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Software Configuration Guide, Cisco IOS Release 15.2(7)E (Catalyst
Digital Building Series Switches)
First Published: 2019-03-27
Americas Headquarters
Cisco Systems, Inc.
170 West Tasman Drive
San Jose, CA 95134-1706
USA
http://www.cisco.com
Tel: 408 526-4000
800 553-NETS (6387)
Fax: 408 527-0883
©Cisco Systems, Inc. All rights reserved.
CONTENTS
Preface liii
PREFACE
Document Conventions liii
Obtaining Documentation and Submitting a Service Request lv
Interface and Hardware 57
PART I
Configuring Interface Characteristics 1
CHAPTER 1
Information About Configuring Interface Characteristics 1
Interface Types 1
Port-Based VLANs 1
Switch Ports 2
Routed Ports 3
Switch Virtual Interfaces 3
EtherChannel Port Groups 4
Power over Ethernet Ports 4
Using the Switch USB Ports 4
USB Mini-Type B Console Port 4
USB Type A Ports 5
Interface Connections 5
Interface Configuration Mode 6
Default Ethernet Interface Configuration 7
Interface Speed and Duplex Mode 8
Speed and Duplex Configuration Guidelines 8
IEEE 802.3x Flow Control 9
How to Configure Interface Characteristics 10
Configuring Interfaces 10
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Adding a Description for an Interface 11
Configuring a Range of Interfaces 12
Configuring and Using Interface Range Macros 13
Configuring Ethernet Interfaces 15
Setting the Interface Speed and Duplex Parameters 15
Configuring IEEE 802.3x Flow Control 16
Shutting Down and Restarting the Interface 17
Configuring the Console Media Type 19
Configuring the USB Inactivity Timeout 20
Monitoring Interface Characteristics 21
Monitoring Interface Status 21
Clearing and Resetting Interfaces and Counters 22
Configuration Examples for Interface Characteristics 22
Configuring a Range of Interfaces: Examples 22
Configuring and Using Interface Range Macros: Examples 23
Setting Interface Speed and Duplex Mode: Example 23
Configuring the Console Media Type: Example 23
Configuring the USB Inactivity Timeout: Example 24
Additional References for the Interface Characteristics Feature 24
Feature History and Information for Configuring Interface Characteristics 25
Configuring Auto-MDIX 27
CHAPTER 2
Prerequisites for Auto-MDIX 27
Restrictions for Auto-MDIX 27
Information About Configuring Auto-MDIX 27
Auto-MDIX on an Interface 27
How to Configure Auto-MDIX 28
Configuring Auto-MDIX on an Interface 28
Example for Configuring Auto-MDIX 29
Additional References 30
Feature History and Information for Auto-MDIX 30
Configuring LLDP, LLDP-MED, and Wired Location Service 31
CHAPTER 3
Finding Feature Information 31
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Information About LLDP, LLDP-MED, and Wired Location Service 31
LLDP 31
LLDP Supported TLVs 32
LLDP and Cisco Medianet 32
LLDP-MED 32
LLDP-MED Supported TLVs 32
Default LLDP Configuration 33
Restrictions for LLDP 34
How to Configure LLDP, LLDP-MED, and Wired Location Service 34
Enabling LLDP 34
Configuring LLDP Characteristics 36
Configuring LLDP-MED TLVs 38
Configuring Network-Policy TLV 39
Configuration Examples for LLDP, LLDP-MED, and Wired Location Service 42
Configuring Network-Policy TLV: Examples 42
Monitoring and Maintaining LLDP, LLDP-MED, and Wired Location Service 42
Configuring System MTU 45
CHAPTER 4
Finding Feature Information 45
Information About the MTU 45
How to Configure MTU 45
Configuring the System MTU 45
Configuration Examples for System MTU 46
Configuring EEE 49
CHAPTER 5
Restrictions for EEE 49
Information About EEE 49
EEE Overview 49
Default EEE Configuration 50
How to Configure EEE 50
Enabling or Disabling EEE 50
Monitoring EEE 51
Configuration Examples for Configuring EEE 52
Additional References 52
