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Community Member

NTP on 3750 Switch

Hi Guys, I'm trying to set my 3750 switch as an NTP server so that the surrounding network devices take time from it. I notice though when i add the 3750 as an NTP server on another switch, it does not sync although they are directly connected.

How do i verify that my 3750 is capable of pulling time from the internet, then serving as a host? (it doesnt support the NTP master command - although i will not use it)

this is my switch version outpu:

Cisco IOS Software, C3750 Software (C3750-IPSERVICES-M), Version 12.2(25)SEE2, RELEASE SOFTWARE (fc1)

Copyright (c) 1986-2006 by Cisco Systems, Inc.

Compiled Fri 28-Jul-06 08:46 by yenanh

Image text-base: 0x00003000, data-base: 0x010CE290


Re: NTP on 3750 Switch

Hi See configuration below..

*****For the Client*****

clock timezone EST -5 ????

ntp source loopback 0 ?????

ntp server ip_address key 1

!--- For the server:

clock timezone EST -5

clock summer-time EDT recurring 1 Sun Apr 3:00 last Sun Oct 3:00

clock calendar-valid

ntp source loopback0

ntp update-calendar

!--- This sends NTP broadcast packets.

ntp broadcast client

!--- This receives NTP broadcast packets.

Community Member

Re: NTP on 3750 Switch

Hi Satish, thanks for your response. but half of those commands are not supported on my Switch.

Community Member

Re: NTP on 3750 Switch


You can verify the ntp is configurated successfully through the 'show ntp sta'..

for example:

DWTL_7F_3560#show ntp status

Clock is synchronized, stratum 4, reference is

nominal freq is 119.2092 Hz, actual freq is 119.2087 Hz, precision is 2**18

reference time is CC68AC26.75F29A0E (14:24:38.460 BeiJing Wed Sep 3 2008)

clock offset is 5.2167 msec, root delay is 290.73 msec

root dispersion is 106.69 msec, peer dispersion is 11.32 msec

DWTL_7F_3560#show clock

DWTL_7F_3560#show clock

14:25:22.872 BeiJing Wed Sep 3 2008


Community Member

Re: NTP on 3750 Switch

Thank your Wangyb, i am aware of those commands. My 3750 is currently sycing time.

But when i config my 3560 to use the 3750 as the ntp server it does not sync when i do a #sh ntp ass

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