Known leap second problems

The leap second is less than two days away. The NTP Pool system will monitor (as always) the servers in the pool and remove servers that divert in time. In past years a small number of servers would be off by a second for a few hours (or sometimes a few days) after the leap second insertion.

Red Hat published a list of known leap second issues in (Red Hat) Linux.

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Various Cisco IOS-XE and NXOS issues exist which impact ASR 1K and Nexus router/switch platforms.

Recommendation is to upgrade software, or disable NTP at least 24 hours prior to the leap second event.

A good place to start: