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Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
OL-8978-04
Chapter 34 Configuring NTP
Configuring NTP on the Switch
Configuring NTP in Client Mode
Configure the switch in NTP client mode if you want the client switch to regularly send time-of day
requests to an NTP server. You can configure up to ten server addresses per client.
To configure the switch in NTP client mode, perform this task in privileged mode:
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 authentication, the
client switch sends the time-of-day requests to the trusted NTP servers only. Authentication 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:
• 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
To authenticate the message, the client authentication key must match that of the server. The
authentication key must be securely distributed in advance (the client administrator must get the key pair
from the server administrator and configure it on the client).
Task Command
Step 1
Configure the IP address of the NTP server. set ntp server ip_addr
Step 2
Enable NTP client mode. set ntp client enable
Step 3
Verify the NTP configuration. show ntp [noalias]
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