b_asr901-scg.pdf

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

Last Modified: November 17, 2014

Americas HeadquartersCisco Systems, Inc.170 West Tasman DriveSan Jose, CA 95134-1706USAhttp://www.cisco.comTel: 408 526-4000 800 553-NETS (6387)Fax: 408 527-0883

Text Part Number: OL-23826-11

C O N T E N T S

P r e f a c e About This Guide xliii

About This Guide xliii

Document Revision History xliii

Objectives lxi

Audience lxii

Organization lxii

Conventions lxv

Related Documentation lxvi

Obtaining Documentation and Submitting a Service Request lxvi

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

Introduction 2

Features 2

Performance Features 2

Management Options 2

Manageability Features 3

Security Features 4

Quality of Service and Class of Service Features 4

Layer 3 Features 5

Layer 3 VPN Services 5

Monitoring Features 5

C H A P T E R 2 Licensing 7

Finding Feature Information 7

Feature Overview 8

Licenses Supported on Cisco ASR 901 Router 8

License Types 11

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Image Level License 11

Features Supported 11

Feature Based License 12

Port Based/Mode License 12

1588BC License 13

Port or Interface Behavior 13

Port Based License 13

Example: When Port Based License is not Installed 13

Example: When Port Based License is Installed 14

10gigUpgrade License 14

Example: When 10gigUpgrade License is not Installed 15

Example: When 10gigUpgrade License is Installed 15

Flexi License 16

Example: When Flexi License is not Installed 16

Example: When Flexi License is Installed 16

1588BC License 17

Example: When 1588BC License is not Installed 17

Example: When 1588BC License is Installed 17

Removing the License 18

Generating the License 19

Installing the License 19

Changing the License 20

Verifying the License 20

Where to Go Next 21

Additional References 21

Feature Information for Licensing 22

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 28

Verifying the Cisco IOS Software Version 29

Configuring the Hostname and Password 29

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Verifying the Hostname and Password 30

C H A P T E R 4 Managing and Monitoring Network Management Features 31


Network Management Features for the Cisco ASR 901 32

Cisco Active Network Abstraction (ANA) 32

SNMP MIB Support 32

Cisco Networking Services (CNS) 32

How to Configure Network Management Features on Cisco ASR 901 32

Configuring SNMP Support 32

Configuring Remote Network Management 36

Enabling Cisco Networking Services (CNS) and Zero-Touch Deployment 38

Zero-Touch Deployment 38

Image Download 39

Configuring a DHCP Server 39

Configuring a TFTP Server 41

Creating a Bootstrap Configuration 41

Enabling a TFTP Server on the Edge Router 41

Configuring the Cisco Configuration Engine 41

Configuration Examples 42

Example: Configuring SNMP Support 42

Example: Configuring Remote Network Management 42

Example: Configuring a DHCP Server 43

Example: Zero-touch Deployment 43

Alarm Port Monitoring 43

External Alarm Port Monitoring 43

Enabling Alarms 44

Enabling Syslogs 45

Enabling SNMP Traps 46

Verifying Alarm Configuration 47

Where to Go Next 48


Feature Information for Monitoring and Managing the Cisco ASR 901 Router 49

C H A P T E R 5 Using the Command-Line Interface 51

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Understanding Command Modes 51

Understanding the Help System 53

Understanding Abbreviated Commands 54

Understanding no and default Forms of Commands 54

Understanding CLI Error Messages 54

Using Command History 55

Changing the Command History Buffer Size 55

Recalling Commands 56

Disabling the Command History Feature 56

Using Editing Features 56

Enabling and Disabling Editing Features 56

Editing Commands through Keystrokes 57

Editing Command Lines that Wrap 59

Searching and Filtering Output of show and more Commands 59

Accessing the CLI 60

Accessing the CLI through a Console Connection or through Telnet 60

Saving Configuration Changes 60

C H A P T E R 6 Software Upgrade 61

Selecting a Cisco IOS Image 61

Upgrading the Cisco IOS image 61

Auto Upgrading the MCU 64

Manually Upgrading the ROMMON 65

Auto Upgrade of ROMMON 66

C H A P T E R 7 Configuring Gigabit Ethernet Interfaces 67

Configuring the Interface 67

Setting the Speed and Duplex Mode 68

Enabling the Interface 69

Modifying MTU Size on the Interface 70

Verifying the MTU Size 71

MAC Flap Control 71

Configuring MAC FLap Control 72

Configuring a Combo Port 72

Verifying the Media Type 74

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C H A P T E R 8 Configuring Ethernet Virtual Connections 77


Supported EVC Features 78

Understanding EVC Features 78

Ethernet Virtual Connections 79

Service Instances and EFPs 79

Encapsulation 80

VLAN Counters 81

Bridge Domains 81

DHCP Client on Switch Virtual Interface 82

Split-Horizon 82

Rewrite Operations 82

DHCP Snooping with Option 82 on EVC 83

Configuring EFPs 84

Default EVC Configuration 84

Configuring VLAN Counters on SVI 84

Verifying VLAN Counters Configuration on SVI 85

Configuration Guidelines 85

Creating Service Instances 86

Configuring DHCP Snooping with Option-82 on EVC 87

Configuring Per-Port Rate Limit 88

Verifying DHCP Snooping with Option 82 on EVC 89

Example: Configuring DHCP Snooping with Option 82 on EVC 90

Configuration Examples of Supported Features 91

Example: Configuring a Service Instance 91

Example: Encapsulation Using a VLAN Range 91

Example: Configuring VLAN Counters on SVI 91

Example: Two Service Instances Joining the Same Bridge Domain 92

Example: Bridge Domains and VLAN Encapsulation 92

Example: Rewrite 92

Example: Split Horizon 92

How to Configure EVC Default Encapsulation 93

Configuring EVC Default Encapsulation with Bridge-Domain 93

Configuring EVC Default Encapsulation with Xconnect 94

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Verifying EVC Default Encapsulation with Bridge-Domain 95

Verifying EVC Default Encapsulation with Xconnect 95

Configuration Examples for EVC Default Encapsulation 96

Example: Configuring EVC Default Encapsulation with Bridge-Domain 96

Example: Configuring EVC Default Encapsulation with Xconnect 96

Configuring Other Features on EFPs 96

EFPs and EtherChannels 96

MAC Address Forwarding, Learning and Aging on EFPs 97

Disabling MAC Address Learning on an Interface or Bridge Domain 97

Example: Configuring EFP and EtherChannels 98

Verification 99

Configuring IEEE 802.1Q Tunneling using EFPs 100

Restrictions 100

802.1Q Tunneling (QinQ) 100

Example: Configuring IEEE 802.1Q Tunneling Using EFPs 102

Routed QinQ 103

Restrictions 103

Configuration Examples for Routed QinQ 103

Example: User to Network Interface 103

Example: Network to Network Interface/Core Router 103

Bridge Domain Routing 104

Restrictions 104

Example: Configuring Bridge-Domain Routing 104

How to Configure DHCP Client on SVI 104

Configuring DHCP Client on SVI 105

Verifying DHCP Client on SVI 106

Example: Configuring DHCP Client on SVI 106

EFPs and MAC Addresses 106

EFPs and MSTP 106

Monitoring EVC 107

Configuring Switchport to EVC Mapping 109

Example: Configuring Switchport to EVC Mapping 109

Troubleshooting DHCP Snooping with Option-82 on EVC 111


Feature Information for Configuring Ethernet Virtual Connections 112

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C H A P T E R 9 Configuring EtherChannels 115

Understanding How EtherChannels Work 115

EtherChannel Feature Overview 115

Understanding How EtherChannels Are Configured 116

EtherChannel Configuration Overview 116

Understanding Manual EtherChannel Configuration 116

Understanding IEEE 802.3ad LACP EtherChannel Configuration 116

Understanding Port-Channel Interfaces 118

Understanding Load Balancing 118

EtherChannel Configuration Guidelines and Restrictions 118

Configuring Etherchannels 119

Configuring Channel Groups 119

Configuring the LACP System Priority and System ID 120

Configuring the LACP Transmit Rate 121

Verifying the LACP Transmit Rate 122

Configuring EtherChannel Load Balancing 122

Modifying MTU Size on Port-Channel 123

Verifying the MTU Size on Port-Channel 124

EVC On Port-Channel 125

Restrictions for EVC EtherChannel 125

Configuring EVC on Port-Channel 125

Verifying the Configuration 126

Troubleshooting Scenarios for EVC on a Port-Channel 127

C H A P T E R 1 0 Configuring Ethernet OAM 129

Understanding Ethernet CFM 130

IP SLA Support for CFM 130

Configuring Ethernet CFM 130

Default Ethernet CFM Configuration 131

Ethernet CFM Configuration Restrictions and Guidelines 131

Configuring the CFM Domain 131

Configuring Multi-UNI CFM MEPs in the Same VPN 135

Configuration Examples for Multi-UNI CFM MEPs 138

Verification 139

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Configuring Ethernet CFM Crosscheck 140

