Cisco Catalyst 2960-L Series Switches Configuration Guide

Software Configuration Guide, Cisco IOS Release 15.2(5)E (Catalyst

2960-L Switches)

First Published: 2016-11-28

Americas Headquarters

Cisco Systems, Inc.

170 West Tasman Drive

San Jose, CA 95134-1706

USA

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Tel: 408 526-4000

800 553-NETS (6387)

Fax: 408 527-0883

CONTENTS

Preface xlix

PREFACE

Document Conventions xlix

Obtaining Documentation and Submitting a Service Request li

Using the Command-Line Interface 1

CHAPTER 1

Information About Using the Command-Line Interface 1

Command Modes 1

Understanding Abbreviated Commands 3

No and Default Forms of Commands 3

CLI Error Messages 3

Configuration Logging 4

Using the Help System 4

How to Use the CLI to Configure Features 5

Configuring the Command History 5

Changing the Command History Buffer Size 5

Recalling Commands 6

Disabling the Command History Feature 6

Enabling and Disabling Editing Features 7

Editing Commands Through Keystrokes 7

Editing Command Lines That Wrap 8

Searching and Filtering Output of show and more Commands 9

Accessing the CLI Through a Console Connection or Through Telnet 10

Accessing the CLI through Bluetooth 10

Interface and Hardware 11

PART I

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Configuring Interface Characteristics 13

CHAPTER 2

Finding Feature Information 13

Information About Configuring Interface Characteristics 13

Interface Types 13

Port-Based VLANs 13

Switch Ports 14

Routed Ports 15

Switch Virtual Interfaces 15

EtherChannel Port Groups 16

Power over Ethernet Ports 16

Using the Switch USB Ports 16

USB Mini-Type B Console Port 16

USB Type A Ports 17

Interface Connections 17

Interface Configuration Mode 18

Default Ethernet Interface Configuration 18

Interface Speed and Duplex Mode 19

Speed and Duplex Configuration Guidelines 19

IEEE 802.3x Flow Control 20

How to Configure Interface Characteristics 21

Configuring Interfaces 21

Adding a Description for an Interface 22

Configuring a Range of Interfaces 23

Configuring and Using Interface Range Macros 24

Configuring Ethernet Interfaces 26

Setting the Interface Speed and Duplex Parameters 26

Configuring IEEE 802.3x Flow Control 27

Shutting Down and Restarting the Interface 28

Configuring the Console Media Type 29

Configuring the USB Inactivity Timeout 30

Monitoring Interface Characteristics 31

Monitoring Interface Status 31

Clearing and Resetting Interfaces and Counters 32

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Configuration Examples for Interface Characteristics 32

