Set the NTP Server Address on the Cisco Ethernet Switch

To set the NTP server on the Cisco Ethernet switch:

1. Open a connection to the Ethernet switch using SSH, and log in as admin. If SSH is not configured, then use Telnet.
2. Change to enable mode.

   Switch> enable
   

3. Review the current configuration:

   Switch# show running-config
   

4. Erase the current chrony/NTP server configuration and any invalid NTP addresses. In the following example, the current IP addresses are 10.10.10.1 and 10.8.8.1.

   Switch# configure terminal
   Enter configuration commands,one per line. End with CNTL/Z.
   Switch(config)# no ntp server 10.10.10.1
   Switch(config)# no ntp server 10.8.8.1
   Switch(config)# end
   Switch# write memory
   Building configuration...
   Compressed configuration from 2603 bytes to 1158 bytes [OK ]
   

5. Configure up to two NTP servers. The following example uses 10.7.7.1 and 10.9.9.1 as the new IP addresses:

   Switch# configure terminal
   Enter configuration commands,one per line. End with CNTL/Z.
   Switch(config)# ntp server 10.7.7.1 prefer
   Switch(config)# ntp server 10.9.9.1
   Switch(config)# end
   Switch# write memory
   Building configuration...
   Compressed configuration from 2603 bytes to 1158 bytes [OK ]
   

6. Verify the changes:

   Switch# show running-config
   
   Building configuration...
   ...
   ntp server 192.168.10.10 prefer
   ...
   

7. Save the configuration:

   Switch# copy running-config startup-config
   Destination filename [startup-config]? 
   Building configuration...
   Compressed configuration from 14343 bytes to 3986 bytes[OK]
   

8. Exit from the session:

   Switch# exit