resource reservation protocol traffic extension (MPLS) (RSVP-TE)
The RSVP- TE protocol(Resource Reservation Protocol Traffic Extension) is an extension of the Resource Reservation Protocol (RSVP) with object classes for traffic engineering for Multi-Protocol Label Switching( MPLS). The protocol is responsible for the assignment of labels.
It thus offers the same functions as Multi-Protocol Label Switching - Label Distribution Protocol (MPLS- LDP) and Constraint Routing LDP( CR-LDP).