Traffic Engineering in DiffServ-Based MPLS Networks

The combined use of the differentiated services (DiffServ) and multiprotocol label switching (MPLS) technologies is envisioned to provide guaranteed quality of service (QoS) for multimedia traffic in IP networks. One of the most attractive applications of MPLS is traffic engineering (TE), However, MPLS by itself cannot provide service differentiation, which brings up the need to complement it with another technology capable of providing such a feature: DiffServ. By mapping the traffic from different DiffServ classes of service on separate LSPs(light switched paths) networks can meet engineering constraints specific to the given class on both shortest and non-shortest path. This TE strategy is called DiffServ-aware TE (DS-TE). The experimental results caculated in this paper plot the efficiency of GMPLS/Lightwave Agile Switching Simulator (GLASS) as a network manager in different and unpredictable traffic conditions at the expense of a limited increase in the computational complexity and cost.