4-5
Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
Chapter 4 Administering the Switch
Managing the System Time and Date
To disable NTP authentication, use the
no ntp authenticate
global configuration command. To remove
an authentication key, use the
no ntp authentication-key
number
global configuration command. To
disable authentication of the identity of a device, use the
no ntp trusted-key
key-number
global
configuration command.
This example shows how to configure the switch to synchronize only to devices providing authentication
key 42 in the device’s NTP packets:
Switch#
configure terminal
Switch(config)#
ntp authenticate
Switch(config)#
ntp authentication-key 42 md5 aNiceKey
Switch(config)#
ntp trusted-key 42
Switch(config)#
end
Switch#
Step 4
ntp trusted-key
key-number
Specifies one or more key numbers (defined in Step 3) that a peer
NTP device must provide in its NTP packets for this switch to
synchronize to it.
By default, no trusted keys are defined.
For
key-number
, specify the key defined in Step 3.
This command provides protection against accidentally
synchronizing the switch to a device that is not trusted.
Step 5
end
Returns to privileged EXEC mode.
Step 6
show running-config
Verifies your entries.
Step 7
copy running-config startup-config
(Optional) Saves your entries in the configuration file.
Command
Purpose
Summary of Contents for Catalyst 4500 Series
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