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Introduction
In August of 2005 the United States Congress passed the Energy Policy Act, which changes the dates of both the start and end of daylight saving time (DST). When this law goes into effect in 2007, DST will start three weeks earlier (2:00 A.M. on the second Sunday in March) and will end one week later (2:00 A.M. on the first Sunday in November) than what had traditionally occurred.
Because many calendar environments have an interconnected system of applications, each environment must be adjusted to accommodate the new DST rules. The DST change affects all devices that support an automatic time change when they are configured to support Daylight Saving Time. Customers should contact any vendor that uses time-sensitive messaging or other time-stamped communications in order to determine the impact of the Energy Policy Act.
Cisco Components: To update Cisco components, please access http://www.cisco.com.
Microsoft Components: To update Microsoft Windows components, please access http://www.microsoft.com/windows/timezone/dst2007.mspx.
General sequence of update actions and special considerations
Affected devices that are not changed could display the time exactly 1 hour off from the actual time during DST periods in spring and fall. In 2007, DST starts three weeks earlier and ends one week later than in past years. This change takes effect for the first time in March of 2007. This change can have a major impact on event correlation activities that are performed as part of normal operations troubleshooting and monitoring.
For security-related devices, where logs are captured, correlated, and stored for future reference, this time change could render them incorrect for situations where they need to be recalled to rebuild a sequence of events. The incorrect timestamps might not be an issue for events that get immediate action. However, in the future, these events would reference incorrect times.
Any device with time-based controls and activities, such as an AAA servers, Content Devices (CEs), cron jobs, and video streaming servers can be impacted and should be checked with the appropriate vendor.
For more information contact us at 877-780-1132 or mailto:%20sales@covetrix.com. |
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