NTP server - win 2000??

[josaia]

I wish to get my 3750 obtain its clock from a windows 2000 machine.

I've told the switch to get its clock from the win 2000 machine using the command "ntp server XX".

The output of the show ntp status is below:

Clock is unsynchronized, stratum 16, no reference clock

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

reference time is 00000000.00000000 (00:00:00.000 UTC Mon Jan 1 1900)

clock offset is 0.0000 msec, root delay is 0.00 msec

root dispersion is 0.00 msec, peer dispersion is 0.00 msec

and the output for the "show ntp associations" command is:

address ref clock st when poll reach delay offset disp

~10.1.5.252 0.0.0.0 16 - 64 0 0.0 0.00 16000.

* master (synced), # master (unsynced), + selected, - candidate, ~ configured

appreciate any help

[Georg Pauwen]

Hello,

make sure that you can ping the NTP source interface of your switch from te Windows 2000 machine. You might want to try and manually set the source interface with the:

ntp source (e.g. FastEthernet0/1)

command. In this example, NTP sources all packets from FastEthernet0/1, and this interface has to be reachable from the Windows machine.

Also, make sure the Windows Time service is started on your Windows machine.

Regards,

GP

[josaia]

Thanks GP,

I've added the following to my configs:

1) "ntp source gigabitethernet x" command

And on the gigabitethernet interface x:

2) "no switchport"

3)and "ip address xxx"

I can ping either way(win 2000 machine to 3750 and vice versa)

the output of "show ntp associations" is now:

Switch#sh ntp associations

address ref clock st when poll reach delay offset disp

~10.1.5.252 10.1.2.8 2 21 512 377 0.9 355716 4.6

* master (synced), # master (unsynced), + selected, - candidate, ~ configured

and the output for the "show ntp status" command is:

Switch#sh ntp status

Clock is unsynchronized, stratum 16, no reference clock

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

reference time is 00000000.00000000 (00:00:00.000 UTC Mon Jan 1 1900)

clock offset is 0.0000 msec, root delay is 0.00 msec

root dispersion is 0.00 msec, peer dispersion is 0.00 msec

what could I be missing??

thanks for any help

[Georg Pauwen]

Hello,

weird indeed...can you post the output of:

debug ntp events

Also, which IOS version are you running ? It might be a bug...

Do you have any access lists configured on the path to the Windows machine ? Or are there firewalls in between ?

Regards,

Georg

[josaia]

Georg,

My 3750 runs IOS version 12.1(19)EA1c.

No access lists or firewalls in between.

I've turned on "debug ntp events" but am getting no output.

[josaia]

Georg,

My 3750 runs IOS version 12.1(19)EA1c.

No access lists or firewalls in between.

I've turned on "debug ntp events" but am getting no output.

[smif101]

Are you running the windows 2000 Time Server service. If so, it requires Kerberos Authentication and the cisco router will not be able to get time from it. Do you have other cisco devices recieving time from this server or just computers in the domain? If you need to get accurate time I would recommend getting a seperate GPS time server?

Jason Smith

www.smif101.com

[josaia]

Thanks Jason,

I'm running win 2000 time service.

No other cisco devices get their time from this win 2000 machine. I'm basically trying to see whether NTP can work with a 3750 switch getting its clock from the win 2000 machine.

I followed instructions from the Windows .Net magazine site.(about 6 steps to configure).

That seems like the only easy part of configuring NTP.

Thanks for the offer but I'd like to keep it as simple as possible and try getting the 3750 obtain its clock from win 2000 before I venture into deeper waters.

Thanks

[neonetsup]

Just browsing the subjects; Stumbled across this one knowing it's 7 months old:

Try Installing Tardis on the 2000 server.

Point the 2000 server to a time source

Point the switch to the 2000 servers IP

Should sync.

[carlogon]

hi, any IOS is fully based on the RFC for NTP however windows OS are not fully compatible they use SNTP , thus the ios wont be able to synchonize to any windows boxes, try to get synchronize to unix box or another IOS box

here is a link with public ntp servers

http://www.eecis.udel.edu/~mills/ntp/clock1a.html

PD catos are SNTP based so they can get sycn with windows

[andrew.butterworth]

Best thing is to sync a Cisco IOS box off a real NTP source and then sync your Windows 2000 server off this

Andy

[josaia]

Thanks everyone for your input.

I managed to solve this issue in a different thread some time in October 2004.My apologies for not letting you know about this earlier.

Summarised below is what I did:

1)configured 2651 router(which acts as our core WAN router) to act as ntp source(instead of win 2000 as I earlier wanted) using the "ntp master" command

2)pointed our LAN switches to the 2651 router(ntp source) with the command "ntp server a.b.c.d".

3)pointed our remote WAN routers to our ntp source with the command "sntp server a.b.c.d"

where a.b.c.d is ntp source IP address.

Try the link below(hope it works) if you wish to see how I went about it:

http://forums.cisco.com/eforum/servlet/NetProf?page=netprof&CommCmd=MB%3Fcmd%3Dpass_through%26location%3Doutline%40%5E1%40%40.1dd67761/1#selected_message">Click here/A>

thanks