摘要
目前多协议标签交换(MPLS)的传输层网络设计中主要有两种可选方案。该文将分析和比较在两种方案下离线型流量工程算法的性能。采用网络仿真工具ns2.1b7进行了算法实现和仿真。仿真结果表明,在带宽受限的网络环境下(如无线网络或特种网络),在数据分组有效负载利用率允许的范围内,选择较小的数据分组长度能将离线型流量工程算法的性能与理论最优性能之间的相对误差减少80%以上。因此从流量工程的角度来讲,在MPLS传输层网络设计时采用ATM短信元格式将更有利于在各链路上均衡网络负载,从而获得更好的网络服务质量。
There are now primarily two schemes for MPLS transport network design. This paper evaluates the performance of off-line traffic engineering under two schemes. Simulations have been done in ns2 environment. Results show that when network capacity is limited (such as in wireless network or ad- hoc network), the relative error between the performance of off-line traffic engineering and the theoretical optimal performance can be decreased by more than 80% if, we choose smaller packet length under acceptable packet utilization rate. Therefore, from the perspective of traffic engineering, when designing MPLS transport network, the scheme of short ATM cells will have more advantage to balance load of network across all links, and hence provides better perceived QoS of network.
出处
《计算机工程》
CAS
CSCD
北大核心
2004年第12期13-15,113,共4页
Computer Engineering
