IP-Over-WDM网络中的分布式业务量自适应波长路由

B. Palanisamy, T. Prasad, N. Sreenath
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引用次数: 1

摘要

在波长路由波分复用(WR-WDM)网络中,一组光路(全光通信路径)定义了虚拟拓扑结构。互联网协议(IP)利用虚拟拓扑以光形式路由其流量。虚拟拓扑设计的目的是使某一目标函数值最小。当IP层的流量需求发生变化时,可能会影响网络(虚拟拓扑)的目标函数值,导致网络性能下降。因此,需要更改底层虚拟拓扑以响应IP层中不断变化的流量模式。这种改变虚拟拓扑以满足流量需求的过程称为重配置。由于像WDM网络上的IP这样的分布式网络需要一个完全分布式的重新配置过程,我们将重新配置视为一个在线分布式过程,它提供了目标函数值和提交给虚拟拓扑的更改数量之间的权衡。目标函数的值决定了拓扑如何最适合给定的流量需求。在向新的虚拟拓扑转换时,更改的数量决定了网络中流量中断的程度。通过大量的仿真实验,研究了该方法的性能,包括重构拓扑的目标函数值和为得到重构拓扑而进行的更改次数。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Distributed Traffic Adaptive Wavelength Routing in IP-Over-WDM networks
In wavelength routed wavelength division multiplexing (WR-WDM) networks, a set of lightpaths (all-optical communication paths) defines the virtual topology. Internet protocol (IP) makes use of virtual topology to route its traffic in the optical form. The virtual topology is designed with an aim of minimizing certain objective function value. In the event of changes in traffic demand at the IP layer, the objective function value of the network (virtual topology) may be affected leading to decreased network performance. Thus, the underlying virtual topology needs to be changed in response to the changing traffic patterns in the IP layer. This process of changing the virtual topology to meet the traffic requirement is called as reconfiguration. As distributed networks like IP over WDM networks demand a fully distributed process for reconfiguration, we view the reconfiguration as an on-line distributed process that provides a trade-off between the objective function value and the number of changes committed to the virtual topology. The objective function value decides how best the topology is suited for the given traffic demand. The number of changes decides the extent of traffic disruption in the network while making a transition to the new virtual topology. The performance of the proposed methodology is studied through extensive simulation experiments in terms of objective function value of reconfigured topology and the number of changes performed to get the reconfigured topology.
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