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New Member

NTP Server Time is increase after 24 HRs as one minute

Dear Sir

I have a cluster of 3750x switches, which are in stack ( 2 two 3750 switches in each stack) between the stack port channel configured.

3750x stack used as core switches. and the core switch has configured as NTP server. But the issue that After 24 Hrs NTP server increased the one minutes.

configuration of NTP server

ntp logging
ntp source Vlan1090
ntp master
mac address-table notification mac-move

show version

Cisco IOS Software, C3750E Software (C3750E-UNIVERSALK9-M), Version 15.0(2)SE9, RELEASE SOFTWARE (fc1)
Technical Support:
Copyright (c) 1986-2015 by Cisco Systems, Inc.
Compiled Tue 01-Dec-15 06:19 by prod_rel_team

ROM: Bootstrap program is C3750E boot loader
BOOTLDR: C3750E Boot Loader (C3750X-HBOOT-M) Version 12.2(58r)SE1, RELEASE SOFTWARE (fc1)

DIAL-AEROCITY-CS-01 uptime is 49 weeks, 4 days, 21 hours, 35 minutes
System returned to ROM by power-on
System restarted at 14:49:35 IST Thu May 5 2016
System image file is "flash:c3750e-universalk9-mz.150-2.SE9.bin"

Please do the needful.


raj singH

Hall of Fame Super Gold

No Cisco appliances can be an

No Cisco appliances can be an independent authoritative NTP time source.  

The core switch needs to be synchronized to an authoritative NTP time source in order to keep the correct time and date.

New Member



I have configured these command on the switch could u help to if the configuration is correct. could you provide the NTP Server configuration as sample.  Or synchronized to an authoritative NTP time source

I am very thankful to you.

service timestamps debug datetime msec localtime show-timezone
service timestamps log datetime msec localtime

thanks and regard

raj singh




You need to configure your core switches to sync with an external time source,

ntp server x.x.x.x

x.x.x.x is the ip address of an external ntp server on the Internet. Resolve to get an ip address you can use for x.x.x.x

Hope this helps



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