How to verify GENEVE port (UDP 6081) traffic between OpenShift nodes when using OVN-Kubernetes as the CNI

Solution Verified - Updated -

Issue

  • In OpenShift clusters using the OVN-Kubernetes CNI, UDP port 6081 is used for GENEVE tunnel communication between nodes.

  • Even if all nodes appear Ready and OVN pods are running, the required traffic on UDP port 6081 may still be blocked. This can result in inter-node pod communication issues, especially after migrating from SDN to OVN-Kubernetes.

Environment

  • Red Hat OpenShift Container Platform
    • 4
  • OVN-Kubernetes CNI plugin

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