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Configuring NTP
This example shows how to configure the NTP server address, enable NTP client mode on the switch,
and verify the configuration:
Console> (enable) set ntp server 172.20.52.65
NTP server 172.20.52.65 added.
Console> (enable) set ntp client enable
NTP Client mode enabled
Console> (enable) show ntp
Current time: Tue Jun 23 1998, 20:29:25
Timezone: '', offset from UTC is 0 hours
Summertime: '', disabled
Last NTP update: Tue Jun 23 1998, 20:29:07
Broadcast client mode: disabled
Broadcast delay: 3000 microseconds
Client mode: enabled
NTP-Server
----------------------------------------
172.16.52.65
Console> (enable)
Configuring Authentication in Client Mode
Authentication can enhance the security of a system running NTP. When you enable the authentication
feature, the client switch will send time-of-day requests only to trusted NTP servers. The authentication
feature is documented in RFC 1305.
You can configure up to ten authentication keys per client. Each authentication key is actually a pair of
two keys:
•
•
To authenticate the message, the client authentication key must match the key on the server. Therefore,
the authentication key must be securely distributed in advance (that is, the client administrator must get
the key pair from the server administrator and configure it on the client).
To enable authentication, perform this task in privileged mode:
Task
Step 1
Define an authentication key pair for NTP and
specify whether the key will be trusted or
untrusted.
Step 2
Specify the IP address of the NTP server and the
public key.
Step 3
Enable NTP client mode.
Step 4
Enable NTP authentication.
Step 5
Verify the NTP configuration.
Software Configuration Guide—Catalyst 4000 Family, Catalyst 2948G, Catalyst 2980G, Releases 6.3 and 6.4
35-4
A public key number—A 32-bit integer that can range from 1 to 4294967295
A secret key string—An arbitrary string of 32 characters, including all printable characters and
spaces
Chapter 35
Command
set ntp key public_key [trusted | untrusted] md5
secret_key
set ntp server ip_addr [key public_key]
set ntp client enable
set ntp authentication enable
show ntp [noalias]
Configuring NTP
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