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About the OVN-Kubernetes default Container Network Interface (CNI) network provider

The OpenShift Container Platform cluster uses a virtualized network for pod and service networks. The OVN-Kubernetes Container Network Interface (CNI) plug-in is a network provider for the default cluster network. OVN-Kubernetes is based on Open Virtual Network (OVN) and provides an overlay-based networking implementation. A cluster that uses the OVN-Kubernetes network provider also runs Open vSwitch (OVS) on each node. OVN configures OVS on each node to implement the declared network configuration.

OVN-Kubernetes features

The OVN-Kubernetes Container Network Interface (CNI) cluster network provider implements the following features:

  • Uses OVN (Open Virtual Network) to manage network traffic flows. OVN is a community developed, vendor-agnostic network virtualization solution.

  • Implements Kubernetes network policy support, including ingress and egress rules.

  • Uses the Geneve (Generic Network Virtualization Encapsulation) protocol rather than VXLAN to create an overlay network between nodes.

Supported default CNI network provider feature matrix

OpenShift Container Platform offers two supported choices, OpenShift SDN and OVN-Kubernetes, for the default Container Network Interface (CNI) network provider. The following table summarizes the current feature support for both network providers:

Table 1. Default CNI network provider feature comparison
Feature OVN-Kubernetes OpenShift SDN

Egress IPs

Supported

Supported

Egress firewall [1]

Supported

Supported

Egress router

Partially supported [3]

Supported

IPsec encryption

Supported

Not supported

Kubernetes network policy

Supported

Partially supported [2]

Multicast

Supported

Supported

  1. Egress firewall is also known as egress network policy in OpenShift SDN. This is not the same as network policy egress.

  2. Network policy for OpenShift SDN does not support egress rules and some ipBlock rules.

  3. Egress router for OVN-Kubernetes supports only redirect mode.

OVN-Kubernetes limitations

The OVN-Kubernetes Container Network Interface (CNI) cluster network provider has a limitation that is related to traffic policies. The network provider does not support setting the external traffic policy or internal traffic policy for a Kubernetes service to local. The default value, cluster, is supported for both parameters. This limitation can affect you when you add a service of type LoadBalancer, NodePort, or add a service with an external IP.

Additional resources