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Junos®OS

Time Management Administration Guide for

Routing Devices

Release

13.3

Published: 2014-04-22

Juniper Networks, Inc.

1194 North Mathilda Avenue

Sunnyvale, California 94089

USA

408-745-2000

www.juniper.net

Juniper Networks, Junos, Steel-Belted Radius, NetScreen, and ScreenOS are registered trademarks of Juniper Networks, Inc. in the United

States and other countries. The Juniper Networks Logo, the Junos logo, and JunosE are trademarks of Juniper Networks, Inc. All other

trademarks, service marks, registered trademarks, or registered service marks are the property of their respective owners.

Juniper Networks assumes no responsibility for any inaccuracies in this document. Juniper Networks reserves the right to change, modify,

transfer, or otherwise revise this publication without notice.

Junos®OS Time Management Administration Guide for Routing Devices

13.3

The information in this document is current as of the date on the title page.

YEAR 2000 NOTICE

Juniper Networks hardware and software products are Year 2000 compliant. Junos OS has no known time-related limitations through the

year 2038. However, the NTP application is known to have some difficulty in the year 2036.

END USER LICENSE AGREEMENT

The Juniper Networks product that is the subject of this technical documentation consists of (or is intended for use with) Juniper Networks

software. Use of such software is subject to the terms and conditions of the End User License Agreement (“EULA”) posted at

http://www.juniper.net/support/eula.html. By downloading, installing or using such software, you agree to the terms and conditions of

that EULA.

Table of Contents

AbouttheDocumentation............................................vii

DocumentationandReleaseNotes.................................vii

SupportedPlatforms.............................................vii

UsingtheExamplesinThisManual.................................viii

MergingaFullExample.......................................viii

MergingaSnippet............................................ix

DocumentationConventions.......................................ix

DocumentationFeedback.........................................xi

RequestingTechnicalSupport......................................xi

Self-Help Online Tools and Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . xi

OpeningaCasewithJTAC.....................................xii

Part 1 Overview

Chapter1 TimeManagementOverview........................................3

NTPOverview.......................................................3

UnderstandingNTPTimeServers.......................................5

Part 2 Configuration

Chapter2 ConfiguringTime...................................................9

SettingtheDateandTimeLocally......................................9

ConfiguringNTP....................................................10

Modifying the Default Time Zone for a Router or Switch Running Junos OS . . . . . 12

Synchronizing and Coordinating Time Distribution Using NTP . . . . . . . . . . . . . . . . 13

ConfiguringNTP.................................................13

ConfiguringtheNTPBootServer...................................13

Specifying a Source Address for an NTP Server . . . . . . . . . . . . . . . . . . . . . . . . 13

Configuring the NTP Time Server and Time Services . . . . . . . . . . . . . . . . . . . . . . . 14

Configuring the Router or Switch to Operate in Client Mode . . . . . . . . . . . . . . 15

Configuring the Router or Switch to Operate in Symmetric Active Mode . . . . 15

Configuring the Router or Switch to Operate in Broadcast Mode . . . . . . . . . . 16

Configuring the Router or Switch to Operate in Server Mode . . . . . . . . . . . . . 16

Example: Configuring NTP as a Single Time Source for Router and Switch Clock

Synchronization .................................................17

ConfiguringNTPAuthenticationKeys...................................18

Configuring the Router or Switch to Listen for Broadcast Messages Using

NTP ..........................................................19

Configuring the Router or Switch to Listen for Multicast Messages Using NTP . . . 19

Updating the IANA Time Zone Database on Junos Devices . . . . . . . . . . . . . . . . . . 20

Importing and Installing Time Zone Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

ConfiguringaCustomTimeZone...................................21

Chapter3 ConfigurationStatements..........................................23

System Management Configuration Statements . . . . . . . . . . . . . . . . . . . . . . . . . . 23

authentication-key..................................................30

boot-server (NTP) ..................................................31

broadcast .........................................................32

broadcast-client....................................................33

multicast-client ....................................................33

ntp ..............................................................34

peer(NTP)........................................................35

server(NTP).......................................................36

source-address (NTP, RADIUS, System Logging, or TACACS+) . . . . . . . . . . . . . . . 37

system ...........................................................38

time-zone.........................................................39

use-imported-time-zones ............................................41

Part 3 Administration

Chapter4 Operational Commands ...........................................45

set date ..........................................................46

Chapter5 Monitoring Commands ............................................47

showntpassociations...............................................48

showntpstatus....................................................50

Part 4 Index

Index .........................................................55

Time Management Administration Guide for Routing Devices

List of Tables

AbouttheDocumentation..........................................vii

Table1:NoticeIcons..................................................ix

Table2:TextandSyntaxConventions....................................x

Part 3 Administration

Chapter5 Monitoring Commands ............................................47

Table 3: show ntp associations Output Fields . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Table 4: show ntp status Output Fields . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Time Management Administration Guide for Routing Devices

About the Documentation

•Documentation and Release Notes on page vii

•Supported Platforms on page vii

•Using the Examples in This Manual on page viii

•Documentation Conventions on page ix

•Documentation Feedback on page xi

•Requesting Technical Support on page xi

Documentation and Release Notes

To obtain the most current version of all Juniper Networks®technical documentation,

see the product documentation page on the Juniper Networks website at

http://www.juniper.net/techpubs/.

