Field Notice: FN - 64244 - December 31, 2016 Leap Second Impact to Voice and Unified Communications Devices

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Updated:January 11, 2017
Document ID:FN64244

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Revision History

Revision Date Comment
1.1
11-JAN-2017
Posted to Additional Product Pages on Cisco.com
1.0
22-DEC-2016
Initial Public Release

Products Affected

Products Affected
Cisco Finesse - 11.5(1), 11.0(1), 10.5(1), 10.0(1), 9.1(1), 9.0(1)
Cisco Unified Intelligence Center - 11.5(1), 11.0(1), 10.5(1), 10.0(1), 9.1(1)
 Cisco Virtualized Voice Browser - 11.5(1), 11.0(1)
MediaSense - 11.5(1), 11.0(1), 10.5(1), 10.0(1), 9.1(1)
SocialMiner - 11.5(1), 11.0(1), 10.6(1)
Unified Contact Center Express IP IVR - 11.5(1), 11.0(1), 10.6(1), 10.5(1), 10.0(1), 9.0(2)
Cisco Identity Service (IdS) 11.5(1)
Cisco Live Data 11.5(X), 11.0(X), 10.5(X), 10.0(X)

Problem Description

An addition of one second to Universal Coordinated Time (UTC) causes the system clock used by the kernel to be out of sync with UTC by a second. The tzdata file can be updated in order to fix this issue.

Background

The U.S. Naval Observatory announced that a leap second will be added again on December 31, 2016 at 23:59:60 UTC. That means your day and year will officially be one second longer.

Problem Symptoms

The impact will be on reporting and other cron jobs scheduled on the server.

Impacts of Leap Second

  • Impact to kernel - The leap second vulnerability detector script published by RedHat has exposed the kernel to be vulnerable and the impact could be none to as high as a kernel crash during the leap second transition period.
  • Impact to application - Anomalies in reporting (could be a day off on scheduled reports) and scheduled cron job anomalies.

Workaround/Solution

All defects listed are an amendment to Leap Second Guide, Product Information, Voice and Unified Communication Devices.

Workarounds

Option 1

Turn off the server at the transition time of the leap second so the server kernels do not get impacted at the transition point. However, after this action there will be a one second drift with UTC permanently that will continue to exist.

Option 2

Break the connection with NTP before the leap second and restore it after the leap second. This could affect clustering and database replication.

Solution

Apply the leap second Cisco Options Package (COP) file posted in CCO for each of these versions for all the components. This COP file updates the tzdata to the latest version, 2016g and later, that has the fix for leap second 2016.

Product Version Location of Leap Second Fix CDETS
Unified Contact Center Express/IVR 9.0(2), 10.0(1):
Location

10.5, 10.6, 11.0, 11.5:
Location		 CSCvc22335
SocialMiner Location CSCvc22333
Cisco Unified Intelligence Center (CUIC) Location CSCvc22332
Cisco Virtualized Voice Browser (CVVB) Location CSCvc22338
Cisco Finesse Location CSCvc22336
Cisco Live Data Location CSCvc22332
Cisco IdS Location CSCvc22332
MediaSense Location CSCvc22337

CDETS

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

CDETS Description
CSCvc22335 (registered customers only) TZData Update for 2016g Changes and 2016 Leap Second
CSCvc22333 (registered customers only) TZData Update for 2016g Changes and 2016 Leap Second
CSCvc22332 (registered customers only) TZData Update for 2016g Changes and 2016 Leap Second
CSCvc22336 (registered customers only) TZData Update for 2016g Changes and 2016 Leap Second
CSCvc22337 (registered customers only) TZData Update for 2016g Changes and 2016 Leap Second
CSCvc22338 (registered customers only) TZData Update for 2016g Changes and 2016 Leap Second

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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