def source_interface=(name)
      fail TypeError unless name.is_a? String
      if name.empty?
        config_set('tacacs_server', 'source_interface', 'no', '')
      else
        config_set('tacacs_server', 'source_interface', '', name)
      end
    end
def source_interface=(name)
      fail TypeError unless name.is_a? String
      if name.empty?
        config_set('tacacs_server', 'source_interface', 'no', '')
      else
        config_set('tacacs_server', 'source_interface', '', name)
      end
    end
Set source interface