Internet DRAFT - draft-shytyi-opsawg-vysm

draft-shytyi-opsawg-vysm







Network Working Group                                          D. Shytyi
Internet-Draft                                                L. Beylier
Intended status: Informational                                       SFR
Expires: May 1, 2020                                          L. Iannone
                                                       Telecom ParisTech
                                                        October 29, 2019


                   A YANG Module for uCPE management.
                      draft-shytyi-opsawg-vysm-06

Abstract

   This document provides a YANG data model for uCPE management (VYSM)
   and definition of the uCPE equipment.  The YANG Service Model serves
   as a base framework for managing an universal Customer-Premises
   Equipment (uCPE) subsystem.  The model can be used by a Network
   Service Orchestrator.

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
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   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
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   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 May 1, 2020.

Copyright Notice

   Copyright (c) 2019 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



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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   2
   3.  Universal CPE . . . . . . . . . . . . . . . . . . . . . . . .   3
     3.1.  uCPE purpose  . . . . . . . . . . . . . . . . . . . . . .   4
     3.2.  uCPE VNF ecosystem example  . . . . . . . . . . . . . . .   4
     3.3.  Internal uCPE service example . . . . . . . . . . . . . .   5
   4.  YANG Service Model for uCPE management  . . . . . . . . . . .   5
   5.  uCPE YANG Service Model tree diagram overview . . . . . . . .   7
   6.  Specification of the VNF YANG Service Model . . . . . . . . .   8
   7.  XML example . . . . . . . . . . . . . . . . . . . . . . . . .  13
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .  16
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  16
   10. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  16
   11. Normative References  . . . . . . . . . . . . . . . . . . . .  17
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  17

1.  Introduction

   Network Function Virtualization is a technology that allows to
   virtualize the network services running on dedicaded hardware.  This
   technology became a base for universal Customer-Premises Equipment
   (uCPE).  This document defines the uCPE as harware with x86
   capabilities that has a hypervisor.  In other words, uCPE is a host
   that may run multiple Virtual Machines with guest OSs, where each
   Guest OS may represent a Physical Network Function.  This document
   presents the YANG Service Model (VYSM) to manage from an Orchestrator
   the infrastructure inside the uCPE.

2.  Terminology

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [RFC2119].

   Link - is an entity that enables link layer communication of nodes.

   Port - node connector to the link.

   NE - Network Element.

   NSYM - Network Service Yang Module.

   VYSM - VNF YANG Service Model.



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3.  Universal CPE

   Firstly, this document defines the platform that is controlled with
   VYSM - universal CPE (uCPE).  The uCPE as harware with x86
   capabilities that is generally running Linux distibution with
   additinal virtualisation layer.  Virtualization layer provides
   virtual compute, virtual storage and virtual network resources.  Each
   VNF runnning in the uCPE requires the amount of virtual resources
   (for example: 4 vCPUs, 4GB RAM, 40GB storege, 4 vPorts).  VNFs MAY be
   interconnected between each other and physical ports via Virtual
   Networks.  Topology construction and VM lifecycle management is
   allowed via high level interface (Configuration can be done in the
   same transaction).  The figure below presents the uCPE architecture.


         ----------------------------------------|--------------
         VNF1            VNF2            VNF3    |
         ----------------------------------------|
         Virtual         Virtual         Virtual | uCPE software
         Compute         Storage         Networks|
         ----------------------------------------|---------------
         PHY x86         RAM+PHY         PHYsical| uCPE Hardware
         processor       storage         ports   |




   The next elements can be managed in the uCPE:

   o  Virtual Network Funcitons:

      *  Number of assigned vCPUs.

      *  Size of allocated RAM.

      *  VNF day0 config (bootstrap).

      *  vLinks that are attached to the VNF.

   o  Virtual Switches:

      *  vLinks that are attached to the vSW.

   o  Virtual Links(vLinks).

   o  Physical Ports of the uCPE.





