近年来，SDN以燎原之势迅猛发展，重新定义了网络架构及业务模型，提出了运营集约、资源统一、网络开放的发展思路。分析了目前城域网在网络建设、业务承载和维护管理上存在的问题和不足，从保护投资、业务保障、建设和维护成本等方面考虑，提出分3个阶段引入SDN的具体方案。鉴于SDN目前标准和产业链尚未成熟，而且将涉及组织、运营、流程乃至产业链的重构，建议在引入时要以具体需求为导向，不宜盲目开展网络部署。%In recent years,SDN is developed in an unstoppable way,the network architecture and service model are redefined,and the idea of developing intensive operation,uniform resource and network opening is put forward. Firstly,it analyzes the problems and deficiencies on the network construction,service carrying and maintenance management,and puts forward the concrete scheme of introducing SDN in three stages from the aspects of protecting investment,business security,construction and maintenance costs. At the same time,the current standard and the industry chain is not yet mature,and wil involve the orga-nization,operation,process and even the industrial chain of reconstruction,and final y proposes that the introduction of SDN takes the specific needs as the guide,network deployment should not be blindly carried out.
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