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CONTAP-143699: Disruption due to management packet reference count wrap-around

  1. Last updated
    Apr 24, 2025
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ontap-9
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core
Last Updated:
4/24/2025, 12:59:22 PM

Issue

Due to a logic error, internal network references counts are not cleared on interfaces used by management traffic (e.g. ZAPI, ASUP, SNMP, etc.), NDMP traffic, or other internal communication traffic. Eventually this results in a wrap-around of a 32bit reference counter.
After ~4 billion (2^32) management control plane packets are output on a single interface, an unplanned storage system HA takeover will occur for systems in an HA configuration. In the case of a single storage controller configuration, this issue will result in a disruption of service.
Data plane traffic (e.g. NFS, CIFS, and iSCSI) and non-IP traffic do not impact these network reference counts.
This issue impacts both Data ONTAP 7-Mode and clustered Data ONTAP.

 

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