code: def dcnm_network_delete_event(self, network_info):
          
          seg_id = network_info.get('segmentation_id')
          if not seg_id:
              LOG.error('Failed to delete network. Invalid network '
                        'info %s.', network_info)
          query_net = self.get_network_by_segid(seg_id)
          if not query_net:
              LOG.info('dcnm_network_delete_event: network %(segid)s '
                       'does not exist.', {'segid': seg_id})
              return
          if self.fw_api.is_network_source_fw(query_net, query_net.name):
              LOG.info("Service network %s, returning", query_net.name)
              return
          # Send network delete request to neutron
          try:
              del_net = self.network.pop(query_net.network_id)
              self.neutronclient.delete_network(query_net.network_id)
              self.delete_network_db(query_net.network_id)
          except Exception as exc:
              # Failed to delete network.
              # Put back the entry to the local cache???
              self.network[query_net.network_id] = del_net
              LOG.exception('dcnm_network_delete_event: Failed to delete '
                            '%(network)s. Reason %(err)s.',
                            {'network': query_net.name, 'err': str(exc)})
docs: Process network delete event from DCNM.