Configuring Static Remote MEP 141

Configuring a Port MEP 142

CFM with Hardware Offloading for G.8032 144

Restrictions 144

Configuring CFM with Hardware Offloading for G.8032 145

Verifying the CFM Configuration with Hardware Offloading for G.8032 146

Configuration Examples for CFM with Hardware Offloading for G.8032 147

Configuring SNMP Traps 147

Configuring IP SLA CFM Operation 148

Manually Configuring an IP SLA CFM Probe or Jitter Operation 148

Configuring an IP SLA Operation with Endpoint Discovery 151

Configuring CFM over EFP with Cross Connect 153

Configuring CFM over EFP Interface with Cross Connect 153

Examples 155

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

Connect Tunnel 155

Examples 155

Verification 156

Configuring CFM with EVC Default Encapsulation 157

Verifying CFM with EVC Default Encapsulation 158

Example: Configuring CFM with EVC Default Encapsulation 159

Configuring Y.1731 Fault Management 159

Default Y.1731 Configuration 159

Configuring ETH-AIS 159

Configuring ETH-LCK 161

Managing and Displaying Ethernet CFM Information 164

Understanding the Ethernet OAM Protocol 166

OAM Features 167

Discovery 167

Link Monitoring 167

Remote Failure Indication 168

Remote Loopback 168

Cisco Vendor-Specific Extensions 168

OAMMessages 168

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Setting Up and Configuring Ethernet OAM 169

Default Ethernet OAM Configuration 169

Restrictions and Guidelines 169

Enabling Ethernet OAM on an Interface 170

Configuration Example 171

Enabling Ethernet OAM Remote Loopback 171

Configuring Ethernet OAM Link Monitoring 172

Configuring Ethernet OAM Remote Failure Indications 175

Configuring Ethernet OAM Templates 176


Displaying Ethernet OAM Protocol Information 179

Verifying Ethernet OAM Configuration 180

Understanding E-LMI 182

Restrictions 182

Configuring E-LMI 183

Default E-LMI Configuration 183

Enabling E-LMI 183

Displaying E-LMI Information 184

Understanding Ethernet Loopback 185

Configuring Ethernet Loopback 185

Restrictions 185

Enabling Ethernet Loopback 186


Configuring Y.1564 to Generate Ethernet Traffic 189

Configuring IP SLA for Traffic Generation 192


Example: Two-Way Measurement 195

Example: Traffic Generation Mode 196

C H A P T E R 1 1 ITU-T Y.1731 Performance Monitoring 199


Prerequisites for ITU-T Y.1731 Performance Monitoring 199

Restrictions for ITU-T Y.1731 Performance Monitoring 200

Information About ITU-T Y.1731 Performance Monitoring 200

Frame Delay and Frame-Delay Variation 201

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Frame Loss Ratio 202

On-Demand and Concurrent Operations 202

Supported Interfaces 203

Benefits of ITU-T Y.1731 Performance Monitoring 203

How to Configure ITU-T Y.1731 Performance Monitoring 204

Configuring Two-Way Delay Measurement 204

What to Do Next 206

Configuring Single-Ended Synthetic Loss Measurement 207

What to Do Next 211

Scheduling IP SLAs Operations 211

Verifying the Frame Delay and Synthetic Loss Measurement Configurations 212

Example: Verifying Sender MEP for a Two-Way Delay Measurement Operation 212

Example: Verifying Receiver MEP for a Two-Way Delay Measurement Operation 213

Example: Verifying Sender MEP for a Synthetic Loss Measurement Operation 213

Example: Verifying Ethernet CFM Performance Monitoring 214

Example: Verifying History for IP SLAs Operations 214

How to Configure IP SLAs Y.1731 On-Demand and Concurrent Operations 215

Configuring Direct On-Demand Operation on a Sender MEP 215

Configuring Referenced On-Demand Operation on a Sender MEP 216

Configuring IP SLAs Y.1731 Concurrent Operation on a Sender MEP 216

Configuration Examples for IP SLAs Y.1731 On-Demand Operations 217

Example: On-Demand Operation in Direct Mode 217

Example: On-Demand Operation in Referenced Mode 217


Feature Information for ITU-T Y.1731 Performance Monitoring 219

C H A P T E R 1 2 Configuring Resilient Ethernet Protocol 221

Understanding Resilient Ethernet Protocol 221

Overview 221

Restrictions 223

Link Integrity 223

Fast Convergence 224

VLAN Load Balancing (VLB) 224

Spanning Tree Interaction 226

REP Ports 226

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Configuring Resilient Ethernet Protocol 226

Default REP Configuration 227

REP Configuration Guidelines 227

Configuring the REP Administrative VLAN 228

Configuring REP Interfaces 230

Configuring REP as Dual Edge No-Neighbor Port 233

Cisco ASR 901 Dual Rep Edge No-Neighbor Topology Example 236

Setting up Manual Preemption for VLAN Load Balancing 238

Configuring SNMP Traps for REP 239

Monitoring REP 239

Configuration Examples for REP 240

Configuring the REP Administrative VLAN: Example 240

Configuring a REP Interface: Example 240

Setting up the Preemption for VLAN Load Balancing: Example 241

Configuring SNMP Traps for REP: Example 242

Monitoring the REP Configuration: Example 242

Cisco Cisco ASR 901 Topology Example 242

C H A P T E R 1 3 Configuring MST on EVC Bridge Domain 247

Overview of MST and STP 247

Overview of MST on EVC Bridge Domain 248

Restrictions and Guidelines 248

Configuring MST on EVC Bridge Domain 250

Configuration Example for MST on EVC Bridge Domain 251

Verification 252

Troubleshooting Tips 254

C H A P T E R 1 4 Multiprotocol Label Switching 257

Configuring Multiprotocol Label Switching 257

C H A P T E R 1 5 Configuring EoMPLS 259

Understanding EoMPLS 259

Restrictions for EoMPLS 260

Configuring EoMPLS 261

EoMPLS Configuration Example 262

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Configuring EVC Default Encapsulation with xconnect 263

Verifying EVC Default Encapsulation with xconnect 264

Configuration Example for EVC Default Encapsulation with Xconnect 264

Configuring Pseudowire Redundancy 265

Configuration Commands 265

Port-Based EoMPLS 266

Feature Information for Configuring EoMPLS 267

C H A P T E R 1 6 Configuring MPLS VPNs 269

Understanding MPLS VPNs 269

Configuring MPLS VPNs 270

Configuration Examples for MPLS VPN 270

C H A P T E R 1 7 Configuring MPLS OAM 277

Understanding MPLS OAM 277

LSP Ping 277

LSP Traceroute 278

LSP Ping over Pseudowire 278

Configuring MPLS OAM 278

Using LSP Ping for LDP IPv4 FEC 279

Using LSP Traceroute for LDP IPv4 FEC 279

Using LSP Ping for Pseudowire 279

Using LSP Traceroute over Pseudowire 280

Displaying AToM VCCV capabilities 280

280

C H A P T E R 1 8 Configuring Routing Protocols 281

Configuring Routing Protocols 281

Changing Default Hashing Algorithm for ECMP 282

C H A P T E R 1 9 Configuring Bidirectional Forwarding Detection 283

Understanding BFD 283

Configuring BFD 283

BFD Configuration Guidelines and Restrictions 283

Configuring BFD for OSPF 284

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Configuring BFD for OSPF on One of More Interfaces 284

Configuring BFD for OSPF on All Interfaces 285

Configuring BFD for BGP 285

Configuring BFD for IS-IS 286

Configuring BFD for IS-IS on a Single Interface 286

Configuring BFD for IS-IS for All Interfaces 287

Configuring BFD for Static Routes 288

Configuration Examples for BFD 289

BFD with OSPF on All Interfaces 289

BFD with OSPF on Individual Interfaces 290

BFD with BGP 290

BFD with IS-IS on All Interfaces 290

BFD with IS-IS on Individual Interfaces 291

BFD with Static Routes 291

C H A P T E R 2 0 Configuring T1/E1 Controllers 293

Configuring the Card Type 293

Configuring E1 Controllers 294

Support for Unframed E1 296

Configuring Support for Unframed E1 Controller 297

Configuring T1 Controllers 297

Verifying Support for Unframed E1 Controller 299

Troubleshooting Controllers 300

Troubleshooting E1 Controllers 300

Troubleshooting T1 Controllers 301

C H A P T E R 2 1 Configuring Pseudowire 303


Understanding Pseudowires 304

Structure-Agnostic TDM over Packet 304

Structure-Aware TDM Circuit Emulation Service over Packet-Switched Network 304

Transportation of Service Using Ethernet over MPLS 304

Limitations 305

Hot Standby Pseudowire Support for ATM/IMA 305

Configuring Pseudowire 305

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Configuring Pseudowire Classes 305

Configuring CEM Classes 307

Configuring a Backup Peer 309

Configuring Structure-Agnostic TDM over Packet 310

Configuring a SAToP Pseudowire with UDP Encapsulation 311

Configuring Circuit Emulation Service over Packet-Switched Network 314

Configuring a CESoPSN Pseudowire with UDP Encapsulation 315

QoS for CESoPSN over UDP and SAToP over UDP 317

Configuring Transportation of Service Using Ethernet over MPLS 318

Configuring L2VPN Pseudowire Redundancy 319

Example: Pseudowire Redundancy 322

Configuring Hot Standby Pseudowire Support for ATM/IMA 322

Configuring ATM/IMA Pseudowire Redundancy in PVC Mode 322

Configuring ATM/IMA Pseudowire Redundancy in PVP Mode 324

Configuring ATM/IMA Pseudowire Redundancy in Port Mode 325

Verifying Hot Standby Pseudowire Support for ATM/IMA 326

TDM Local Switching 327

Restrictions 327

Configuring TDM Local Switching on a T1/E1 Mode 328

Verifying Local Switching 328

Configuration Example for Local Switching 329

Configuration Examples of Hot Standby Pseudowire Support for ATM/IMA 329

Example: Configuring ATM/IMA Pseudowire Redundancy in PVC Mode 329

Example: Configuring ATM/IMA Pseudowire Redundancy in PVP Mode 330

Example: Configuring ATM/IMA Pseudowire Redundancy in Port Mode 330

Configuration Examples for Pseudowire 330

Example: TDM over MPLS Configuration-Example 330

Example: CESoPSN with UDP 333

Example: Ethernet over MPLS 334


Feature Information for Configuring Pseudowire 335

C H A P T E R 2 2 Configuring Clocking 337

Configuring Clocking 337

Restrictions 337

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Configuring Network Clock for Cisco ASR 901 Router 338

