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NTP Specifications Configuring Network Time Protocol (NTP)
page 4-2 OmniSwitch 6250/6450 Switch Management Guide May 2012
NTP Specifications
NTP Defaults Table
The following table shows the default settings of the configurable NTP parameters:
NTP Defaults
RFCs supported 1305–Network Time Protocol
Platforms Supported OmniSwitch 6250, 6450
Maximum number of NTP servers per client 3
Parameter Description Command Default Value/Comments
Specifies an NTP server from which
this switch receives updates
ntp server version: 4
minpoll: 6
prefer: no
key: 0
Used to activate client ntp client disabled
Used to activate NTP client
broadcast mode
ntp broadcast disabled
Used to set the advertised broadcast
delay, in microseconds
ntp broadcast-delay 4000 microseconds
- OmniSwitch 6250/6450 1
- Switch Management Guide 1
- Contents 10
- About This Guide 13
- Who Should Read this Manual? 14
- What is in this Manual? 14
- What is Not in this Manual? 15
- Documentation Roadmap 16
- Related Documentation 18
- User Manual CD 20
- Technical Support 20
- 1 Managing System Files 21
- File Transfer 23
- Switch Directories 24
- File and Directory Management 25
- Using Wildcards 27
- Directory Commands 28
- Changing Directories 29
- Displaying Directory Contents 30
- Making a New Directory 31
- Copying an Existing Directory 32
- File Commands 34
- Secure Copy an Existing File 35
- Delete an Existing File 36
- Managing Files on Switches 37
- Utility Commands 38
- Using Secure Shell FTP 43
- Using TFTP to Transfer Files 45
- Using Zmodem 45
- Directories on the Switch 47
- Available Image Files 48
- Verifying Directory Contents 55
- Installing Software Licenses 56
- Licensed Features 57
- Setting the System Clock 59
- Enabling DST 62
- 2 Logging Into the Switch 65
- Login Specifications 67
- Login Defaults 67
- Management Interfaces 70
- User Accounts 71
- Using Telnet 72
- Using FTP 74
- Secure Shell Interface 77
- Secure Shell Authentication 79
- Connection Phase 80
- Modifying the Login Banner 85
- Configuring Login Parameters 87
- Enabling the DNS Resolver 88
- Verifying Login Settings 89
- 3 Using SNMP 91
- SNMP Specifications 92
- SNMP Defaults 92
- Using SNMP SNMP Defaults 93
- Management Station 94
- Filtering by Trap Families 95
- Filtering by Individual Traps 96
- SNMP Overview 97
- SNMP Versions 98
- Using SNMP SNMP Overview 99
- Configuring Community Strings 100
- Setting SNMP Security 102
- Working with SNMP Traps 103
- Authentication Trap 104
- Trap Management 104
- SNMP MIB Information 105
- Industry Standard MIBs 106
- Enterprise (Proprietary) MIBs 110
- 4 Configuring Network Time 115
- Protocol (NTP) 115
- NTP Specifications 116
- NTP Defaults Table 116
- NTP Quick Steps 117
- NTP Overview 119
- Using NTP in a Network 120
- Authentication 122
- Configuring NTP 123
- NTP Servers 124
- Setting the Version Number 125
- Marking a Server as Preferred 125
- Using Authentication 126
- Verifying NTP Configuration 127
- 5 Managing CMM 129
- Directory Content 129
- CMM Specifications 130
- CMM Files 131
- Software Rollback Feature 132
- Redundancy 137
- (Non-Redundant) 141
- Scheduling a Reboot 142
- Cancelling a Scheduled Reboot 142
- -> show reload 143
- -> show reload status 143
- Working Certified 144
- Primary CMM 144
- -> write memory 145
- Cancelling a Rollback Timeout 148
- -> copy working certified 150
- -> copy certified working 150
- Show Switch Files 152
- Rebooting the Switch 153
- -> copy flash-synchro 156
- -> takeover 157
- Using the USB Flash Drive 160
