Yang model for requesting Path Computation
draft-ietf-teas-yang-path-computation-06
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Last updated 2019-07-08
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: January 2020                                             Nokia

                                                           July 8, 2019

                Yang model for requesting Path Computation
               draft-ietf-teas-yang-path-computation-06.txt

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Busi, Belotti, al.     Expires January 8, 2020                 [Page 1]
Internet-Draft        Yang for Path Computation               July 2019

   carefully, as they describe your rights and restrictions with
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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...............................................4
   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
         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

Busi, Belotti, et al.  Expires January 8, 2020                 [Page 2]
Internet-Draft        Yang for Path Computation               July 2019

   5. YANG Model for requesting Path Computation....................32
      5.1. Synchronization of multiple path computation requests....32
      5.2. Returned metric values...................................34
   6. YANG model for stateless TE path computation..................36
      6.1. YANG Tree................................................36
      6.2. YANG Module..............................................46
   7. Security Considerations.......................................61
   8. IANA Considerations...........................................62
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