Configuring Network Clock in Global Configuration Mode 338

Configuring Network Clock in Interface Configuration Mode 341

Understanding SSM and ESMC 341

Synchronization Status Message 342

Ethernet Synchronization Messaging Channel 342

Clock Selection Algorithm 342

ESMC behavior for Port Channels 343

ESMC behavior for STP Blocked Ports 343

Configuring ESMC in Global Configuration Mode 343

Configuring ESMC in Interface Configuration Mode 344

Verifying ESMC Configuration 345

Managing Synchronization 346

Synchronization Example 347

Configuring Synchronous Ethernet for Copper Ports 347

Verifying the Synchronous Ethernet configuration 348


Troubleshooting ESMC Configuration 352

Configuring PTP for the Cisco ASR 901 Router 352

Restrictions 353

Precision Time Protocol 353

IEEEV2 Best Master Clock Algorithm Overview 354

Information About Best Master Clock Algorithm 354

Setting System Time to Current Time 355

Configuring PTP Ordinary Clock 356

Configuring Master Ordinary Clock 356

Configuring Slave Ordinary Clock 358

Configuring PTP in Unicast Mode 361

Configuring PTP in Unicast Negotiation Mode 362

Configuring PTP in Multicast Mode 362

PTP Boundary Clock 364

Configuring PTP Boundary Clock 365

Verifying PTP modes 368

Verifying PTP Configuration on the 1588V2 Slave in Unicast Mode 371

Verifying PTP Configuration on the 1588V2 Slave in Multicast Mode 372

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Verifying PTP Configuration on the 1588V2 Master in Unicast Mode 374

Verifying PTP Configuration on the 1588V2 Master in Multicast Mode 375

PTP Hybrid Clock 378

Configuring a Hybrid Ordinary Clock 378

Configuring a Hybrid Boundary Clock 381

Verifying Hybrid modes 383

Configuration Examples for BMCA 384

Example: Configuring a Slave Ordinary Clock in BMCA 384

Example: Configuring a Boundary Clock in BMCA 384

SSM and PTP Interaction 385

ClockClass Mapping 385

Telecom Profiles 385

PTP Redundancy 385

Configuring Telecom Profile in Slave Ordinary Clock 386

Configuring Telecom Profile in Master Ordinary Clock 388

Verifying Telecom profile 389

Setting the TimeProperties 390

ASR 901 Negotiation Mechanism 391

Static Unicast Mode 391

VRF-Aware Precision Time Protocol 391

Configuring VRF-Aware Precision Time Protocol 391

Examples 394

Configuring ToD on 1588V2 Slave 394

1588v2 Phase Asymmetry Correction 395

Configuring Asymmetry Correction 397

Verifying 1588v2 Phase Asymmetry Correction 398

Example: Configuring 1588v2 Phase Asymmetry Correction 398


C H A P T E R 2 3 Cisco IOS IP SLA 401

Configuring IPSLA Path Discovery 401

Example for IPSLA Path Discovery 403

Two-Way Active Measurement Protocol 405

Configuring TWAMP 406

Configuring the TWAMP Server 406

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Configuring the TWAMP Reflector 407

Configuring the TWAMP Reflector 407

Configuration Examples for TWAMP 407

Example: Configuring the Router as an IP SLA TWAMP server 408

Example: Configuring the Router as an IP SLA TWAMP Reflector 408

C H A P T E R 2 4 Configuring QoS 409


Understanding QoS 410

Modular QoS CLI 411

Input and Output Policies 412

Input Policy Maps 413

Output Policy Maps 413

Access Control Lists 414

Restrictions 414

Classification 414

Class Maps 415

The match Command 416

Classification Based on Layer 2 CoS 416

Classification Based on IP Precedence 416

Classification Based on IP DSCP 417

Classification Comparisons 418

Classification Based on QoS Groups 420

Classification Based on VLAN IDs 421

Classification Based on ACL 422

Table Maps 422

Policing 423

Individual Policing 423


Unconditional Priority Policing 425

Egress Policing 426

Marking 426

Congestion Management and Scheduling 427

Traffic Shaping 428

Class-Based Shaping 428

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Port Shaping 429

Parent-Child Hierarchy 429

Class-Based Weighted Fair Queuing 430

Priority Queuing 431

Ingress and Egress QoS Functions 433

Configuring QoS 433

QoS Limitations 434

General QoS Limitations 434

Statistics Limitations 435

Propagation Limitations 435

Classification Limitations 435

Marking Limitations 437

Congestion Management Limitations 438

ACL-based QoS Restrictions 440

Improving Feature Scalability 441

TCAM with QoS 441

QoS for MPLS over MLPPP and IP over MLPPP 441

QoS for CPU-Generated Traffic 441

Egress Shaping on the MLPPP Interfaces 442

QoS Configuration Guidelines 442

Sample QoS Configuration 443

Configuring Classification 444

Creating a Class Map for Classifying Network Traffic 445

Creating a Policy Map for Applying a QoS Feature to Network Traffic 446

Attaching the Policy Map to an Interface 447

Attaching a Policy Map to a Cross-Connect EVC 448

Configuring Marking 449

Creating a Class Map for Marking Network Traffic 450

Creating a Policy Map for Applying a QoS Feature to Network Traffic 451

Attaching the Policy Map to an Interface 452

Configuring MPLS Exp Bit Marking using a Pseudowire 453


Configuring Congestion Management 454

Configuring Low Latency Queueing 454

Configuring Multiple Priority Queueing 455

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Configuring Class-Based Weighted Fair Queuing (CBFQ) 457

Weighted Random Early Detection (WRED) 458

Configuring Shaping 460

Configuring Class-Based Traffic Shaping in a Primary-Level (Parent) Policy Map 460

Configuring the Secondary-Level (Child) Policy Map 461

Configuring Ethernet Trusted Mode 462

Creating IP Extended ACLs 462

Using Class Maps to Define a Traffic Class 463

Creating a Named Access List 465

What to do Next 467

TCAM with ACL 467

Configuration Examples for ACL 467

Verifying Named Access List 468

Configuration Example for Named Access List 468

Access Control Lists for IPv6 Traffic Filtering 474

Creating and Configuring an IPv6 ACL for Traffic Filtering 474


Applying the IPv6 ACL to an Interface 476


QoS Treatment for Performance-Monitoring Protocols 476

Cisco IP-SLAs 476

QoS Treatment for IP-SLA Probes 477

Marking 477

Queuing 477

QoS Marking for CPU-Generated Traffic 477

QoS Queuing for CPU-Generated Traffic 478

Extending QoS for MLPPP 478

Configuring Class-map for Matching MPLS EXP Bits 478

Configuring Class-map for Matching IP DSCP Value 479

Configuring Class-map for Matching MPLS EXP Bits or IP DSCP Value 480

Configuring a Policy-map 481

Attaching the Policy-map to MLPPP Interface 484

Re-marking IP DSCP Values of CPU Generated Traffic 486

Re-marking MPLS EXP Values of CPU Generated Traffic 486

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Configuring a Policy-map to Match on CS5 and EXP4 487

Attaching the Policy-map to Match on CS5 and EXP4 to MLPPP Interface 489

Configuration Examples for Extending QoS for MPLS over MLPPP 490

Configuring Class-map for Matching MPLS EXP Bits 490

Configuring Class-map for Matching IP DSCP Value 490

Configuring Class-map for Matching MPLS EXP Bits or IP DSCP Value 490


Configuring a Policy-map to Match on CS5 and EXP 4 491

Attaching the Policy-map to MLPPP Interface 491

Configuring Egress Shaping on the MLPPP Interfaces 492

Configuring a Class-map 492

Configuring the Policy-map with Shaping 492

Attaching the Policy-map on the MLPPP Interface 493

Verifying the Egress Shaping over MLPPP Interface 494

Example: Configuring Egress Shaping over MLPPP Interface 495

Verifying MPLS over MLPPP Configuration 495

Configuration Guidelines 496

ARP-based Classification 497

Address Resolution Protocol Classification 497

Configuring ARP Classification 498

Configuring a Class-map 498

Verifying a Class-map 499


Verifying a Policy-map 499

Attaching a Policy-map 500

Example: Configuring ARP Classification 500



Feature Information for Configuring QoS 506

C H A P T E R 2 5 Configuring MLPPP 509


Prerequisites 510

Restrictions 510

MLPPP Optimization Features 510

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Distributed Multilink Point-to-Point Protocol Offload 511

