Upcoming time change

Unanswered Question
Oct 30th, 2008
User Badges:

Hello folks -


I have a question about the upcoming Daylight Savings time change this weekend.


If I configure my routers to synchronize time using an external NTP Server, do I still need the following command configured:


clock summer-time CST recurring 2 Sun Mar 2:00 1 Sun Nov 2:00


I know I still need the following:


clock timezone CST -6


Also, I read somewhere that Cisco routers loose time and date information when rebooted? Is that correct?


Thanks for your help!!

  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 0 (0 ratings)
Loading.
Joseph W. Doherty Thu, 10/30/2008 - 16:23
User Badges:
  • Super Bronze, 10000 points or more

re: "Also, I read somewhere that Cisco routers loose time and date information when rebooted? Is that correct?"


Some do, the more powerful models and many of the newer models have on-board clocks. However, the on-board clocks can have inaccurate time, but you can have NTP update them too. (Command is something like "ntp update-calandar")

ksarin123_2 Thu, 10/30/2008 - 16:36
User Badges:

What do you mean by "on-board clocks have inaccurate time?"


What if you set the time manually?

Joseph W. Doherty Thu, 10/30/2008 - 16:53
User Badges:
  • Super Bronze, 10000 points or more

Setting either clock manually is fine, but they often "drift". (I.e. gain or lose time each day. One reason for NTP.)


PS:

Also note, the on-board clock I have in mind is the calendar clock, not the since bootup running clock. Again, the former isn't available on all Cisco devices. (Commands, I recall, to see each are "show clock" vs. "show calendar".)

ksarin123_2 Thu, 10/30/2008 - 17:04
User Badges:

Thanks for your reply.


Do you know why do the clocks drift if set manually?

Actions

This Discussion