Configuring a Range of Interfaces: Examples 32

Configuring and Using Interface Range Macros: Examples 33

Setting Interface Speed and Duplex Mode: Example 33

Configuring the Console Media Type: Example 33

Configuring the USB Inactivity Timeout: Example 34

Additional References for the Interface Characteristics Feature 35

Feature History and Information for Configuring Interface Characteristics 36

Configuring Auto-MDIX 37

CHAPTER 3

Prerequisites for Auto-MDIX 37

Restrictions for Auto-MDIX 37

Information about Configuring Auto-MDIX 37

Auto-MDIX on an Interface 37

How to Configure Auto-MDIX 38

Configuring Auto-MDIX on an Interface 38

Example for Configuring Auto-MDIX 39

Additional References 39

Feature History and Information for Auto-MDIX 40

Configuring System MTU 41

CHAPTER 4

Finding Feature Information 41

Information About the MTU 41

How to Configure MTU 41

Configuring the System MTU 41

Configuration Examples for System MTU 42

Configuring PoE 43

CHAPTER 5

Finding Feature Information 43

Information about PoE 43

Power over Ethernet Ports 43

Supported Protocols and Standards 43

Powered-Device Detection and Initial Power Allocation 44

Power Management Modes 45

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Persistent PoE 48

How to Configure PoE 49

Configuring a Power Management Mode on a PoE Port 49

Configuring Persistent PoE 50

Budgeting Power for Devices Connected to a PoE Port 51

Budgeting Power to All PoE ports 52

Budgeting Power to a Specific PoE Port 53

Configuring Power Policing 54

Monitoring Power Status 56

Configuration Examples for Configuring PoE 57

Budgeting Power: Example 57

Configuring EEE 59

CHAPTER 6

Restrictions for EEE 59

Information About EEE 59

EEE Overview 59

Default EEE Configuration 60

How to Configure EEE 60

Enabling or Disabling EEE 60

Monitoring EEE 61

Configuration Examples for Configuring EEE 62

Additional References 62

Feature History and Information for Configuring EEE 63

IP Multicast Snooping 65

PART II

Configuring IGMP Snooping 67

CHAPTER 7

Finding Feature Information 67

Prerequisites for Configuring IGMP Snooping 67

Prerequisites for IGMP Snooping 67

Restrictions for Configuring IGMP Snooping 68

Restrictions for IGMP Snooping 68

Information About IGMP Snooping 69

IGMP Snooping 69

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IGMP Versions 70

Joining a Multicast Group 70

Leaving a Multicast Group 71

Immediate Leave 72

IGMP Configurable-Leave Timer 72

IGMP Report Suppression 72

Default IGMP Snooping Configuration 73

IGMP Filtering and Throttling 73

Default IGMP Filtering and Throttling Configuration 74

How to Configure IGMP Snooping 75

Enabling or Disabling IGMP Snooping on a Switch 75

Enabling or Disabling IGMP Snooping on a VLAN Interface 76

Configuring a Multicast Router Port 77

Configuring a Host Statically to Join a Group 78

Enabling IGMP Immediate Leave 79

Configuring the IGMP Leave Timer 80

Configuring the IGMP Snooping Querier 82

Disabling IGMP Report Suppression 84

Configuring IGMP Profiles 85

Applying IGMP Profiles 87

Setting the Maximum Number of IGMP Groups 88

Configuring the IGMP Throttling Action 89

Monitoring IGMP Snooping 91

Monitoring IGMP Snooping Information 91

Monitoring IGMP Filtering 92

Configuration Examples for IGMP Snooping 93

Example: Enabling a Static Connection to a Multicast Router 93

Example: Configuring a Host Statically to Join a Group 93

Example: Enabling IGMP Immediate Leave 93

Example: Setting the IGMP Snooping Querier Source Address 93

Example: Setting the IGMP Snooping Querier Maximum Response Time 94

Example: Setting the IGMP Snooping Querier Timeout 94

Example: Setting the IGMP Snooping Querier Feature 94

Example: Configuring IGMP Profiles 94

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Example: Applying IGMP Profile 95

Example: Setting the Maximum Number of IGMP Groups 95

Additional References 95

Configuring MLD Snooping 97

CHAPTER 8

Finding Feature Information 97

Information About Configuring IPv6 MLD Snooping 97

Understanding MLD Snooping 97

MLD Messages 98

MLD Queries 98

Multicast Client Aging Robustness 99

Multicast Router Discovery 99

MLD Reports 99

MLD Done Messages and Immediate-Leave 100

Topology Change Notification Processing 100

How to Configure IPv6 MLD Snooping 100

Default MLD Snooping Configuration 100

MLD Snooping Configuration Guidelines 101

Enabling or Disabling MLD Snooping on the Switch (CLI) 102

Enabling or Disabling MLD Snooping on a VLAN (CLI) 102

Configuring a Static Multicast Group 103

Configuring a Multicast Router Port (CLI) 104

Enabling MLD Immediate Leave (CLI) 105

Configuring MLD Snooping Queries (CLI) 106

Disabling MLD Listener Message Suppression (CLI) 107

Displaying MLD Snooping Information 108

Configuration Examples for Configuring MLD Snooping 109

Configuring a Static Multicast Group: Example 109

Configuring a Multicast Router Port: Example 109

Enabling MLD Immediate Leave: Example 110

Configuring MLD Snooping Queries: Example 110

Layer 2 111

PART III

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Configuring Spanning Tree Protocol 113

