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Cisco Bug: CSCvu72416 - Enhance switch object-store to contain the impact of long-time and aggressive fabric port flapping

Last Modified

Aug 27, 2020

Products (22)

  • Cisco Nexus 9000 Series Switches
  • Cisco Nexus 9516 Switch
  • Cisco Nexus 9396TX Switch
  • Cisco Nexus 9396PX Switch
  • Cisco Nexus 93108TC-FX Switch
  • Cisco Nexus 93120TX Switch
  • Cisco Nexus 93108TC-EX Switch
  • Cisco Nexus 9372TX-E Switch
  • Cisco Nexus 9504 Switch
  • Cisco Nexus 9332PQ Switch
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Known Affected Releases


Description (partial)

Triggered by a physical layer issue, such as fiber or a bad transceiver, a link flap may happen every now and then. However, it is uncommon to have continuous flaps when the node is left unattended over an extended period, such as having 688,000 flaps over a year. Each time after the fabric link flaps, one dbgRemotePort managed object is added to the policyElement database. After a long time flapping like this, unexpected memory allocation and access can be triggered for the Nexus OS process, such as policy_mgr or ethpm.

This defect is to enhance the object-store to reduce the impact for such scenarios.

This issue occurs if an uplink port or fabric link has been continuously flapping over a very long time, such as over a year with 688,000 flappings.
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