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# fnss.netconfig.buffers.set_buffer_sizes_link_bandwidth

`set_buffer_sizes_link_bandwidth`(topology, k=1.0, default_size=None, buffer_unit='bytes', packet_size=1500)

  Assign a buffer sizes proportionally to the bandwidth of the interface on which the flush. In particularly, the buffer size will be equal to , where is the capacity of the link in bps.

  This assignment is equal to the bandwidth-delay product if is the average RTT in seconds.

  To use this function, all links of the topology must have a capacity 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 or DirectedTopology The topology on which delays are applied. k : float, optional The multiplicative constant applied to capacity to derive buffer size default_size : float, optional The buffer size to be applied to interfaces whose speed is unknown. If it is None and at least one link does not have a capacity attribute, return an error buffer_unit : string, unit The unit of buffer sizes. Supported units are: bytes and packets packet_size : int, optional The average packet size (in bytes). It used only if packets is selected as buffer size to properly calculate buffer sizes given bandwidth and delay values.

  Examples

      >>> import fnss
      >>> topology = fnss.erdos_renyi_topology(50, 0.1)
      >>> fnss.set_capacities_constant(topology, 10, 'Mbps')
      >>> fnss.set_delays_constant(topology, 2, 'ms')
      >>> fnss.set_buffer_sizes_link_bandwidth(topology, k=1.0)

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