Multiclass MLPPP 511

MPLS over MLPPP 512

MPLS Features Supported for MLPPP 512

MPLS over MLPPP on PE-to-CE Links 512

MPLS over MLPPP on Core Links 513

MPLS over MLPPP on CE to PE Links 513

Configuring MLPPP Backhaul 513

Configuring the Card Type, E1 and T1 Controllers 514

Configuring a Multilink Backhaul Interface 514

Creating a Multilink Bundle 514

Configuring MRRU 515

Configuring PFC and ACFC 516

Configuring PFC 516

Configuring ACFC 517

Enabling Multilink and Identifying the Multilink Interface 518

Configuring a Serial Interface as a Member Link of a MLPPP Group 520

MLPPP Offload 521

Configuring Additional MLPPP Settings 521

Configuring MPLS over the MLPPP on a Serial Interface 521

Configuring MPLS over MLPPP for OSPF 523

Configuration Examples for MPLS over MLPPP 525

Verifying MPLS over MLPPP Configuration 526


Feature Information for MLPPP 528

C H A P T E R 2 6 Onboard Failure Logging 529

Understanding OBFL 529

Configuring OBFL 530

Verifying OBFL Configuration 530

C H A P T E R 2 7 Hot Standby Router Protocol and Virtual Router Redundancy Protocol 533


Information About HSRP and VRRP 534

Overview of HSRP and VRRP 534

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Text Authentication 534

Preemption 534

How to Configure HSRP 535

Configuring HSRP 535

Configuration Examples for HSRP 536

Example: Configuring HSRP Active Router 536

Example: Configuring HSRP Backup Router 537

Example: HSRP Text Authentication 537

How to Configure VRRP 537

Configuring VRRP 538

Configuration Examples for VRRP 539

Example: Configuring a VRRP Master Router 539

Example: Configuring a VRRP Backup Router 540

Example: VRRP Text Authentication 540

Where to Go Next 540


Feature Information for HSRP and VRRP 541

C H A P T E R 2 8 Configuring Link Layer Discovery Protocol 543


Restrictions for LLDP 544

Overview of LLDP 544

How to Configure LLDP 544

Configuring LLDP 544

Verifying LLDP 546

Configuration Example for LLDP 546

Example: Enabling LLDP Globally 546

Example: Configuring Hold Time 546

Example: Configuring Delay Time 546

Example: Configuring Intervals 546

Where to go Next 547


Feature Information for LLDP 548

C H A P T E R 2 9 Configuring Multihop Bidirectional Forwarding Detection 549

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Contents


Restrictions for Multihop BFD 550

Information About Multihop BFD 550

Overview of Multihop BFD 550

How to Configure Multihop BFD 550

Configuring Multihop BFD Template 550

Configuring a Multihop BFD Map 551

Configuration Examples for Multihop BFD 552

Example : Configuring Multihop BFD 552



Feature Information for Multihop BFD 554

C H A P T E R 3 0 Bit Error Rate Testing 557


Prerequisites for BERT 557

Restrictions 558

Feature Overview 558

How to Configure BERT 559

Performing BERT on a T1/E1 Line 559

Terminating BERT on a T1/E1 Controller 560

Verifying BERT on a T1/E1 Controller 560



Feature Information for Bit Error Rate Testing 562

C H A P T E R 3 1 Microwave ACM Signaling and EEM Integration 563


Prerequisites for Microwave ACM Signaling and EEM Integration 564


Benefits 565

How to Configure Microwave ACM Signaling and EEM Integration 565

Configuring Connectivity Fault Management 566

Configuring EEP Applet Using CLIs 568

Configuring Event Handler 570

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Contents

Verifying Microwave Microwave ACM Signaling and EEM Integration Configuration 571

Configuration Examples for Microwave ACM Signaling and EEM Integration 572

Example: Configuring CFM 572

Example: Configuring EEP Applet 572

Example: Configuring Event Handler 575


Feature Information for Microwave ACM Signaling and EEM Integration 576

C H A P T E R 3 2 IPv6 Support on the Cisco ASR 901 Router 579


Prerequisites for IPv6 Support on the Cisco ASR 901 Router 580

Restrictions for IPv6 Support on the Cisco ASR 901 Router 580

Information About IPv6 Support on the Cisco ASR 901 Router 581

Benefits 581

Overview of IPv6 581

IPv6 Address Formats 581

IPv6 Addressing and Discovery 582

Static Configuration 583

Stateless Autoconfiguration 583

ICMPv6 583

IPv6 Duplicate Address Detection 584

IPv6 Neighbor Discovery 584

IPv4 and IPv6 Dual-Stack on an Interface 584

Routing Protocols 585

IS-IS Enhancements for IPv6 585

OSPFv3 for IPv6 585

Multiprotocol BGP Extensions for IPv6 585

Bidirectional Forwarding Detection for IPv6 585

QoS for IPv6 586

How to Configure IPv6 Support on the Cisco ASR 901 Router 586

Configuring IPv6 Addressing and Enabling IPv6 Routing 586

Configuring a Static IPv6 Route 587

Enabling Stateless Auto-Configuration 589

Implementing IPv6 on VLAN Interfaces 589

Implementing IPv6 Addressing on Loopback Interfaces 590

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Contents

Configuring ICMPv6 Rate Limiting 591

Configuring IPv6 Duplicate Address Detection 592

Configuring IPv6 Neighbor Discovery 593

Configuring IPv6 and IPv4 Dual-Stack on the Same VLAN 594

Configuring OSPFv3 for IPv6 595

Configuring IS-IS for IPv6 596

Configuring Multiprotocol-BGP for IPv6 597

Configuring BFD for IPv6 598

Specifying a Static BFDv6 Neighbor 598

Associating an IPv6 Static Route with a BFDv6 Neighbor 599

Configuring BFDv6 and OSPFv3 601

Configuring BFDv6 for BGP 602

Implementing QoS for IPv6 603

Verifying the Configuration of IPv6 Support on the Cisco ASR 901 Router 603

Verifying IPv6 Addressing Routing 603

Verifying a Static IPv6 Route 604

Verifying a Stateless Auto-Configuration 604

Verifying IPv6 Implementation on VLAN Interfaces 604

Verifying IPv6 Implementation on Loopback Interfaces 605

Verifying ICMPv6 Configuration 605

Verifying IPv6 Duplicate Address Detection Configuration 607

Verifying IPv6 Neighbor Discovery Configuration 607

Verifying IPv6 and IPv4 Dual-Stack Configuration 608

Verifying OSPFv3 for IPv6 Configuration 609

Verifying IS-IS for IPv6 Configuration 609

Verifying Multiprotocol-BGP for IPv6 Configuration 610

Verifying BFD for IPv6 Configuration 611

Verifying BFDv6 and OSPFv3 Configuration 612

Verifying BFDv6 for BGP Configuration 612

Configuration Examples for IPv6 Support on the Cisco ASR 901 Router 613

Example: IPv6 Addressing on VLAN Interfaces 613

Example: IPv6 Addressing on Loopback Interfaces 613

Example: Customizing ICMPv6 613

Example: Configuring IPv6 Duplicate Address Detection 614

Example: Configuring IPv6 Neighborhood Discovery 614

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Contents

Example: Enabling IPv6 Stateless Address Autoconfiguration 614

Example: Configuring the IPv4 and IPv6 Dual-Stack 614

Example: Configuring IPv6 Static Routing 615

Example: Configuring BFD and Static Routing for IPv6 615

Example: Configuring OSPFv3 for IPv6 615

Example: Configuring BFD and OSPFv3 for IPv6 616

Example: Configuring IS-IS for IPv6 616

Example: Configuring Multiprotocol-BGP for IPv6 617

Example: Configuring BFD and Multiprotocol-BGP for IPv6 618




Feature Information for IPv6 Support on the Cisco ASR 901 Router 621

C H A P T E R 3 3 Labeled BGP Support 627


Prerequisites for Labeled BGP Support 627

Restrictions for Labeled BGP Support 628

Overview of Labeled BGP Support 628

How to Configure Labeled BGP Support 628

Configuration Example for Labeled Support 629

Verifying Labeled BGP Support 630


Feature Information for Labeled BGP Support 633

C H A P T E R 3 4 MPLS Traffic Engineering - Fast Reroute Link Protection 635


Prerequisites for MPLS Traffic Engineering - Fast Reroute Link Protection 636

Restrictions for MPLS Traffic Engineering - Fast Reroute Link Protection 636

MPLS TE-FRR Link Protection Overview 637

BFD-triggered Fast Reroute 638

BFD 638

Fast Reroute 638

Link Protection 638

How to Configure Traffic Engineering - Fast Reroute Link Protection 638

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Contents

Enabling MPLS TE-FRR on an SVI Interface 638

Enabling MPLS TE-FRR for EoMPLS on a Global Interface 639

Enabling MPLS TE-FRR for EoMPLS on an Interface 641

Enabling MPLS TE-FRR for IS-IS 642

Configuring Primary One-hop Auto-Tunnels 645

Configuring Backup Auto-Tunnels 646

Enabling Targeted LDP session over Primary one-hop Auto-Tunnels 647

Enabling BFD Triggered FRR on an SVI Interface 648

Enabling BFD Triggered FRR on a Router 649

Verification Examples 649

Verifying MPLS TE-FRR Configuration 649

Verifying Primary One-hop Auto-Tunnels 651

Verifying Backup Auto-Tunnels 652

Verifying BFD Triggered FRR Configuration 652


Example: Configuring MPLS TE-FRR 655

Example: Configuring Primary One-hop Auto-Tunnels 656

Example: Configuring Backup Auto-Tunnels 656

Example: Configuring BFD Triggered FRR 656


Feature Information for MPLS Traffic Engineering - Fast Reroute Link Protection 657

C H A P T E R 3 5 Layer 2 Control Protocol Peering, Forwarding, and Tunneling 659


