ntp on 876w

Unanswered Question
Apr 19th, 2009

Could someone tell me how to configure ntp on a 876w ?

My problem is that the router will synch the clock at startup, but at this time the internetconnection is not aviable, because the dialer is not up:

Installed image archive

Cisco 876W (MPC8272) processor (revision 0x300) with 118784K/12288K bytes of memory.

Processor board ID xxxxxxx

MPC8272 CPU Rev: Part Number 0xC, Mask Number 0x10

4 FastEthernet interfaces

1 ISDN Basic Rate interface

1 ATM interface

1 802.11 Radio

128K bytes of non-volatile configuration memory.

28672K bytes of processor board System flash (Intel Strataflash)

Translating "0.de.pool.ntp.org"...domain server ( (

ntp server 0.de.pool.ntp.org prefer source Dialer0


% Invalid input detected at '^' marker.

any help is welcome,


I have this problem too.
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Leo Laohoo Sun, 04/19/2009 - 14:35

For unknown reason, Cisco has disabled NTP on the 850/870 series routers. Use SNTP as an alternative.

sntp server

Hope this answers your question.

kmccourt Sun, 04/19/2009 - 22:19

NTP works on the 870 series. I do not know about the 850 series.

I have it working on an 877 (Advanced IP Services IOS 12.4(15)T8).

To the original poster, try entering the commands as:

conf t

ntp server 0.de.pool.ntp.org


It may not synchronise immediately, but you can check the status with the 'sh ntp status' command, e.g.:

Cisco-877#sh ntp st

Clock is synchronized, stratum 3, reference is

nominal freq is 250.0000 Hz, actual freq is 250.0693 Hz, precision is 2**16

reference time is CD96900A.FBEFC403 (07:09:14.984 BST Mon Apr 20 2009)

clock offset is 1.5630 msec, root delay is 66.79 msec

root dispersion is 30.56 msec, peer dispersion is 1.95 msec

Carsten Radke Fri, 04/24/2009 - 12:52

Sorry, but my router doesn't sync the time.

Cisco IOS Software, C870 Software (C870-ADVSECURITYK9-M), Version 12.4(24)T, REL


The config is:

scheduler max-task-time 5000

sntp server

sntp server

sntp server

sntp source-interface Dialer0

I need it because I use

time-range internet-allg

periodic daily 16:00 to 20:00

periodic Saturday 20:00 to 22:00

periodic Friday 20:00 to 22:00

and every time I reboot the router the date is set to Feb 2002 and the time is I think 2 a clock.

any ideas ?

Leo Laohoo Sun, 04/26/2009 - 15:46

Here's what I use:

A list of the Simple Network Time Protocol (SNTP) time servers that are available on the Internet


NOTE: Although the link contains SNTP sources, I have used the same information for NTP successfully.

Hope this helps.

Carsten Radke Thu, 04/30/2009 - 01:38

Thanks for the information, but it's the same issue. When I reboot the router the year is 2002 and no time-sync will come up.

please help

Edison Ortiz Thu, 04/30/2009 - 05:54


The problem you are having is that you are using a DNS name that needs to be resolved by a DNS server but as you said, the internet isn't up until dialer0 is up.

What you need to do is replace the DNS name with the IP address, by pinging your NTP server, it came back with this IP address ( Use the IP address on the configuration instead of the name (ntp server and let us know how it works out.





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