configuring Unspecified Bit Rate Plus 716

Configuring Variable Bit Rate for Real/Non-Real Time Traffic 717


Example: Creating an IMA Interface 718

Example: Configuring a Port Mode Pseudowire 719

Example: Configuring an N-to-1 VCC Cell Mode 719

Example: Configuring an N-to-1 VPC Cell Mode 719

Example: Configuring CBR 719

Example: Configuring UBR 720

Example: Configuring UBR Plus 720

Example: Configuring VBR for Real Time Traffic 720

Example: Configuring VBR for Non-Real Time Traffic 720

Configuring Marking MPLS Experimental Bits 720

Creating a Policy-map for PVP/PVC/ATM IMA Interface 720

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Applying the Policy-map 721

Applying a Policy map on PVC and PVP 721

Applying a Policy map on ATM IMA Interface 723

Creating a Table-map724

Creating a Policy-map for SVI Interface 725

Applying a Service Policy on SVI Interface 726


Feature Information for Inverse Multiplexing over ATM 728

C H A P T E R 3 7 IPv6 over MPLS: 6PE and 6VPE 729


Prerequisites 730

Restrictions 730


Benefits of 6PE and 6VPE 731

IPv6 on Provider Edge Routers 731

IPv6 on VPN Provider Edge Routers 732

Components of MPLS-based 6VPE Network 732

Supported Features 733

Scalability Numbers 734

How to Configure IPv6 over MPLS: 6PE and 6VPE 734

Configuring 6PE 734

Configuring 6VPE 737

Setting up IPv6 Connectivity from PE to CE Routers 737

Setting up MP-BGP Peering to the Neighboring PE 738

Setting up MPLS/IPv4 Connectivity with LDP 739

Creating IPv6 VRFs on PE Routers 740

Configuring IPv6-only VRF 740

Configuring Dual-stack VRF 741

Verifying IPv6 over MPLS: 6PE and 6VPE Configuration 742


Example: Configuring 6PE 745

Example: Configuring 6VPE 746


Feature Information for IPv6 over MPLS: 6PE and 6VPE 748

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C H A P T E R 3 8 Storm Control 749


Prerequisites for Storm Control 749Restrictions for Storm Control 750

Information About Storm Control 750

Configuring Storm Control 750

Verifying Storm Control 752

Configuring Error Disable Recovery 752

Monitoring Error Disable Recovery 753

Configuration Example for Storm Control 754

Troubleshooting Tips for Storm Control 754


Feature Information for Storm Control 755

C H A P T E R 3 9 Remote Loop-Free Alternate - Fast Reroute 757


Prerequisites for Remote Loop-Free Alternate - Fast Reroute 757

Restrictions for Remote Loop-Free Alternate - Fast Reroute 758


Benefits of Remote LFA-FRR 760

Avoiding Traffic Drops 760

Pseudowire Redundancy over FRR 760

Conditions for Switchover 761

How to Configure Remote Loop-Free Alternate - Fast Reroute 761

Configuring Remote LFA-FRR for IS-IS 761

Configuring Remote LFA-FRR for OSPF 764

Configuring Remote LFA-FRR for Ethernet and TDM Pseudowires 767

Configuring Remote LFA-FRR on a Global Interface 767

Configuring Remote LFA-FRR on a GigabitEthernet Interface 768

Configuring Remote LFA-FRR on an SVI Interface 770

Configuring Remote LFA-FRR on IS-IS 771

Configuring LFA-FRR for EoMPLS 774

Configuring LFA-FRR for ATM/IMA 776

Configuring LFA-FRR for CESoPSN 778

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Configuring LFA-FRR for SAToP 780

Verification Examples for Remote LFA-FRR 782

Verifying Remote LFA-FRR Configuration 782

Verifying Remote LFA-FRR Configuration for EoMPLS on a GigabitEthernetInterface 784

