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Path Computation Element Communication Protocol (PCEP) extension to advertise the PCE Controlled Identifier Space

Document Type Expired Internet-Draft (individual)
Expired & archived
Authors Cheng Li , Hang Shi , Aijun Wang , Weiqiang Cheng , Chao Zhou
Last updated 2023-11-12 (Latest revision 2023-05-11)
RFC stream (None)
Intended RFC status (None)
Stream Stream state (No stream defined)
Consensus boilerplate Unknown
RFC Editor Note (None)
IESG IESG state Expired
Telechat date (None)
Responsible AD (None)
Send notices to (None)

This Internet-Draft is no longer active. A copy of the expired Internet-Draft is available in these formats:


The Path Computation Element Communication Protocol (PCEP) provides a mechanism for the Path Computation Elements (PCEs) to perform path computations in response to Path Computation Clients (PCCs) requests. The Stateful PCE extensions allow stateful control of Multiprotocol Label Switching (MPLS) Traffic Engineering (TE) Label Switched Paths (LSPs) using PCEP. Furthermore, PCE can be used for computing paths in the SR networks. Stateful PCE provides active control of MPLS-TE LSPs via PCEP, for a model where the PCC delegates control over one or more locally configured LSPs to the PCE. Further, stateful PCE could also create and remove PCE-initiated LSPs by itself. A PCE-based Central Controller (PCECC) simplify the processing of a distributed control plane by integrating with elements of Software-Defined Networking (SDN). In some use cases, such as PCECC or Binding Segment Identifier (SID) for Segment Routing (SR), there are requirements for a stateful PCE to make allocation of labels, SIDs, etc. These use cases require PCE aware of various identifier spaces from where to make allocations on behalf of a PCC. This document describes a generic mechanism for a PCC to inform the PCE of the identifier space set aside for the PCE control via PCEP. The identifier could be an MPLS label, a SID, or any other to-be-defined identifier that can be allocated and managed by the PCE.


Cheng Li
Hang Shi
Aijun Wang
Weiqiang Cheng
Chao Zhou

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)