NTP Configuration

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Table of Contents

Table of Contents
Chapter 1 Overview.........................................................................................................................................1

1.1 Stipulation..........................................................................................................................................1
1.1.1 Format Stipulation in the Command Line..........................................................................1

Chapter 2 NTP Configuration........................................................................................................................ 2
2.1 Overview............................................................................................................................................2
2.2 NTP Configuration............................................................................................................................2

2.2.1 Configure the Equipment As an NTP Server....................................................................2
2.2.2 Configure NTP Authentication Function............................................................................2
2.2.3 Configure NTP Association................................................................................................. 3

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Table of Contents

Chapter 1 Overview

1.1 Stipulation

1.1.1 Format Stipulation in the Command Line

Syntax Meaning
Stands for the keyword in the command line, which stays unchanged and must

Bold be entered without any modification. It is presented as a bold in the command
line.
Stands for the parameter in the command line, which must be replaced by the

{italic}
actual value. It must be presented by the italic in the brace.
Stands for the parameter in the command line, which must be replaced by the

<italic>
actual value. It must be presented by the italic in the point bracket.

[ ] Stands for the optional parameter, which is in the square bracket.
{ x | y | ... } Means that you can choose one option from two or more options.
[ x | y | ... ] Means that you can choose one option or none from two or more options.

Means that you has to choose at least one option from two or more options, or
{ x | y | ... } *

even choose all options.
[ x | y | ... ] * Means that you can choose multiple options or none from two or more options.
&<1-n> Means that the parameter before the “&” symbol can be entered 1～n times.
# Means that the line starting with the “#” symbol is an explanation line.

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Chapter 2 NTP Configuration

2.1 Overview
Network Time Protocol (NTP) is a type of computer time synchronization protocol

which can be used for time synchronization between distributed time servers and
clients. It has highly accurate time correction function and can prevent malicious
protocol attacks through encrypted authentication. Clients and servers communicate
through the User Datagram Protocol (UDP), and the port number is 123.

2.2 NTP Configuration

2.2.1 Configure the Equipment As an NTP Server

Configuration mode: Global

Command Purpose

ntp master primary In the event that the equipment does not
have an upper-level NTP server, configure
the equipment as the original NTP server
(stratum = 1).

ntp master secondary In the event that the equipment has an
upper-level NTP server, configure the
equipment as the secondary NTP server.
(In other words, the equipment cannot
provide time synchronization service for NTP
clients unless the "ntp server" command is
configured and time synchronization is
achieved in designated servers.)

2.2.2 Configure NTPAuthentication Function

Configuration mode: Global

Command Purpose

ntp authentication enable Enable the authentication function (disabled
by default).

ntp authentication key keyid md5 Configure NTP md5 authentication keyid and
password corresponding keys.

ntp authentication trusted-key keyid Configure the keyid corresponding key as
the trusted key.

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2.2.3 Configure NTPAssociation

Configuration mode: Global

Command Purpose

ntp server ip-address [version number | Configure the IP address of NTP server; the
key keyid]* version number, key number, and the

encryption key can be designated.

ntp peer ip-address [version number | key The following command can be used to
keyid]* configure NTP peer IP address of the device,

designated version number and key number.

Usage Guidelines:

1. Equipment can provide time services for NTP clients provided that the equipment has
achieved time synchronization; otherwise the client device that employs the equipment as its
server cannot achieve time synchronization.

2. To conduct NTP authentication, both parties must open the NTP authentication function
simultaneously, configure the same keyid and key, and designate the keyid as trusted;
otherwise time synchronization would fail.

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