Specifications

4-9
System Management Software Configuration Guide for Cisco IE 2000U and Connected Grid Switches
Chapter 4 Administering the Switch
Configuring NTP
DETAILED STEPS
You need to configure only one end of an association; the other device can automatically establish the
association. If you are using the default NTP version (Version 3) and NTP synchronization does not
occur, try using NTP Version 2. Many NTP servers on the Internet run Version 2.
To remove a peer or server association, use the no ntp peer ip-address or the no ntp server ip-address
global configuration command.
EXAMPLE
This example shows how to configure the switch to synchronize its system clock with the clock of the
peer at IP address 172.16.22.44 using NTP Version 2:
Switch(config)# ntp server 172.16.22.44 version 2
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
ntp peer ip-address [version
number] [key keyid] [source
interface] [prefer]
or
ntp server ip-address [version
number] [key keyid] [source
interface] [prefer]
Configure the switch system clock to synchronize a peer or to be
synchronized by a peer (peer association).
or
Configure the switch system clock to be synchronized by a time
server (server association).
No peer or server associations are defined by default.
• For ip-address in a peer association, specify either the IP
address of the peer providing, or being provided, the clock
synchronization. For a server association, specify the IP
address of the time server providing the clock
synchronization.
• (Optional) For number, specify the NTP version number. The
range is 1 to 3. By default, Version 3 is selected.
• (Optional) For keyid, enter the authentication key defined
with the ntp authentication-key global configuration
command.
• (Optional) For interface, specify the interface from which to
pick the IP source address. By default, the source IP address
is taken from the outgoing interface.
• (Optional) Enter the prefer keyword to make this peer or
server the preferred one that provides synchronization. This
keyword reduces switching back and forth between peers and
servers.
Step 3
end Return to privileged EXEC mode.
Step 4
show running-config Verify your entries.
Step 5
copy running-config
startup-config
(Optional) Save your entries in the configuration file.