Extensions to Path Computation Element Protocol (PCEP) to Support Resource Sharing-based Path Computation
draft-zhang-pce-resource-sharing-02

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PCE Working Group                                          Xian Zhang 
Internet Draft                                            Haomian Zheng  
Category: Standards track                                       Huawei  
                                               Oscar Gonzales de Dios  
                                                            Victor Lopez 
                                                          Telefonica I+D
                                                                       
 
 
Expires: April 25, 2015                            October 25, 2014 
                                    
                                    
                                    
    Extensions to Path Computation Element Protocol (PCEP) to Support 
                Resource Sharing-based Path Computation 
                                    
                                    
                  draft-zhang-pce-resource-sharing-02.txt 

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   Copyright (c) 2014 IETF Trust and the persons identified as the    
   document authors.  All rights reserved. 

 
 
 
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draft-zhang-pce-resource-sharing-02.txt                   October 2014 

   This document is subject to BCP 78 and the IETF Trust's Legal 
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   (http://trustee.ietf.org/license-info) in effect on the date of 
   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 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 a centralized entity, 
   responsible for path computation. 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. Use Case 1 ..................................... 4 
      2.2. Use Case 2 ..................................... 6 
   3. Extensions to PCEP ................................... 7 
      3.1. Resource Sharing Object........................... 8 
      3.2. Processing Rules ................................ 9 
      3.3. Carrying RSO in a PCEP Message..................... 9 
   4. Security Considerations .............................. 10 
   5. IANA Considerations  ................................. 11 
      5.1. New Object Type ................................ 11 
   6. References ........................................ 12 
      6.1. Normative References ............................ 12 
 
 
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      6.2. Informative References........................... 12 
   7. Authors' Addresses  .................................. 13 
 
1. Introduction and Motivation 
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