Extensions to Path Computation Element Protocol (PCEP) to Support Resource Sharing-based Path Computation
draft-zhang-pce-resource-sharing-07

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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
                                                                       
 
Expires: March 3, 2019                            September 3, 2018 
                                    
                                    
                                    
    Extensions to Path Computation Element Protocol (PCEP) to Support 
                Resource Sharing-based Path Computation 
                                    
                                    
                  draft-zhang-pce-resource-sharing-07.txt 

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   Copyright (c) 2018 IETF Trust and the persons identified as the    
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draft-zhang-pce-resource-sharing-07.txt                   September 2018 

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   publication of this document. Please review these documents 
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Requirements Language 

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",   
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this   
   document are to be interpreted as described in [RFC2119]. 

Abstract 
 
   Resource sharing in a network means two or more Label Switched Paths 
   (LSPs) use common piece(s) of resource along their paths. This can 
   help save network resource 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. Given this feature and its access to the 
   network resource information and possibly active LSPs information, 
   it can be used to support resource-sharing-based path computation 
   with better efficiency. 

   This document extends the Path Computation Element Protocol (PCEP) 
   in order to support resource sharing-based path computation.  

Table of Contents 

   1. Introduction and Motivation.................................. 3 
   2. Motivation .................................................. 4 
      2.1. Single PCE Use Case..................................... 4 
      2.2. Multiple PCEs Use Case.................................. 6 
   3. Extensions to PCEP .......................................... 8 
      3.1. Association group and type.............................. 8 
      3.2. Resource Sharing TLV.................................... 8 
      3.3. Processing Rules....................................... 10 
   4. Security Considerations..................................... 11 
   5. IANA Considerations ........................................ 11 
      5.1. Association Object Type Indicators .................... 11 
   6. References ................................................. 12 
      6.1. Normative References................................... 12 
 
 
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      6.2. Informative References................................. 13 
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