Verifying Remote LFA-FRR Configuration for EoMPLS on an EVC Interface 785

Verifying Remote LFA-FRR Configuration on IS-IS 787

Verifying Remote LFA-FRR Configuration on ATM/IMA 787

Verifying Remote LFA-FRR Configuration on CESoPSN 787

Verifying Remote LFA-FRR Configuration on SAToP 788

Configuration Examples for Remote LFA-FRR 789

Example: Configuring Remote LFA-FRR for IS-IS 789

Example: Configuring Remote LFA-FRR for OSPF 789

Example: Configuring Remote LFA-FRR Globally 789

Example: Configuring Remote LFA-FRR on a GigabitEthernet Interface 790

Example: Configuring Remote LFA-FRR on an SVI Interface 790

Example: Configuring EoMPLS Pseudowire Redundancy over FRR 790

Example: Configuring LFA-FRR on ATM/IMA 790

Example: Configuring LFA-FRR on CESoPSN 791

Example: Configuring LFA-FRR on SAToP 791

Additional References 791Feature Information for Remote Loop-Free Alternate - Fast Reroute 793

C H A P T E R 4 0 Digital Optical Monitoring 795



How to Enable Transceiver Monitoring 796

Examples 797

Example: Displaying Transceiver Information 797

Example: Displaying Detailed Transceiver Information 797

Example: Displaying List of Supported Transceivers 798

Example: Displaying Threshold Tables 799

Example: Displaying Threshold Violations 801

Example: Displaying Threshold Violations on a Specific Interface 801

Example: When Transceiver Monitoring is Disabled 801

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Example: Displaying SFP Details 802


Feature Information for Digital Optical Monitoring 804

C H A P T E R 4 1 Autonomic Networking Infrastructure 805

Autonomic Networking 805


Prerequisites for Autonomic Networking 805

Restrictions for Autonomic Networking 806

Information About Autonomic Networking 806

Overview of Autonomic Networking 806

Autonomic Networking Infrastructure 807

New Device Joining the Autonomic Network 808

Working of the Registrar 809

Channel Discovery in Autonomic Networking 810

Service Discovery in Autonomic Networking 810

Autonomic Control Plane 810

IPsec on Link Local GRE IPv6 Tunnels in Autonomic Networking 810

How to Configure Autonomic Networking 811

Configuring the Registrar 811

Verifying and Monitoring Autonomic Networking Configuration 812

Additional References for Autonomic Networking 814

Feature Information for Autonomic Networking 814

C H A P T E R 4 2 IPv4 Multicast 817


Prerequisites for IPv4 Multicast 817

Restrictions for IPv4 Multicast 818

Information About IPv4 Multicast 818

Supported Protocols 819

PIM SSM for IPv4 819

Source Specific Multicast 819

Protocol Independent Multicast 819

PIM SSM Address Range 820

IGMP 820

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IGMPv1 820

IGMPv2 820

IGMPv3 820

IGMP Snooping821

IGMP Snooping Support 821

PIM SSM Mapping 822

Static SSM Mapping 822

Reverse Path Forwarding 822

IP Multicast VRF Lite 823

PIM BFD 823

Configuring IPv4 Multicast 824

Enabling IPv4 Multicast Routing 824

Configuring PIM SSM 825

Configuring PIM SSM Mapping 826

Configuring Multicast Receivers in VRF Interface 827

Configuring IGMP Snooping 827

Enabling IGMP Snooping Globally 828

Enabling IGMP Snooping on a VLAN 828

Configuring an IGMP Snooping Query 829

Disabling IGMP Snooping 831

Configuring IPv4 Multicast Routing for VRF Lite 832Enabling a VRF Under the VLAN Interface 833

Configuring PIM BFD on an IPv4 Interface 834

Verifying IPv4 Multicast Routing 835

Verifying PIM SSM 835

Verifying PIM SSM Mapping 836

Verifying Static Mroute 837

Verifying IGMP Snooping 838

Verifying IP Multicast Routing for VRF Lite 839

Verifying PIM BFD Support 842

Configuration Examples for IPv4 Multicast 843

Example: IPv4 Multicast Routing 843

Example: Configuring PIM SSM 843

Example: Configuring PIM SSM Mapping 843

Example: Configuring Rendezvous Point 844

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Example: Configuring Multicast Receivers in the VRF Interface 844

