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Cisco Bug: CSCuj70037 - N3K loops packet across vPC on reload

Last Modified

Feb 15, 2018

Products (5)

  • Cisco Nexus 3000 Series Switches
  • Cisco Nexus 3064 Switch
  • Cisco Nexus 3016 Switch
  • Cisco Nexus 3064-T Switch
  • Cisco Nexus 3048 Switch

Known Affected Releases

6.0(2)U1(2)

Description (partial) 

Symptom:
A loop is created when one of the Nexus 3000 switch in a vPC pair is reloaded.
You would see MAC flaps on upstream switch.

*Oct  8 23:54:21.640: %MAC_MOVE-4-NOTIF: Host 0000.0c07.ac03 in vlan 202 is flapping between port Po1 and port Gi5/1
*Oct  8 23:54:21.640: %MAC_MOVE-4-NOTIF: Host 0000.0c07.ac02 in vlan 202 is flapping between port Po1 and port Gi5/1

Conditions:
Only takes place when switch reloads and is stable once switch comes up and vPCs are up
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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
  • Severity
  • Known Fixed Releases
  • Related Community Discussions
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