VM in OpenShift Virtualization is ignoring MTU configuration

Solution Verified - Updated -

Issue

  • In OpenShift Virtualization, we have configured a Linux bridge with jumbo frames (MTU 9000).
  • We have configured the NetworkAttachmentDefinition with MTU 9000.
  • The VM is ignoring the MTU settings and uses a MTU of 1500.

Environment

  • OpenShift Container Platform (OCP) 4.14
  • OpenShift Virtualization 4.14
  • Kubernetes NMstate operator
  • Multus secondary network using a Linux bridge

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