The Path Computation Element (PCE) facilitates Traffic Engineering
(TE) based path calculation in large, multi-domain, multi-region, or
multi-layer networks. [Stateful-PCE] provides the fundamental PCE
communication Protocol (PCEP) extensions needed to support stateful
PCE functions, without specifying the technology-specific extensions.
This memo provides extensions required for PCEP so as to enable the
usage of a stateful PCE capability in GMPLS-controlled networks.