Prerequisites for Layer 2 Control Protocol Peering, Forwarding, and Tunneling 660

Restrictions for Layer 2 Control Protocol Peering, Forwarding, and Tunneling 660

Layer 2 Control Protocol Forwarding 660

Layer 2 Control Protocol Tunneling 661

How to Configure Layer 2 Control Protocol Peering, Forwarding, and Tunneling 662

Configuring Layer 2 Peering 662

Configuring Layer 2 Forwarding 664

Configuring Layer 2 Tunneling 666

Verifying Layer 2 Peering 667

Verifying Layer 2 Forwarding 668

Verifying Layer 2 Tunneling 668

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Contents


Example: Configuring Layer 2 Peering 669

Example: Configuring Layer 2 Forwarding 669

Example: Configuring Layer 2 Tunneling 670


Feature Information for Layer 2 Control Protocol Peering, Forwarding, and Tunneling 673

C H A P T E R 3 6 Configuring Inverse Muliplexing over ATM 675


Prerequisites 675

Restrictions 676

Information About Inverse Muliplexing over ATM 676

How to Configure IMA 676

Configuring ATM IMA on T1/E1 Interface 676

Configuring ATM IMA over MPLS 678

Configuring the T1/E1 Controller 678

Configuring an ATM IMA Interface 679

Configuring ATM over MPLS Pseudowire Interface 680

Configuring a Port Mode Pseudowire 680

Configuring an N-to-1 VCC Cell Mode 681

Configuring an N-to-1 vPC Cell Mode 682

ATM AAL5 SDU VCC Transport 683

Verifying IMA Configurations 684

How to Configure ATM Class of Service 684

Configuring Constant Bit Rate 685

Configuring Unspecified Bit Rate 685

Configuring Unspecified Bit Rate Plus 686

Configuring Variable Bit Rate for Real/Non-Real Time Traffic 687


Example: Creating an IMA Interface 688

Example: Configuring a Port Mode Pseudowire 689

Example: Configuring an N-to-1 VCC Cell Mode 689

Example: Configuring an N-to-1 VPC Cell Mode 689

Example: Configuring CBR 689

Example: Configuring UBR 690

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Contents

Example: Configuring UBR Plus 690

Example: Configuring VBR for Real Time Traffic 690

Example: Configuring VBR for Non-Real Time Traffic 690

Configuring Marking MPLS Experimental Bits 690

Creating a Policy-map for PVP/PVC/ATM IMA Interface 690

Applying the Policy-map 691

Applying a Policy map on PVC and PVP 691

Applying a Policy map on ATM IMA Interface 693

Creating a Table-map 694

Creating a Policy-map for SVI Interface 695

Applying a Service Policy on SVI Interface 696


Feature Information for Inverse Multiplexing over ATM 698

C H A P T E R 3 7 IPv6 over MPLS: 6PE and 6VPE 699


Prerequisites 700

Restrictions 700


Benefits of 6PE and 6VPE 701

IPv6 on Provider Edge Routers 701

IPv6 on VPN Provider Edge Routers 702

Components of MPLS-based 6VPE Network 702

Supported Features 703

Scalability Numbers 704

How to Configure IPv6 over MPLS: 6PE and 6VPE 704

Configuring 6PE 704

Configuring 6VPE 707

Setting up IPv6 Connectivity from PE to CE Routers 707

Setting up MP-BGP Peering to the Neighboring PE 708

Setting up MPLS/IPv4 Connectivity with LDP 709

Creating IPv6 VRFs on PE Routers 710

Configuring IPv6-only VRF 710

Configuring Dual-stack VRF 711

Verifying IPv6 over MPLS: 6PE and 6VPE Configuration 712

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Contents


Example: Configuring 6PE 715

Example: Configuring 6VPE 716


Feature Information for IPv6 over MPLS: 6PE and 6VPE 718

C H A P T E R 3 8 Storm Control 719


Prerequisites for Storm Control 719

Restrictions for Storm Control 720

Information About Storm Control 720

Configuring Storm Control 720

Verifying Storm Control 722

Configuring Error Disable Recovery 722

Monitoring Error Disable Recovery 723

Configuration Example for Storm Control 724

Troubleshooting Tips for Storm Control 724


Feature Information for Storm Control 725

C H A P T E R 3 9 Remote Loop-Free Alternate - Fast Reroute 727


Prerequisites for Remote Loop-Free Alternate - Fast Reroute 727

Restrictions for Remote Loop-Free Alternate - Fast Reroute 728


Benefits of Remote LFA-FRR 730

Avoiding Traffic Drops 730

Pseudowire Redundancy over FRR 730

Conditions for Switchover 731

How to Configure Remote Loop-Free Alternate - Fast Reroute 731

Configuring Remote LFA-FRR for IS-IS 731

Configuring Remote LFA-FRR for OSPF 734

Configuring Remote LFA-FRR for Ethernet and TDM Pseudowires 737

Configuring Remote LFA-FRR on a Global Interface 737

Configuring Remote LFA-FRR on a GigabitEthernet Interface 738

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Contents

Configuring Remote LFA-FRR on an SVI Interface 740

Configuring Remote LFA-FRR on IS-IS 741

Configuring LFA-FRR for EoMPLS 744

Configuring LFA-FRR for ATM/IMA 746

Configuring LFA-FRR for CESoPSN 748

Configuring LFA-FRR for SAToP 750

Verification Examples for Remote LFA-FRR 752

Verifying Remote LFA-FRR Configuration 752

Verifying Remote LFA-FRR Configuration for EoMPLS on a GigabitEthernet

Interface 754

Verifying Remote LFA-FRR Configuration for EoMPLS on an EVC Interface 755

Verifying Remote LFA-FRR Configuration on IS-IS 757

Verifying Remote LFA-FRR Configuration on ATM/IMA 757

Verifying Remote LFA-FRR Configuration on CESoPSN 757

Verifying Remote LFA-FRR Configuration on SAToP 758

Configuration Examples for Remote LFA-FRR 759

Example: Configuring Remote LFA-FRR for IS-IS 759

Example: Configuring Remote LFA-FRR for OSPF 759

Example: Configuring Remote LFA-FRR Globally 759

Example: Configuring Remote LFA-FRR on a GigabitEthernet Interface 760

Example: Configuring Remote LFA-FRR on an SVI Interface 760

Example: Configuring EoMPLS Pseudowire Redundancy over FRR 760

Example: Configuring LFA-FRR on ATM/IMA 760

Example: Configuring LFA-FRR on CESoPSN 761

Example: Configuring LFA-FRR on SAToP 761


Feature Information for Remote Loop-Free Alternate - Fast Reroute 762

C H A P T E R 4 0 Digital Optical Monitoring 765



How to Enable Transceiver Monitoring 766

Examples 767

Example: Displaying Transceiver Information 767

Example: Displaying Detailed Transceiver Information 767

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Contents

Example: Displaying List of Supported Transceivers 768

Example: Displaying Threshold Tables 769

Example: Displaying Threshold Violations 771

Example: Displaying Threshold Violations on a Specific Interface 771

Example: When Transceiver Monitoring is Disabled 771

Example: Displaying SFP Details 772


Feature Information for Digital Optical Monitoring 773

C H A P T E R 4 1 Autonomic Networking Infrastructure 775

Autonomic Networking 775


Prerequisites for Autonomic Networking 775

Restrictions for Autonomic Networking 776

Information About Autonomic Networking 776

Overview of Autonomic Networking 776

Autonomic Networking Infrastructure 777

New Device Joining the Autonomic Network 778

Working of the Registrar 779

Channel Discovery in Autonomic Networking 780

Service Discovery in Autonomic Networking 780

Autonomic Control Plane 780

IPsec on Link Local GRE IPv6 Tunnels in Autonomic Networking 780

How to Configure Autonomic Networking 781

Configuring the Registrar 781

Verifying and Monitoring Autonomic Networking Configuration 782

Configuration Examples for Autonomic Networking 784

Example: Configuring the Registrar 784

Additional References for Autonomic Networking 784

Feature Information for Autonomic Networking 784

C H A P T E R 4 2 IPv4 Multicast 785


Prerequisites for IPv4 Multicast 785

Restrictions for IPv4 Multicast 786

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Contents

Information About IPv4 Multicast 786

Supported Protocols 787

PIM SSM for IPv4 787

Source Specific Multicast 787

Protocol Independent Multicast 787

PIM SSM Address Range 788

IGMP 788

IGMPv1 788

IGMPv2 788

IGMPv3 788

IGMP Snooping 789

IGMP Snooping Support 789

PIM SSM Mapping 790

Static SSM Mapping 790

Reverse Path Forwarding 790

IP Multicast VRF Lite 791

PIM BFD 791

Configuring IPv4 Multicast 792

Enabling IPv4 Multicast Routing 792

Configuring PIM SSM 793

Configuring PIM SSM Mapping 794

Configuring Multicast Receivers in VRF Interface 795

Configuring IGMP Snooping 795

Enabling IGMP Snooping Globally 796

Enabling IGMP Snooping on a VLAN 796

Configuring an IGMP Snooping Query 797

Disabling IGMP Snooping 799

Configuring IPv4 Multicast Routing for VRF Lite 800

Enabling a VRF Under the VLAN Interface 801

Configuring PIM BFD on an IPv4 Interface 802

Verifying IPv4 Multicast Routing 803

Verifying PIM SSM 803

Verifying PIM SSM Mapping 804

Verifying Static Mroute 805

Verifying IGMP Snooping 806

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Contents

Verifying IP Multicast Routing for VRF Lite 807

Verifying PIM BFD Support 810

Configuration Examples for IPv4 Multicast 811

Example: IPv4 Multicast Routing 811

Example: Configuring PIM SSM 811

Example: Configuring PIM SSM Mapping 811

Example: Configuring Rendezvous Point 812

Example: Configuring Multicast Receivers in the VRF Interface 812

Example: Configuring IGMP Snooping 812

Example: Configuring IPv4 Multicast Routing for VRF Lite 813

Example: Configuring PIM BFD on an IPv4 Interface 813



Feature Information for IPv4 Multicast 816

C H A P T E R 4 3 IPv6 Multicast 819


Prerequisites for IPv6 Multicast 819

Restrictions for IPv6 Multicast 820

Information About IPv6 Multicast 820

IPv6 Multicast Groups 820

IPv6 Multicast Routing Implementation 821

