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阐述了虚拟环的概念及其利用双节点的SNCP(子网连接保护)环与虚拟的PP(通道保护)环相交组网的方法,并对其出现故障后业务如何得到保护进行了分析。
This paper describes the concept of virtual ring and the method of using the two-node SNCP (sub-network connection protection) ring to intersect with the virtual PP (channel protection) ring, and analyzes how the service is protected after the failure.