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In 2007 the dates to change to DST are changing. While there is reference to some products changing, I haven't seen any reference to any IOS upgrade to take this into consideration. Am I missing something? If not you will have to go to every router to change the config.
With the new change in DST coming up, modifying the IOS is certainly in the works. I received a memo from our corporate IT department a few weeks back that advised that the dates are changing next year and that Microsoft and Cisco were mentioned that upgrades were pending, so am sure they will no doubt have something come out at the last minute!
There may be no need for you to upgrade! Check out the command reference for clock summer-time: http://www.cisco.com/en/US/products/sw/iosswrel/ps5187/products_command_reference_chapter09186a008017d030.html#wp1033365
You can manually specify the start and end days or dates of DST in the configuration.
From Cisco's examples on that page:
The following example specifies that summer time starts on the first Sunday in April at 2 a.m. and ends on the last Sunday in October at 2 a.m.:
Router(config)# clock summer-time PDT recurring 1 Sunday April 2:00 last Sunday October 2:00
If you live in a place where summer time does not follow the pattern in the first example, you can specify the exact date and times. In the following example, daylight saving time (summer time) is configured to start on October 12, 1997 at 2 a.m., and end on April 26, 1998 at 2 a.m.:
Router(config)# clock summer-time date 12 October 1997 2:00 26 April 1998 2:00
You can manually specify the start and end days or dates of DST in the configuration.
From Cisco's examples on that page:
The following example specifies that summer time starts on the first Sunday in April at 2 a.m. and ends on the last Sunday in October at 2 a.m.:
Router(config)# clock summer-time PDT recurring 1 Sunday April 2:00 last Sunday October 2:00
If you live in a place where summer time does not follow the pattern in the first example, you can specify the exact date and times. In the following example, daylight saving time (summer time) is configured to start on October 12, 1997 at 2 a.m., and end on April 26, 1998 at 2 a.m.:
Router(config)# clock summer-time date 12 October 1997 2:00 26 April 1998 2:00
Just use the "clock summer-time" command with parameters to manually set this on your switches/routers. I'll be using Kiwi CatTools to do this for me! 
In case anyone else is waiting until the last minute, Chris' solution is perfect, but the second router config statement is missing the timezone, which annoyed IOS 12.4.
Router(config)#clock summer-time date 11 March 2007 2:00 4 November 2007 2:00
The above statement will take care of 2007.
Router(config)#clock summer-time date 11 March 2007 2:00 4 November 2007 2:00
The above statement will take care of 2007.
You might want to avail yourself of this opportunity to cut your networking gear over to Universal Time. Thanks for pointing this issue out. IT professionals worldwide need to be cognizant of the DST2007 problem, especially if your organization, your organizations customers, or your partners have a physical or electronic presence in the United States or Canada. There is a small but growing body of information available online to help address the DST2007 problem. For example, there is a tool available at sharpebusinesssolutions.com/dst2007.htm to help with one of the toughest parts of the problem - unsupported versions of Microsoft Windows.
What negative effects if any, could having the time zone set to CST instead of GMT on a PIX or router cause?
thanks
thanks
Setting the time to the local time eliminates confusion. People know what EST is, a lot don't know what GMT or UTC is or how many hours different it is from local time. In addition, GMT does not change like DST does: right now GMT is five hours different but last week it was four hours different.
If you are trying to catch a hacker you might want to know what time they were attacking. So if your time settings aren't right you won't know when the intrusion happened.
its good info. how to troubleshoot what happen when time is reset to default (1st jan 2000). what could be the possible reason.
is the daylight saving time a necessary step to be configured. bcus i don't really understand it.
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