CHAPTER 9

Finding Feature Information 113

Restrictions for STP 113

Information About Spanning Tree Protocol 114

Spanning Tree Protocol 114

Spanning-Tree Topology and BPDUs 115

Bridge ID, Device Priority, and Extended System ID 116

Port Priority Versus Path Cost 117

Spanning-Tree Interface States 117

How a Switch or Port Becomes the Root Switch or Root Port 120

Spanning Tree and Redundant Connectivity 120

Spanning-Tree Address Management 121

Accelerated Aging to Retain Connectivity 121

Spanning-Tree Modes and Protocols 121

Supported Spanning-Tree Instances 122

Spanning-Tree Interoperability and Backward Compatibility 122

STP and IEEE 802.1Q Trunks 123

VLAN-Bridge Spanning Tree 123

Default Spanning-Tree Configuration 124

How to Configure Spanning-Tree Features 124

Changing the Spanning-Tree Mode (CLI) 124

Disabling Spanning Tree 126

Configuring the Root Switch 127

Configuring a Secondary Root Device 128

Configuring Port Priority 129

Configuring Path Cost 130

Configuring the Device Priority of a VLAN 131

Configuring the Hello Time 132

Configuring the Forwarding-Delay Time for a VLAN 133

Configuring the Maximum-Aging Time for a VLAN 134

Configuring the Transmit Hold-Count 135

Monitoring Spanning-Tree Status 136

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Configuring Multiple Spanning-Tree Protocol 137

CHAPTER 10

Finding Feature Information 137

Prerequisites for MSTP 137

Restrictions for MSTP 138

Information About MSTP 139

MSTP Configuration 139

MSTP Configuration Guidelines 139

Root Switch 140

Multiple Spanning-Tree Regions 140

IST, CIST, and CST 141

Operations Within an MST Region 142

Operations Between MST Regions 142

IEEE 802.1s Terminology 142

Illustration of MST Regions 143

Hop Count 144

Boundary Ports 144

IEEE 802.1s Implementation 145

Port Role Naming Change 145

Interoperation Between Legacy and Standard Switches 146

Detecting Unidirectional Link Failure 146

Interoperability with IEEE 802.1D STP 147

RSTP Overview 147

Port Roles and the Active Topology 147

Rapid Convergence 148

Synchronization of Port Roles 149

Bridge Protocol Data Unit Format and Processing 150

Topology Changes 151

Protocol Migration Process 152

Default MSTP Configuration 152

About MST-to-PVST+ Interoperability (PVST+ Simulation) 153

About Detecting Unidirectional Link Failure 154

How to Configure MSTP Features 156

Specifying the MST Region Configuration and Enabling MSTP 156

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Configuring the Root Switch 158

Configuring a Secondary Root Switch 159

Configuring Port Priority 160

Configuring Path Cost 161

Configuring the Switch Priority 163

Configuring the Hello Time 164

Configuring the Forwarding-Delay Time 165

Configuring the Maximum-Aging Time 166

Configuring the Maximum-Hop Count 167

Specifying the Link Type to Ensure Rapid Transitions 167

Designating the Neighbor Type 169

Restarting the Protocol Migration Process 170

Configuring PVST+ Simulation 171

Enabling PVST+ Simulation on a Port 171

Examples 172

Examples: PVST+ Simulation 172

Examples: Detecting Unidirectional Link Failure 176

Monitoring MST Configuration and Status 176

Feature Information for MSTP 177

Configuring Optional Spanning-Tree Features 179

CHAPTER 11

Finding Feature Information 179

Restriction for Optional Spanning-Tree Features 179

Information About Optional Spanning-Tree Features 180

PortFast 180

BPDU Guard 180

BPDU Filtering 181

UplinkFast 181

BackboneFast 183

EtherChannel Guard 185

Root Guard 186

Loop Guard 187

STP PortFast Port Types 187

Bridge Assurance 188

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How to Configure Optional Spanning-Tree Features 190

