Path Switching in OBS Networks
نویسندگان
چکیده
We investigate the concept of path switching in optical burst switched (OBS) networks and its potential to reducing the overall burst drop probability. With path switching, each source maintains a list of alternate paths to each destination, and uses information regarding the recent congestion status of the network links to rank the paths; it then transmits bursts along the least congested path. We present a suite of path switching strategies, each utilizing a different type of information regarding the link congestion status, and evaluate them using simulation. Our results demonstrate that, in general, path switching outperforms shortest path routing, and, depending on the path strategy involved, the network topology, and the traffic pattern, this improvement can be significant. We also present a new framework for the development of hybrid path switching strategies, which make routing decisions based on a weighted combination of the decisions taken by several independent path switching strategies. We present two instances of such hybrid strategies, one that assigns static weights and one that dynamically adjusts the weights based on feedback from the network.
منابع مشابه
Traffic engineering approach to path selection in optical burst switching networks
It is usually assumed that optical burst switching (OBS) networks use the shortest path routing along with next-hop burst forwarding. The shortest path routing minimizes delay and optimizes utilization of resources, however, it often causes certain links to become congested while others remain underutilized. In a bufferless OBS network in which burst drop probability is the primary metric of in...
متن کاملPrioritized Deflection Routing in Optical Burst Switching Networks
Optical Burst Switching (OBS) aims to provide higher utilization and greater flexibility at a lower cost and reduced complexity than current optical circuit switched networks. We introduce a new routing protocol for Optical Burst Switching, Shortest Path Prioritized Random Deflection Routing (SP-PRDR), that aims to lower burst loss probabilities while only using limited state information from t...
متن کاملNovel reinforcement learning-based approaches to reduce loss probability in buffer-less OBS networks
Optical Burst Switching (OBS) is a promising switching paradigm for the next generation Internet. A buffer-less OBS network can be implemented simply and cost-effectively without the need for either wavelength converters or optical buffers which are, currently, neither cost-effective nor technologically mature. However, this type of OBS networks suffers from relatively high loss probability cau...
متن کاملBurst Routing Planning for Optical Networks using the Association Rule Approach
The Optical Burst Switching (OBS) is a technology positioned between optical circuit switching (OCS) and optical packet switching (OPS). It is a promising buffer-less DWDM switching technology that provides high wavelength utilization. One of the critical design issues in OBS network is effective planning in minimizing burst dropping resulted from resource contention. In this paper, we attempt ...
متن کاملAnt Colony Optimization for Distributed Routing Path Optimization in Optical Burst-Switched Networks
This work describes a distributed framework for routing path optimization in Optical Burst-Switched (OBS) networks that loosely mimics the foraging behaviour of ants observed in nature, which in the past has originated the Ant Colony Optimization (ACO) metaheuristic. The framework consists of additional data structures stored at the nodes and of special control packets that traverse the network...
متن کامل