Example: Configuring IGMP Snooping 844

Example: Configuring IPv4 Multicast Routing for VRF Lite 845

Example: Configuring PIM BFD on an IPv4 Interface845



Feature Information for IPv4 Multicast 848

C H A P T E R 4 3 IPv6 Multicast 851


Prerequisites for IPv6 Multicast 851

Restrictions for IPv6 Multicast 852

Information About IPv6 Multicast 852

IPv6 Multicast Groups 853

IPv6 Multicast Routing Implementation 853

Multicast Listener Discovery Protocol for IPv6 853

MLD Snooping 854

MLD Snooping Support 855

Protocol Independent Multicast 855

PIM Source Specific Multicast 856

Source Specific Multicast Mapping for IPv6 856

PIM-Sparse Mode 856

Rendezvous Point 857

IPv6 Multicast VRF Lite 857

PIM BFD 857

Configuring IPv6 Multicast 858

Enabling IPv6 Multicast Routing 858

Disabling IPv6 Multicast Forwarding 858

Disabling MLD Device-Side Processing 859

Configuring MLD Protocol on an Interface 860

Configuring MLD Snooping 861

Enabling MLD Snooping Globally 862

Enabling MLD Snooping on a VLAN 862

Configuring a Static Multicast Group 863

Configuring a Multicast Router Port 864

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Enabling MLD Immediate Leave 865

Configuring an MLD Snooping Query 865

Disabling MLD Listener Message Suppression 867

Configuring a Rendezvous Point867

Configuring PIM SSM Options 867

Disabling PIM SSM Multicast on an Interface 868

Configuring IPv6 SSM Mapping 869

Configuring IPv6 Multicast Routing for VRF Lite 870

Enabling VRF Under a VLAN Interface 871

Configuring PIM BFD on an IPv6 Interface 872

Verifying IPv6 Multicast 873

Verifying MLD Snooping 881

Verifying IPv6 Multicast Routing for VRF Lite 884

Verifying PIM BFD Support 888

Configuration Examples for IPv6 Multicast 889

Example: Enabling IPv6 Multicast Routing 889

Example: Configuring IPv6 SSM Mapping 889

Example: Configuring IPv6 MLD Snooping 889

Example: Configuring Rendezvous Point 890

Example: Configuring IPv6 Multicast Routing for VRF Lite 890

Example: Configuring BFD PIM on an IPv6 Interface 891Troubleshooting Tips 892


Feature Information for IPv6 Multicast 894

C H A P T E R 4 4 Configuring Switched Port Analyzer 897


SPAN Limitations and Configuration Guidelines 897

Understanding SPAN 898

Overview 898

SPAN Session 899

Source Interface 899

Destination Interface 900

Traffic Types 900

SPAN Traffic 900

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Configuring SPAN 900

Creating a SPAN Session 900

Removing Sources or Destination from a SPAN Session 901

Configuration Examples for SPAN902

Verifying Local SPAN 902


Feature Information for Switched Port Analyzer 904

C H A P T E R 4 5 IP Security 905


Prerequisites for IP Security 906

Restrictions for IP Security 906

Information About IP Security 906

IKE Security Protocol 907

Advanced Encryption Standard 907

Triple DES Encryption 907

Encrypted Preshared Key 907

IKE Modes 907

Supported Components 908

Configuring IP Security 909

Creating a Preshared Key 909

Creating an ISAKMP Policy 910

Creating an ISAKMP Profile 911

Defining an IPsec Transform Set 912

Creating an IPsec Profile 913

Creating a VPN Tunnel Interface 914

Configuring Static Routing 915

Verifying Static Routing 916

Enabling Dynamic Routing 916

Verifying Dynamic Routing 917

Configuration Examples for IP Security 918

Example: Creating a Preshared Key 918

Example: Creating an ISAKMP Policy 918

Example: Creating an ISAKMP Profile 919

Example: Defining an IPsec Transform Set 919

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Example: Creating an IPsec Profile 919

