BGP MPLS VPN数据转发过程分析-《计算机技术与发展》

文章信息/Info

Author(s):: LI Hai-hua; National Digital Switching System Engineering ＆ Technological Center,PLA Information Engineering University

Keywords:: BGP MPLS VPN; label distribution protocol; BGP4; lable switching path; VPN label packet forwarding

摘要:: 对BGP MPLS VPN网络的体结构、网络层面中双层标签的功能及双层标签的分发过程进行认真分析。BGP MPLSVPN网络的体结构中的路由器有提供商路由器、提供商边缘路由器、用户边缘路由器三类。一个VPN标签分组内外双层标签分别由扩展BGP协议和标签分发协议提供,内标签标识数据分组发向哪一个服务商边缘路由器及属于哪一个VPN,外层标签建立MPLS骨干网中的标签交换通道。最后给出一个VPN标签分组的转发示例来说明数据分组转发的全过程

Abstract:: The BGP MPLS VPN network structure,functions in the double-label and the distribution process of double label is analysed carefully.BGP MPLS VPN network has three types of routers,they are the provider router,provider edge router and customer edge router,a VPN label packet includes the inside and outside double-label,they are provided by the extended BGP protocol and label distribution protocol,inside lable identifies the data packet sent to a service provider which is which edge routers and VPN,at the same time,outside label establishes the label switched path on MPLS backbone network.Finally,a VPN label group examples to illustrate the entire process of the forwarding of data packet