MPLS 是 IP 网络的适应性与虚电路的稳定性的完美结合,但这个结合是如何工作的呢?IP 技术和 Internet 的产生绝对是网络发展史上最令人兴奋的事情,因此很容易对 IP 在更新和更广应用上的成功作出预测,包括语音和虚拟专网(VPN)。但是,IP 网络的收入比公共电信承载商收入的百分之一还少,假如 IP 想获得实际利润的话,它至少必须承担传统网络技术所支持的通信量和应用。许多人认为,IP 发展的最大障碍就是它自身的特性——IP 协议的无连接性。在这样的协议下,每一个信元(例如一个数据包或一个语音压缩块)独自寻址,依据分布式路由表在网络中传输,每个节点定期修改路由表以反映当前网络的拓扑结构。没有节点或链路 MPLS is the perfect combination of the adaptability of IP network and the stability of virtual circuit. But how does this combination work? The emergence of IP technology and Internet is definitely the most exciting thing in the history of network development, so IP Forecasts of success, update and broader adoption, including voice and virtual private networks (VPNs). However, IP networks earn less than one percent of public carrier revenue. If IP wants to make real profits, it must at least assume the traffic and applications that traditional network technologies support. Many people think that the biggest obstacle to the development of IP is its own characteristics - the non-connectivity of the IP protocol. Under such protocols, each cell (eg, a data packet or a voice compression block) is addressed individually and in the network according to a distributed routing table. Each node regularly updates the routing table to reflect the current network topology. No nodes or links