C3750X with IOS 15.0(2)SE6 as a NTP master

[shogo.takeuchi]

Hi All,

Is it possible to configure a C3750X with IOS 15.0(2)SE6 as a NTP master?

The configuration guide for IOS 12.2(55)SE states that it cannot function as an NTP master, but the configuration guide for IOS 15.0(2)SE does not state a NTP master.

- for IOS 12.2(55)SE
http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750x_3560x/software/release/12-2_55_se/configuration/guide/3750xscg/swadmin.html#pgfId-1053923

- for IOS 15.0(2)SE
http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750x_3560x/software/release/15-0_2_se/configuration/guide/3750x_cg/swadmin.html

Thank you,

[Reza Sharifi]

Hi,

According to the link you provided, these switches do not have the hardware support to function as a NTP master.

HTH

[Leo Laohoo]

Is it possible to configure a C3750X with IOS 15.0(2)SE6 as a NTP master?

What do you mean by "NTP master"?  Do you mean that you want the 3750X to act like a stand-alone NTP authoritative?

IF this is the case, then the answer is no (just as Reza has stated) because Cisco appliance do NOT have a built-in "clock".  When left alone the Cisco appliance's electronic clock can/will "drift".  And when the appliance gets rebooted it will NOT retain clock settings.  

[shogo.takeuchi]

Hi Leo,

Thank you for your reply.

I want the 3750X with IOS 15.0(2)SE6 as a NTP server from other devices in the same network if possible.

[Leo Laohoo]

I want the 3750X with IOS 15.0(2)SE6 as a NTP server from other devices in the same network if possible.

The appliance can perform be as a "server" to other devices downstream PROVIDED the appliance gets synchronized to an authoritative server.  

This is what we've done to our PCs, printers, phones, etc.  Our core router synchronizes with an authoritative server out the internet.  Our core switches synch with our core router.  Our distro router/switches synch with our core switch.  Our access switches synch with our distro.  PCs, printers, phones, etc synch with our on-site access switches.