topic NTP in Network Security

NTP

mehnati_1400 — Fri, 21 Feb 2020 09:37:27 GMT

May I know how can configure NTP Server and client in a LAN. We have one Layer 3 Cisco (3560) switch and tree layer 2 ( 2960 ). I want one of them work as NTP server and others NTP client and sync true Time.

Regards.

S.Mehnati

Re: NTP

Jon Marshall — Sun, 29 Jul 2007 11:55:02 GMT

Attached are a couple for links for configuring NTP on both the 2960 and the 3560 switch.

Be aware that the 3560 does not have a hardware clock. This means that you can get your 2960's to get the time off your 3560 but your 3560 needs an external time source to get the time.

2960 NTP configuration

http://www.cisco.com/en/US/products/ps6406/products_configuration_guide_chapter09186a00805a76b9.html

3560 NTP configuration

http://www.cisco.com/en/US/products/hw/switches/ps5528/products_configuration_guide_chapter09186a00805b56d4.html

HTH

Jon

Re: NTP

mehnati_1400 — Sun, 29 Jul 2007 14:41:41 GMT

If hardware clock was not available switch can not keep current time ?

you mean the switch can not work as a NTP server ?

Re: NTP

Jon Marshall — Sun, 29 Jul 2007 15:10:28 GMT

It means the 3560 can be used as an NTP server by the 2960 switches.

But because the 3560 has no hardware clock the 3560 cannot be an NTP master. This means that the 3560 must have a reliable time source from some other device. If you can do this then you can then make the 2960 switches clients of the 3560.

HTH

Jon