Abstract: Name Data Networking（NDN） is a data-centric network architecture. The existing three forwarding strategies have the problems like high-occupied bandwidth or high retransmission due to neglecting the status of node faces. This paper proposes a Detect First Forward Later（DFFL） strategy to efficiently use the status of node faces. The simulation results show that DFFL can lower the network delay, data hop count and data retransmission. The high efficiency when the DFFL is applied into NDN has been proved.

Key words: Named Data Networking（NDN）, Content-Centric Networking（CCN）, forwarding strategy, flooding

摘要： 命名数据网络（Named Data Networking，NDN）是一种全新的以内容为中心的网络体系架构。转发机制是NDN的核心问题，现有的三种转发策略被动响应节点接口的工作状态，存在占用带宽资源高或重传次数多等问题。为有效利用节点接口状态以提高转发效率，提出一种先探测后转发的策略DFFL（Detect First Forward Later），将节点接口的即时状态作为选择转发接口的重要因素。仿真实验结果表明，DFFL有效降低了网络时延、报文跳数及请求报文重传次数，验证了该转发策略在NDN环境下的适用性。

关键词: 命名数据网络, 内容中心网络, 转发策略, 洪泛