If the information in the latest release notes differs from the information in the

documentation, follow the product Release Notes.

Juniper Networks Books publishes books by Juniper Networks engineers and subject

matter experts. These books go beyond the technical documentation to explore the

nuances of network architecture, deployment, and administration. The current list can

be viewed at http://www.juniper.net/books.

Supported Platforms

For the features described in this document, the following platforms are supported:

•M Series

•MX Series

•T Series

•J Series

•EX Series

•PTX Series

Using the Examples in This Manual

If you want to use the examples in this manual, you can use the load merge or the load

merge relative command. These commands cause the software to merge the incoming

configuration into the current candidate configuration. The example does not become

active until you commit the candidate configuration.

If the example configuration contains the top level of the hierarchy (or multiple

hierarchies), the example is a full example. In this case, use the load merge command.

If the example configuration does not start at the top level of the hierarchy, the example

isasnippet. In this case, use the load merge relative command. These procedures are

described in the following sections.

Merging a Full Example

To merge a full example, follow these steps:

1. From the HTML or PDF version of the manual, copy a configuration example into a

text file, save the file with a name, and copy the file to a directory on your routing

platform.

For example, copy the following configuration to a file and name the file ex-script.conf.

Copy the ex-script.conf file to the /var/tmp directory on your routing platform.

system {

scripts {

commit {

file ex-script.xsl;

}

interfaces {

fxp0 {

disable;

unit 0 {

family inet {

address 10.0.0.1/24;

}

2. Merge the contents of the file into your routing platform configuration by issuing the

load merge configuration mode command:

[edit]

user@host# load merge /var/tmp/ex-script.conf

load complete

Time Management Administration Guide for Routing Devices

Merging a Snippet

To merge a snippet, follow these steps:

1. From the HTML or PDF version of the manual, copy a configuration snippet into a text

file, save the file with a name, and copy the file to a directory on your routing platform.

For example, copy the following snippet to a file and name the file

ex-script-snippet.conf. Copy the ex-script-snippet.conf file to the /var/tmp directory

on your routing platform.

commit {

file ex-script-snippet.xsl; }

2. Move to the hierarchy level that is relevant for this snippet by issuing the following

configuration mode command:

[edit]

user@host# edit system scripts

[edit system scripts]

3. Merge the contents of the file into your routing platform configuration by issuing the

load merge relative configuration mode command:

[edit system scripts]

user@host# load merge relative /var/tmp/ex-script-snippet.conf

load complete

For more information about the load command, see the CLI User Guide.

Documentation Conventions

Table 1 on page ix defines notice icons used in this guide.

Table 1: Notice Icons

DescriptionMeaningIcon

Indicates important features or instructions.Informational note

Indicates a situation that might result in loss of data or hardware damage.Caution

Alerts you to the risk of personal injury or death.Warning

Alerts you to the risk of personal injury from a laser.Laser warning

Table 2 on page x defines the text and syntax conventions used in this guide.

About the Documentation

Table 2: Text and Syntax Conventions

ExamplesDescriptionConvention

To enter configuration mode, type the

configure command:

user@host> configure

Represents text that you type.Bold text like this

user@host> show chassis alarms

No alarms currently active

Represents output that appears on the

terminal screen.

Fixed-width text like this

•A policy term is a named structure

that defines match conditions and

actions.

•Junos OS CLI User Guide

•RFC 1997, BGP Communities Attribute

•Introduces or emphasizes important

new terms.

•Identifies guide names.

•Identifies RFC and Internet draft titles.

Italic text like this

Configure the machine’s domain name:

[edit]

root@# set system domain-name

domain-name

Represents variables (options for which

you substitute a value) in commands or

configuration statements.

Italic text like this

•To configure a stub area, include the

stub statement at the [edit protocols

ospf area area-id] hierarchy level.

•The console port is labeled CONSOLE.

Represents names of configuration

statements, commands, files, and

directories; configuration hierarchy levels;

or labels on routing platform

components.

Text like this

stub <default-metric metric>;Encloses optional keywords or variables.< > (angle brackets)

broadcast | multicast

(string1 |string2 |string3)

Indicates a choice between the mutually

exclusive keywords or variables on either

side of the symbol. The set of choices is

often enclosed in parentheses for clarity.

| (pipe symbol)

rsvp { # Required for dynamic MPLS onlyIndicates a comment specified on the

same line as the configuration statement

to which it applies.

# (pound sign)

community name members [

community-ids ]

Encloses a variable for which you can

substitute one or more values.

[ ] (square brackets)

[edit]

routing-options {

static {

route default {

nexthop address;

retain;

}

Identifies a level in the configuration

hierarchy.

Indention and braces ( { } )

Identifies a leaf statement at a

configuration hierarchy level.

; (semicolon)

GUI Conventions

Time Management Administration Guide for Routing Devices

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