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3.1.  uCPE purpose

   o  uCPE replaces multiple types of equipment (Node#1 - Node#5) with 1
      unit by virtualizing them as Virtual Network Functions on the top
      of NFVIs:


     :      NODE #1     :   NODE #2 :  NODE #3  :NODE #4: NODE #5  :
     :    +-----------+ :  +------+ :  +------+ :  +--+ :  +-----+ :
  ...-----|Aggregation|----|CE-L2 |----| CE-L3|----|FW|----|SDWAN|---LAN
     :    |  switch   | :  |      | :  |      | :  |  | :  |     | :
     :    +-----------+ :  +------+ :  +------+ :  +--+ :  +-----+ :



    :      NODE #1   :           NODE #2                           :
    :                : +.........................................+ :
    :  +-----------+ : |  +------+    +------+    +--+   +-----+ | :
 ...---|Aggregation|---|--|CE-L2 |----| CE-L3|----|FW|---|SDWAN|-|---LAN
    :  |  switch   | : |  |      |    |      |    |  |   |     | | :
    :  +-----------+ : |  +------+    +------+    +--+   +-----+ | :
    :                : |  universal Customer-Premises Equipment  | :
    :                : +-----------------------------------------+ :


   o  uCPE falicitates the interconnection between the Network Funtions
      (NF) as interconnection between NF is performed via virtual
      links(that is part of the uCPE management).  That meens that no
      need to hire technichian to cable the equipment, it could be done
      via orchestrator.

   o  uCPE falicitates the 0day configuration of the VNFs as its 0day
      configuration can be putted remotely.

3.2.  uCPE VNF ecosystem example

   uCPE supports a Virtual Network Funcitons of different type:

   o  SD-WAN

   o  vRouter(vCPE)

   o  vFirewall

   o  vLB(vLoad Balancer)

   o  vCGNAT(vCarrier Grade NAT)




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   o  virtual WAN Optimistaion

   o  vWireless LAN controller

   o  Other...

3.3.  Internal uCPE service example

   The VNF in the uCPE could be a vRouter or vFirewall or an SD-WAN that
   is not a default part of virtual network resources of the uCPE.
   Multiple VNFs MAY be instantiated in the uCPE.  With support of links
   and swithes, VNFs MAY participate a service chains.  Example of
   service chains (Note that virtual switch "vs(WAN)" connected to LAN
   ports and vSW(WAN) is connected to WAN ports):

   o  vSW(WAN)-l1-vRouter(vCPE)-l2-vSW(LAN).

   o  vSW(WAN)-l1-vRouter(vCPE)-l2-vSW(Service)-l3-vFirewall-
      l4-vSW(LAN).

   o  vSW(WAN)-l1-vRouter(vCPE)-l2-vSW(Service1)-l3-vFirewall-l4-
      vSW(Service2)-l5-SD-WAN-l6-vSW(LAN).

   o  vSW(WAN)-l1-SDWAN-l2-vSW(Service)-l3-vFirewall-l4-vSW(LAN).

   o


         vSW(WAN1)--vRouter--+
                             +--vLoadBalance  vFirewall--vSW(LAN)
         vSW(WAN2)--vRouter--+     |              |
                                   +-vSW(Service1)+


   o


      vSW(WAN1)--vRouter(ISP1)--+
                                +--SD-WAN        vFirewall--vSW(LAN)
      vSW(WAN2)--vRouter(ISP2)--+     |              |
                                      +-vSW(Service1)+


4.  YANG Service Model for uCPE management

   Secondly, this document defines and classifies the VYSM as Network
   Service YANG Module(NSYM) layer component RFC 8199 [RFC8199].  Thus
   it inherits the characteristics of the NSYM Layer.  VYSM is a modeled



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   representation of the specific service requirements.  It provides
   abstraction of services configuration and operations that MAY be
   implemented in Network Elemets (NEs).  Thus VYSM does not describe
   all configuration to be performed on the devices, but provides the
   configuration that is required for the "Network Service to Network
   Element(s)" decomposition process RFC 8199 [RFC8199].  Example of the
   decomposition is presented in the figure below.

