Extensions to the Path Computation Element Protocol (PCEP) to Support Resource Sharing-based Path Computation
draft-zhang-pce-resource-sharing-11

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Last updated 2019-10-23
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PCE Working Group                                            Xian Zhang 
Internet Draft                                            Haomian Zheng 
Category: Standards track                           Huawei Technologies 
                                                 Oscar Gonzales de Dios  
                                                           Victor Lopez 
                                                         Telefonica I+D
                                                              Yunbin Xu 
                                                                  CAICT 
 
Expires: April 24, 2020                                October 24, 2019 
 
                                    
                                    
  Extensions to the Path Computation Element Protocol (PCEP) to Support 
                Resource Sharing-based Path Computation 
                                    
                                    
                    draft-zhang-pce-resource-sharing-11 

Abstract 

   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. 

Status of this Memo 

   This Internet-Draft is submitted to IETF in full conformance with   
   the provisions of BCP 78 and BCP 79. 

   Internet-Drafts are working documents of the Internet Engineering   
   Task Force (IETF), its areas, and its working groups.  Note that   
   other groups may also distribute working documents as Internet-   
   Drafts. 

 
 
 
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draft-zhang-pce-resource-sharing-11                   October 2019 

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Table of Contents 

   1. Introduction and Motivation .................................. 3 
      1.1. Requirements Language ................................... 4 
   2. Motivation ................................................... 5 
      2.1. Single Domain Use Case .................................. 5 
      2.2. Multiple Layers/Domains Use Case ........................ 6 
      2.3. Bulk Path Computation Use Case .......................... 8 
   3. Extensions to PCEP ........................................... 9 
      3.1. Association Group and Type .............................. 9 
      3.2. Resource Sharing TLV ................................... 10 
      3.3. Processing Rules ....................................... 11 
   4. Implementation Status ....................................... 12 
   5. Manageability Considerations ................................ 12 
      5.1. Control of Function and Policy ......................... 12 
      5.2. Information and Data Models ............................ 12 
      5.3. Liveness Detection and Monitoring ...................... 13 
      5.4. Verify Correct Operations .............................. 13 
      5.5. Requirements on Other Protocols ........................ 13 
 
 
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