What they mean is that when you copy your NTP configuration to other devices, don't include the ntp clock-period command. This is an automatically generated command that helps the router sync and stay sync'd in case it looses connectivity to the main NTP server. Each router will have a clock frequency that is slightly different. This value is specific to each router, and it tells the router how *off* its clock is and how often it should adjust what time the clock says it is to stay in time with the actual time.
If you delete the command from a router, you will see that it will show back up. If you add it to a router that it wasn't generated on, you will instruct that router to change its clock incorrectly. Think of it this way. 2 people , each have a watch on. Each are talking to me ( a person with a very accurate watch ) Person A has a watch that looses 1 minute every hour. Person B has a watch that gains 1 minute every hour. Both people compare their clock to mine and notice that their watch is drifting from my clock, which is a clock they consider accurate. Each make a mental note to adjust their watch every hour , either adding a minute for Person A, or subtracting a minute for person B. Now, they know that if they do this, even if they don't talk to me for days that when we do talk our watches will be sync'd. Now, Person A doesn't know how to adjust his watch so he asked person B, who says " subtract a minute every hour ". While subtracting a minute is correct for person B, it will cause person A to loose 2 minutes every hour, thus getting away from sync very quickly. Hope this helps Thanks Larry -----Original Message----- From: Tony Chen [mailto:tonychen@;ballfoundation.org] Sent: Monday, November 04, 2002 10:26 AM To: [EMAIL PROTECTED] Subject: configuring NTP [7:56811] I found the reference to the NTP command which states the need to remove one of the commands when copying the config file (I still don't fully understand why): ===================================================== Caution The ntp clock-period command is automatically generated to reflect the constantly changing correction factor when the copy running-configuration startup-configuration command is entered to save the configuration to NVRAM. Do not attempt to manually use the ntp clock-period command. Ensure that you remove this command line when copying configuration files to other devices. ===================================================== If anyone know why do they suggest to remove this command, please explain. I thought the start-up config is only passively stored in the NVRAM and waiting to be copy to running-config. Tony Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=56815&t=56811 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
