code: def _on_update_rt_filter(self, peer, new_rts, old_rts):
          
          for table in self._table_manager._global_tables.values():
              if table.route_family == RF_RTC_UC:
                  continue
              self._spawn('rt_filter_chg_%s' % peer,
                          self._rt_mgr.on_rt_filter_chg_sync_peer,
                          peer, new_rts, old_rts, table)
              LOG.debug('RT Filter change handler launched for route_family %s',
                        table.route_family)
docs: Handles update of peer RT filter.
  
          Parameters:
              - `peer`: (Peer) whose RT filter has changed.
              - `new_rts`: (set) of new RTs that peer is interested in.
              - `old_rts`: (set) of RTs that peers is no longer interested in.