Enabling PortFast 190

Enabling BPDU Guard 192

Enabling BPDU Filtering 193

Enabling UplinkFast for Use with Redundant Links 194

Disabling UplinkFast 195

Enabling BackboneFast 196

Enabling EtherChannel Guard 197

Enabling Root Guard 198

Enabling Loop Guard 199

Enabling PortFast Port Types 200

Configuring the Default Port State Globally 200

Configuring PortFast Edge on a Specified Interface 201

Configuring a PortFast Network Port on a Specified Interface 203

Enabling Bridge Assurance 204

Examples 205

Examples: Configuring PortFast Edge on a Specified Interface 205

Examples: Configuring a PortFast Network Port on a Specified Interface 205

Example: Configuring Bridge Assurance 206

Monitoring the Spanning-Tree Status 207

Feature Information for Optional Spanning-Tree Features 207

Configuring EtherChannels 209

CHAPTER 12

Finding Feature Information 209

Restrictions for EtherChannels 209

Information About EtherChannels 210

EtherChannel Overview 210

Channel Groups and Port-Channel Interfaces 210

Port Aggregation Protocol 211

PAgP Modes 212

PAgP Learn Method and Priority 213

PAgP Interaction with Other Features 214

Link Aggregation Control Protocol 214

LACP Modes 214

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LACP Interaction with Other Features 215

EtherChannel On Mode 215

Default EtherChannel Configuration 215

EtherChannel Configuration Guidelines 216

Layer 2 EtherChannel Configuration Guidelines 217

Auto-LAG 218

Auto-LAG Configuration Guidelines 219

How to Configure EtherChannels 219

Configuring Layer 2 EtherChannels 219

Configuring the PAgP Learn Method and Priority 222

Configuring LACP Hot-Standby Ports 223

Configuring the LACP System Priority 223

Configuring the LACP Port Priority 224

Configuring the LACP Port Channel Min-Links Feature 225

Configuring LACP Fast Rate Timer 226

Configuring Auto-LAG Globally 228

Configuring Auto-LAG on a Port Interface 228

Configuring Persistence with Auto-LAG 229

Monitoring EtherChannel, PAgP, and LACP Status 230

Configuration Examples for Configuring EtherChannels 231

Configuring Layer 2 EtherChannels: Examples 231

Configuring Auto LAG: Examples 232

Configuring LACP Port Channel Min-Links: Examples 233

Example: Configuring LACP Fast Rate Timer 233

Additional References for EtherChannels 234

Feature Information for EtherChannels 235

Configuring UniDirectional Link Detection 237

CHAPTER 13

Finding Feature Information 237

Restrictions for Configuring UDLD 237

Information About UDLD 238

Modes of Operation 238

Normal Mode 238

Aggressive Mode 238

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Methods to Detect Unidirectional Links 239

Neighbor Database Maintenance 239

Event-Driven Detection and Echoing 239

UDLD Reset Options 240

Default UDLD Configuration 240

How to Configure UDLD 240

Enabling UDLD Globally 240

Enabling UDLD on an Interface 242

Monitoring and Maintaining UDLD 243

Additional References for UDLD 243

Feature Information for UDLD 244

Network Management 245

PART IV

Configuring Cisco IOS Configuration Engine 247

CHAPTER 14

Prerequisites for Configuring the Configuration Engine 247

Restrictions for Configuring the Configuration Engine 247

Information About Configuring the Configuration Engine 248

Cisco Configuration Engine Software 248

Configuration Service 249

Event Service 249

NameSpace Mapper 249

Cisco Networking Services IDs and Device Hostnames 249

ConfigID 250

DeviceID 250

Hostname and DeviceID 250

Hostname, DeviceID, and ConfigID 250

Automated CNS Configuration 251

How to Configure the Configuration Engine 252

Enabling the CNS Event Agent 252

Refreshing DeviceIDs 253

Monitoring CNS Configurations 255

Additional References 256

Feature History and Information for the Configuration Engine 257

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Configuring the Cisco Discovery Protocol 259

