MPLS网络中识别区分服务约束路由方案QoS评价

QoS evaluation of diffserv-aware constraint-based routing schemes for multi-protocol label switching networks

区分服务不能提供端到端的 QoS,完成端到端的 QoS 需要流量工程通过 MPLS 和基于约束的路由算法方案实现。基于路径计算算法和 LSP 类型构建了四种识别区分服务的 CBR 方案。并提出一个建议方案,为每一种区分服务等级使用不同的路由计算算法。通过模拟每对节点间的声音流量和数据流量的路径调节,评价了由以上五种识别区分服务的 CBR 方案所达到的 QoS,结果显示建议方案能够为每一类流量提供更好的 QoS。

DiffServ cannot offer end-to-end QoS by itself,Achieving end-to-end QoS requires traffic engineering support by using MPLS and Constraint-Based Routing (CBR) schemes.In this paper,Four DiffServ-aware CBR schemes are constructed,based on a combination of route computation algorithms and LSP-types.Moreover,we propose a DiffServ-aware CBR scheme that uses a different route computation algorithm for each class.By simulating path accommodations for two-class traffic between every node pair,we evaluate QoS achieved by the five DiffServ-aware CBR schemes.The results show that the proposed scheme can offer better QoS for each class.