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# fnss.traffic.trafficmatrices.static_traffic_matrix

`static_traffic_matrix`(topology, mean, stddev, max_u=0.9, origin_nodes=None, destination_nodes=None)

  Return a TrafficMatrix object, i.e. a single traffic matrix, representing the traffic volume exchanged over a network at a specific point in time

  This matrix is generated by assigning traffic volumes drawn from a lognormal distribution and assigned to specific origin-destination pairs using the Ranking Metrics Heuristic method proposed by Nucci et al. [R27]

  Parameters: | topology : topology The topology for which the traffic matrix is calculated. This topology can either be directed or undirected. If it is undirected, this function assumes that all links are full-duplex. mean : float The mean volume of traffic among all origin-destination pairs stddev : float The standard deviation of volumes among all origin-destination pairs. max_u : float, optional Represent the max link utilization. If specified, traffic volumes are scaled so that the most utilized link of the network has an utilization equal to max_u. If None, volumes are not scaled, but in this case links may end up with an utilization factor greater than 1.0 origin_nodes : list, optional A list of all nodes which can be traffic sources. If not specified, all nodes of the topology are traffic sources destination_nodes : list, optional A list of all nodes which can be traffic destinations. If not specified, all nodes of the topology are traffic destinations
  Returns: | tm : TrafficMatrix

  References

  [R27] | (1, 2) Nucci et al., The problem of synthetically generating IP traffic matrices: initial recommendations, ACM SIGCOMM Computer Communication Review, 35(3), 2005

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