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Feature History for Configuring EEE 52
IP Multicast Snooping 55
PART II
Configuring IGMP Snooping 57
CHAPTER 6
Finding Feature Information 57
Prerequisites for Configuring IGMP Snooping 57
Prerequisites for IGMP Snooping 57
Restrictions for Configuring IGMP Snooping 58
Restrictions for IGMP Snooping 58
Information About IGMP Snooping 59
IGMP Snooping 59
IGMP Versions 60
Joining a Multicast Group 60
Leaving a Multicast Group 62
Immediate Leave 62
IGMP Configurable-Leave Timer 62
IGMP Report Suppression 63
Default IGMP Snooping Configuration 63
IGMP Filtering and Throttling 64
Default IGMP Filtering and Throttling Configuration 64
How to Configure IGMP Snooping 65
Enabling or Disabling IGMP Snooping on a Device 65
Enabling or Disabling IGMP Snooping on a VLAN Interface 66
Setting the Snooping Method 67
Configuring a Multicast Router Port 69
Enabling IGMP Immediate Leave 70
Configuring the IGMP Leave Timer 71
Configuring TCN-Related Commands 73
Controlling the Multicast Flooding Time After a TCN Event 73
Recovering from Flood Mode 74
Disabling Multicast Flooding During a TCN Event 76
Configuring the IGMP Snooping Querier 77
Disabling IGMP Report Suppression 79
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Configuring IGMP Profiles 80
Applying IGMP Profiles 83
Setting the Maximum Number of IGMP Groups 84
Configuring the IGMP Throttling Action 85
Monitoring IGMP Snooping 87
Monitoring IGMP Snooping Information 87
Monitoring IGMP Filtering 88
Configuration Examples for IGMP Snooping 89
Example: Configuring IGMP Snooping Using CGMP Packets 89
Example: Enabling a Static Connection to a Multicast Router 89
Example: Enabling IGMP Immediate Leave 89
Example: Setting the IGMP Snooping Querier Source Address 89
Example: Setting the IGMP Snooping Querier Maximum Response Time 89
Example: Setting the IGMP Snooping Querier Timeout 90
Example: Setting the IGMP Snooping Querier Feature 90
Example: Configuring IGMP Profiles 90
Example: Applying IGMP Profile 90
Example: Setting the Maximum Number of IGMP Groups 91
Additional References 91
Feature History and Information for IGMP Snooping 92
Configuring MLD Snooping 93
CHAPTER 7
Finding Feature Information 93
Information About Configuring IPv6 MLD Snooping 93
Understanding MLD Snooping 93
MLD Messages 94
MLD Queries 94
Multicast Client Aging Robustness 95
Multicast Router Discovery 95
MLD Reports 95
MLD Done Messages and Immediate-Leave 96
Topology Change Notification Processing 96
How to Configure IPv6 MLD Snooping 96
Default MLD Snooping Configuration 96
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MLD Snooping Configuration Guidelines 97
Enabling or Disabling MLD Snooping on the Switch 98
Enabling or Disabling MLD Snooping on a VLAN 99
Configuring a Static Multicast Group 99
Enabling MLD Immediate Leave 100
Configuring MLD Snooping Queries 101
Disabling MLD Listener Message Suppression 103
Displaying MLD Snooping Information 103
Configuration Examples for Configuring MLD Snooping 104
Configuring a Static Multicast Group: Example 104
Configuring a Multicast Router Port: Example 104
Enabling MLD Immediate Leave: Example 105
Configuring MLD Snooping Queries: Example 105
IPv6 107
PART III
IPv6 Network Management 109
CHAPTER 8
Finding Feature Information 109
HTTP(S) IPv6 Support 109
Disabling HTTP Access to an IPv6 Device 109
Example: Disabling HTTP Access to the Device 110
Configuring IPv6 ACL 111
CHAPTER 9
Finding Feature Information 111
Information About Configuring IPv6 ACLs 111
Understanding IPv6 ACLs 111
Supported ACL Features 112
IPv6 ACL Limitations 112
Configuring IPv6 ACLs 112
Default IPv6 ACL Configuration 113
Interaction with Other Features and Switches 113
Creating IPv6 ACL 113
