The Path Computation Element (PCE) provides path computation
functions in support of traffic engineering in Multiprotocol Label
Switching (MPLS) and Generalized MPLS (GMPLS) networks.
MPLS and GMPLS networks may be constructed from layered service
networks. It is advantageous for overall network efficiency to
provide end-to-end traffic engineering across multiple network layers
through a process called inter-layer traffic engineering. PCE is a
candidate solution for such requirements.
The PCE communication Protocol (PCEP) is designed as a communication
protocol between Path Computation Clients (PCCs) and PCEs. This
document presents PCEP extensions for inter-layer traffic engineering.