Command Reference Guide

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Usage
Information
You also must configure an authentication key for NTP traffic using the ntp
authentication-key command.
Related
Commands
ntp authentication-key
c e s
Specify a key for authenticating the NTP server.
Syntax
ntp authentication-key number md5
[0 | 7] key
Parameters
Defaults
NTP authentication is not configured by default. If you do not specify the option [0 | 7], 0 is
selected by default.
Command Modes
CONFIGURATION
Command
History
Usage
Information
After configuring the ntp authentication-key command, configure the ntp trusted-key
command to complete NTP authentication.
FTOS versions 8.2.1.0 and later use an encryption algorithm to store the authentication key
that is different from previous FTOS versions; beginning in version 8.2.1.0, FTOS uses DES
encryption to store the key in the startup-config when you enter the command
ntp
authentication-key
. Therefore, if your system boots with a startup-configuration from an FTOS
versions prior to 8.2.1.0 in which you have configured
ntp authentication-key, the system cannot
correctly decrypt the key, and cannot authenticate NTP packets. In this case you must re-enter
this command and save the running-config to the startup-config.
Version 7.5.1.0 Support added for C-Series
pre-Version 6.1.1.0 Introduced for E-Series
ntp authentication-key Configure authentication key for NTP traffic.
ntp trusted-key Configure a key to authenticate
number
Specify a number for the authentication key.
Range: 1 to 4294967295.
This number must be the same as the number parameter configured in the ntp
trusted-key command.
md5
Specify that the authentication key will be encrypted using MD5 encryption
algorithm.
0
Specify that authentication key will be entered in an unencrypted format (default).
7
Specify that the authentication key will be entered in DES encrypted format.
key
Enter the authentication key in the previously specified format.
Version 8.2.1.0 Added options [0 | 7] for entering authentication key.
Version 7.6.1.0 Support added for S-Series
Version 7.5.1.0 Support added for C-Series
pre-Version 6.1.1.0 Introduced for E-Series