Davide Cherubini - PhD Thesis - UniCA Eprints

7.3 The IBCN European networkmaximum link utilization to 40.43% of the links capacity. This result correspondsto a “gain” of capacity equal to 42.77% with respect to the “default” configurationand a reduction of occupation of 24.73% with respect to the IS-IS optimization.The only “price to pay” is that 822 LSPs have to be set. Note that such operationcan be done in a supervised automatic way.Graphically, results can be summarized using histograms where in the x-axisthe arc is indicated and the y-axis shows the correspondent link utilization.Figure 7.3: Default metrics under normal conditionObserving the histograms it is possible to note that with respect to the initialsituation (figure 7.3), the IS-IS optimization process only reduces the peaks oftraffic (figure 7.4).In the other hand, the MPLS optmization technique (figure 7.5) “equalizes” theoccupation of the links, by distributing the flows over the whole network, reducingthe waste of network resources.70