Applying an IPv6 ACL to an Interface 117
Displaying IPv6 ACLs 117
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Configuration Examples for IPv6 ACL 118
Example: Creating an IPv6 ACL 118
Example: Displaying IPv6 ACLs 118
IPv6 Embedded Management Components 121
CHAPTER 10
Finding Feature Information 121
Syslog 121
Configuring Syslog over IPv6 121
Example: Configuring Syslog over IPv6 122
SNMP over IPv6 123
CHAPTER 11
Finding Feature Information 123
SNMP over IPv6 123
SNMP over an IPv6 Transport 123
Configuring an SNMP Notification Server over IPv6 124
Examples: Configuring an SNMP Notification Server over IPv6 126
IPv6 Stateless Autoconfiguration 127
CHAPTER 12
Finding Feature Information 127
IPv6 Stateless Autoconfiguration 127
Simplified Network Renumbering for IPv6 Hosts 127
Configuring IPv6 Stateless Autoconfiguration 128
Example: Displaying IPv6 Interface Statistics 129
Layer 2 131
PART IV
Configuring Spanning Tree Protocol 133
CHAPTER 13
Finding Feature Information 133
Restrictions for STP 133
Information About Spanning Tree Protocol 134
Spanning Tree Protocol 134
Spanning-Tree Topology and BPDUs 135
Bridge ID, Device Priority, and Extended System ID 136
Port Priority Versus Path Cost 137
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Spanning-Tree Interface States 138
How a Device or Port Becomes the Root Device or Root Port 141
Spanning Tree and Redundant Connectivity 141
Spanning-Tree Address Management 142
Accelerated Aging to Retain Connectivity 142
Spanning-Tree Modes and Protocols 142
Supported Spanning-Tree Instances 143
Spanning-Tree Interoperability and Backward Compatibility 143
STP and IEEE 802.1Q Trunks 144
VLAN-Bridge Spanning Tree 144
Default Spanning-Tree Configuration 145
How to Configure Spanning-Tree Features 145
Changing the Spanning-Tree Mode (CLI) 145
Disabling Spanning Tree 147
Configuring the Root Device 148
Configuring a Secondary Root Device 149
Configuring Port Priority 150
Configuring Path Cost 152
Configuring the Device Priority of a VLAN 153
Configuring the Hello Time 154
Configuring the Forwarding-Delay Time for a VLAN 155
Configuring the Maximum-Aging Time for a VLAN 156
Configuring the Transmit Hold-Count 157
Monitoring Spanning-Tree Status 158
Configuring Multiple Spanning-Tree Protocol 159
CHAPTER 14
Finding Feature Information 159
Prerequisites for MSTP 159
Restrictions for MSTP 160
Information About MSTP 161
MSTP Configuration 161
MSTP Configuration Guidelines 161
Root Switch 162
Multiple Spanning-Tree Regions 162
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IST, CIST, and CST 163
Operations Within an MST Region 164
Operations Between MST Regions 164
IEEE 802.1s Terminology 164
Illustration of MST Regions 165
Hop Count 166
Boundary Ports 166
IEEE 802.1s Implementation 167
Port Role Naming Change 167
Interoperation Between Legacy and Standard Devices 167
Detecting Unidirectional Link Failure 168
Interoperability with IEEE 802.1D STP 168
RSTP Overview 169
Port Roles and the Active Topology 169
Rapid Convergence 170
Synchronization of Port Roles 171
Bridge Protocol Data Unit Format and Processing 172
Topology Changes 173
Protocol Migration Process 174
Default MSTP Configuration 174
About MST-to-PVST+ Interoperability (PVST+ Simulation) 175
About Detecting Unidirectional Link Failure 176
How to Configure MSTP Features 177
Specifying the MST Region Configuration and Enabling MSTP 177
Configuring the Root Device 180
Configuring a Secondary Root Device 181
Configuring Port Priority 182
Configuring Path Cost 184
Configuring the Device Priority 185
Configuring the Hello Time 187
Configuring the Forwarding-Delay Time 188
Configuring the Maximum-Aging Time 189
Configuring the Maximum-Hop Count 189
