A Forward-Search P2P TE LSP Inter-Domain Path Computation
draft-chen-pce-forward-search-p2p-path-computation-19

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PCE Working Group                                                H. Chen
Internet-Draft                                                 Futurewei
Intended status: Standards Track                           July 10, 2020
Expires: January 11, 2021

       A Forward-Search P2P TE LSP Inter-Domain Path Computation
         draft-chen-pce-forward-search-p2p-path-computation-19

Abstract

   This document presents a forward search procedure for computing paths
   for Point-to-Point (P2P) Traffic Engineering (TE) Label Switched
   Paths (LSPs) crossing a number of domains using multiple Path
   Computation Elements (PCEs).  In addition, extensions to the Path
   Computation Element Communication Protocol (PCEP) for supporting the
   forward search procedure are described.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on January 11, 2021.

Copyright Notice

   Copyright (c) 2020 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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Chen                    Expires January 11, 2021                [Page 1]
Internet-Draft           Forward Search P2P Path               July 2020

   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Conventions Used in This Document . . . . . . . . . . . . . .   4
   4.  Requirements  . . . . . . . . . . . . . . . . . . . . . . . .   4
   5.  Forward Search Path Computation . . . . . . . . . . . . . . .   5
     5.1.  Overview of Procedure . . . . . . . . . . . . . . . . . .   5
     5.2.  Description of Procedure  . . . . . . . . . . . . . . . .   5
     5.3.  Processing Request and Reply Messages . . . . . . . . . .   8
   6.  Comparing to BRPC . . . . . . . . . . . . . . . . . . . . . .   9
   7.  Extensions to PCEP  . . . . . . . . . . . . . . . . . . . . .   9
     7.1.  RP Object Extension . . . . . . . . . . . . . . . . . . .   9
     7.2.  NODE-FLAGS Object . . . . . . . . . . . . . . . . . . . .  10
       7.2.1.  PREVIOUS-NODE TLV . . . . . . . . . . . . . . . . . .  11
       7.2.2.  DOMAIN-ID TLV . . . . . . . . . . . . . . . . . . . .  11
       7.2.3.  PCE-ID TLV  . . . . . . . . . . . . . . . . . . . . .  12
     7.3.  Candidate Node List . . . . . . . . . . . . . . . . . . .  13
     7.4.  Result Path List  . . . . . . . . . . . . . . . . . . . .  14
     7.5.  Request Message Extension . . . . . . . . . . . . . . . .  14
     7.6.  Reply Message Extension . . . . . . . . . . . . . . . . .  15
   8.  Suggestion to improve performance . . . . . . . . . . . . . .  15
   9.  Manageability Considerations  . . . . . . . . . . . . . . . .  15
     9.1.  Control of Function and Policy  . . . . . . . . . . . . .  15
     9.2.  Information and Data Models . . . . . . . . . . . . . . .  15
     9.3.  Liveness Detection and Monitoring . . . . . . . . . . . .  15
     9.4.  Verify Correct Operations . . . . . . . . . . . . . . . .  15
     9.5.  Requirements On Other Protocols . . . . . . . . . . . . .  16
     9.6.  Impact On Network Operations  . . . . . . . . . . . . . .  16
   10. Security Considerations . . . . . . . . . . . . . . . . . . .  16
   11. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  16
     11.1.  Request Parameter Bit Flags  . . . . . . . . . . . . . .  16
     11.2.  New PCEP Object  . . . . . . . . . . . . . . . . . . . .  16
       11.2.1.  NODE-FLAGS Object  . . . . . . . . . . . . . . . . .  16
     11.3.  New PCEP TLV . . . . . . . . . . . . . . . . . . . . . .  17
       11.3.1.  DOMAIN-ID TLV  . . . . . . . . . . . . . . . . . . .  17
   12. Acknowledgement . . . . . . . . . . . . . . . . . . . . . . .  17
   13. References  . . . . . . . . . . . . . . . . . . . . . . . . .  18
     13.1.  Normative References . . . . . . . . . . . . . . . . . .  18