Multicast Listener Discovery Protocol for IPv6 821

MLD Snooping 822

MLD Snooping Support 822

Protocol Independent Multicast 823

PIM Source Specific Multicast 824

Source Specific Multicast Mapping for IPv6 824

PIM-Sparse Mode 824

Rendezvous Point 824

IPv6 Multicast VRF Lite 825

PIM BFD 825

Configuring IPv6 Multicast 826

Enabling IPv6 Multicast Routing 826

Disabling IPv6 Multicast Forwarding 826

Cisco ASR 901 Series Aggregation Services Router Software Configuration Guidexxxvi OL-23826-11

Contents

Disabling MLD Device-Side Processing 827

Configuring MLD Protocol on an Interface 828

Configuring MLD Snooping 829

Enabling MLD Snooping Globally 830

Enabling MLD Snooping on a VLAN 830

Configuring a Static Multicast Group 831

Configuring a Multicast Router Port 832

Enabling MLD Immediate Leave 833

Configuring an MLD Snooping Query 833

Disabling MLD Listener Message Suppression 835

Configuring a Rendezvous Point 835

Configuring PIM SSM Options 835

Disabling PIM SSM Multicast on an Interface 836

Configuring IPv6 SSM Mapping 837

Configuring IPv6 Multicast Routing for VRF Lite 838

Enabling VRF Under a VLAN Interface 839

Configuring PIM BFD on an IPv6 Interface 840

Verifying IPv6 Multicast 841

Verifying MLD Snooping 849

Verifying IPv6 Multicast Routing for VRF Lite 852

Verifying PIM BFD Support 856

Configuration Examples for IPv6 Multicast 857

Example: Enabling IPv6 Multicast Routing 857

Example: Configuring IPv6 SSM Mapping 857

Example: Configuring IPv6 MLD Snooping 857

Example: Configuring Rendezvous Point 858

Example: Configuring IPv6 Multicast Routing for VRF Lite 858

Example: Configuring BFD PIM on an IPv6 Interface 859



Feature Information for IPv6 Multicast 861

C H A P T E R 4 4 Configuring Switched Port Analyzer 865


SPAN Limitations and Configuration Guidelines 865

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Contents

Understanding SPAN 866

Overview 866

SPAN Session 867

Source Interface 867

Destination Interface 868

Traffic Types 868

SPAN Traffic 868

Configuring SPAN 868

Creating a SPAN Session 868

Removing Sources or Destination from a SPAN Session 869

Configuration Examples for SPAN 870

Verifying Local SPAN 870


Feature Information for Switched Port Analyzer 872

C H A P T E R 4 5 IP Security 873


Prerequisites for IP Security 873

Restrictions for IP Security 874

Information About IP Security 874

IKE Security Protocol 874

Advanced Encryption Standard 875

Triple DES Encryption 875

Encrypted Preshared Key 875

IKE Modes 875

Supported Components 876

Configuring IP Security 877

Creating a Preshared Key 877

Creating an ISAKMP Policy 878

Creating an ISAKMP Profile 879

Defining an IPsec Transform Set 880

Creating an IPsec Profile 881

Creating a VPN Tunnel Interface 882

Configuring Static Routing 883

Verifying Static Routing 884

Cisco ASR 901 Series Aggregation Services Router Software Configuration Guidexxxviii OL-23826-11

Contents

Enabling Dynamic Routing 884

Verifying Dynamic Routing 885

Configuration Examples for IP Security 886

Example: Creating a Preshared Key 886

Example: Creating an ISAKMP Policy 886

Example: Creating an ISAKMP Profile 887

Example: Defining an IPsec Transform Set 887

Example: Creating an IPsec Profile 887

Example: Creating a VPN Tunnel Interface 887

Example: Configuring Static Routing 888

Example: Enabling Dynamic Routing 888


Related Documents 889

Standards 889

MIBs 889

RFCs 889

Technical Assistance 890

Feature Information for IP Security 890

C H A P T E R 4 6 BCP Support on MLPPP 891

BCP Support on MLPPP 891


Prerequisites for BCP Support on MLPPP 891

Restrictions for BCP Support on MLPPP 892

Information About BCP Support on MLPPP 893

Supported Profiles and Protocols 893

Quality of Service 893

Bridging and Routing 894

How to Configure BCP Support on MLPPP 894

Configuring Multiple EFPs Bridged Through the Same Link 894

Configuring an EFP 894

Adding an EFP to a Multilink 895

Enabling Routing on an MLPPP Interface Running BCP 896

Configuring Multiple Encapsulated VLANs Bridged Through Different Multilinks 898

Adding an Encapsulated VLAN to Multilinks 898

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Contents

Configuring QoS for BCP Support on MLPPP 899

Defining a QoS Policy 899

Applying a QoS Policy on an MLPPP Interface 901

Verifying BCP Support on MLPPP 902

Configuration Examples for BCP Support on MLPPP 903

Example: Multilink with a Single EFP 903

Example: Multilink with Multiple EFPs 904

Example: Multilink with QoS 905

Example: Multilink with Routing on an MLPPP Interface Running BCP 906

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

Routers 907

Example: Multilink with Maximum 10 Links 907



Standards 912

MIBs 912

RFCs 912


Feature Information for BCP Support on MLPPP 913

C H A P T E R 4 7 ITU-T G.8032 Ethernet Ring Protection Switching 915


Prerequisites for Configuring ITU-T G.8032 Ethernet Ring Protection Switching 916

Restrictions for Configuring ITU-T G.8032 Ethernet Ring Protection Switching 916

Information About Configuring ITU-T G.8032 Ethernet Ring Protection Switching 916

G.8032 Overview 916

ITU-T G.8032 Ethernet Ring Protection Switching Functionality 917

Single-Ring Topology 919

Multiple-Rings Topology 919

R-APS Control Messages 920

CFM Protocols and Link Failures 921

G.8032 Ring-Supported Commands and Functionality 921

G.8032 ERP Timers 922

Protection Switching Functionality in a Single Link Failure and Recovery 922

How to Configure ITU-T G.8032 Ethernet Ring Protection Switching 925

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Contents

Configuring the Ethernet Ring Profile 925

Configuring an Ethernet Protection Ring 926

Configuring Topology Change Notification Propagation 929

Verifying Ethernet Ring Protection Configuration 929


Configuration Examples for ITU-T G.8032 Ethernet Ring Protection Switching 934

Example: Configuration for Ethernet Ring Protection 934



Standards 935

RFCs 935


Feature Information for Configuring ITU-T G.8032 Ethernet Ring Protection Switching 936

C H A P T E R 4 8 Configuring NAT for IP Address Conservation 939


Prerequisites for Configuring NAT for IP Address Conservation 940

Restrictions for Configuring NAT for IP Address Conservation 940

Information About Configuring NAT for IP Address Conservation 940

Overview 940

How NAT Works 941

Types of NAT 941

NAT Inside and Outside Addresses 942

Static IP Address Support 942

Supported Components 942

How to Configure NAT for IP Address Conservation 943

Configuring an Inside Source Address 943

Configuring Dynamic Translation of Inside Source Addresses Without Overload 944

Configuring Dynamic Translation of Inside Source Addresses with Overload 946

Configuring Static PAT 948

Verifying Configuration of NAT for IP Address Conservation 949

Configuration Examples for NAT for IP Address Conservation 950

Example: Configuring Inside Source Address 950

Example: Configuring Dynamic Translation of Inside Source Addresses Without Overload 950

Example: Configuring Dynamic Translation of Inside Source Addresses with Overload 950

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Contents

Example: Configuring Static PAT 951



Standards 951

RFCs 951


Feature Information for Configuring NAT for IP Address Conservation 952

C H A P T E R 4 9 Auto-IP 953

Auto-IP 953

C H A P T E R 5 0 IPv6 Routing: OSPFv3 Authentication Support with IPsec 955


Prerequisites for IPv6 Routing: OSPFv3 Authentication Support with IPsec 955

Information About IPv6 Routing: OSPFv3 Authentication Support with IPsec 956

OSPFv3 Authentication Support with IPsec 956

How to Configure IPv6 Routing: OSPFv3 Authentication Support with IPsec 957

Configuring IPsec on OSPFv3 957

Defining Authentication on an Interface 957

Defining Authentication in an OSPFv3 Area 958

Configuration Examples for IPv6 Routing: OSPFv3 Authentication Support with IPsec 959

Example: Defining Authentication on an Interface 959

Example: Defining Authentication in an OSPFv3 Area 959

Additional References for IPv6 Routing: OSPFv3 Authentication Support with IPsec 960

Feature Information for IPv6 Routing: OSPFv3 Authentication Support with IPsec 961

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Contents

About This Guide

This section describes the objectives, audience, organization, and conventions of this software configurationguide. It contains the following sections:

About This Guide, page xliii

Document Revision History, page xliii

Objectives, page lxi

Audience, page lxii

Organization, page lxii

Conventions, page lxv

Related Documentation, page lxvi

Obtaining Documentation and Submitting a Service Request, page lxvi

About This GuideThis section describes the objectives, audience, organization, and conventions of this software configurationguide. 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.November2011

OL-23826-01

Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide OL-23826-11 xliii


Following are the updates specific to this release:

Cisco ASR 901 supports port based licensing. This type oflicense is applicable to gigabit ethernet ports only. Ports 4 to7 are enabled by default. For Copper and SFP ports, you needto purchase separate licenses to enable them. For more detailssee, Licensing.

