面向IP的分组传送网发展思路

业务IP化触发了新一代光传送网——分组传送网的兴起，业务IP化对光传送网提出了更大带宽传送、更加灵活组网等新挑战。实现IP与传送融合的分组传送网定位于满足IP业务的高效传送、灵活组网、高可扩展性和高可靠性等方面。分组传送概念在不同发展阶段和不同网络层次所表现的形式不尽相同，在骨干网主要表现为IP over波分复用（WDM）／光传送网（OTN）／可重构光分插复用（ROADM）的大带宽传送，而在城域网范围主要表现为以传送多协议标签交换（T—MPLS）和电信级以太网（CE）为代表的分组交换和传送技术。

The Evolution of IP-Oriented Packet Transport Network

The requirements of IP-based services bring a new generation technology of Optical Transport Network (OTN), which named packet transport networks. The IP-based services need the OTN to provide bigger bandwidth, more flexible networking, much higher scalability and resiliency. The packet transport has different concepts in different network developing periods and different network levels. In backbone networks, it is presented as big bandwidth transport in IP over Wavelength Division Multiplexing (WDM)/OTN/Reconfigurable Optical Add-Drop Multiplexer (ROADM), while in metro networks, it is presented as some major packet switch and transport technologies, such as Transport Multi-Protocol Label Switching (T-MPLS) and Carrier Ethernet (CE).