Network connectivity when using VXLAN with Cisco enic NIC is intermittent; packets are seen to be lost. Affects OpenStack environments.

Solution Unverified - Updated -


  • A container in an OpenStack container fails to connect to a remote instance right away. It may eventually connect but connectivity continues to be intermittent.
  • Pings between the same systems works without issue.
  • Packet capture analysis shows the issue is caused by some of the VXLAN encapsulated traffic disappearing.


  • Red Hat Enterprise Linux 7
  • Red Hat OpenStack Platform
  • enic driver
  • Cisco UCS hardware

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