CHAPTER 15

Finding Feature Information 259

Information About CDP 259

CDP Overview 259

Default CDP Configuration 260

How to Configure CDP 260

Configuring CDP Characteristics 260

Disabling CDP 262

Enabling CDP 263

Disabling Cisco Discovery Protocol on an Interface 264

Enabling Cisco Discovery Protocol on an Interface 265

Monitoring and Maintaining CDP 267

Additional References 268

Feature History and Information for Cisco Discovery Protocol 269

Configuring Simple Network Management Protocol 271

CHAPTER 16

Finding Feature Information 271

Prerequisites for SNMP 271

Restrictions for SNMP 273

Information About SNMP 274

SNMP Overview 274

SNMP Manager Functions 274

SNMP Agent Functions 274

SNMP Community Strings 275

SNMP MIB Variables Access 275

SNMP Notifications 276

SNMP ifIndex MIB Object Values 276

Default SNMP Configuration 277

SNMP Configuration Guidelines 277

How to Configure SNMP 278

Disabling the SNMP Agent 278

Configuring Community Strings 279

Configuring SNMP Groups and Users 282

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Configuring SNMP Notifications 285

Setting the Agent Contact and Location Information 290

Limiting TFTP Servers Used Through SNMP 291

Monitoring SNMP Status 292

SNMP Examples 293

Additional References 294

Feature History and Information for Simple Network Management Protocol 295

Configuring SPAN 297

CHAPTER 17

Finding Feature Information 297

Restrictions for SPAN 297

Information About SPAN 298

SPAN 298

Default SPAN Configuration 298

Configuration Guidelines 299

SPAN Configuration Guidelines 299

How to Configure SPAN 299

Creating a Local SPAN Session 299

Creating a Local SPAN Session and Configuring Incoming Traffic 301

Monitoring SPAN Operations 303

SPAN Configuration Examples 303

Example: Configuring Local SPAN 303

Additional References 304

Feature History and Information for SPAN 305

QoS 307

PART V

Configuring QoS 309

CHAPTER 18

Finding Feature Information 309

Prerequisites for QoS 309

General QoS Guidelines 309

Restrictions for QoS 310

Information About QoS 310

QoS Implementation 310

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Layer 2 Frame Prioritization Bits 311

Layer 3 Packet Prioritization Bits 311

QoS Basic Model 312

Actions at Ingress Port 312

Actions at Egress Port 312

Mapping Tables Overview 312

Queueing and Scheduling Overview 313

Queueing and Scheduling on Egress Queues 313

Packet Modification 316

Standard QoS Default Configuration 316

Default Egress Queue Configuration 316

DSCP Maps 317

Default CoS-to-DSCP Map 317

How to Configure QoS 318

Enabling QoS Globally 318

Configuring Egress Queue Characteristics 319

Configuration Guidelines 319

Mapping DSCP or CoS Values to an Egress Queue and to a Threshold ID 320

Configuring SRR Shaped Weights on Egress Queues 321

Configuring SRR Shared Weights on Egress Queues 323

Configuring the Egress Priority Queue 324

Limiting the Bandwidth on an Egress Interface 325

Enabling DSCP Transparency Mode 327

Configuring the Trust State on Ports Within the QoS Domain 328

Monitoring Standard QoS 330

Configuration Examples for QoS 330

Examples: Configuring Egress Queue Characteristics 330

Feature History and Information for QoS 331

Routing 333

PART VI

Configuring IP Unicast Routing 335

CHAPTER 19

Finding Feature Information 335

Information About Configuring IP Unicast Routing 335

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Information About IP Routing 335