Example: Creating a VPN Tunnel Interface 919

Example: Configuring Static Routing 920

Example: Enabling Dynamic Routing920

NAT Traversal 920

Restrictions for NAT Traversal 921

Information About NAT Traversal 921

Feature Design of IPsec NAT Traversal 921

IKE Phase 1 Negotiation NAT Detection 921

IKE Phase 2 Negotiation NAT Traversal Decision 922

UDP Encapsulation of IPsec Packets for NAT Traversal 922

Incompatibility Between IPsec ESP and PAT--Resolved 922

Incompatibility Between Checksums and NAT--Resolved 922

Incompatibility Between Fixed IKE Destination Ports and PAT--Resolved 922

UDP Encapsulated Process for Software Engines Transport Mode and Tunnel

Mode ESP Encapsulation 924

NAT Keepalives 924

How to Configure NAT and IPsec 924

Configuring NAT Traversal 924

Disabling NAT Traversal 924

Configuring NAT Keepalives 925Verifying IPsec Configuration 925

Configuration Examples for IPsec and NAT 926

NAT Keepalives Configuration Example 926


Related Documents 926

Standards 927

MIBs 927

RFCs 927

Technical Assistance 927

Feature Information for IP Security 927

C H A P T E R 4 6 BCP Support on MLPPP 929

BCP Support on MLPPP 929


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Prerequisites for BCP Support on MLPPP 929

Restrictions for BCP Support on MLPPP 930

Information About BCP Support on MLPPP 931

Supported Profiles and Protocols931

Quality of Service 931

Bridging and Routing 932

How to Configure BCP Support on MLPPP 932

Configuring Multiple EFPs Bridged Through the Same Link 932

Configuring an EFP 932

Adding an EFP to a Multilink 933

Enabling Routing on an MLPPP Interface Running BCP 934

Configuring Multiple Encapsulated VLANs Bridged Through Different Multilinks 936

Adding an Encapsulated VLAN to Multilinks 936

Configuring QoS for BCP Support on MLPPP 937

Defining a QoS Policy 937

Applying a QoS Policy on an MLPPP Interface 939

Verifying BCP Support on MLPPP 940

Configuration Examples for BCP Support on MLPPP 941

Example: Multilink with a Single EFP 941

Example: Multilink with Multiple EFPs 942

Example: Multilink with QoS 943Example: Multilink with Routing on an MLPPP Interface Running BCP 944

Example: Multilink Between Cisco ASR 901 Series Routers and Cisco C7600 Series

Routers 945

Example: Multilink with Maximum 10 Links 945



Standards 950

MIBs 950

RFCs 950


Feature Information for BCP Support on MLPPP 951

C H A P T E R 4 7 ITU-T G.8032 Ethernet Ring Protection Switching 953


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Prerequisites for Configuring ITU-T G.8032 Ethernet Ring Protection Switching 954

Restrictions for Configuring ITU-T G.8032 Ethernet Ring Protection Switching 954

Information About Configuring ITU-T G.8032 Ethernet Ring Protection Switching 954

G.8032 Overview954

ITU-T G.8032 Ethernet Ring Protection Switching Functionality 955

Single-Ring Topology 957

Multiple-Rings Topology 957

R-APS Control Messages 958

CFM Protocols and Link Failures 959

G.8032 Ring-Supported Commands and Functionality 959

G.8032 ERP Timers 960

Protection Switching Functionality in a Single Link Failure and Recovery 960

How to Configure ITU-T G.8032 Ethernet Ring Protection Switching 963

Configuring the Ethernet Ring Profile 963

Configuring an Ethernet Protection Ring 964

Configuring Topology Change Notification Propagation 967

Verifying Ethernet Ring Protection Configuration 967


Configuration Examples for ITU-T G.8032 Ethernet Ring Protection Switching 972

Example: Configuration for Ethernet Ring Protection 972

Additional References 973Related Documents 973

Standards 973

RFCs 973


Feature Information for Configuring ITU-T G.8032 Ethernet Ring Protection Switching 974

