code: def req_rr_to_non_rtc_peers(self, route_family):
          
          assert route_family != RF_RTC_UC
          for peer in self._peers.values():
              # First check if peer is in established state
              if (peer.in_established and
                  # Check if peer has valid capability for given address
                  # family
                      peer.is_mbgp_cap_valid(route_family) and
                  # Check if peer has valid capability for RTC
                      not peer.is_mbgp_cap_valid(RF_RTC_UC)):
                  peer.request_route_refresh(route_family)
docs: Makes refresh request to all peers for given address family.
  
          Skips making request to peer that have valid RTC capability.