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

The minimum time interval supported for BFD is 50 ms. Formore details, see Configuring BFD, on page 283.

Cisco ASR 901 supports MLPPP configuration. For moredetails, see Configuring MLPPP, on page 509.

January 2012OL-23826-02

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About This GuideDocument Revision History


Structure-Agnostic TDM over Packet (SAToP) is astructure-agnostic protocol for transporting TDM usingpseudowires (PW). PW connections using SAToP aresupported.

SAToP pseudowire with UDP encapsulation is supported.

CESoPSN pseudowire with UDP encapsulation is supported.

QoS for CESoPSN over UDP and SAToP over UDPIPDSCP and IP Precedence via service-policy, and Type ofService (ToS) settings are supported in pseudowire class.

L2VPN Pseudowire Redundancy feature.

T1 Local SwitchingThis feature allows switching of Layer2 data between two CEM interfaces on the same router.

IEEE 1588-2008 (PTPv2) Ordinary Clock (OC)Master Clockmode is supported.

G.781 QL-enabled mode is supported for synchronizationclock selection to avoid timing loops in the network.

ESMCThis feature dynamically distributes clock-qualityacross synchronous ethernet links and enables selection of thebest clock in the network.

Onboard Failure Logging (OBFL)OBFL provides amechanism to store hardware, software, and environmentrelated critical data in a non-volatile memory, such as flashEPROM or EEPROM on routers. Stored OBFL data can beretrieved in the event of a crash or failure.

MAC Flap controlA MAC flap occurs when a switchreceives packets from two different interfaces, with the samesource MAC address. When a MAC flap occurs, Cisco ASR901 does Err-Disabling in one of the ports that has flapping.

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CFM over EFP Interface with cross connect.

IPSLA Path DiscoveryThe LSP path discovery (LPD)feature allows the IP SLAMPLSLSP to automatically discoverall the active paths to the forwarding equivalence class (FEC),and configure LSP ping and traceroute operations acrossvarious paths between the provide edge (PE) devices.

Routed QinQPop 2 configuration is supported.

Port Based EoMPLSPort mode allows a frame coming intoan interface to be packed into anMPLS packet and transportedover the MPLS backbone to an egress interface. The entireethernet frame without the preamble or FCS is transported asa single packet.

Rommon and MCU upgradeUpgradable MCU andROMMON is bundled with the IOS image. Once the IOSimage is upgraded, both the MCU and the ROMMON imagesalso get upgraded.

T1.403 remote loopbackCisco ASR 901 accepts the remoteloopback (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 configureDHCP client on SVI interface.

HSRP/VRRPThis feature allows you to configure the HotStandby Router Protocol (HSRP) or Virtual RouterRedundancy Protocol (VRRP) protocol.

TWAMP ResponderThis feature allows you to deployTWAMP in a simplified network architecture, with thecontrol-client and the session-sender on one device and theserver and the session-reflector on another device.

Dying GaspThis feature allows you to send notificationsduring power failure, link down, router reload and linkadministratively down conditions.

Multihop BFDThis feature allows you to do subsecondforwarding failure detection for a destination with more thanone hop and up to 255 hops.

Ethernet LoopbackThis feature allows you to use per-portand per VLANEthernet loopback to test connectivity at initialstartup, to test throughput, and to test quality of service in bothdirections.

LLDPThis feature allows the network devices to advertiseinformation about themselves to other devices in the network.

Bit Error Rate TestingThis feature allows you to test theintegrity of the physical layer. For more details, see Bit ErrorRate Testing.

IPv6 SupportThis feature supports Long Term Evolution(LTE) rollouts that provides high-bandwidth data connectionfor mobile wireless devices. The Cisco ASR 901 routersupports IPv6 addressing on Switch Virtual Interface (SVI),Loopback, and Ethernet interfaces.

Labeled BGP SupportThis feature describes how to addlabel mapping information to the Border Gateway Protocol(BGP) message that is used to distribute the route on the CiscoASR 901 Series Aggregation Services Routers.

MPLS Traffic EngineeringThis feature describes the FastReroute (FRR) link protection and Bidirectional ForwardingDetection (BFD)-triggered FRR feature ofMultiprotocol LabelSwitching (MPLS) traffic engineering (TE).

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IMAThis feature allows you to configure InverseMultiplexing over ATM (IMA).

TDM Local SwitchingThis feature allows you to configureTime DivisionMultiplexing (TDM) local switching on the T1or E1 mode.

LicensingThis feature allows you to view the list of licensesavailable for the Cisco ASR 901 router. The 10gigUpgradeand Gige4portflexi licenses are available from Cisco IOSRelease 15.2(2)SNH1 onwards.

EVCThe restrictions section of the Ethernet VirtualConnections feature is updated.

L2PTThis feature allows tunneling of Ethernet protocolframes across layer 2 switching domains.

ACL-based QoSThe Access Control List (ACL) based Qosfeature provides classification based on source and destination.The current implementation of this feature supports only namedACLs.

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IPv6 over MPLSEnables the service providers running anMPLS/IPv4 infrastructure to offer IPv6 services without anymajor changes in the infrastructure, see IPv6 overMPLS: 6PEand 6VPE, on page 699.

Remote Loop-Free Alternateprovides local protection forunicast traffic in pure IP and MPLS networks, see RemoteLoop-Free Alternate - Fast Reroute, on page 727 for moreinformation

MPLS over MLPPPAllows you to use labeled switch paths(LSPs) over MLPPP links, see Configuring MLPPP, on page509 for more information

Zero Touch ProvisioningEnables the ASR 901 router toauto configure itself, download an updated image, connect tothe network, and start the operation as soon as it is cabled andpowered up, see Managing and Monitoring NetworkManagement Features, on page 31 for more information.

Digital Optical MonitoringSupport for Digital OpticalMonitoring (DOM) for Gig Optics on ASR 901, seeManagingand Monitoring Network Management Features, on page 31for more information.

C LicensingSupports for Precision Time Protocol (PTP)Boundary Clock (BC) is introduced on the ASR 901 routers.ADVANCED TIMING(1588BC) license should be installedto use the BC feature, see Licensing for more information.

1588V2 Boundary ClockSupports for Precision TimeProtocol (PTP) Boundary Clock (BC) is introduced on theASR 901 routers, see Configuring Clocking, on page 337 formore information.

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Configuring Y.1564 to Generate Ethernet TrafficY.1564 isan Ethernet service activation or performance test methodologyfor turning up, installing, and troubleshooting Ethernet-basedservices. This test methodology allows for complete validationof Ethernet service-level agreements (SLAs) in a single test.Using traffic generator performance profile, you can createthe traffic based on your requirements. The networkperformance like throughput, loss, and availability are analyzedusing Layer 2 traffic with various bandwidth profiles.

Ethernet Synthetic Loss Measurement in Y.1731Allows tomeasure the Frame Loss Ratio (FLR) in the network, that is,the ratio of frames lost to frames sent, using synthetic frames.

EVCDefault Encapsulation for QinQ andXconnectSupportsEVC default encapsulation on the Cisco ASR 901 router. Thisfeature matches and forwards all the ingress traffic on the port.The default service instance on a port is configured using theencapsulation default command.

Hot Standby Pseudowire Support for ATM and TDM AccessCircuitsImproves the availability of pseudowires bydetecting failures and handling them with minimal disruptionto the service. This feature allows the backup pseudowire tobe in a hot standby state, so that it can immediately take overif the primary pseudowire fails.

Microwave ACM Signaling and EEM IntegrationEnablesthe microwave radio transceivers to report link bandwidthinformation to an upstream Ethernet switch and take action onthe signal degradation to provide optimal bandwidth.

Multi-UNI CFM MEPs in the Same VPNServices areconfigured such that two or more bridge domains (BDs) areused 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 CiscoIOS Release 15.3(2)S onwards. ThisMIBmodule is for OSPFversion 3.

Remote Loop-FreeAlternate - Fast Reroute for EoMPLSTheRemote Loop-Free Alternate - Fast Reroute for EoMPLSfeature is introduced.

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TCAM in Cisco ASR 901 RouterEffective with Cisco IOSRelease 15.3(2)S, the Ternary Content Addressable Memory(TCAM) is allocated and deallocated dynamically, whichimproves both feature scalability and the efficiency of usageof TCAM.

Traffic Engineering - Fast Reroute for EoMPLSThe TrafficEngineering - Fast Reroute for EoMPLS feature is introduced.

Y.1731 Performance MonitoringProvides standards-basedEthernet performance monitoring as outlined in the ITU-TY-1731 specification and interpreted by the Metro EthernetForum (MEF).

