OVN

Initial release| September 27, 2016; 9 years ago (2016-09-27)
Stable release|

2.12.0 [1] / September 10, 2019; 6 years ago (2019-09-10)

Written in| C
Operating system| Linux, Hyper-V, FreeBSD and NetBSD
Type| Network virtualization
License| Apache License 2.0
Website| www.ovn.org

OVN (Open Virtual Network) is a system to support virtual network abstraction. OVN complements the existing capabilities of Open vSwitch to add native support for virtual network abstractions, such as virtual L2 and L3 overlays and security groups.

## Contents

* 1 Overview
* 2 Features
* 3 See also
* 4 References

## Overview

OVN is a network virtualization platform that separates the physical network topology from the logical one.[2] Users are able to connect virtual and physical interfaces with logical switches and routers, regardless of the underlying physical topology. Users are also able to define security policies and load-balancing to these logical instances. OVN uses Open vSwitch for its switching fabric and uses tunnels to provide the logical/physical separation.

Open source bindings for OVN are available for a number of platforms, such as OpenStack[3] and Kubernetes.[4] OVN is the software-defined networking platform used in a number of Red Hat products, including Red Hat Virtualization,[5] OpenStack,[6] and OpenShift.[7]

OVN is written in platform-independent C language, which provides easy portability to various environments. The source code is licensed under the Apache License 2.0.

## Features

As of May 2018, features provided by OVN include the following:

* Logical switches
* Flexible L2/L3/L4 security policies
* Distributed logical IPv4 and IPv6 routers
* Native support for NAT, load-balancing, and DHCP
* L2 and L3 gateways

## See also

* Network virtualization
* Open vSwitch
* Software-defined networking (SDN)

## References

1. ↑ Justin Pettit (September 10, 2019). "[ovs-announce Open vSwitch 2.12.0 Available"]. https://mail.openvswitch.org/pipermail/ovs-announce/2019-September/000255.html.
2. ↑ "What Is Open Virtual Network (OVN)? How It Works" (in en-US). SDxCentral. https://www.sdxcentral.com/networking/virtualization/definitions/what-is-open-virtual-network-ovn-how-it-works/.
3. ↑ "OpenStack Docs: networking-ovn - OpenStack Neutron integration with OVN" (in en). https://docs.openstack.org/networking-ovn/latest/.
4. ↑ "openvswitch/ovn-kubernetes" (in en). https://github.com/openvswitch/ovn-kubernetes.
5. ↑ "Red Hat Virtualization - Red Hat Customer Portal" (in en). https://access.redhat.com/products/red-hat-virtualization.
6. ↑ "Networking with Open Virtual Network - Red Hat Customer Portal" (in en). https://access.redhat.com/documentation/en-us/red_hat_openstack_platform/15/html/networking_with_open_virtual_network/index.
7. ↑ "OpenShift Roadmap: What's Next for Red Hat's Kubernetes Container Platform?". https://www.serverwatch.com/server-news/openshift-roadmap-whats-next-for-red-hats-kubernetes-container-platform.html.

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