Campaign: English for the military. Student's book, Book 1 by Simon Mellor-Clark, Yvonne Baker de Altamirano

By Simon Mellor-Clark, Yvonne Baker de Altamirano

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Multicast groups can also be classified according to the relative number of users, as described by Deering and Cheriton [50]. In sparse groups, the number of participants is small compared to the number of nodes in the network. On the other hand, when most of the nodes in the network are engaged in multicast communication, the groups involved are called pervasive groups [186]. A multicast tree is a set of arcs without loops that connects the nodes in a multicast group. Generally, multicast trees are the preferred way of generating routes in multicast networks, since their use avoids redundancy in data transmission.

Considering the simplicity of the algorithm, there are not many avenues for improvement of its running time, making this a tight analysis. 4 Distributed Implementation The main advantage of the distance-vector routing method is the relative simplicity of the underlying Bellman–Ford algorithm. Since there is no required order in which the edges must be tested by the main procedure, it becomes possible to perform the computation in a distributed fashion. A distributed version of the Bellman–Ford algorithm is possible if each node maintains a shortest path vector – or at least the part of the vector that is required to compute the path in the local network.

Let x be a vector in Rm , where m D jEj, and xe is 1 if and only if the link e is selected as part of the shortest path. j;i /2E x 0; where bi D 1 if node i is either a source or a destination, and bi D 0 otherwise. In this formulation, the objective function represents the total cost of the path. i; j / is selected for the shortest path. The set of constraints require that the amount of flow leaving a node be equal to the amount of flow entering the node, plus or more the value of bi . The value of bi indicates if a particular node is a source or destination.

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