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2 多协议标签交换--MPLStMPLS是Internet中多层交换的最新成果。它是基于IETF标准的方案，建立在多种特有的多层交换解决方案之上。 MPLS使用控制驱动模式来初始化标签绑定的分配和分发（标签绑定用于建立LSP）。LSP本质是单向的（从头到尾在一个方向上的业务流），双向业务需
2 multi-protocol label switching - MPLS tMPLS is the latest multi-layer exchange in the Internet. It is based on the IETF standard solution, built on a variety of unique multi-layer switching solutions. MPLS uses a control-driven mode to initialize the allocation and distribution of label bindings (label bindings used to establish LSPs). The nature of LSPs is unidirectional (traffic flows in one direction from the beginning to the end) and bidirectional services are required