   The Network Service YANG module exposes the configuration commands
   via the Northbound interfaces of the orchestrator.  Therefore the set
   of the commands modeled in the VYSM can be inputed via Notrhbound
   interfaces(for example CLI).  In the example the command "vm VNF1" is
   passed via Northbound interface to the orchestrator.  It defines the
   virtual machine name.  Further the same configuration MAY be
   transormed to the one or multiple Network Element payloads (for
   example xml for NETCONF) that carry an equivalent of commands such as
   "nf nf-name VNF1"


































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                                +-+-+-+-+-+-+-+-+-+
                                |                 |
                                |  config t       |
                                |      vm VNF1    |
                                +-+-+-+-+-+-+-+-+-+
                                         #
                                         #
   ++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   :                                                                   :
   :  +-+-+-+-+-+-+-+-+-+-+-+-+-+-++-+-+-+                             :
   :  |  Network Service YANG Module     |                             :
   :  +-+-+-+-+-+-+-+-+-+-+-+-+-+-++-+-+-+                             :
   :                   #                                               :
   :     ##############################               orchestrator     :
   :     #             #              #                                :
   : '---------' '------------' '-----------'                          :
   : 'Module1  ' ' Module 2   ' '  Module3  ' <= Network Element       :
   : '---------' '------------' '-----------'    YANG Modules          :
   :      #             #               #                              :
   :      #             #               #######################        :
   :      ####          ##############                        #        :
   :         #                       #                        #        :
   ++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
             #                       #                        #
    Network  #  element 1    Network # element 2      Network # element3
   ++-+-+-+-+-+-+-+-+-+-+  -+-+-+-++-+-+-+-+-+-+-+-+-  +-+-+-+-+-+-+-+-+
   | domains domain VNF1|  |tenants tenant name VNF1|  |nf nf-name VNF1|
   ++-+-+-+-+-+-+-+-+-+-+  -+-+-+-++-+-+-+-+-+-+-+-+-  +-+-+-+-+-+-+-+-+



5.  uCPE YANG Service Model tree diagram overview

   This section provides an overview of the Service YANG Model (VSYM)
   that MAY be made with "pyang" utility.  The figure below presents the
   tree diagram of VYSM.















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             module: ietf-ucpe
                 +--rw ucpe* [name]
                    +--rw name             string
                    +--rw links* [link]
                    |  +--rw link    string
                    +--rw phyInterfaces* [interface]
                    |  +--rw interface    string
                    |  +--rw ports* [port]
                    |     +--rw port    string
                    |     +--rw link?   -> ../../../links/link
                    +--rw switches* [switch]
                    |  +--rw switch    string
                    |  +--rw ports* [port]
                    |     +--rw port    string
                    |     +--rw name?   string
                    |     +--rw link?   -> ../../../links/link
                    +--rw vms* [vm]
                       +--rw vm             string
                       +--rw ports* [port]
                       |  +--rw port    string
                       |  +--rw name?   string
                       |  +--rw link?   -> ../../../links/link
                       +--rw ram?           uint64
                       +--rw cpu?           uint64
                       +--rw storages* [id]
                       |  +--rw id          string
                       |  +--rw location?   string
                       +--rw day0-config
                          +--rw location?        string
                          +--rw day0-var-path?   string
                          +--rw variable* [name]
                             +--rw name     string
                             +--rw value?   string


6.  Specification of the VNF YANG Service Model

   This section presents the specification of the VYSM.


    <CODE BEGINS> file "ietf-ucpe@2019-10-28.yang"
    module ietf-ucpe {
      namespace "urn:ietf:params:xml:ns:yang:ietf-ucpe";
      prefix ietf-ucpe;

      organization
        "SFR";
      contact



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        "Dmytro Shytyi
         EMail:ietf.dmytro@shytyi.net";
      description
        "This is a Network Function Virtualization (NFV) YANG
         service model.

         Copyright (c) 2019 IETF Trust and the persons identified as
         authors of the code.  All rights reserved.

         Redistribution and use in source and binary forms, with or
         without modification, is permitted pursuant to, and subject to
         the license terms contained in, the Simplified BSD License set
         forth in Section 4.c of the IETF Trust's Legal Provisions
         Relating to IETF Documents
         (https://trustee.ietf.org/license-info).