Combo Port Media Type SelectStarting with Cisco IOSRelease 15.3(2)S, the Cisco ASR 901 router supports selectionof combo ports as the media type. A combo port is consideredas a single interface with dual front ends (an RJ-45 connectorand an SFP module connector).

ConfigurableMTU on Physical InterfaceStarting with CiscoIOS Release 15.3(2)S, the Cisco ASR 901 router supportsmodification of MTU size on physical interface.

Disabling MAC Address Learning on an Interface or BridgeDomainStarting with Cisco IOS Release 15.3(2)S, you cancontrol MAC address learning on an interface or VLAN tomanage the available MAC address table space by controllingwhich interfaces or VLANs can learn MAC addresses.

Layer 3 Ping in Customer EVCStarting with Cisco IOSRelease 15.3(2)S, pop 2 configuration is supported on layer 2and layer 3 operations. Additionally, it is supported onGigabitEthernet and port channel interfaces.

Sub-second Link OAM TimersStarting with Cisco IOSRelease 15.3(2)S, the Cisco ASR 901 router supportssub-second OAM timers.

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Autonomic NetworkingAutonomic networking is supportedfrom Cisco IOS Release 15.3(2)S onwards. It makes devicesmore intelligent and simplifies the interface between theoperator and Network Management System (NMS) system,by providing a strong abstraction across the network,distributed on each device. It also automatically provides allrelevant best practices, and keeps them up to date, without theneed for human intervention.

Storm ControlThe Storm Control feature prevents trafficon a LAN from being disrupted by a broadcast, multicast, orunknown unicast storm on one of a port.

Egress PolicingEgress policing can be classified based onQoS-groups, DSCP, and precedence value. For QoS-groupsto work at egress, you should map the traffic at ingress to aspecific QoS-group value.

MPLS Traffic Engineering (TE)Fast Reroute (FRR) LinkProtectionSupport for CESoPSN, SAToP, and ATM/IMAwas added from Cisco IOS Release 15.3(3)S onwards.

Multiaction Ingress Policer on EVCEffective with CiscoIOS Release 15.3(3)S, the Cisco ASR 901 supports policingingress traffic over the cross connect EVC, similar to bridgedomain service policy.

Y.1731 Performance MonitoringEffective with Cisco IOSRelease 15.3(3)S, the Cisco ASR 901 router supports ITU-TY.1731 performance monitoring on the following interfaces:

SLM support on the EVC cross connect

SLM support on the Port-Channel EVC cross connect

DMM and SLM support on the EVC BD for both the upand down MEPs

SLM support on the EVC cross connect for both the upand down MEPs

RFC 3107 Labeled BGP Support for TDM PseudowireTheRFC 3105 labeled BGP is supported for TDM pseudowirefrom Cisco IOS Release 15.3(3)S onwards.

Support for Digital Optical Monitoring (DOM) for 10 GigOpticsEffective with Cisco IOS Release 15.3(3)S, CiscoASR 901 supports DOM for both 1G and 10G SFPs.

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1588v2 Hybrid ClockTo improve the clock quality, you caneither improve the oscillator class or reduce the number ofhops between the master and the slave. In PTP hybrid mode,the oscillator class is improved by using a physical layer clock(sourced from a stratum-1 clock) instead of the availableinternal oscillator. The PTP hybrid mode is supported forordinary clock (in slave mode only) and boundary clock.

Dual REP Edge No-NeighborEffective with Cisco IOSrelease 15.4.(1)S, you can configure the non-REP switch facingports on a single device as dual edge no-neighbor ports. Theseports inherit all properties of edge ports, and overcome thelimitation of not converging quickly during a failure.

EoMPLS/TDMPseudowire Redundancy over FRREffectivewith Cisco IOS Release 15.4(1)S, support was added forEoMPLS/TDM pseudowire redundancy over FRR.

Ethernet loopback (NOSTG CLI and terminal loopback)Effective with Cisco IOS Release 15.4(1)S, the Cisco ASR901 supports internal loopback on Bridge-domain EFPs.

IPv4 MulticastDescribes how to configure IP multicast inan IPv4 network. IP multicast is an efficient way to usenetwork resources, especially for bandwidth-intensive servicessuch as audio and video.

IPv6MulticastDescribes how to configure basic IPmulticastin an IPv6 network.

Extending QoS over MLPPP InterfaceEffective with CiscoIOS Release 15.4(1)S, the QoS functionality on the MLPPPinterface is extended to support:

QoS for MPLS over MLPPP

QoS for CPU generated traffic

Redundant PTP instances as per G.8265.1PTP redundancyis an implementation on different clock nodes by which thePTP slave clock node interacts with multiple master ports suchas grandmaster, boundary clock nodes, and so on. A new servomode is defined under PTP to support high PDV scenarios(when the PDVs exceed G.8261 standard profiles).

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REP over LAGEffective with Cisco IOS Release 15.4(1)S,the Cisco ASR 901 supports REP over port-channel.

Switched Port Analyzer (SPAN)Effective with Cisco IOSRelease 15.4(1)S, the Cisco ASR 901 supports Local SPAN.Local SPAN supports a SPAN session entirely within oneswitch. You can analyze network traffic passing through portsor VLANs by using SPAN to send a copy of the traffic toanother port on the switch that has been connected to a networkanalyzer or other monitoring or security devices. SPAN copies(or mirrors) traffic received or sent (or both) on source portsto a destination port for analysis.

Y.1564 over EVC CrossConnectEffective with Cisco IOSrelease 15.4.(01)S, traffic can be generated over cross connectinterface. Figure 10-3 shows the Traffic Generator topologyover cross connect describing the traffic flow in the externaland internal modes.

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802.1ad for EVC Cross ConnectEffective with Cisco IOSrelease 15.4 (2) S, the Cisco ASR 901 Router supportsconfiguring EVC default encapsulation with xconnect.

ACL-based QoSEffective with Cisco IOS release 15.4 (2)S,the Cisco ASR 901 Router supports ACL-basedQoS on Layer4. This feature allows you to configure the layer 3 or layer 4options while configuring the ACL for QoS on ingress only.Layer 3 or layer 4 options like ToS, source port, and destinationport are supported.

Auto-IPEffective with Cisco IOS release 15.4 (2)S, theCisco ASR 901 Router supports Auto-IP feature. The auto-IPfeature automatically provides IP addresses to the nodesinserted into a ring. In ring topology, when a device is insertedinto the ring, the neighboring node interfaces require manualreconfiguration. The auto-IP feature addresses the problem ofmanually reconfiguring nodes during insertion, deletion, andmovement of nodes within the ring.

BCP Support on MLPPPThe BCP Support on MLPPPfeature enables forwarding of Ethernet frames over serialnetworks, and provides a high-speed extension of enterpriseLAN backbone traffic through a metropolitan area.

BGP -Accumulated IGPThe BGPAccumulated IGP featureis an optional nontransitive Border Gateway Protocol (BGP)path attribute. The attribute type code for the accumulatedinterior gateway protocol (AIGP) attribute is assigned by theInternet Assigned Numbers Authority (IANA). The value fieldof the AIGP attribute is defined as a set of type, length, value(TLV) elements. The AIGP TLV contains the AIGP metric.

G.8032 at Interface LevelThe ITU-T G.8032 Ethernet RingProtection Switching feature implements protection switchingmechanisms for Ethernet layer ring topologies. This featureuses the G.8032 Ethernet Ring Protection (ERP) protocol,defined in ITU-T G.8032, to provide protection for Ethernettraffic in a ring topology, while ensuring that no loops arewithin the ring at the Ethernet layer. The loops are preventedby blocking traffic on either a predetermined link or a failedlink.

IGMP SnoopingIGMP snooping allows a router to examineIGMP packets and make forwarding decisions based on theircontent. Using IGMP snooping, the router intercepts IGMPmessages from the host and updates its multicast tableaccordingly.

IP SecurityThe IP Security feature enables you to configure

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the Internet Key Exchange (IKE) protocol for basic IP Security(IPsec) Virtual Private Networks (VPNs). IKE is a keymanagement protocol standard that is used in conjunction withthe IPsec standard. IPsec is an IP security feature that providesrobust authentication and encryption of IP packets.

IPv6 Services: Extended Access Control ListsThe standardACL functionality in IPv6 is similar to standard ACLs in IPv4.Access lists determine what traffic is blocked and what trafficis forwarded at router interfaces and allow filtering based onsource and destination addresses and inbound interface. Eachaccess list has an implicit deny statement at the end. IPv6ACLsare defined and their deny and permit conditions are set usingthe ipv6 access-list command with the deny and permitkeywords in global configuration mode.

LicensingLicensing information about the new variants ofthe Cisco ASR 901 10G Router (A901-6CZ-FS-A andA901-6CZ-FS-D) is added to the licensing document.

MLD SnoopingMLD is a protocol used by IPv6 multicastrouters to discover the presence of multicast listeners (nodeslooking to receive IPv6 multicast packets) on its directlyattached links, and to discover which multicast packets are ofinterest to neighboring nodes.

Network Address TranslationEffective with Cisco IOSRelease 15.4(2)S, you can configure Network AddressTranslation (NAT) for IP address conservation. This modulealso provides information about the benefits of configuringNAT for IP address conservation.

TWAMP RFC ComplianceThe TWAMP RFC compliancefeature supports RFC 5357 which specifies a Two-Way ActiveMeasurement Protocol (TWAMP), based on the One-wayActive Measurement Protocol (OWAMP), that adds two-wayor round-trip measurement capabilities.

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feature based license

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