Thepaper deals with constraint-based routing (CBR) in MPLS-TE networks and proposes a newCBRalgorithmbased on fuzzy logic\ncalled Fuzzy Class-Based Algorithm (FCBA).Multiprotocol label switching with traffic engineering (MPLS-TE) networks represent\na popularmechanism to effectively use resources of service providers� core networks.Thepaths can be either built by administrators\n(explicit routing) or built by using existing routing algorithms which mostly decide based on the shortest paths towards the\ndestination which might not be sufficient in nowadays� multimedia networks. To address this problem various CBR algorithms\nhave emerged which take into consideration various aspects important to existing traffic like QoS parameters or administrative\npolicies. FCBAmakes routing decisions based on traffic classes and by using fuzzy logic we can assign normalized values to various\nconstraints based on the traffic class� preferences (e.g., low delay paths for voice traffic) and network administrator�s preferences\n(e.g., avoiding congested links). The paper provides comparison of FCBA with existing CBR approaches based on their ability to\nprovide QoS parameters loss.The simulations show that FCBA provides the best results for the highest priority traffic where it uses\nlower priority traffic to efficiently utilize the network.
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