Configure Ntp Authentication - Dell Force10 C150 Configuration Manual

Configure NTP authentication

NTP authentication and the corresponding trusted key provide a reliable means of exchanging NTP
packets with trusted time sources. NTP authentication begins when the first NTP packet is created
following the configuration of keys. NTP authentication in FTOS uses the MD5 algorithm and the key is
embedded in the synchronization packet that is sent to an NTP time source.
FTOS Behavior: 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
authentication-key
prior to 8.2.1.0 in which you have configured
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.
To configure NTP authentication, use these commands in the following sequence in the
CONFIGURATION mode:
Step Command Syntax
ntp authenticate
1
ntp authentication-key
2
ntp trusted-key
3
To view the NTP configuration, use the
privilege mode. Figure 53-5
Figure 53-5. show running-config ntp Command Example
FTOS#show running ntp
!
ntp authenticate
ntp authentication-key 345 md5 5A60910F3D211F02
ntp server 11.1.1.1 version 3
ntp trusted-key 345
FTOS#
. Therefore, if your system boots with a startup-configuration from an FTOS versions
md5
number key
number
show running-config ntp
shows an encrypted authentication key. All keys are encrypted.
ntp authentication-key
Command Mode Purpose
CONFIGURATION Enable NTP authentication.
CONFIGURATION Set an authentication key. Configure the
following parameters:
number:
number
the ntp trusted-key command.
key:
encrypted.
CONFIGURATION Define a trusted key. Configure a number
from 1 to 4294967295.
The
number
authentication-key command.
command
encrypted key
ntp
, the system cannot correctly
Range 1 to 4294967295. This
must be the same as the
Enter a text string. This text string is
number must be the same as the
used in the ntp
(Figure 40) in the EXEC
System Time and Date | 1075
number in