Specifying the Link Type to Ensure Rapid Transitions 190
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Designating the Neighbor Type 192
Restarting the Protocol Migration Process 193
Configuring PVST+ Simulation 194
Enabling PVST+ Simulation on a Port 195
Examples 196
Examples: PVST+ Simulation 196
Examples: Detecting Unidirectional Link Failure 200
Monitoring MST Configuration and Status 200
Feature Information for MSTP 201
Configuring Optional Spanning-Tree Features 203
CHAPTER 15
Finding Feature Information 203
Restriction for Optional Spanning-Tree Features 203
Information About Optional Spanning-Tree Features 204
PortFast 204
BPDU Guard 204
BPDU Filtering 205
UplinkFast 205
BackboneFast 207
EtherChannel Guard 209
Root Guard 210
Loop Guard 211
STP PortFast Port Types 211
Bridge Assurance 212
How to Configure Optional Spanning-Tree Features 214
Enabling PortFast 214
Enabling BPDU Guard 216
Enabling BPDU Filtering 217
Enabling UplinkFast for Use with Redundant Links 218
Disabling UplinkFast 220
Enabling BackboneFast 221
Enabling EtherChannel Guard 222
Enabling Root Guard 223
Enabling Loop Guard 224
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Enabling PortFast Port Types 225
Configuring the Default Port State Globally 226
Configuring PortFast Edge on a Specified Interface 227
Configuring a PortFast Network Port on a Specified Interface 228
Enabling Bridge Assurance 229
Examples 230
Examples: Configuring PortFast Edge on a Specified Interface 230
Examples: Configuring a PortFast Network Port on a Specified Interface 231
Example: Configuring Bridge Assurance 232
Monitoring the Spanning-Tree Status 233
Feature Information for Optional Spanning-Tree Features 233
Configuring Resilient Ethernet Protocol 235
CHAPTER 16
Finding Feature Information 235
Overview of Resilient Ethernet Protocol 235
Link Integrity 237
Fast Convergence 238
VLAN Load Balancing 238
Spanning Tree Interaction 239
REP Ports 240
How to Configure Resilient Ethernet Protocol 240
Default REP Configuration 240
REP Configuration Guidelines 240
Configuring REP Administrative VLAN 242
Configuring a REP Interface 243
Setting Manual Preemption for VLAN Load Balancing 247
Configuring SNMP Traps for REP 248
Monitoring Resilient Ethernet Protocol Configuration 248
Configuration Examples for Resilient Ethernet Protocol 250
Example: Configuring the REP Administrative VLAN 250
Example: Configuring a REP Interface 250
Additional References for Resilient Ethernet Protocol 252
Feature Information for Resilient Ethernet Protocol 252
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Configuring EtherChannels 255
CHAPTER 17
Finding Feature Information 255
Restrictions for EtherChannels 255
Information About EtherChannels 256
EtherChannel Overview 256
EtherChannel Modes 256
EtherChannel on Devices 257
EtherChannel Link Failover 258
Channel Groups and Port-Channel Interfaces 258
Port Aggregation Protocol 259
PAgP Modes 260
PAgP Learn Method and Priority 261
PAgP Interaction with Virtual Switches and Dual-Active Detection 261
PAgP Interaction with Other Features 262
Link Aggregation Control Protocol 262
LACP Modes 262
LACP Interaction with Other Features 263
EtherChannel On Mode 263
EtherChannel Load Deferral Overview 263
Default EtherChannel Configuration 264
EtherChannel Configuration Guidelines 265
Layer 2 EtherChannel Configuration Guidelines 266
Auto-LAG 267
Auto-LAG Configuration Guidelines 268
How to Configure EtherChannels 269
Configuring Layer 2 EtherChannels 269
Configuring Port Channel Load Deferral 271
Configuring the PAgP Learn Method and Priority 273
Configuring LACP Hot-Standby Ports 274
Configuring the LACP System Priority 275
Configuring the LACP Port Priority 276
Configuring the LACP Port Channel Min-Links Feature 277
