OS6860(E)_AOS_8.1.1.R01_Switch_Management_Guide

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NTP Quick Steps Configuring Network Time Protocol (NTP) 5 You can check the client configuration using the show ntp status command, as shown: -> show ntp client Current time: THU SEP 15 2013 17:44:54 (UTC) Last NTP update: THU SEP 15 2013 17:30:54 Client mode: enabled Broadcast client mode: disabled Broadcast delay (microseconds): 4000 page 11-4 OmniSwitch AOS Release 8 Switch Management Guide May 2014
Configuring Network Time Protocol (NTP) NTP Overview NTP Overview Network Time Protocol (NTP) is used to synchronize the time of a computer client or server to another server or reference time source, such as a radio or satellite receiver. It provides client time accuracies within a millisecond on LANs, and up to a few tens of milliseconds on WANs relative to a primary server synchronized to Universal Coordinated Time (UTC) (via a Global Positioning Service receiver, for example). Typical NTP configurations utilize multiple redundant servers and diverse network paths in order to achieve high accuracy and reliability. Some configurations include cryptographic authentication to prevent accidental or malicious protocol attacks. It is important for networks to maintain accurate time synchronization between network nodes. The standard timescale used by most nations of the world is based on a combination of UTC (representing the Earth’s rotation about its axis), and the Gregorian Calendar (representing the Earth’s rotation about the Sun). The UTC timescale is disciplined with respect to International Atomic Time (TAI) by inserting leap seconds at intervals of about 18 months. UTC time is disseminated by various means, including radio and satellite navigation systems, telephone modems, and portable clocks. Special purpose receivers are available for many time-dissemination services, including the Global Position System (GPS) and other services operated by various national governments. For reasons of cost and convenience, it is not possible to equip every computer with one of these receivers. However, it is possible to equip some computers with these clocks, which then act as primary time servers to synchronize a much larger number of secondary servers and clients connected by a common network. In order to do this, a distributed network clock synchronization protocol is required which can read a server clock, transmit the reading to one or more clients, and adjust each client clock as required. Protocols that do this include NTP. OmniSwitch AOS Release 8 Switch Management Guide May 2014 page 11-5
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Part No. 060391-10, Rev. A May 2014
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Contents About This Guide .........
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Contents Using the Switch as an FTP
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Contents Account and Password Polic
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Contents Authentication Trap ......
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Contents Firmware Upgrade Files ...
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About This Guide This OmniSwitch AO
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About This Guide Documentation Road
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About This Guide Related Documentat
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1 Logging Into the Switch Logging i
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Logging Into the Switch Quick Steps
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Logging Into the Switch Overview of
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Logging Into the Switch Accessing t
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Logging Into the Switch Setting the
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Logging Into the Switch Using Secur
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Logging Into the Switch Modifying t
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Logging Into the Switch Enabling th
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Logging Into the Switch Enabling th
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2 Managing System Files This chapte
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Managing System Files Switch Admini
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Managing System Files File and Dire
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Managing System Files Loading Softw
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Managing System Files Loading Softw
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Managing System Files Setting the S
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Managing System Files Setting the S
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3 Managing CMM Directory Content Th
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Managing CMM Directory Content CMM
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Managing CMM Directory Content Mana
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Managing CMM Directory Content Usin
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4 Using the CLI Alcatel-Lucent’s
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Using the CLI Command Entry Rules a
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Using the CLI Command Help -> sh vl
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Using the CLI Logging CLI Commands
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Using the CLI Customizing the Scree
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5 Working With Configuration Files
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Working With Configuration Files Tu
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Working With Configuration Files Qu
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Working With Configuration Files Co
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Working With Configuration Files Cr
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Working With Configuration Files Cr
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6 Managing Switch User Accounts Swi
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Managing Switch User Accounts User
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Managing Switch User Accounts Overv
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Managing Switch User Accounts Overv
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Managing Switch User Accounts Creat
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Managing Switch User Accounts Confi
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Managing Switch User Accounts Setti
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Managing Switch User Accounts Multi
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7 Managing Switch Security Switch s
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Managing Switch Security Switch Sec
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Managing Switch Security Authentica
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Managing Switch Security Quick Step
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Managing Switch Security Setting Up
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Managing Switch Security Configurin
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8 Using WebView The switch can be m
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Page 137 and 138: 9 Using SNMP The Simple Network Man
Page 139 and 140: Using SNMP Quick Steps for Setting
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Page 143 and 144: Using SNMP SNMP Overview Using SNMP
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Page 149 and 150: Using SNMP Working with SNMP Traps
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Page 195 and 196: 12 Managing Automatic Remote Config
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Configuring Virtual Chassis Interac
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Configuring Virtual Chassis Configu
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Configuring Virtual Chassis Configu
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Configuring Virtual Chassis Display
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A Software License and Copyright St
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Alcatel-Lucent License Agreement Al
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B SNMP Trap Information This append
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SNMP Traps Table No. Trap Name Obje
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Index Symbols !! command 4-6 A aaa
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Index Network Time Protocol see NTP
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OS6860(E)_AOS_8.1.1.R01_Switch_Management_Guide

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