%% You should probably cite draft-ietf-pce-hierarchy-extensions instead of this I-D. @techreport{zhang-pce-hierarchy-extensions-02, number = {draft-zhang-pce-hierarchy-extensions-02}, type = {Internet-Draft}, institution = {Internet Engineering Task Force}, publisher = {Internet Engineering Task Force}, note = {Work in Progress}, url = {https://datatracker.ietf.org/doc/draft-zhang-pce-hierarchy-extensions/02/}, author = {Fatai Zhang and Quintin Zhao and Oscar Gonzalez de Dios and Ramon Casellas and Adrian Farrel}, title = {{Extensions to Path Computation Element Communication Protocol (PCEP) for Hierarchical Path Computation Elements (PCE)}}, pagetotal = 21, year = 2012, month = jul, day = 16, abstract = {The Hierarchical Path Computation Element (H-PCE) architecture, defined in the companion framework document {[}I-D.ietf-pce-hierarchy- fwk{]}, facilitates to obtain optimum end-to-end, multi-domain paths when the sequence of domains is not known in advance. Such H-PCE architecture allows the selection of an optimum domain sequence and, through the use of a hierarchical relationship between domains, derive the optimum end-to-end path. This document defines the Path Computation Element Protocol (PCEP) extensions for the purpose of implementing Hierarchical PCE procedures which are described the aforementioned document.}, }