Abstract
The paper deals with constraint-based routing (CBR) in MPLS-TE networks and proposes a new CBR algorithm based on fuzzy logic called Fuzzy Class-Based Algorithm (FCBA). Multiprotocol label switching with traffic engineering (MPLS-TE) networks represent a popular mechanism to effectively use resources of service providers’ core networks. The paths can be either built by administrators (explicit routing) or built by using existing routing algorithms which mostly decide based on the shortest paths towards the destination which might not be sufficient in nowadays’ multimedia networks. To address this problem various CBR algorithms have emerged which take into consideration various aspects important to existing traffic like QoS parameters or administrative policies. FCBA makes routing decisions based on traffic classes and by using fuzzy logic we can assign normalized values to various constraints based on the traffic class’ preferences (e.g., low delay paths for voice traffic) and network administrator’s preferences (e.g., avoiding congested links). The paper provides comparison of FCBA with existing CBR approaches based on their ability to provide QoS parameters loss. The simulations show that FCBA provides the best results for the highest priority traffic where it uses lower priority traffic to efficiently utilize the network.
Highlights
Nowadays the modern telecommunication networks should be able to transfer very varied multimedia traffic resulting in a fully converged network
The aim of our proposed Constraint-based routing (CBR) algorithm called Fuzzy ClassBased Algorithm (FCBA) algorithm is to bring flexibility to the chosen routing constraints and to make the routing decisions based on various needs of the traffic classes and/or the network itself
We proposed a new CBR algorithm called Fuzzy Class-Based Algorithm (FCBA) based on fuzzy logic which does not discard a path based on one metric it can be optimal based on another metric as it is done with Shortest Widest Path (SWP) and Widest Shortest Path (WSP) algorithms
Summary
Nowadays the modern telecommunication networks should be able to transfer very varied multimedia traffic resulting in a fully converged network. Transferring data, voice, and video traffic in one network requires effective mechanisms which take the various traffics’ requirements in consideration [1]. Such requirements are in a form of quality of service (QoS) parameters. MPLS-TE provides connection-oriented approach in IP networks It creates end-to-end paths (LSPs) where it can guarantee bandwidth and with traffic engineering it can truly optimize the network’s resources. The decision is based on fuzzy logic which allows the algorithm to take all the constraints into consideration.
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