PCEP Extension for Stateful Inter-Domain Tunnels
draft-ietf-pce-stateful-interdomain-01

Document Type Active Internet-Draft (pce WG)
Authors Olivier Dugeon  , Julien Meuric  , Young Lee  , Daniele Ceccarelli 
Last updated 2021-02-22
Replaces draft-dugeon-pce-stateful-interdomain
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Path Computation Element Working Group                         O. Dugeon
Internet-Draft                                                 J. Meuric
Intended status: Standards Track                             Orange Labs
Expires: August 26, 2021                                          Y. Lee
                                                     Samsung Electronics
                                                           D. Ceccarelli
                                                                Ericsson
                                                       February 22, 2021

            PCEP Extension for Stateful Inter-Domain Tunnels
                 draft-ietf-pce-stateful-interdomain-01

Abstract

   This document specifies how to use a Backward Recursive or
   Hierarchical method to derive inter-domain paths in the context of
   stateful Path Computation Element (PCE).  The mechanism relies on the
   PCInitiate message to set up independent paths per domain.  Combining
   these different paths together enables them to be operated as end-to-
   end inter-domain paths, without the need for a signaling session
   between inter-domain border routers.  For this purpose, this document
   defines a new Stitching Label, new Path Setup Types, new Association
   Type, and a new PCEP communication Protocol (PCEP) Capability.

Status of This Memo

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   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on August 26, 2021.

Copyright Notice

   Copyright (c) 2021 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Dugeon, et al.           Expires August 26, 2021                [Page 1]
Internet-Draft      PCE Stateful Inter-Domain Tunnels      February 2021

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  General Assumptions . . . . . . . . . . . . . . . . . . .   4
     1.2.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   6
   2.  Stitching Label . . . . . . . . . . . . . . . . . . . . . . .   7
     2.1.  Definition  . . . . . . . . . . . . . . . . . . . . . . .   7
     2.2.  Inter-domain LSP-TYPE . . . . . . . . . . . . . . . . . .   8
   3.  Backward Recursive PCInitiate Procedure . . . . . . . . . . .   9
     3.1.  Mode of Operation . . . . . . . . . . . . . . . . . . . .   9
     3.2.  Example . . . . . . . . . . . . . . . . . . . . . . . . .  12
     3.3.  Completion Failure of Inter-domain Path Setup Procedure .  13
   4.  Hierarchical PCInitiate Procedure . . . . . . . . . . . . . .  14
     4.1.  Mode of Operation . . . . . . . . . . . . . . . . . . . .  14
     4.2.  Completion Failure of Inter-domain Path Setup Procedure .  16
     4.3.  Example for Stateful H-PCE Stiching Procedure . . . . . .  17
   5.  Inter-domain Path Management  . . . . . . . . . . . . . . . .  21
     5.1.  Stitching Label PCE Capabilities  . . . . . . . . . . . .  21
     5.2.  Identification of Inter-domain Paths  . . . . . . . . . .  22
     5.3.  Inter-domain Association Group  . . . . . . . . . . . . .  23
     5.4.  Modification of Inter-domain Paths  . . . . . . . . . . .  24
     5.5.  Modification of Inter-domain Paths  . . . . . . . . . . .  25
     5.6.  Tear-Down of Inter-domain Paths . . . . . . . . . . . . .  25
   6.  Applicability . . . . . . . . . . . . . . . . . . . . . . . .  25
     6.1.  RSVP-TE . . . . . . . . . . . . . . . . . . . . . . . . .  25
     6.2.  Segment Routing . . . . . . . . . . . . . . . . . . . . .  26
     6.3.  Mixing Technologies . . . . . . . . . . . . . . . . . . .  27
     6.4.  Inter-Area  . . . . . . . . . . . . . . . . . . . . . . .  27
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  28
     7.1.  Path Setup Type Values  . . . . . . . . . . . . . . . . .  28
     7.2.  Association Type Value  . . . . . . . . . . . . . . . . .  28
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