Second existing routing protocols or algorithms are outlined and compared as the classification of plane, hierarchical as well as the position aided ones.

接着概述现有的平面、层次以及位置辅助路由协议或算法并做了必要的分析和比较；

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The application of SDN to deployed routing and signaling protocols and as a viable technology to automate and operate long deployed control plane software is now really gaining traction.

部署路由和信令协议、作为一种可行的技术来实现自动化，以及运行长期部署的控制平面软件等SDN应用已经有了很大的需求。

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