Path Computation Element (PCE) Protocol Extension for Stateful PCE Usage in GMPLS Networks
draft-zhang-pce-pcep-stateful-pce-gmpls-00

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Network Working Group                                        Xian Zhang 
Internet-Draft                                                Young Lee 
Intended status: Standards Track                                 Huawei 
                                                         Ramon Casellas 
                                                                   CTTC 
                                                 Oscar Gonzalez de Dios 
                                                         Telefonica I+D
                                                                    
                                                    
                                                                  
Expires: January 07, 2013                            July 07, 2012 
                                      

                                    
   Path Computation Element (PCE) Protocol Extension for Stateful PCE 
                        Usage in GMPLS Networks 
                                      
              draft-zhang-pce-pcep-stateful-pce-gmpls-00.txt 

Status of this Memo 

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Abstract 
 
 
 
Zhang                   Expires January 2013                  [Page 1] 


draft-zhang-pce-pcep-stateful-pce-gmpls-00.txt                July 2012 
    

   The Path Computation Element (PCE) facilitates Traffic Engineering 
   (TE) based path calculation in large, multi-domain, multi-region, or 
   multi-layer networks. PCE can be stateless or stateful. With the LSP 
   state information acquired from the network, a stateful PCE exhibits 
   superiority in facilitating a wide variety of applications, 
   especially in GMPLS networks, such as impairment-aware routing and 
   wavelength assignment in wavelength-switched optical networks (WSON), 
   time-based scheduling applications. This memo provides extensions 
   required for PCE communication protocol (i.e. PCEP) so as to enable 
   the usage of a stateful PCE capability in GMPLS networks. To be more 
   specific, the PCEP extensions specified in this memo include not 
   only new objects but also modification of existing objects in PCEP 
   messages, with regard to stateful PCE usage in GMPLS networks.  

Conventions used in this document 

   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 RFC-2119 [RFC2119]. 

Table of Contents 

    
   Table of Contents .............................................. 2 
   1. Introduction ................................................ 3 
   2. PCEP Extensions ............................................. 4 
      2.1. Overview ............................................... 4 
      2.2. PCEP Extension for Stateful PCE Capability Advertisement and 
      Negotiation ................................................. 4 
         2.2.1. PCE Capability Negotiation/Advertisement in Multi-layer 
         Networks ................................................. 5 
      2.3. LSP Delegation ......................................... 5 
      2.4. PCEP Extensions for LSP Synchronization .................6 
      2.5. PCEP Simplification .....................................6 
      2.6. Application-specific PCEP extensions for stateful PCE....7 
         2.6.1. Time-based Scheduling.............................. 7 
            2.6.1.1. PCEP Extension................................ 8 
         2.6.2. RWA in Impairment-aware Wavelength-switched Optical 
         Networks (WSON) .......................................... 9 
   3. IANA Considerations ........................................ 10 
      3.1. LayerCapability TLV.................................... 10 
      3.2. SERVICE-TIME Object.................................... 10 
      3.3. Extension to METRIC Object............................. 10 
   4. Manageability Considerations................................ 10 
   5. Security Considerations..................................... 11 
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