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9-13
Time Protocols
SNTP: Viewing, Selecting, and Configuring
Figure 9-7. Example of SNTP with Time Sychronization Disabled
Disabling the SNTP Mode. If you want to prevent SNTP from being used
even if selected by
timesync (or the Menu interface’s Time Sync Method param-
eter), configure the SNTP mode as disabled.
Syntax: no sntp
Disables SNTP by changing the SNTP mode
configuration to
Disabled.
For example, if the switch is running SNTP in Unicast mode with an SNTP
server at 10.28.227.141 and a server version of 3 (the default),
no sntp changes
the SNTP configuration as shown below, and disables time synchronization
on the switch.
Figure 9-8. Example of Disabling Time Synchronization by Disabling the SNTP Mode
Even though the Time Sync Mode is set to Sntp,
time synchronization is disabled because no
sntp has disabled the SNTP Mode parameter.
- ProCurve Switches 1
- ProCurve 3
- Switch 2610 Series 3
- Switch 2610-PWR Series 3
- Management and Configuration 3
- 8 Configuring IP Addressing 8
- 9 Time Protocols 9
- 12 Port Trunking 12
- A File Transfers 14
- C Troubleshooting 15
- D MAC Address Management 17
- Product Documentation 19
- Software Feature Index 20
- Getting Started 25
- Introduction 26
- Conventions 26
- Command Prompts 27
- Screen Simulations 27
- Sources for More Information 28
- Need Only a Quick Start? 30
- Advantages of Using the CLI 34
- Using the Menu Interface 39
- Command Line (CLI) option.) 41
- Main Menu Features 45
- [S] (for the 48
- [C] (for 48
- [B] (for the Back action) 48
- Menu Features List 52
- Where To Go From Here 53
- Accessing the CLI 56
- Using the CLI 56
- Privilege Levels at Logon 57
- Privilege Level Operation 58
- Manager Privileges 59
- How To Move Between Levels 61
- ? symbol lists the 62
- Command Option Displays 64
- Configuration Modes 67
- CLI Control and Editing 70
- General Features 73
- Session with the Switch 74
- Plus (PCM+) 75
- First-Time 76
- Install Alert 76
- Interface Session 77
- Using the Passwords 80
- Using the User Names 80
- If You Lose a Password 80
- The Help Button 81
- Support/Mgmt URLs Feature 82
- Support URL 83
- Status Reporting Features 84
- Port Utilization 85
- The Alert Log 88
- The Status Bar 90
- Management 97
- Using the CLI To Implement 100
- Configuration Changes 100
- Interfaces To Implement 103
- [Enter] key, then 104
- [S] (for Save) 104
- [C] (for Cancel) 104
- Reboot Switch option 105
- Interface 106
- Image Options 107
- The unequal code 108
- Switch Software Downloads 109
- Caution--No 111
- Rebooting the Switch 112
- Operating Notes 116
- Multiple Configuration Files 117
- General Operation 118
- Configuration Enabled 120
- Erasing a Startup-Config File 127
- Serially Connected Host 130
- Connected Host 131
- Contents 133
- Overview 134
- Web, and Telnet 135
- Interface Access 136
- Parameters 136
- ■ VT100 operation 139
- ■ 19,200 baud 139
- ■ No flow control 139
- ■ 10-minute inactivity time 139
- ■ Critical log events 139
- Denying Interface Access by 141
- Terminating Remote 141
- Management Sessions 141
- System Information 142
- System Info 147
- [?] in the web 147
- Configuring IP Addressing 149
- IP Configuration 151
- Live (TTL) 153
- [E] (for Edit) 154
- IP Configuration] 159
- DHCP/Bootp Operation 160
- ■ For Bootp operation: 163
- ■ For DHCP operation: 163
- File Downloads 164
- Time Protocols 169
- Overview: Selecting a Time 171
- Time Protocol Operation 171
- Configuring 172
- Broadcast as the SNTP mode 177
- Disabled 181
- – TIMEP (the default) 183
- Time Sync Method 186
- SNTP Servers 189
- Prioritized list of SNTP 190
- Server IP Addresses 190
- Configured 191
- In this example 199
- Current Operating Mode 201
- Configuring Auto-MDIX 205
- Manual Auto-MDIX Override 206
- Per-Port MDI 208
- Configuration 208
- Operating Mode 208
