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Cisco Bug: CSCui93730 - Clock is not matching after adding leap second in ASR

Last Modified

Oct 14, 2019

Products (17)

  • Cisco IOS
  • Cisco ASR 901-6CZ-F-D Router
  • Cisco ME 3600X-24TS-M Switch
  • Cisco ASR 901-4C-FT-D Router
  • Cisco ASR 901-6CZ-F-A Router
  • Cisco ASR 901-6CZ-FT-A Router
  • Cisco ASR 901-12C-FT-D Router
  • Cisco 7600 Series Route Switch Processor 720 with Multilayer Switch Feature Card
  • Cisco 7600 Series Route Switch Processor 720 with 10 Gigabit Ethernet Uplinks
  • Cisco ME 3600X-24CX-M Switch
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Known Affected Releases

15.0(12.79)EZD 15.0(13.26)EZD 15.2(2.2.98)E 15.2(4)S4.21 15.3(3)S 15.3(3)S0.8 15.3(3)S1.12 15.3(3)S2.9 15.3(3)S3.13 15.3(3)S4.12 15.4(0.17)S 15.4(0.19)S0.11 15.4(0.19)S0.3 15.4(0.19)S0.8 15.4(1)S1.8 15.4(1)S2.22 15.4(1.1)STS 15.4(1.6)S

Description (partial)

There are periodic leap second events which can add or delete a second to global time. 

When the leap second update occurs the leap second is not added properly in NTP server of ASR1k . 
i.e, 23.59.59 is not appearing twice in ntp master of ASR1k
The  one second time difference is identified by comparing UNIX machine time clock in unix  machine and ASR1K NTP master not matching when leap second occurs. This means the time difference should be in range of   1000 ms/ 1second( or +/-200ms deviation is tolerance limit). This is not happening. Time difference is more than 1200 ms.

The leap second update will be propagated via Network Time Protocol (NTP) only from ntp masters with GPS receivers or "ntp lead add" CLI configured in ntp master.
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