We take the virtual circuit scheme because thenetwork architecture based packet switching can not overcome the quality of service .
之所以采用基于虚电路的方案,是因为当今的各种研究表明在采用数据报传递的网络架构中要从根本上解决网络服务质量的问题是不可能的。
Virtual Circuit Connectivity Verification (VCCV) is an OAM(Operation and Maintenance)mechanism of layer 2 Virtual Private Network,which belongs to a scope of Pseudowire Edge to Edge Emulation(PWE3)technology.
虚电路连通性验证(VCCV)是一种L2VPN的OAM机制,属于PWE3技术的范畴。