add Antrea description in dev-1.17 (#17919)

content/en/docs/concepts/cluster-administration/networking.md

@@ -86,6 +86,11 @@ imply any preferential status.
 
 [Cisco Application Centric Infrastructure](https://www.cisco.com/c/en/us/solutions/data-center-virtualization/application-centric-infrastructure/index.html) offers an integrated overlay and underlay SDN solution that supports containers, virtual machines, and bare metal servers. [ACI](https://www.github.com/noironetworks/aci-containers) provides container networking integration for ACI. An overview of the integration is provided [here](https://www.cisco.com/c/dam/en/us/solutions/collateral/data-center-virtualization/application-centric-infrastructure/solution-overview-c22-739493.pdf).
 
+### Antrea
+
+Project [Antrea](https://github.com/vmware-tanzu/antrea) is an opensource Kubernetes networking solution intended to be Kubernetes native. It leverages Open vSwitch as the networking data plane. Open vSwitch is a high-performance programmable virtual switch that supports both Linux and Windows. Open vSwitch enables Antrea to implement Kubernetes Network Policies in a high-performance and efficient manner.
+Thanks to the "programmable" characteristic of Open vSwitch, Antrea is able to implement an extensive set of networking and security features and services on top of Open vSwitch.
+
 ### AOS from Apstra
 
 [AOS](http://www.apstra.com/products/aos/) is an Intent-Based Networking system that creates and manages complex datacenter environments from a simple integrated platform.  AOS leverages a highly scalable distributed design to eliminate network outages while minimizing costs.