PCEP Extension for TE Constraints
draft-peng-pce-te-constraints-00

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PCE                                                              S. Peng
Internet-Draft                                                  Q. Xiong
Intended status: Standards Track                         ZTE Corporation
Expires: January 30, 2020                                  July 29, 2019

                   PCEP Extension for TE Constraints
                    draft-peng-pce-te-constraints-00

Abstract

   This document proposes a set of constraints for PCEP to configure PCE
   to use specific virtual network topology or application attributes
   during path computation.  A simple COLOR parameter is also introduced
   to simplify network operations.

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Peng & Xiong            Expires January 30, 2020                [Page 1]
Internet-Draft      PCEP Extension for TE Constraints          July 2019

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions used in this document . . . . . . . . . . . . . .   3
     2.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
     2.2.  Requirements Language . . . . . . . . . . . . . . . . . .   3
   3.  PCEP Extensions for Constraints . . . . . . . . . . . . . . .   3
     3.1.  Source Protocol Object  . . . . . . . . . . . . . . . . .   3
     3.2.  Multi-topology Object . . . . . . . . . . . . . . . . . .   4
     3.3.  The AII Object  . . . . . . . . . . . . . . . . . . . . .   5
     3.4.  Application Specific Object . . . . . . . . . . . . . . .   6
     3.5.  The Color Object  . . . . . . . . . . . . . . . . . . . .   7
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   5.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   8
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
   7.  Normative References  . . . . . . . . . . . . . . . . . . . .   9
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  10

1.  Introduction

   [RFC5440] describes the Path Computation Element Protocol (PCEP)
   which is used between a Path Computation Element (PCE) and a Path
   Computation Client (PCC) (or other PCE) to enable computation of
   Multi-protocol Label Switching (MPLS) for Traffic Engineering Label
   Switched Path (TE LSP).  PCEP Extensions for the Stateful PCE Model
   [RFC8231] describes a set of extensions to PCEP to enable active
   control of MPLS-TE and Generalized MPLS (GMPLS) tunnels.  [RFC8281]
   describes the setup and teardown of PCE-initiated LSPs under the
   active stateful PCE model, without the need for local configuration
   on the PCC, thus allowing for dynamic centralized control of a
   network.

   Till now there are known path computation constraint parameters such
   as metric, bandwidth, delay, affinity, etc.  However all these
   parameters can't meet increasing service requirements.  A PCE always
   perform path computation based on the network topology information
   collected through BGP-LS [RFC7752].  BGP-LS can get multiple link-
   state database from multiple IGP instance, or multiple virtual
   topology from a single IGP instance.  It is necessary to limit PCE to
   a small topology scope during path computation for some special
   purpose.  BGP-LS can also get application specific TE attributes for
   a link, it is also necessary to limit PCE to use TE attributes of
   specific application during path computation.

   This document will extend PCEP to support some new constraint
   parameters during path computation, e.g, IGP instance, virtual
   network, specific application, as well as a simple COLOR parameter.