In end-to-end QoS provisioning some bandwidth portions on the link may be reserved for certain traffic classes (and for particular set of users) so the congestion problem of concurrent flows (traversing the network si...In end-to-end QoS provisioning some bandwidth portions on the link may be reserved for certain traffic classes (and for particular set of users) so the congestion problem of concurrent flows (traversing the network simultaneously) can appear. It means that in overloaded and poorly connected MPLS/DS networks the CR (Constraint-based Routing) becomes insufficient technique. If traffic engineering is supported with ap-propriate traffic load control the congestion possibility can be predicted before the utilization of guaranteed service. In that sense the initial (proactive) routing can be pre-computed much earlier, possible during SLA (Service Level Agreement) negotiation. In the paper a load simulation technique for load balancing control purpose is proposed. It could be a very good solution for congestion avoidance and for better load-balancing purpose where links are running close to capacity. To be acceptable for real application such complicated load control technique needs very effective algorithm. Proposed algorithm was tested on the network with maximum M core routers on the path and detail results are given for N=3 service classes. Further improve-ment through heuristic approach is made and results are discussed. Some heuristic options show significant complexity savings that is appropriate for load control in huge networks.展开更多
融合了多协议标记交换 (Multiprotocol L abel Switching,MPL S)和区分服务 (Differentiated Services,Diff Serv)技术 ,建立了 Diff Serv over MPL S模型 ,研究了在模型上承载区分服务 ,以实现端到端的服务质量(Quality of Service,Qo...融合了多协议标记交换 (Multiprotocol L abel Switching,MPL S)和区分服务 (Differentiated Services,Diff Serv)技术 ,建立了 Diff Serv over MPL S模型 ,研究了在模型上承载区分服务 ,以实现端到端的服务质量(Quality of Service,Qo S)的技术 .详细描述了其中的重要概念、分组的转发处理过程及基于约束路由的标记分发协议 (Constraint- based Routing L abel Distribution Protocol,CR- L DP)的扩展细节 .展开更多
文摘In end-to-end QoS provisioning some bandwidth portions on the link may be reserved for certain traffic classes (and for particular set of users) so the congestion problem of concurrent flows (traversing the network simultaneously) can appear. It means that in overloaded and poorly connected MPLS/DS networks the CR (Constraint-based Routing) becomes insufficient technique. If traffic engineering is supported with ap-propriate traffic load control the congestion possibility can be predicted before the utilization of guaranteed service. In that sense the initial (proactive) routing can be pre-computed much earlier, possible during SLA (Service Level Agreement) negotiation. In the paper a load simulation technique for load balancing control purpose is proposed. It could be a very good solution for congestion avoidance and for better load-balancing purpose where links are running close to capacity. To be acceptable for real application such complicated load control technique needs very effective algorithm. Proposed algorithm was tested on the network with maximum M core routers on the path and detail results are given for N=3 service classes. Further improve-ment through heuristic approach is made and results are discussed. Some heuristic options show significant complexity savings that is appropriate for load control in huge networks.
文摘融合了多协议标记交换 (Multiprotocol L abel Switching,MPL S)和区分服务 (Differentiated Services,Diff Serv)技术 ,建立了 Diff Serv over MPL S模型 ,研究了在模型上承载区分服务 ,以实现端到端的服务质量(Quality of Service,Qo S)的技术 .详细描述了其中的重要概念、分组的转发处理过程及基于约束路由的标记分发协议 (Constraint- based Routing L abel Distribution Protocol,CR- L DP)的扩展细节 .
