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Cisco MGX 8880 Media Gateways

Field Notice: FN - 62702 - U.S. Daylight Savings Time Policy Changes Effective March 2007 - For MGX, IGX, and BPX Platforms


March 5, 2007

NOTICE:

THIS FIELD NOTICE IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTY OF MERCHANTABILITY. YOUR USE OF THE INFORMATION ON THE FIELD NOTICE OR MATERIALS LINKED FROM THE FIELD NOTICE IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS FIELD NOTICE AT ANY TIME.


Products Affected

Products Affected

Comments

BPX Series

Not Affected

Cisco Transport Manager (CTM)

Please refer to Related Field Notices section of this notice.

Cisco WAN Manager (CWM)

Please refer to Related Field Notices section of this notice.

IGX Series

Not Affected

MGX 8220 (AXIS)

Not Affected

MGX with PXM1

Not Affected

MGX with PXM45 or PXM1E

Not Affected

RPM-PR or RPM-XF

Please refer to Related Field Notices section of this notice.

SES

Not Affected

Problem Description

New U.S. Daylight Savings Times rules go into effect in March 2007.

This notice is intended to both alert you to what impact the DST change may have on the Cisco MGX Media Gateway and the Cisco MGX, IGX and BPX series multiservice switches. This notice details the necessary remedial steps to ensure consistent and seamless product operation. Customers deploying these product and configuration options should follow the steps outlined in the notice to ensure they avoid encountering problems with the March 2007 US/Canada DST transition.

The Cisco MGX Media Gateway and the MGX, IGX, and BPX platforms are Not Directly Affected by this change because time settings and changes are done manually for these platforms. Operator intervention is required to change the time settings.

Some customers have platforms that run Cisco IOS based code on plug in modules within these families of products and they may also use certain software such as Cisco WAN Manager (CWM)/ Cisco Transport Manager (CTM) to manage their networks. Platforms that use these products CAN be affected by the new Daylight Savings rules.

For systems that have not been updated with the new U.S. / Canada DST policy changes, timestamps will exhibit a one hour time clock offset lasting three weeks beginning at 2:00 A.M. on the second Sunday in March of 2007. They will also exhibit a one hour time clock offset lasting one week beginning at 2:00 A.M. on the first Sunday in November.

Any time-dependent applications not running the upgrade or workaround will be affected by this problem.

For Example:

System logs will be off by one hour

Time based routing will be off by one hour

Background

On August 8, 2005, the Energy Policy Act of 2005 (H.R.6.ENR), was signed into law. Section 110 of this Act modified the time change dates for Daylight Saving Time (DST) in the U.S.

Beginning in March of 2007, DST will begin on the second Sunday of March and end the first Sunday of November.

For 2007 and beyond, the daylight saving time period will be:

2:00 A.M. on the second Sunday in March

to

2:00 A.M. on the first Sunday in November

For more information on the Energy Policy Act of 2005, see H.R. 6. (See Section 110)

Problem Symptoms

Impact to Networking Systems

Networking systems often make use of local time to mark logs, as well as to schedule certain events, such as IP SLA schedule starts, or the beginning or end of a time-based access-list.

In addition, inconsistencies between time zone definitions may impact event correlation systems as well as other management systems relating to problem escalation. Having accurately represented local time is a very big concern for most organizations. Local time may be reflected in logs and on phone displays. This is especially true of systems that require accurate time and time stamping for proper operations.

For networking systems, the clock or clock source is often derived from a trusted chronological source such as a private or public Atomic clock, often through Network Time Protocol (NTP). NTP communicates time in Coordinated Universal Time (UTC), colloquially known as GMT, and thus is not impacted, nor is a workaround for statutory time zone changes. Local time definitions, including summertime settings are part of the configuration of most Cisco products.

Network Time Protocol (NTP) Implications

Regardless of whether or not network components are configured to use differing clock sources such as UTC and NTP, networks will be affected when clock summer-time commands are enabled with incorrect parameters.

Workaround/Solution

Cisco MGX with PXM45 or PXM1E, MGX with PXM1, BPX, IGX, AXIS:

These products do not currently have any automatic support for daylight savings and therefore will not be impacted by the DST changes. When the time changes, the user must manually configure the new time using the following CLI commands:

fn62702_jd5sqw.jpg

DDTS

To follow the bug ID link below and see detailed bug information, you must be a registered user and you must be logged in.

DDTS

Description

CSCsg70355 (registered customers only)

Adopt new default summer-time rules from Energy Policy Act of 2005

Related Field Notices

IOS Field Notice

Field Notice: FN - 62613 - U.S. Daylight Savings Time Policy Changes Effective March 2007 - for Cisco IOS Software

CWM Field Notice

FN - xxxxx - U.S. Daylight Savings Time Policy Changes Effective March 2007 - for Cisco Wan Manager Software

Note: CWM Field Notice number will be updated when available.

Revision History

Revision

Date

Comment

1.0

05-MAR-2007

Initial Public Release

For More Information

If you require further assistance, or if you have any further questions regarding this field notice, please contact the Cisco Systems Technical Assistance Center (TAC) by one of the following methods:

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