- Disaster Recovery Using USB 161
- Displaying CMM Conditions 163
- 6 Using the CLI 165
- CLI Specifications 166
- CLI Overview 167
- Text Conventions 168
- Using “Show” Commands 169
- Using the “No” Form 169
- Using “Alias” Commands 169
- Partial Keyword Completion 170
- Command Help 171
- Debug UPDATE, SHOW, NO, DEBUG 172
- Command Set Name Commands 172
- CLI Services 175
- Inserting Characters 176
- Syntax Checking 177
- Prefix Recognition 177
- Show Prefix 178
- Command History 179
- Enabling Command Logging 181
- Disabling Command Logging 181
- Changing the Screen Size 183
- Changing the CLI Prompt 183
- Displaying Table Information 184
- Filtering Table Information 185
- Multiple User Sessions 186
- Terminating Another Session 188
- Application Example 189
- Verifying CLI Usage 191
- 7 Working With 193
- Configuration Files 193
- Configuration Files Overview 198
- Cancelling a Timed Session 199
- Setting the Error File Limit 200
- Displaying a Text File 201
- Text Editing on the Switch 201
- Snapshot Feature List 202
- User-Defined Naming Options 203
- Editing Snapshot Files 203
- Example Snapshot File Text 204
- Verifying File Configuration 206
- 8 Managing Automatic 207
- Remote Configuration 207
- Download 207
- • Pathname: 255 characters 208
- • Filename: 63 characters 208
- Overview 211
- Network Components 212
- LED Status 213
- UDP/DHCP Relay 214
- Process Illustration 216
- Additional Process Notes 217
- Download Component Files 218
- Instruction File Syntax 219
- Firmware Upgrade Files 220
- Bootup Configuration File 220
- Debug Configuration File 221
- Script File 221
- Aggregate Association 222
- Nearest-Edge Mode Operation 226
- Access Switch 227
- Zero Touch License Upgrade 228
- Troubleshooting 229
- Script File Errors 230
- Error Description Table 231
- 9 Managing Switch User 233
- Accounts 233
- User Database Specifications 234
- User Account Defaults 234
- Overview of User Accounts 236
- “Managing Switch Security.” 237
- Startup Defaults 238
- Default User Settings 241
- How User Settings Are Saved 243
- Creating a User 244
- Removing a User 245
- User-Configured Password 246
- 4 Enter the password again 247
- Default Password Expiration 252
- -> user password-history 2 253
- -> user password-history 0 253
- -> user password-min-age 7 254
- -> user lockout-window 30 255
- -> user lockout j_smith 258
- -> user unlock j_smith 258
- -> user thomas no snmp 263
- Setting Up End-User Profiles 264
- Creating End-User Profiles 265
- 10 Managing Switch Security 271
- Switch Security Defaults 272
- Switch Security Overview 273
- Authenticated Switch Access 274
- ASA and Authenticated VLANs 275
- Enabling Switch Access 280
- Using Secure Shell 281
- 11 Using WebView 285
- WebView CLI Defaults 286
- Browser Setup 286
- WebView CLI Commands 287
- Enabling/Disabling SSL 288
- Changing the HTTPS Port 288
- WebView Overview 289
- Toolbar 290
- View/Configuration Area 291
- A Software License and 293
- Copyright Statements 293
- C. Linux 297
- E. University of California 302
- G.Random.c 302
- H. Apptitude, Inc 303
- I. Agranat 303
- J. RSA Security Inc 303
- K. Sun Microsystems, Inc 304
- L. Wind River Systems, Inc 304
- N.Remote-ni 305
- O.GNU Zip 305
- Q.Boost C++ Libraries 306
- R. U-Boot 306
- S. Solaris 306
- U. CURSES 307
- V. Z M o d e m 307
- W.Boost Software License 307
- X. OpenLDAP 307
- Y. B IT M A P.C 308
- Z. University of Toronto 308
- AA.Free/OpenBSD 308
- B SNMP Trap Information 309
- SNMP Traps Table 310
- alaPimGroup 327
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