code: def request(self, rpc_command, source=None, filter=None):
          
  
  
          if etree.iselement(rpc_command):
              node = rpc_command
          else:
              node = new_ele(rpc_command)
          if source is not None:
              node.append(util.datastore_or_url("source", source, self._assert))
          if filter is not None:
              node.append(util.build_filter(filter))
  
          return self._request(node)
docs: *rpc_command* specifies rpc command to be dispatched either in plain text or in xml element format (depending on command)
  
          *source* name of the configuration datastore being queried
  
          *filter* specifies the portion of the configuration to retrieve (by default entire configuration is retrieved)
  
          :seealso: :ref:`filter_params`
  
          Examples of usage::
  
              dispatch('clear-arp-table')
  
          or dispatch element like ::
  
              xsd_fetch = new_ele('get-xnm-information')
              sub_ele(xsd_fetch, 'type').text="xml-schema"
              sub_ele(xsd_fetch, 'namespace').text="junos-configuration"
              dispatch(xsd_fetch)