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Cisco Bug: CSCuo00667 - VXLAN duplicate traffic with VPC due to DMAC only programmed on one sw

Last Modified

Mar 16, 2016

Products (5)

  • Cisco Nexus 9000 Series Switches
  • Cisco Nexus 9396PX Switch
  • Cisco Nexus 9504 Switch
  • Cisco Nexus 9508 Switch
  • Cisco Nexus 93128TX Switch

Known Affected Releases


Description (partial)

Duplicate packets received over VXLAN overlay in VPC topology.

After boot up of a VPC switch duplicate packets may be received by devices on the far end VXLAN connection.  This may occur if a destination MAC address is not programmed on both VPC switches.  In this case the switch with the MAC address entry may forward the flow as a unicast VXLAN flow.  The switch without the MAC address entry may also forward the flow as unknown unicast
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