C H A P T E R 4 8 Configuring NAT for IP Address Conservation 977


Prerequisites for Configuring NAT for IP Address Conservation 978

Restrictions for Configuring NAT for IP Address Conservation 978

Information About Configuring NAT for IP Address Conservation 978

Overview 978

How NAT Works 979

Types of NAT 979

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NAT Inside and Outside Addresses 980

Static IP Address Support 980

Supported Components 980

How to Configure NAT for IP Address Conservation981

Configuring an Inside Source Address 981

Configuring Dynamic Translation of Inside Source Addresses Without Overload 982

Configuring Dynamic Translation of Inside Source Addresses with Overload 984

Configuring Static PAT 986

Verifying Configuration of NAT for IP Address Conservation 987

Configuration Examples for NAT for IP Address Conservation 988

Example: Configuring Inside Source Address 988

Example: Configuring Dynamic Translation of Inside Source Addresses Without Overload 988

Example: Configuring Dynamic Translation of Inside Source Addresses with Overload 988

Example: Configuring Static PAT 989



Standards 989

RFCs 989


Feature Information for Configuring NAT for IP Address Conservation 990

C H A P T E R 4 9 Auto-IP 991

Auto-IP 991

C H A P T E R 5 0 IPv6 Routing: OSPFv3 Authentication Support with IPsec 993


Prerequisites for IPv6 Routing: OSPFv3 Authentication Support with IPsec 993

Information About IPv6 Routing: OSPFv3 Authentication Support with IPsec 994

OSPFv3 Authentication Support with IPsec 994

How to Configure IPv6 Routing: OSPFv3 Authentication Support with IPsec 995

Configuring IPsec on OSPFv3 995

Defining Authentication on an Interface 995

Defining Authentication in an OSPFv3 Area 996

Configuration Examples for IPv6 Routing: OSPFv3 Authentication Support with IPsec 997

Example: Defining Authentication on an Interface 997

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Example: Defining Authentication in an OSPFv3 Area 997

Additional References for IPv6 Routing: OSPFv3 Authentication Support with IPsec 998

Feature Information for IPv6 Routing: OSPFv3 Authentication Support with IPsec 999

C H A P T E R 5 1 Policy-Based Routing 1001

Restrictions on the Policy-Based Routing 1002

How to Configure Policy-Based Routing 1002

Configuring ACLs 1002

Configuring Route-Map 1003

Configuring the IP Policy association (on SVI) 1004

Verifying the PBR Configuration 1005

Configuration Example for the Policy-Based Routing 1006


Feature Information for Policy-Based Routing 1007

C H A P T E R 5 2 Generic Routing Encapsulation 1009

IPv6 over IPv4 GRE Tunnels 1009

GRE Tunnel Keepalive 1010

QoS Tunnel Marking for GRE Tunnels 1010

Restrictions 1010

Configuring a GRE Tunnel 1011

Configuring a GRE Tunnel for IPv6 1012

Configuring VRF Lite over GRE Tunnel 1014

Configuring VRF-lite in Global Configuration Mode 1014

Configuring VRF-lite for IPv6 1015

Configuring VRF Lite in SVI Configuration Mode 1016

Configuring VRF Lite over GRE Tunnel 1016

Adding Static Route to the Tunnel 1017

Configuring GRE QoS Table Map Support 1017

Configuring Service-Policy 1018

Configuring a Table-Map 1019

Configuring a Policy-Map 1020

Associating Service Policy to the GRE Tunnel 1021

Verifying the GRE Configuration 1021

Configuration Examples for GRE 1023

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Configuration Example for IPv4 GRE 1023

