SF Aware TE Topology YANG Model
draft-ietf-teas-sf-aware-topo-model-00

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Network Working Group                                         I. Bryskin
Internet-Draft                                       Huawei Technologies
Intended status: Informational                                    X. Liu
Expires: December 6, 2018                                          Jabil
                                                            June 4, 2018

                    SF Aware TE Topology YANG Model
                 draft-ietf-teas-sf-aware-topo-model-00

Abstract

   This document describes a YANG data model for TE network topologies
   that are network service and function aware.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on December 6, 2018.

Copyright Notice

   Copyright (c) 2018 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Bryskin & Liu           Expires December 6, 2018                [Page 1]
Internet-Draft          SF Aware Topo YANG Model               June 2018

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
     1.2.  Tree Diagrams . . . . . . . . . . . . . . . . . . . . . .   3
     1.3.  Prefixes in Data Node Names . . . . . . . . . . . . . . .   3
   2.  Modeling Considerations . . . . . . . . . . . . . . . . . . .   3
   3.  Model Structure . . . . . . . . . . . . . . . . . . . . . . .   4
   4.  YANG Modules  . . . . . . . . . . . . . . . . . . . . . . . .   6
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  13
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  14
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  14
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .  14
     7.2.  Informative References  . . . . . . . . . . . . . . . . .  15
   Appendix A.  Companion YANG Model for Non-NMDA Compliant
                Implementations  . . . . . . . . . . . . . . . . . .  16
     A.1.  SF Aware TE Topology State Module . . . . . . . . . . . .  16
   Appendix B.  Data Examples  . . . . . . . . . . . . . . . . . . .  18
     B.1.  A Topology with Multiple Connected Network Functions  . .  18
     B.2.  A Topology with an Encapsulated Network Service . . . . .  23
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  27

1.  Introduction

   Today a network offers to its clients far more services than just
   connectivity across the network.  Large variety of physical, logical
   and/or virtual service functions, network functions and transport
   functions (collectively named in this document as SFs) could be
   allocated for and assigned to a client.  As described in
   [I-D.bryskin-teas-use-cases-sf-aware-topo-model], there are some
   important use cases, in which the network needs to represent to the
   client SFs at the client's disposal as topological elements in
   relation to other elements of a topology (i.e. nodes, links, link and
   tunnel termination points) used by the network to describe itself to
   the client.  Not only would such information allow for the client to
   auto-discover the network's SFs available for the services
   provisioned for the client, it would also allow for the client
   selecting the SFs, duel-optimizing the selection on the SF location
   on the network and connectivity means (e.g.  TE tunnels) to inter-
   connect the SFs.  Consequently thus would give to both the network
   and the client powerful means for the service function chain (SFC
   [RFC7498] [RFC7665]) negotiation to achieve most efficient and cost
   effective (from the network point of view) and most optimal yet
   satisfying all necessary constraints of SFCs(from the client's point
   of view).

   This document defines a YANG data model that allows service functions