Yang model for requesting Path Computation
draft-ietf-teas-yang-path-computation-08
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Replaces draft-busibel-teas-yang-path-computation
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TEAS Working Group                                     Italo Busi (Ed.)
Internet Draft                                                   Huawei
Intended status: Standard Track                    Sergio Belotti (Ed.)
Expires: June 2020                                                Nokia
                                                           Victor Lopez
                                                             Telefonica
                                                          Anurag Sharma
                                                                 Google
                                                                Yan Shi
                                                           China Unicom

                                                      December 10, 2019

                Yang model for requesting Path Computation
               draft-ietf-teas-yang-path-computation-08.txt

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Internet-Draft        Yang for Path Computation           December 2019

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Abstract

   There are scenarios, typically in a hierarchical SDN context, where
   the topology information provided by a TE network provider may not
   be sufficient for its client to perform end-to-end path computation.
   In these cases the client would need to request the provider to
   calculate some (partial) feasible paths.

   This document defines a YANG data model for a stateless RPC to
   request path computation. This model complements the stateful
   solution defined in [TE-TUNNEL].

   Moreover this document describes some use cases where a path
   computation request, via YANG-based protocols (e.g., NETCONF or
   RESTCONF), can be needed.

Table of Contents

   1. Introduction...................................................3
      1.1. Terminology...............................................5
   2. Use Cases......................................................5
      2.1. Packet/Optical Integration................................5
      2.2. Multi-domain TE Networks.................................10
      2.3. Data center interconnections.............................12
      2.4. Backward Recursive Path Computation scenario.............14
      2.5. Hierarchical PCE scenario................................15
   3. Motivations...................................................17
      3.1. Motivation for a YANG Model..............................17
         3.1.1. Benefits of common data models......................17

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Internet-Draft        Yang for Path Computation           December 2019

         3.1.2. Benefits of a single interface......................18
         3.1.3. Extensibility.......................................19
      3.2. Interactions with TE Topology............................19
         3.2.1. TE Topology Aggregation.............................20
         3.2.2. TE Topology Abstraction.............................23
         3.2.3. Complementary use of TE topology and path computation24
      3.3. Stateless and Stateful Path Computation..................27
         3.3.1. Temporary reporting of the computed path state......29
   4. Path Computation and Optimization for multiple paths..........31
   5. YANG Model for requesting Path Computation....................32
      5.1. Synchronization of multiple path computation requests....32
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