Automatic protective switching method, equipment and system

The embodiment of the invention provides an automatic protective switching method, equipment and a system. One method comprises the following steps: when the bandwidth change of a first transfer path is monitored, determining partial services as to-be-switched services according to bandwidth change condition; switching the to-be-switched services between links of a second transfer path and the first transfer path. The other method comprises the following steps: receiving partial switching messages from network edge nodes of an opposite terminal through the first transfer path and the second transfer path; determining the to-be-switched services according to indication information or the bandwidth change condition of the to-be-switched services in partial switching messages, and switching the to-be-switched services between the links of the first transfer path and the second transfer path. The embodiment of the invention adopts a technological measure for carrying out protective switching on partial services, and therefore, bandwidth resources of each transfer path can be reasonably utilized to reduce the service switching amount. Load is reasonably shared in each transfer path so as to improve the service transfer efficiency and quality.