摘要
传统的Internet只能提供尽力传送服务,但这种没有任何保证、不可预测的服务已不能满足许多应用的需要。IETF提出的Intserv/RSVP方案从技术角度可以提供灵活的服务质量,满足各种应用的需要,但该方案要求每个路由器保存每个连接的状态,复杂化了核心路由器的处理,因此实现和配置是非常困难的。IETF提出的Diffserv将各种复杂的接入控制、每个连接的管理交给边界路由器处理,核心路由器只处理流量聚合,因而具有更好的伸缩性和鲁棒性。MPLS是一种可以在多种第二层媒质上进行标签交换的网络技术,将探讨如何结合Diffserv和MPLS两种技术,提供各种服务质量,特别是VPN。
Traditional Internet only provides best-effort services, which cannot make any guarrantees and be predicted. The approach of Interserv/RSVP can offer flexible QoS and satisfy many application demands, but it complicates the backbone router and is difficult to deploy . Diffserv pushs admission control and management of per-flow state to boundary router, and the backbone routers only process traffic aggregate, so Diffserv is more scalable and robust. MPLS is commonly considered to operate between the link layer and the network layer in the protocol stack.The paper will discuss how to implement Diffserv over MPLS network to support different QoS, especially VPN
出处
《计算机工程》
CAS
CSCD
北大核心
2001年第4期14-16,共3页
Computer Engineering
基金
国家自然科学基金资助项目(69974031)