Merge pull request #27346 from luolanzone/antrea

add antrea in network addon list

Author: k8s-ci-robot

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

@@ -16,6 +16,7 @@ This page lists some of the available add-ons and links to their respective inst
 ## Networking and Network Policy
 
 * [ACI](https://www.github.com/noironetworks/aci-containers) provides integrated container networking and network security with Cisco ACI.
+* [Antrea](https://antrea.io/) operates at Layer 3/4 to provide networking and security services for Kubernetes, leveraging Open vSwitch as the networking data plane.
 * [Calico](https://docs.projectcalico.org/latest/introduction/) is a networking and network policy provider. Calico supports a flexible set of networking options so you can choose the most efficient option for your situation, including non-overlay and overlay networks, with or without BGP. Calico uses the same engine to enforce network policy for hosts, pods, and (if using Istio & Envoy) applications at the service mesh layer.
 * [Canal](https://github.com/tigera/canal/tree/master/k8s-install) unites Flannel and Calico, providing networking and network policy.
 * [Cilium](https://github.com/cilium/cilium) is a L3 network and network policy plugin that can enforce HTTP/API/L7 policies transparently. Both routing and overlay/encapsulation mode are supported, and it can work on top of other CNI plugins.