         This version of this YANG module is part of RFC XXXX
         (https://www.rfc-editor.org/info/rfcXXXX); see the RFC itself
         for full legal notices.";

      revision 2019-10-28 {
        description
          "Yang model with vPorts assigned to the interfaces";
        reference
          "draft-shytyi-opsawg-vysm-05";
      }
      revision 2019-10-19 {
        description
          "Yang model was cleaned. Interfaces added";
        reference
          "draft-shytyi-opsawg-vysm-04";
      }
      revision 2019-09-16 {
        description
          "Added 0day config for VNFs.
           Yang model modified according
           to the received comments.";
        reference
          "draft-shytyi-opsawg-vysm-00";
      }
      revision 2018-01-07 {
        description
          "Initial revision.";
        reference
          "draft-shytyi-netmod-vysm-01";
      }

      list ucpe {



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        key "name";
        leaf name {
          type string;
          description
            "ID of uCPE where
             a service is instantiated";
        }
        list links {
          key "link";
          leaf link {
            type string;
            description
              "Name of the virtual link from the pool
               of the links";
          }
          description
            "Pool of the virtual links that connect VMs and
             Interfaces";
        }
        list phyInterfaces {
          key "interface";
          leaf interface {
            type string;
            description
              "Name of physical interface";
          }
          list ports {
            key "port";
            leaf port {
              type string;
              description
                "Name of the connector";
            }
            leaf link {
              type leafref {
                path "../../../links/link";
              }
              description
                "Link that is connected to
                 the port via connector";
            }
            description
              "Set of the connectors the
               physical interface has";
          }
          description
            "Set of physical interfaces";
        }



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        list switches {
          key "switch";
          leaf switch {
            type string;
            description
              "Name of the forwarding domain";
          }
          list ports {
            key "port";
            leaf port {
              type string;
              description
                "Name of the connector";
            }
            leaf name {
              type string;
              description
                "Name of the
                 subconnector";
            }
            leaf link {
              type leafref {
                path "../../../links/link";
              }
              description
                "Link that is connected to the
                 switch via port";
            }
            description
              "Set of the connectors the
               forwarding domain has";
          }
          description
            "Set of the forwarding domains";
        }
        list vms {
          key "vm";
          leaf vm {
            type string;
            description
              "ID of the Virtual Machine";
          }
          list ports {
            key "port";
            leaf port {
              type string;
              description
                "Name of the connector";



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            }
            leaf name {
              type string;
              description
                "Name of
                 the subconnector";
            }
            leaf link {
              type leafref {
                path "../../../links/link";
              }
              description
                "Link that connects the
                 VM with a switch or Interface
                 via connector";
            }
            description
              "Set of Virtual Machine connectors";
          }
          leaf ram {
            type uint64;
            description
              "Size of RAM to allocate for
               the Guest OS";
          }
          leaf cpu {
            type uint64;
            description
              "Number of vCPUs to
               allocate for the Guest OS";
          }
          list storages {
            key "id";
            leaf id {
              type string;
              description
                "Number of
                 vDisk attached to the VM";
            }
            leaf location {
              type string;
              description
                "External location where
                 the image (ex.qcow2) is saved.";
            }
            description
              "Virtual storge/vDisk
               attached to the Virtual Machine";



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          }
          container day0-config {
            leaf location {
              type string;
              description
                "0day configuration location";
            }
            leaf day0-var-path {
              type string;
              description
                "path of the file
                 that contains the 0day variables";
            }
            list variable {
              key "name";
              leaf name {
                type string;
                description
                  "variable name";
              }
              leaf value {
                type string;
                description
                  "variable value";
              }
              description
                "list of variables";
            }
            description
              "0day configuration:init config";
          }
          description
            "Set of the Virtual Machines configured
             on the universal Customer-Premises Equipment";
        }
        description
          "This is an uCPE management service";
      }
    }

    <CODE ENDS>


7.  XML example

   The XML example below presents the configuration of the next service
   in the uCPE, where: vSW(LAN), vSW(WAN), vSW(Service) - virtual
   switches; l1,l2,l3,l4 - virtual links; VMs represent PNFs (Physical



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   Network Fuctions) that could be bootstrapped with 0day config/
   license.


