The standards for MLPPP and MLFR FRF.15 are defined in RFC 1990, The PPP Multilink Protocol (MP), and in FRF.15, End-to-End Multilink Frame Relay Implementation Agreement.
The Multilink Protocol (MP) enables you to split, recombine, and sequence datagrams across multiple logical data links. The goal of multilink operation is to coordinate multiple independent links between a fixed pair of systems, providing a virtual link with greater bandwidth than any of the members. The physical connections must be E1 or T1 interfaces. The Multilink Protocol includes two encapsulation types: Multilink Point-to-Point Protocol (MLPPP) and Multilink Frame Relay (MLFR). The JUNOS software supports both MLPPP and MLFR (FRF.15 ...