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Cisco Bug: CSCvs66240 - vPC interfaces flaps during switch replacement

Last Modified

Oct 16, 2020

Products (25)

  • 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 93240YC-FX2 Switch
  • Cisco Nexus 9504 Switch
  • Cisco Nexus 9372TX-E Switch
  • Cisco Nexus 9332C Switch
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Known Affected Releases


Description (partial)

During leaf switch replacement, vPC ports (map-pinning mode) are flapped on existing switches in the vPC pair.

This issue occurs when a switch is being replaced as per the following procedure:

-          Before connecting the switch to the fabric, executed and then switch reloaded
-          Remove the old switch from the controller + waiting 15-20 minutes.
-          Connecting the new switch to the fabric (just the uplinks to both spine switches).
-          Start the registration process.
-          Just once the new node becomes active in the fabric, the vPC has flapped.
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