            +--------+      +-------------+      +------------+
            |vSW(LAN)|--l2--|VNF-vFirewall|--l3--|            |
            +--------+      +-------------+      |            |
            +--------+      +-------------+      |vSW(Service)|
            |vSW(WAN)|--l1--|   VNF_vCPE  |--l4--|            |
            +--------+      +-------------+      +------------+



     <ucpe xmlns="urn:ietf:params:xml:ns:yang:ietf-ucpe">
         <name>ucpe1</name>
         <links>
           <link>l1</link>
         </links>
         <links>
           <link>l2</link>
         </links>
         <links>
           <link>l3</link>
         </links>
         <links>
           <link>l4</link>
         </links>
         <switches>
           <switch>lan</switch>
           <ports>
             <port>10</port>
             <name>l2p10</name>
             <link>l2</link>
           </ports>
         </switches>
         <switches>
           <switch>service</switch>
           <ports>
             <port>10</port>
             <name>l3p10</name>
             <link>l3</link>
           </ports>
           <ports>
             <port>11</port>
             <name>l4p10</name>
             <link>l4</link>
           </ports>
         </switches>



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         <switches>
           <switch>wan</switch>
           <ports>
             <port>10</port>
             <link>l1</link>
           </ports>
         </switches>
         <vms>
           <vm>VNF-vCPE</vm>
           <ports>
             <port>1</port>
             <name>l1p1</name>
             <link>l1</link>
           </ports>
           <ports>
             <port>2</port>
             <name>l4p2</name>
             <link>l4</link>
           </ports>
           <ram>2048</ram>
           <cpu>2</cpu>
           <storages>
             <id>1</id>
             <location>http://192.168.2.1/vCPE-x86.qcow2</location>
           </storages>
           <day0-config>
             <location>https://192.168.2.1/vCPE-day0.iso</location>
             <day0-var-path>/config.rom</day0-var-path>
             <variable>
               <name>hostname</name>
               <value>IETF-vCPE</value>
             </variable>
             <variable>
               <name>ipaddress</name>
               <value>192.168.1.2 255.255.255.0</value>
             </variable>
           </day0-config>
         </vms>
         <vms>
           <vm>VNF-vFirewall</vm>
           <ports>
             <port>1</port>
             <name>l3p1</name>
             <link>l3</link>
           </ports>
           <ports>
             <port>2</port>
             <name>l2p2</name>



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             <link>l2</link>
           </ports>
           <ram>2048</ram>
           <cpu>2</cpu>
           <storages>
             <id>1</id>
             <location>http://192.168.2.1/vFirewall-x86.qcow2</location>
           </storages>
           <day0-config>
             <location>https://192.168.2.1/vFirewall-day0.iso</location>
             <day0-var-path>/config.rom</day0-var-path>
             <variable>
               <name>hostname</name>
               <value>vFirewall</value>
             </variable>
             <variable>
               <name>ipaddress</name>
               <value>192.168.1.3 255.255.255.0</value>
             </variable>
           </day0-config>
         </vms>
       </ucpe>


8.  Security Considerations

   At this time, no security considerations are addressed by this memo.

9.  IANA Considerations

   No request to IANA at this time.

10.  Acknowledgements

   The authors would like to thank:

   o  Mahesh Jethanandani.

   o  Robert Varga.

   o  Bill Wu.

   o  Joe Clarke.

   o  Tom Petch.

   o  Martin Bjorklund.




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   o  Schonwalder Jurgen.

   for their valuable comments.

11.  Normative References

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119,
              DOI 10.17487/RFC2119, March 1997,
              <https://www.rfc-editor.org/info/rfc2119>.

   [RFC8199]  Bogdanovic, D., Claise, B., and C. Moberg, "YANG Module
              Classification", RFC 8199, DOI 10.17487/RFC8199, July
              2017, <https://www.rfc-editor.org/info/rfc8199>.

Authors' Addresses

   Dmytro Shytyi
   SFR
   Paris , Ile-de-France
   France

   Email: ietf.dmytro@shytyi.net
   URI:   https://dmytro.shytyi.net


   Laurent Beylier
   SFR
   Paris , Ile-de-France
   France

   Email: laurent.beylier@sfr.com


   Luigi Iannone
   Telecom ParisTech
   Paris , Ile-de-France
   France

   Email: luigi.iannone@telecom-paristech.fr











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