Configuration Example for IPv6 GRE 1025


Feature Information for Generic Routing Encapsulation1029

C H A P T E R 5 3 Call Home 1031

Benefits of Using Call Home 1032

Obtaining Smart Call Home Services 1032

Anonymous Reporting 1033

How to Configure Call Home 1033

Prerequisites for Call Home 1033

Configuring Smart Call Home (Single Command) 1034

Enabling and Disabling Call Home 1034

Configuring Contact Information 1035

Configuring Destination Profiles 1036

Creating a New Destination Profile 1037

Copying a Destination Profile 1038

Setting Profiles to Anonymous Mode 1039

Subscribing to Alert Groups 1039

Periodic Notification 1041

Message Severity Threshold 1042

Configuring Snapshot Command List 1043

Configuring General email Options 1043

Specifying Rate Limit for Sending Call Home Messages 1045

Specifying HTTP Proxy Server 1045

Enabling AAA Authorization to Run IOS Commands for Call Home Messages 1046

Configuring Syslog Throttle 1046

Configuring Call Home Data Privacy 1047

Sending Call Home Communications Manually 1048

Sending a Call Home Test Message Manually 1048

Sending Call Home Alert Group Messages Manually 1048

Submitting Call Home Analysis and Report Requests 1049

Manually Sending Command Output Message for One Command or a Command List 1050

Configuring Diagnostic Signatures 1051

How to Configure Diagnostic Signatures 1055

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Configuring the Call Home Service for Diagnostic Signatures 1055

Configuring Diagnostic Signatures 1056

Displaying Call Home Configuration Information 1057

Default Settings1064

Alert Group Trigger Events and Commands 1064

Message Contents 1066

Sample Syslog Alert Notification in XML Format 1069

Configuration Example for Call Home 1070


Feature Information for Call Home 1072

C H A P T E R 5 4 PTP Debugging over GRE Tunnel 1073

Information About PTP Debugging over GRE Tunnel 1073

Prerequisites 1074

Restrictions 1074

Guidelines 1074

Configuring GRE Tunnel on Slave Device 1075

Configuring PTP Debugging over GRE Tunnel 1076

C H A P T E R 5 5 Overview 1077

Information About Smart Licensing 1077

Benefits 1078

Supported Software Models and PIDs 1078

How to Configure Cisco Smart Licensing 1079

Enabling Smart Licensing 1079

Registering the Device 1080

Authorizing the Device 1081

Verifying Smart Licensing Configuration 1081

Configuration Examples for Smart Licensing 1085

Example: Smart Call Home 1087


Feature Information for Cisco Smart Licensing 1089

C H A P T E R 5 6 MAC Layer 2 Access Control Lists 1091

Prerequisites for MAC Layer 2 Access Control Lists 1091

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Restrictions for MAC Layer 2 Access Control Lists 1091

How to Configure MAC Layer 2 Access Control Lists 1092

Creating a Layer 2 ACL 1092

Configuring MAC Layer 2 ACL on an Interface1093

Configuration Examples for Layer 2 MAC Access Control Lists 1094

Verification of configuration 1094

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About This Guide

This section describes the objectives, audience, organization, and conventions of this software configuration

guide. It contains the following sections:

About This Guide, page xlix

Document Revision History, page xlix

Objectives, page lxix

Audience, page lxix

Organization, page lxix

Organization, page lxxiii

Conventions, page lxxvi

Related Documentation, page lxxvii

Obtaining Documentation and Submitting a Service Request, page lxxviii

About This GuideThis section describes the objectives, audience, organization, and conventions of this software configuration

guide. It contains the following sections:

Document Revision HistoryThe Document Revision History table records technical changes to this document.

Change SummaryDateDocumentNumber/Release

Initial version of the document.November

2011

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Port based licensing is applicable to gigabit ethernet ports only.

Ports 4 to 7 are enabled by default. For Copper and SFP ports,

you need to purchase separate licenses to enable them. Formore details see,Licensing.

SL-A901-B license supports VRF-Lite. For more details see,

Licensing.