- Viewing Transceiver Status 209
- Jumbo Frames 211
- Operating Rules 212
- Troubleshooting 218
- QoS Passthrough Mode 219
- Indicates QoS Pass-Through 221
- Incoming Packets 222
- Friendly Port 231
- Configuring UDLD 234
- Enabling UDLD 235
- Viewing UDLD Information 237
- Port 4 is shown as blocked 238
- Related Publications 243
- Terminology 243
- Powered Device (PD) Support 244
- Power Priority 245
- Configuring PoE Operation 247
- Cycling Power on a Port 248
- Indicates PoE support for 249
- reserved 252
- PoE Event Log Messages 255
- Port Trunking 259
- Port Status and Configuration 260
- Link Connections 261
- Trunk Configuration Methods 262
- or show ip igmp listing 265
- Port Trunk Group 268
- Default Port Operation 276
- LACP Notes and Restrictions 277
- Applications 283
- SNMP Management Features 286
- SNMP Version 3 Commands 288
- SNMPv3 Enable 289
- SNMP Version 3 Users 290
- Group Access Levels 293
- SNMP Communities 294
- Two Operator Access Levels 295
- SNMP Notification and Traps 300
- matches taglist value 301
- Trap Features 302
- Configuring Trap Receivers 303
- Advanced Management: RMON 307
- LLDP Terminology 311
- General LLDP Operation 312
- LLDP Configuration Options 312
- LLDP Standards Compatibility 315
- LLDP Operating Rules 316
- LLDP Operation and Commands 317
- Note: This value corresponds 318
- LLDP Advertisements” 319
- ■ Chassis ID (TLV) 324
- ■ Port Type (TLV subelement) 324
- ■ Port ID (TLV) 324
- ■ Port Description (TLV) 325
- ■ System Name (TLV) 325
- ■ System Description (TLV) 325
- ■ System Capabilities (TLV) 325
- Displaying Advertisement Data 326
- Advertisements 327
- Displaying LLDP Statistics 331
- LLDP Operating Notes 334
- LLDP and CDP Data Management 335
- CDP Operation and Commands 337
- Per-Port CDP Enable/Disable 338
- ■ show cdp displays 339
- File Transfers 341
- Downloading Switch Software 342
- [Enter] to begin 345
- Using Secure Copy and SFTP 347
- How It Works 348
- The SCP/SFTP Process 349
- Command Options 349
- Authentication 350
- SCP/SFTP Operating Notes 350
- PC or UNIX Workstation 351
- Switch-to-Switch Download 354
- Software 356
- [Enter] 359
- Host, PC, or Unix Workstation 361
- Status and Counters Data 368
- General System Information 370
- Menu Access 371
- CLI Access 371
- Module Information 372
- Port Status 373
- Control Status 374
- [Enter]. The address 379
- Prompt for Selecting 380
- Menu Access to STP Data 382
- CLI Access to STP Data 383
- Loop Protection 384
- Configuring Loop Protection 385
- VLAN Information 388
- Features 391
- [Y]) to select Yes 392
- [Enter], then press [S] (for 393
- Monitored Ports 394
- Troubleshooting Approaches 399
- Unusual Network Activity 403
- Prioritization Problems 404
- IGMP-Related Problems 404
- LACP-Related Problems 405
- Radius-Related Problems 409
- Problems 410
- SSH-Related Problems 411
- Stacking-Related Problems 412
- TACACS-Related Problems 412
- VLAN-Related Problems 414
- Event Log Operation 417
- Range of Events in the Log 419
- Range of Log Events Displayed 419
- Log Status Line 419
- Debug and Syslog Operation 421
- Debug Types 422
- - Reserved for system use 423
- Diagnostic Tools 428
- Ping and Link Tests 429
- CLI: Ping or Link Tests 431
- Traceroute Command 436
- Restoring a Flash Image 441
- MAC Address Management 445
- Viewing the MAC Addresses of 450
- Connected Devices 450
- ■ Alaska 453
- ■ Canada and Continental US 453
- ■ Middle Europe and Portugal 453
- ■ Southern Hemisphere 453
- ■ Western Europe 453
- Numerics 457
- 2 – Index 458
- Index – 3 459
- 4 – Index 460
- LLDP neighbor data … 13-53 461
- 6 – Index 462
- Index – 7 463
- 8 – Index 464
- Index – 9 465
- 10 – Index 466
- Index – 11 467
- Development Company, L.P 469
- November 2008 469
- Manual Part Number 469
- 5991-8640 469
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