Network Working Group D. Shytyi
Internet-Draft L. Beylier
Intended status: Informational SFR/ALTICE
Expires: March 7, 2020 L. IANNONE
Telecom ParisTech
September 4, 2019
Virtualization YANG Servise Model (VYSM)
draft-shytyi-netmod-vysm-02
Abstract
This document provides a specification of the Virtual Network
Functions YANG Service Model (VYSM). The VNF YANG Service Model
serves as a base framework for managing an universal Customer-
Premises Equipment (uCPE) NFV subsystem from the Orchestrator.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 2
3. Universal CPE . . . . . . . . . . . . . . . . . . . . . . . . 3
4. Virtual Network Function YANG Service Model . . . . . . . . . 3
5. VNF YANG Service Model tree diagram overview . . . . . . . . 4
6. Specification of the VNF YANG Service Model . . . . . . . . . 5
7. Security Considerations . . . . . . . . . . . . . . . . . . . 9
8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 9
9. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 9
10. Normative References . . . . . . . . . . . . . . . . . . . . 10
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 10
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 (whitebox or greybox) 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 VNF YANG Service Model (VYSM)
to manage from an Orchestrator the Network Function Virtualization
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. 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 |
4. Virtual Network Function YANG Service Model
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
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. VNF YANG Service Model tree diagram overview
This section provides an overview of the VNF 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-vysm
+--rw virtualization* [name]
+--rw name string
+--rw device* string
+--rw links* [link]
| +--rw link string
+--rw interfaces* [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? string
+--rw cpu? string
+--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-vysm@2018-07-01.yang"
module ietf-vysm {
namespace "urn:ietf:params:xml:ns:yang:ietf-vysm";
prefix ietf-vysm;
organization
"SFR/ALTICE";
contact
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"Dmytro Shytyi
EMail:ietf.dmytro@shytyi.net";
description
"This is a Network Function Virtualization (NFV) YANG
service model.";
revision 2018-07-01 {
description
"Initial revision.";
reference
"draft-shytyi-netmod-vysm-01";
}
list virtualization {
key name;
leaf name {
type string;
description "Name of the instance of the service";
}
// may replace this with other ways of refering to the devices.
leaf-list device {
type string;
description "List of the devices in available in the
orchestrator";
}
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 interfaces{
key interface;
leaf interface{
type string;
description "Name of physical interface";
}
list ports{
key port;
leaf port{
type string;
description "Name of the connector";
}
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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";
}
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 "Name of the Virtual Machine";
}
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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 connects the
VM with a switch or Interface
via connector";
}
description "Set of Virtual Machine connectors";
}
leaf ram{
type string;
description "Amount of memory to allocate for
the Guest OS";
}
leaf cpu{
type string;
description "Amount of cpus to allocate for the
Guest OS";
}
list storages{
key id;
leaf id{
type string;
description "Name of the Storage";
}
leaf location{
type string;
description "External location where
the image is saved.";
}
description "Virtual storge of the image
for the Virtual Machine";
}
container day0-config{
leaf location{
type string;
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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 RFS skeleton service";
}
}
}
<CODE ENDS>
7. Security Considerations
At this time, no security considerations are addressed by this memo.
8. IANA Considerations
No request to IANA at this time.
9. Acknowledgements
At this time, no acknowledgements are addressed by this memo.
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10. 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/ALTICE
Paris area , Ile-de-France
France
Email: ietf.dmytro@shytyi.net
URI: http://dmytro.shytyi.net
Laurent Beylier
SFR/ALTICE
Paris area , Ile-de-France
France
LUIGI IANNONE
Telecom ParisTech
Paris , Ile-de-France
France
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