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Cisco Bug: CSCvs57186 - Excessive number of ARP request generated after l3out Link Flapping

Last Modified

Aug 28, 2020

Products (24)

  • Cisco Nexus 9000 Series Switches
  • Cisco Nexus 9516 Switch
  • Cisco Nexus 9396PX Switch
  • Cisco Nexus 9396TX Switch
  • Cisco Nexus 93108TC-FX Switch
  • Cisco Nexus 93120TX Switch
  • Cisco Nexus 93240YC-FX2 Switch
  • Cisco Nexus 9504 Switch
  • Cisco Nexus 9332C Switch
  • Cisco Nexus 93108TC-EX Switch
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Known Affected Releases


Description (partial)

After a link to a Cisco ACI leaf switch flaps, ARP continuously refreshes, and unicast traffic to a neighboring device is non-functional. In a packet capture, the leaf switch continuously sends ARP requests for the neighboring device, even though that device is sending ARP responses. When running "show ip arp vrf tenant:vrf", the age of the ARP entry is always 0 seconds.

Link to a Cisco ACI leaf switch's front panel port (server/host facing port) flaps.

This defect is extremely rare. If you think you are hitting this defect, contact Cisco TAC for further assistance and verification.
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