Configuring LACP Fast Rate Timer 278
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Configuring Auto-LAG Globally 280
Configuring Auto-LAG on a Port Interface 281
Configuring Persistence with Auto-LAG 282
Monitoring EtherChannel, PAgP, and LACP Status 283
Configuration Examples for Configuring EtherChannels 283
Configuring Layer 2 EtherChannels: Examples 283
Example: Configuring Port Channel Load Deferral 284
Configuring Auto LAG: Examples 284
Configuring LACP Port Channel Min-Links: Examples 285
Example: Configuring LACP Fast Rate Timer 286
Additional References for EtherChannels 287
Feature Information for EtherChannels 288
Configuring the MAC Address-Table Move Update Feature 289
CHAPTER 18
Finding Feature Information 289
Information About MAC Address-Table Move Update 289
MAC Address-Table Move Update 289
MAC Address-Table Move Update Configuration Guidelines 291
How to Configure MAC Address-Table Move Update 291
Configuring MAC Address-Table Move Update 291
Configuring a Device to Obtain and Process MAC Address-Table Move Update Messages 292
Monitoring the MAC Address-Table Move Update 293
Configuration Examples for MAC Address-Table Move Update 293
Configuring the MAC Address-Table Move Update: Examples 293
Configuring UniDirectional Link Detection 295
CHAPTER 19
Finding Feature Information 295
Restrictions for Configuring UDLD 295
Information About UDLD 296
Modes of Operation 296
Normal Mode 296
Aggressive Mode 296
Methods to Detect Unidirectional Links 297
Neighbor Database Maintenance 297
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Event-Driven Detection and Echoing 297
UDLD Reset Options 298
Default UDLD Configuration 298
How to Configure UDLD 298
Enabling UDLD Globally 298
Enabling UDLD on an Interface 300
Monitoring and Maintaining UDLD 301
Additional References for UDLD 301
Feature Information for UDLD 302
Network Management 303
PART V
Configuring Cisco IOS Configuration Engine 305
CHAPTER 20
Prerequisites for Configuring the Configuration Engine 305
Restrictions for Configuring the Configuration Engine 305
Information About Configuring the Configuration Engine 306
Cisco Configuration Engine Software 306
Configuration Service 307
Event Service 307
NameSpace Mapper 308
Cisco Networking Services IDs and Device Hostnames 308
ConfigID 308
DeviceID 308
Hostname and DeviceID 309
Hostname, DeviceID, and ConfigID 309
Automated CNS Configuration 309
How to Configure the Configuration Engine 310
Enabling the CNS Event Agent 310
Refreshing DeviceIDs 312
Monitoring CNS Configurations 314
Additional References 315
Feature History and Information for the Configuration Engine 316
Configuring the Cisco Discovery Protocol 317
CHAPTER 21
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Finding Feature Information 317
Information About CDP 317
Cisco Discovery Protocol Overview 317
Default Cisco Discovery Protocol Configuration 318
How to Configure CDP 318
Configuring Cisco Discovery Protocol Characteristics 318
Disabling Cisco Discovery Protocol 320
Enabling Cisco Discovery Protocol 322
Disabling Cisco Discovery Protocol on an Interface 323
Enabling Cisco Discovery Protocol on an Interface 325
Monitoring and Maintaining Cisco Discovery Protocol 326
Additional References 327
Feature History and Information for Cisco Discovery Protocol 328
Configuring Simple Network Management Protocol 329
CHAPTER 22
Prerequisites for SNMP 329
Restrictions for SNMP 331
Information About SNMP 331
SNMP Overview 331
SNMP Manager Functions 332
SNMP Agent Functions 332
SNMP Community Strings 333
SNMP MIB Variables Access 333
SNMP Notifications 333
SNMP ifIndex MIB Object Values 334
Default SNMP Configuration 334
SNMP Configuration Guidelines 335
How to Configure SNMP 336
