RT Constraint is supported only by the base router BGP instance. When the family command at the BGP router group or neighbor CLI context includes the route-target keyword, the RT Constraint capability is negotiated with the associated set of EBGP and IBGP peers.
ORF and RT Constraint are mutually exclusive on a particular BGP session. The CLI does not attempt to block this configuration, but if both capabilities are enabled on a session, the ORF capability is not included in the OPEN message sent to the peer.