Network traffic explosive growth of new businesses are emerging, there is an urgent demand for a flexible, reliable and scalable the emergence of intelligent optical network. As intelligent optical control plane network of key technologies,"signaling technology"is very important to the study. GMPLS is the use of ASON agreement, that is the more universal sign exchange agreement and an agreement GMPLS Optical Networks MPLS technology to the development of a product. Common signs multi-protocol exchange agreement through the various layers of the network connection control and data plane full division of the way to strengthen the structure of MPLS. This article discusses Generalized Multi-Protocol Label Switching Protocol(GMPLS) working principle, as well as the similarities and differences between MPLS and GMPLS. GMPLS key technologies, and the GMPLS links protect/resume.%网络业务量的爆炸性增长，各种新业务的不断涌现，迫切需求一个灵活、可靠、可扩展的智能光网络的出现。作为智能光网络控制平面关键技术“信令技术”的研究显得非常重要。GMPLS是目前ASON采用的协议，即通用多协议标志交换协议GMPLS是MPLS技术向光网络发展的产物。通用多协议标志交换协议通过对各种网络连接层的控制和数据平面进行完全划分的方式强化了MPLS的架构。本文主要讲解了通用多协议标志交换协议(GMPLS)的工作原理，以及GMPLS和MPLS异同。GMPLS的关键技术，以及GMPLS链路保护/恢复。
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