Several protocols might be used for Label Distribution in an MPLS network, e.g. Label Distribution Protocol (LDP), including the part of LDP described in Constraint-Based LSP Setup using LDP, the BGP-4 and RSVP. The functionality defined in those protocols are to some extent overlapping, but also complementary. This document specifies a number of MPLS Capability sets that can be used to define what is needed from an MPLS implementation in order to interwork with other implementations. The number of Capability sets might change in the future. It has been frequently noted that the functionality supported by the most of the specifications of how you do Label Distribution, for most applications, are richer than necessary. MPLS implementations implementing parts of one specification or a mix of parts from several specifications will be viable.
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