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Cisco Bug: CSCut42416 - Sup reload or Switchover may occur due to Leap second update

Last Modified

Dec 29, 2016

Products (1)

  • Cisco Virtual Security Gateway for Nexus 1000V Series Switch

Known Affected Releases

5.2(1)VSG2(1.1) 5.2(1)VSG2(1.1b)

Description (partial)

Symptom:
There are periodic leap second events which can add or delete a second to global time. When the leap second update occurs the following could be observed; 

1. Active VSG resets. Standby VSG switches over and becomes active. The previous active now comes up as Standby.
2. No core files for the failed VSG.

Conditions:
The leap second update will be propagated via Network Time Protocol (NTP) or via manually setting the clock.

The VSG may hit a Kernel livelock under the following 2 conditions:

  1. When the NTP server pushes the update to the VSG NTPd client, which in turn schedules the update to the Kernel. This push should have happened 24 hours before June 30th 2015, by most NTP servers.
  2. When the NTP server actually updates the clock 1 minute before the UTC time.
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