The minimum time interval supported for BFD is 50 ms. For

more details, seeConfiguring BFD, on page 301.

Cisco ASR 901 supports MLPPP configuration. For more

details, seeConfiguring MLPPP, on page 533.

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Structure-Agnostic TDM over Packet (SAToP) is a

structure-agnostic protocol for transporting TDM using

pseudowires (PW). PW connections using SAToP are

supported.

SAToP pseudowire with UDP encapsulation is supported.

CESoPSN pseudowire with UDP encapsulation is supported.

QoS for CESoPSN over UDP and SAToP over UDPIP

DSCP and IP Precedence via service-policy, and Type of

Service (ToS) settings are supported in pseudowire class.

L2VPN Pseudowire Redundancy feature.

T1 Local SwitchingThis feature allows switching of Layer

2 data between two CEM interfaces on the same router.

IEEE 1588-2008 (PTPv2) Ordinary Clock (OC) Master Clock

mode is supported.

G.781 QL-enabled mode is supported for synchronization

clock selection to avoid timing loops in the network.

ESMCThis feature dynamically distributes clock-quality

across synchronous ethernet links and enables selection of the

best clock in the network.

Onboard Failure Logging (OBFL)OBFL provides a

mechanism to store hardware, software, and environment

related critical data in a non-volatile memory, such as flashEPROM or EEPROM on routers.

MAC Flap controlA MAC flap occurs when a switch

receives packets from two different interfaces, with the same

source MAC address. When a MAC flap occurs, Cisco ASR

901 does Err-Disabling in one of the ports that has flapping.

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CFM over EFP Interface with cross connect.

IPSLA Path Discovery

The LSP path discovery (LPD)

feature allows the IP SLA MPLS LSP to automaticallydiscover

all the active paths to the forwarding equivalence class (FEC),

and configure LSP ping and traceroute operations across

various paths between the provide edge (PE) devices.

Routed QinQPop 2 configuration is supported.

Port Based EoMPLSPort mode allows a frame coming into

an interface to be packed into an MPLS packet and transported

over the MPLS backbone to an egress interface. The entire

ethernet frame without the preamble or FCS is transported as

a single packet.

Rommon and MCU upgrade

Upgradable MCU and

ROMMON is bundled with the IOS image. Once the IOS

image is upgraded, both the MCU and the ROMMON images

also get upgraded.

T1.403 remote loopbackCisco ASR 901 accepts the remote

loopback (line and payload) initiated at the far end.

Layer3 VPN over REP/MST is supported.

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DHCP client on SVIThis feature allows you to configure

DHCP client on SVI interface.

HSRP/VRRPThis feature allows you to configure the Hot

Standby Router Protocol (HSRP) or Virtual Router

Redundancy Protocol (VRRP) protocol.

TWAMP ResponderThis feature allows you to deploy

TWAMP in a simplified network architecture, with the

control-client and the session-sender on one device and the

server and the session-reflector on another device.

Dying GaspThis feature allows you to send notifications

during power failure, link down, router reload and link

administratively down conditions.

Multihop BFD

This feature allows you to do subsecond

forwarding failure detection for a destination with more than

one hop and up to 255 hops.

Ethernet LoopbackThis feature allows you to use per-port

and per VLAN Ethernet loopback to test connectivity at initial

startup, to test throughput, and to test quality of service in both

directions.

LLDPThis feature allows the network devices to advertise

information about themselves to other devices in the network.

Bit Error Rate TestingThis feature allows you to test the

integrity of the physical layer. For more details, see Bit Error

Rate Testing.

IPv6 SupportThis feature supports Long Term Evolution

(LTE) rollouts that provides high-bandwidth data connection

for mobile wireless devices. Supports IPv6 addressing on

Switch Virtual Interface (SVI), Loopback, and Ethernet

interfaces.

Labeled BGP SupportThis feature describes how to add

label mapping information to the Border Gateway Protocol

(BGP) message that is used to distributethe routeon the Cisco

ASR 901 Series Aggregation Services Routers.

