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In the management of large enterprise communication networks, it becomes difficult to detect and identify causes of abnormal change in traffic distributions when the underlying logical topology is dynamic. This paper describes a novel approach to abnormal network change detection by representing periodic observations of logical communications within a network as a time series of graphs. A number of graph distance measures are proposed to assess the difference between successive graphs and identify abnormal behaviour. Localisation techniques have also been described to show where in the network most change occurred.

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Abstrsct: This paper describes an experimental ATM network for B-ISDN research. A novel archilecture is employed in which the control processor for the switch is interfaxed via an ATM link. It is suggested that this architecture offers a number of unique advantages over conventional switch designs for both nawork operators and manufacturers. These include flexibility in locating and dimensioning control processors and the apening of P new market in exchange controllers. The switch alsa features multiple discard and delay priority levels on a per VC/W basis.