Types of Routing 336

Static Unicast Routes 336

Default Routes and Networks 337

Routing Information Protocol 338

Summary Addresses and Split Horizon 338

Configuring IP Unicast Routing 338

Enabling IP Unicast Routing 339

Example: Enabling IP Unicast Routing 340

Assigning IP Addresses to SVIs 340

Example: Assigning IP Addresses to SVIs 341

Configuring Static Unicast Routes 341

Example: Configuring Static Unicast Routes 343

Configuring Default Routes and Networks 343

How to Configure RIP 344

Default RIP Configuration 344

Configuring Basic RIP Parameters 344

Configuring RIP Authentication 347

Configuring Summary Addresses and Split Horizon 348

Configuring Split Horizon 349

Example: Configuring Summary Addresses and Split Horizon 350

Example: Displaying Current Status of Routing Table 351

Monitoring and Maintaining the IP Network 351

Security 353

PART VII

Security Features Overview 355

CHAPTER 20

Security Features Overview 355

Preventing Unauthorized Access 359

CHAPTER 21

Preventing Unauthorized Access 359

Controlling Switch Access with Passwords and Privilege Levels 361

CHAPTER 22

Restrictions for Controlling Switch Access with Passwords and Privileges 361

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Information About Passwords and Privilege Levels 361

Default Password and Privilege Level Configuration 361

Additional Password Security 362

Password Recovery 362

Terminal Line Telnet Configuration 363

Username and Password Pairs 363

Privilege Levels 363

How to Control Switch Access with Passwords and Privilege Levels 364

Setting or Changing a Static Enable Password 364

Protecting Enable and Enable Secret Passwords with Encryption 365

Disabling Password Recovery 367

Setting a Telnet Password for a Terminal Line 368

Configuring Username and Password Pairs 369

Setting the Privilege Level for a Command 371

Changing the Default Privilege Level for Lines 372

Logging into and Exiting a Privilege Level 373

Monitoring Switch Access 373

Configuration Examples for Setting Passwords and Privilege Levels 374

Example: Setting or Changing a Static Enable Password 374

Example: Protecting Enable and Enable Secret Passwords with Encryption 374

Example: Setting a Telnet Password for a Terminal Line 374

Example: Setting the Privilege Level for a Command 374

Additional References 374

Configuring TACACS+ 377

CHAPTER 23

Finding Feature Information 377

Prerequisites for TACACS+ 377

Restrictions for TACACS+ 378

Information About TACACS+ 378

TACACS+ and Switch Access 378

TACACS+ Overview 379

TACACS+ Operation 380

Method List 380

TACACS AV Pairs 381

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TACACS Authentication and Authorization AV Pairs 381

TACACS Accounting AV Pairs 388

TACACS+ Configuration Options 400

TACACS+ Login Authentication 400

TACACS+ Authorization for Privileged EXEC Access and Network Services 400

TACACS+ Authentication 400

TACACS+ Authorization 401

TACACS+ Accounting 401

Default TACACS+ Configuration 401

How to Configure TACACS+ 401

Identifying the TACACS+ Server Host and Setting the Authentication Key 401

Configuring TACACS+ Login Authentication 402

Configuring TACACS+ Authorization for Privileged EXEC Access and Network Services 405

Starting TACACS+ Accounting 406

Establishing a Session with a Router if the AAA Server is Unreachable 408

Configuring Per VRF on a TACACS Server 408

Monitoring TACACS+ 410

Configuration Examples for TACACS+ 410

Example: TACACS Authorization 410

Example: TACACS Accounting 411

Example: TACACS Authentication 411

Example: Configuring Per VRF for TACACS Servers 413

Additional References for TACACS+ 414

Feature Information for TACACS+ 414

Configuring RADIUS 415

CHAPTER 24

Prerequisites for Configuring RADIUS 415

Restrictions for Configuring RADIUS 416

Information about RADIUS 416

RADIUS and Switch Access 416

RADIUS Overview 416

RADIUS Operation 417

Default RADIUS Configuration 418

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