MPLS Traffic EngineeringThis feature describes the Fast

Reroute (FRR) link protection and Bidirectional ForwardingDetection (BFD)-triggered FRR feature of Multiprotocol Label

Switching (MPLS) traffic engineering (TE).

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IMAThis feature allows you to configure Inverse

Multiplexing over ATM (IMA).

TDM Local SwitchingThis feature allows you to configure

Time Division Multiplexing (TDM) local switching on the T1

or E1 mode.

LicensingThis feature allows you to view the list of licenses

available for the Cisco ASR 901 router. The 10gigUpgrade

and Gige4portflexi licenses are available from Cisco IOS

Release 15.2(2)SNH1 onwards.

EVCThe restrictions section of the Ethernet Virtual

Connections feature is updated.

L2PTThis feature allows tunneling of Ethernet protocol

frames across layer 2 switching domains.

ACL-based QoSProvides classification based on source and

destination. The current implementation of this feature supports

only named ACLs.

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IPv6 over MPLSEnables the service providers running an

MPLS/IPv4 infrastructure to offer IPv6 services without any

major changes in the infrastructure, see IPv6 over MPLS: 6PE

and 6VPE, on page 729.

Remote Loop-Free Alternateprovides local protection for

unicast traffic in pure IP and MPLS networks, seeRemote

Loop-Free Alternate - Fast Reroute, on page 757for more

information

MPLS over MLPPPAllows you to use labeled switch paths

(LSPs) over MLPPP links, seeConfiguring MLPPP, on page

533for more information

Zero Touch ProvisioningEnables the ASR 901 router to

auto configure itself, download an updated image, connect to

the network, and start the operation as soon as it is cabled and

powered up, seeManaging and Monitoring Network

Management Features, on page 33for more information.

Digital Optical MonitoringSupport for Digital Optical

Monitoring (DOM) for Gig Optics on ASR 901, see Managing

and Monitoring Network Management Features, on page 33

for more information.

LicensingSupport for Precision Time Protocol (PTP)

Boundary Clock (BC) is introduced on the ASR 901 routers.

ADVANCED TIMING(1588BC) license should be installed

to use the BC feature, seeLicensingfor more information.

1588V2 Boundary ClockSupports for Precision TimeProtocol (PTP) Boundary Clock (BC) is introduced on the

ASR 901 routers, seeConfiguring Clocking, on page 355for

more information.

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Configuring Y.1564 to Generate Ethernet TrafficY.1564 is

an Ethernet service activation or performance test methodology

for turning up, installing, and troubleshooting Ethernet-based

services. This test methodology allows for complete validation

of Ethernet service-level agreements (SLAs) in a single test.

Ethernet Synthetic Loss Measurement in Y.1731Allows to

measure the Frame Loss Ratio (FLR) in the network, that is,

the ratio of frames lost to frames sent, using synthetic frames.

EVC Default Encapsulation for QinQ and XconnectThis

feature matches and forwards all the ingress traffic on the port.

The default service instance on a port is configured using the

encapsulation default command.

Hot Standby Pseudowire Support for ATM and TDM Access

CircuitsImproves the availability of pseudowires by

detecting failures and handling them with minimal disruption

to the service. This feature allows the backup pseudowire to

be in a hot standby state, so that it can immediately take over

if the primary pseudowire fails.

Microwave ACM Signaling and EEM IntegrationEnables

the microwave radio transceivers to report link bandwidth

information to an upstream Ethernet switch and take action on

the signal degradation to provide optimal bandwidth.

Multi-UNI CFM MEPs in the Same VPNServices are

configured such that two or more bridge domains (BDs) are

used to achieve UNI isolation and backhauling towardsprovider edge (PE) device. Local MEPs (with up direction)

need to be configured on the UNIs (with the associated BDs)

to monitor the service backhaul connection.

OSPFv3 MIBsThe OSPFV3-MIB is supported from Cisco

IOS R