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# fnss.netconfig.delays.set_delays_geo_distance

`set_delays_geo_distance`(topology, specific_delay, default_delay=None, delay_unit='ms', links=None)

  Assign a delay to all selected links equal to the product of link length and specific delay. To use this function, all nodes must have a ‘latitude’ and a ‘longitude’ attribute. Alternatively, all links of the topology must have a ‘length’ attribute. If the length of a link cannot be determined, it is applied the delay equal default_delay if specified, otherwise an error is returned.

  Parameters: | topology : Topology The topology on which delays are applied. specific_delay : float The specific delay (in ms/Km) to be applied to all links default_delay : float, optional The delay to be applied to links whose length is not known. If None, if the length of a link cannot be determined, an error is returned delay_unit : string, optional The unit of delays. Supported units are: “us” (microseconds), “ms” (milliseconds) and “s” (seconds) links : list, optional List of selected links on which weights are applied. If it is None, all links are selected

  Examples

      >>> import fnss
      >>> topology = fnss.parse_abilene('abilene_topo.txt')
      >>> fnss.set_delays_geo_distance(topology, specific_delay=fnss.PROPAGATION_DELAY_FIBER)

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