Kubernetes 网络实现

官方这篇文章提到：

Other networking implementation examples

With the primary aim of providing IP-per-pod-model, other implementations exist to serve the purpose outside of GCE.

OpenVSwitch with GRE/VxLAN
Flannel

有没有什么好的方案不用Google自己的GCE而能够实现IP-per-pod-model呢?
上述两个方案有什么best practice吗?