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Cisco Bug: CSCut81357 - PTP Leap Second : n5k ptp off clock off by 35 seconds

Last Modified

Sep 09, 2019

Products (1)

  • Cisco Nexus 5000 Series Switches

Known Affected Releases

6.0(2)

Description (partial)

Symptom:
There are periodic leap second events which can add or delete a second to global time. The leap second event can be propagated via Precision Time Protocol (PTP) if configured.

When the leap second update occurs and the device is configured to use PTP as a Boundary Clock (BC) then an incorrect Coordinated Universal Time (UTC) offset and PTP Leap Indicator could propagate incorrect time downstream. This could cause the PTP network time to be off as much as thirty five seconds.

Conditions:
The leap second update is propagated from the configured PTP Grandmaster clock.

A Cisco device running the PTP protocol would have the "feature ptp" command in the running configuration.

Related Community Discussions

NX-OS におけるうるう秒の対応
うるう秒について 2017年1月1日にうるう秒の調整が実施されます。 日本標準時では、2017年1月1日の午前8時59分59秒と午前9時00分00秒の間に8時59分60秒が追加されます。 ※うるう秒については、後述の補足を参照してください。   NX-OS におけるうるう秒の対応 NX-OS では、NTP の Leap Indicator(LI) による、うるう秒の追加・削除に対応しており、NTP serverから受け取ったLI bitの立ったNTPパケットは正常に同期され8時59分59秒を2回繰り返します。   対象機器 Nexus/9000/7000/6000/5000/3000 series switch うるう秒の追加・削除時に出力されるログ 8時59分59秒を2回繰り返す挙動となりますが、これに伴い出力されるログはありません。   影響 各プロダクトごとに以下の不具合が報告されております。 Cisco Nexus 3000 Series Switches CSCut43397  CSCui37256 (PTP)  Cisco Nexus 5000 Series Switches ...
Latest activity: Apr 10, 2015
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