Disabling the SNMP Agent 336
Configuring Community Strings 337
Configuring SNMP Groups and Users 339
Configuring SNMP Notifications 342
Setting the Agent Contact and Location Information 347
Limiting TFTP Servers Used Through SNMP 348
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Monitoring SNMP Status 350
SNMP Examples 350
Additional References 351
Feature History and Information for Simple Network Management Protocol 352
Configuring SPAN 353
CHAPTER 23
Finding Feature Information 353
Restrictions for SPAN 353
Information About SPAN 354
SPAN 354
Local SPAN 354
SPAN Concepts and Terminology 355
SPAN Interaction with Other Features 358
Default SPAN Configuration 359
Configuration Guidelines 359
SPAN Configuration Guidelines 359
How to Configure SPAN 359
Creating a Local SPAN Session 359
Creating a Local SPAN Session and Configuring Incoming Traffic 361
Monitoring SPAN Operations 363
SPAN Configuration Examples 364
Example: Configuring Local SPAN 364
Examples: Creating an RSPAN VLAN 365
Feature History and Information for SPAN 366
Network Powered Lighting 367
PART VI
Configuring COAP Proxy Server 369
CHAPTER 24
Finding Feature Information 369
Information About the COAP Proxy Server 369
Restrictions for the COAP Proxy Server 370
How to Configure the COAP Proxy Server 370
Configuring the COAP Proxy 370
Configuring COAP Endpoints 373
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Monitoring COAP Proxy Server 374
Examples: Configuring the COAP Proxy Server 375
Configuring Auto SmartPorts 381
CHAPTER 25
Finding Feature Information 381
Information about Auto SmartPorts 381
Auto SmartPort Macros 382
Commands executed by CISCO_LIGHT_AUTO_SMARTPORT 382
Enabling Auto SmartPort 383
Configuring Mapping Between Event Triggers and Built-in Macros 384
Example: Enabling Auto SmartPorts 386
Example: Configuring Mapping Between Event Triggers and Built-in Macros 386
Configuring 2-event Classification 387
CHAPTER 26
Information about 2-event Classification 387
Configuring 2-event Classification 387
Example: Configuring 2-Event Classification 388
Configuring Power over Ethernet 389
CHAPTER 27
Finding Feature Information 389
Information About PoE 389
Power over Ethernet Ports 389
Supported Protocols and Standards 389
Powered-Device Detection and Initial Power Allocation 390
Power Management Modes 391
Fast POE 394
Perpetual POE 395
Cisco Universal Power Over Ethernet 395
Fast UPOE and Perpetual UPOE 395
Configuring Deep Sleep 395
How to Configure PoE 396
Configuring a Power Management Mode on a PoE Port 396
Configuring Power Policing 398
Configuring Fast PoE 400
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How to Configure Deep Sleep 401
Configuring the Switch to Enter Deep Sleep Mode 401
Configuring the Switch to Wake Up From Deep Sleep Mode 403
Monitoring Power Status 404
Configuration Examples for Configuring PoE 404
Budgeting Power: Example 404
Example: Configuring Perpetual PoE 405
Frequently Asked Questions 407
CHAPTER 28
Finding Feature Information 407
Frequently Asked Questions 407
EnergyWise 411
PART VII
Configuring EnergyWise 413
CHAPTER 29
Finding Feature Information 413
Prerequisites for Configuring EnergyWise 413
Prerequisites for Wake on LAN 413
Restrictions for Configuring EnergyWise 414
Information About Configuring EnergyWise 414
Cisco EnergyWise Network 414
EnergyWise Domain 415
Power Level Energy Management 416
Attributes 417
Security 418
Recurrences 418
Time Format and Time Zone 419
Day of the Month and Day of the Week Recurrences 419
Queries 420
Activity Check 421
Wake on LAN 422
WoL with Cisco EnergyWise 422
Configuration Guidelines 422
Enabling Cisco EnergyWise and Powering Devices 422
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