The router is a 2811 Cisco ISR, it has the following configuration regarding its clock settings:
clock timezone eastern -5
clock summer-time eastern recurring
Here is the current time on the router:
*10:10:41.235 eastern Sun Feb 17 2008
The actual time is 10:04
Setting the clock on the router can correct the time setting, currently this router is fast by about six minutes
*10:14:35.055 eastern Sun Feb 17 2008
Certchaser#clock set 10:09:00 february 17 2008
*Feb 17 15:09:00.000: %SYS-6-CLOCKUPDATE: System clock has been updated from 10:15:23 eastern Sun Feb 17 2008 to 10:09:00 eastern Sun Feb 17 2008, configured from console by console.
10:09:08.659 eastern Sun Feb 17 2008
After a reload the router returns to its incorrect time settings, this was verified by writing the config and reloading the router, then comparing to the current time on a PC. This router has a hardware clock, changing the software clock on the router does not update the hardware clock. The command to update the hardware clock is clock update-calendar The hardware clock can be displayed with the command show calendar
10:27:10.159 eastern Sun Feb 17 2008
10:27:14 eastern Sun Feb 17 2008
Certchaser#clock set 10:21:00 february 17 2008
Feb 17 15:21:00.000: %SYS-6-CLOCKUPDATE: System clock has been updated from 10:27:36 eastern Sun Feb 17 2008 to 10:21:00 eastern Sun Feb 17 2008, configured from console by console.
10:21:19.083 eastern Sun Feb 17 2008
10:21:27 eastern Sun Feb 17 2008
Sunday, February 17, 2008
Synchronizing the Software Clock to the Hardware Clock on a Cisco Router
Posted by Bryan Baize at 10:27 AM
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