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By A. Engler und K. Prantl

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L36 Main modeling dimensions. L=layer dimension; M=management dimension; N=node dimension When we work on an AMLn model we normally work only in one or sometimes in two dimensions. For example, taking the OSI RM model as a reference, we can either model it separately in the L and N dimensions, or apply a node structure on the L dimension and create a model in the L-N plane, as shown in Fig. 37. 42 1 Introduction to Network System Modeling LA s Application Session & presentation Transport Network Link Physical myWv^ ( Physical mediaN stratum / N Li Application Session & presentation_ Transport Network Link Physical Fig.

Since the contents of hosted nodes is changeable, it must be defined by data in configuration tables that are maintained from a management system. This configuration function relies on the hosts relations, defined in the logical-network structure model. A logical node communicates with peer nodes over routes. The node knows the route endpoint to each peer. A route endpoint can be the name of a remote node 34 1 Introduction to Network System Modeling and such names are only locally known within the very logical network (sometimes called "global titles").

4. The LSM-LPM separation separates the stable states of a layer from the volatile states that are associated to message handling. Three additional principles are derived from the above: 1. Substituting an OSI RM layer with an agent layer and supported actors allows a layer structure to be divided into a control structure and one or several structures of agent layers and connectivity layers. We call the latter connectivity structures. 2. Defining the common-agent layer. 3. Defining common actors.

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