Extensions to the Path Computation Element Protocol (PCEP) to Support Resource Sharing-based Path Computation

Document Type Expired Internet-Draft (individual)
Authors Xian Zhang  , Haomian Zheng  , Oscar de Dios  , Victor Lopez  , Yunbin Xu 
Last updated 2021-10-18 (latest revision 2021-04-16)
Stream (None)
Intended RFC status (None)
Expired & archived
pdf htmlized bibtex
Stream Stream state (No stream defined)
Consensus Boilerplate Unknown
RFC Editor Note (None)
IESG IESG state Expired
Telechat date
Responsible AD (None)
Send notices to (None)

This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


Resource sharing in a network means two or more Label Switched Paths (LSPs) use common pieces of resource along their paths. This can help save network resources and is useful in scenarios such as LSP recovery or when two LSPs do not need to be active at the same time. A Path Computation Element (PCE) is responsible for path computation with such requirement. Existing extensions to the Path Computation Element Protocol (PCEP) allow one path computation request for an LSP to be associated with other (existing) LSPs through the use of the PCEP Association Object. This document extends PCEP in order to support resource-sharing- based path computation as another use of the Association Object to enable better efficiency in the computation and in the resultant paths and network resource usage.


Xian Zhang (zhang.xian@huawei.com)
Haomian Zheng (zhenghaomian@huawei.com)
Oscar de Dios (oscar.gonzalezdedios@telefonica.com)
Victor Lopez (victor.lopezalvarez@telefonica.com)
Yunbin Xu (xuyunbin@caict.ac.cn)

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