Category: Networking Problems

OVN daemons (e.g., ovn-controller) are stuck in a tight poll loop, driving CPU to 100 %. Logs show “Dropped … due to excessive rate” or“Unreasonably long … poll interval,” slowing port-binding and network traffic.

In OpenStack deployments using Neutron with the OVN ML2 driver, ports could be bound to agents that were not alive. This behavior led to virtual machines experiencing network interface plug timeouts during provisioning, as the port binding would not complete successfully.

During load balancer creation or other operations involving logical router and logical switch associations, Neutron OVN may raise a `RowNotFound` exception when attempting to reference a logical switch that has just been deleted. This leads to a port binding failure and a rollback of the affected operation.

Critical AWS VPC CNI IP address exhaustion detected. This pattern indicates cascading failureswhere subnet IP exhaustion leads to ENI allocation failures, pod scheduling failures, andcomplete service unavailability. The failure sequence shows IP allocation errors, ENI attachmentfailures, and resulting pod startup failures that affect cluster scalability and workload deployment.