OpenShift Container Platform 4.13 to 4.14 upgrade breaks networking when OVNKubernetes is used because 100.88.0.0/16 is already in use

Solution Verified - Updated -

Issue

  • Upgrading from 4.13.41 to 4.14.24 on clusters using OVN we are seeing issues and pods are loosing connectivity beyond the node they're running in.
  • Upgrade to OpenShift 4.14 is causing networking problems when Network Operator is updated. Beside connectivity on the node, no further communication is possible/working.

Environment

  • Red Hat OpenShift Container Platform (RHOCP) 4.14

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