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Cisco Bug: CSCvt64733 - ARP request looped due to RW-TCAM bd_label misprogrammed on spine causing ACL miss

Last Modified

Oct 03, 2020

Products (24)

  • Cisco Nexus 9000 Series Switches
  • Cisco Nexus 9516 Switch
  • Cisco Nexus 9396PX Switch
  • Cisco Nexus 93108TC-FX Switch
  • Cisco Nexus 9396TX Switch
  • Cisco Nexus 93120TX Switch
  • Cisco Nexus 93240YC-FX2 Switch
  • Cisco Nexus 9332C Switch
  • Cisco Nexus 9372TX-E Switch
  • Cisco Nexus 93108TC-EX Switch
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Known Affected Releases


Description (partial)

An ARP request from the endpoint behind the remote leaf switch is received on the leaf switch and is flooded to the spine switch as expected (ARP flooding enabled on bridge domain). This can be an issue in cases where the endpoint is behind something such as a Fabric Interconnects, in which it may be expected behavior to delete the MAC address if the endpoint receives the same MAC address back from the upstream leaf switches.

The issue seems specific to remote leaf switch deployments that have ARP flooding enabled and remote leaf direct disabled (RLD). To check if RLD enabled or not:

remote leaf# moquery -d sys | egrep "rlRoutableMode|rldirectMode"
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