Junos® OS Time Management Administration Guide for Routing ... UniversalCoordinatedTime(UTC)

  • View
    214

  • Download
    0

Embed Size (px)

Text of Junos® OS Time Management Administration Guide for Routing ... UniversalCoordinatedTime(UTC)

  • Junos®OS

    Time Management Administration Guide for Routing Devices

    Modified: 2019-06-21

    Copyright © 2019, Juniper Networks, Inc.

  • Juniper Networks, Inc. 1133 InnovationWay Sunnyvale, California 94089 USA 408-745-2000 www.juniper.net

    Juniper Networks, the Juniper Networks logo, Juniper, and Junos are registered trademarks of Juniper Networks, Inc. in the United States and other countries. All other trademarks, service marks, registeredmarks, 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

    Copyright © 2019 Juniper Networks, Inc. All rights reserved.

    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.

    ENDUSER 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 https://support.juniper.net/support/eula/. By downloading, installing or using such software, you agree to the terms and conditions of that EULA.

    Copyright © 2019, Juniper Networks, Inc.ii

    https://support.juniper.net/support/eula/

  • Table of Contents

    About the Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xi

    Documentation and Release Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xi

    Using the Examples in This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xi

    Merging a Full Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xii

    Merging a Snippet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xii

    Documentation Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiii

    Documentation Feedback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xv

    Requesting Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xv

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

    Creating a Service Request with JTAC . . . . . . . . . . . . . . . . . . . . . . . . . . . xvi

    Chapter 1 Configuring Date and Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

    Setting the Date and Time Locally . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

    NTP Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

    Understanding NTP Time Servers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

    Synchronizing and Coordinating Time Distribution Using NTP . . . . . . . . . . . . . . . 22

    Configuring NTP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

    Configuring the NTP Boot Server . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

    Specifying a Source Address for an NTP Server . . . . . . . . . . . . . . . . . . . . . . . 22

    Configuring NTP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

    Configuring the NTP Time Server and Time Services . . . . . . . . . . . . . . . . . . . . . . . 27

    Configuring the Router or Switch to Operate in Client Mode . . . . . . . . . . . . . . 27

    Configuring the Router or Switch to Operate in Symmetric Active Mode . . . . 28

    Configuring the Router or Switch to Operate in Broadcast Mode . . . . . . . . . . 28

    Configuring the Router or Switch to Operate in Server Mode . . . . . . . . . . . . . 29

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

    Synchronization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

    Configuring NTP Authentication Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

    Configuring the Router or Switch to Listen for Broadcast Messages Using

    NTP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

    Configuring the Router or Switch to Listen for Multicast Messages Using NTP . . . 32

    Automatic Clock Selection Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

    Clock Source Selection Algorithm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

    Clock Selection and Quality Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

    Selection Mode for the Incoming ESMC Quality . . . . . . . . . . . . . . . . . . . . . . . 33

    External Clock Synchronization Overview for ACX Series Routers . . . . . . . . . . . . . 33

    Automatic Clock Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

    Clock Source Selection Algorithm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

    Configuring External Clock Synchronization for ACX Series Routers . . . . . . . . . . . 35

    Global Positioning System (GPS) and the ACX Series Routers . . . . . . . . . . . . . . . 41

    iiiCopyright © 2019, Juniper Networks, Inc.

  • Integrated Global Navigation Satellite System (GNSS) on ACX500 Series

    Routers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

    Assisted Partial Timing Support on ACX500 Routers Overview . . . . . . . . . . . . . . 43

    Chapter 2 Configuring Time Zones . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

    Modifying the Default Time Zone for a Router or Switch Running Junos OS . . . . . 45

    Updating the IANA Time Zone Database on Junos OS Devices . . . . . . . . . . . . . . . 46

    Importing and Installing Time Zone Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

    Configuring a Custom Time Zone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

    Chapter 3 Configuring Network Time Protocols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

    Understanding NTP Time Servers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

    Configuring NTP Authentication Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

    Configuring NTP Authentication Keys (QFabric System) . . . . . . . . . . . . . . . . . . . . 51

    Configuring the NTP Time Server and Time Services . . . . . . . . . . . . . . . . . . . . . . . 52

    Configuring the Switch to Operate in Client Mode . . . . . . . . . . . . . . . . . . . . . . 52

    Configuring the Router or Switch to Operate in Symmetric Active Mode . . . . 53

    Configuring the Router or Switch to Operate in Broadcast Mode . . . . . . . . . . 53

    Configuring the Router or Switch to Operate in Server Mode . . . . . . . . . . . . . 54

    Configuring the NTP Time Server and Time Services (QFabric System) . . . . . . . . 55

    Configuring the Switch to Listen for Broadcast Messages Using NTP . . . . . . . . . . 55

    Configuring the Switch to Listen for Multicast Messages Using NTP . . . . . . . . . . 56

    Setting the Date and Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

    Synchronizing and Coordinating Time Distribution Using NTP . . . . . . . . . . . . . . . 57

    Configuring NTP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

    Configuring the NTP Boot Server . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

    Specifying a Source Address for an NTP Server . . . . . . . . . . . . . . . . . . . . . . . 58

    Example: Configuring NTP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

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

    Synchronization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

    Chapter 4 Configuring Precision Time Protocols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

    Understanding Transparent Clocks in Precision Time Protocol . . . . . . . . . . . . . . . 66

    IEEE 1588v2 PTP Boundary Clock Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

    IEEE 1588v2 PTP Boundary Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

    Clock Clients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

    IEEE 1588v2 Precision Timing Protocol (PTP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

    Understanding the PTP G.8275.2 Enhanced Profile (Telecom Profile) . . . . . . . . . 74