Minimizing the Effect of Imprecise Network state Information through reduced Overhead in the WDM Networks

Abstract

The All-Optical Network promises what has long been sought by carriers, ISP's, and private network operators--increased bandwidth, faster service provisioning, easier management, reduced costs, and greater reliability. The need for these improvements is obvious - record numbers of new Internet users and new Internet devices, the explosion in data traffic, the increasing demand for media-rich content - all demonstrate the phenomenal growth of the Internet and the need for increased bandwidth. And the adoption of high-speed, last-mile technologies will certainly fuel greater demand. The increasing bandwidth demand has felt the need of a QoS routing, which is possible, only if the nodes have the prior knowledge of the current network state. Many routing and wavelength assignment algorithms, which perform the best, have indicated their propensity for the existing global network state. And in the presence of such imprecise network state, the performance of the existing routing and wavelength assignment algorithms degrades. So it is one of the root causes which is observed in a practical networking scenarios that has effected the performance of network. So to avoid the imprecise network state the nodes exchange the information with each other following some exchange policy. The quality of the exchange information is determined by the granularity of the exchange policy. The quicker the exchange of information the more precise network state and vice versa. But the vii quicker exchange of information simply overwhelm the network control plane, which itself is a problem that is largely left unsolved. The strategy applied to solve the problem is the introduction of the concept of advertising statuses of wavelength over the links in the form of contiguous wavelength bundles. This has contributed to a tremendous reduction in the control plan overhead both in terms of communicational and storage.