Ch 01 --- introduction to sdn-nfv

NDI Communications - Engineering & Training

SDN & NFV

Chapter 1 - Introduction

Chapter Content

Motivation and concepts

Software-Defined Networking (SDN) and

OpenFlow

NFV Concept

SDN vs. NFV

2

What are SDN, NFV and OpenFlow?

SDN – Software Defined

Networking is a new network

architecture from the Open

Networking organization

OpenFlow is an open protocol that

is used as part of the SDH

architecture

Virtual Services

Virtual Services

Virtual Services

LAN Switch

LAN Switch

LAN Switch

LAN Switch

LAN Switch

Controller

SDN Architecture

Open Networking

Foundation (ONF) launched

publicly in March, 2011

The ONF defines OpenFlow

and API specifications

Founding members:

The Traditional Network: The OSI - Reference Model

LANLAN

Bit stream

OH Data EIP (L3)

OH Data ETCP (L4)

OH Data EHTTP (L-5/6/7)

OH Data EETH (L2)

Bit stream

OH Data E

OH Data E

OH Data E

OH Data ESDH (L2)

Bit stream

OH Data E

OH Data E

OH Data E

WAN

OH Data EETH (L2)

L1

The Traditional Network: Structure & Components

Closed/proprietary equipment

Software bundled with hardware

Vendor-specific interfaces

Protocols development

Slow protocol standardization

Only few companies can innovate

Equipment vendors write the code

Long time to introduce new features

Few market leaders (one?)

Low flexibility

Devices stay the same

Limited functionality in a device

The Traditional Network Architecture

Data Plane

Control Plane

Management Plane

Data Plane

Control Plane

Management Plane

User data

Control data

ManagementSystem

Management data

Data NetworkNENE

SDN Network Architecture

Data Plane

Control Plane

Management Plane

Data PlaneUser data

Open Flow Protocol

ManagementSystem

Management data

Architecture:• Separate Control plane and

Data plane • Control plane software on

general purpose hardware• Programmable data planes• Applications access to

network

Data Network

Applications access through APIs

Controller

SDN/NFV: The Purpose

1. Centralized management and control of

networking devices from multiple vendors

2. Improved automation and management by

using common APIs

3. Rapid innovation through standard device

configuration

4. Programmability by operators, enterprises,

independent software vendors and users

Data Plane

Control Plane

Management Plane

Data PlaneUser data

Open Flow Protocol

Control System

Control data

Data Network

Applications access through APIs

1

2

3

4

Chapter Content



OpenFlow

NFV Concept

SDN vs. NFV

10

SDN Architecture

Application Layer

Control Layer

Data Layer

Business ApplicationBusiness Application

Business Application

Control Software(Controller)

Network Device

Network Device

Network Device

APIs

OpenFlow

What is OpenFlow

OpenFlow is a standard communications interface defined

between the control and forwarding layers of an SDN

architecture.

Control Software(Controller)

Network Device

Network Device

Network Device

OpenFlow

The OpenFlow protocol is

implemented on both

sides of the interface

between network

infrastructure devices

and the SDN control

software.

Standard Bodies

Open Networking Foundation

http://www.openflow.org/

https://www.opennetworking.org/

IETF

http://tools.ietf.org/html/draft-

nadeau-sdn-problem-statement-00

http://tools.ietf.org/html/draft-

nadeau-sdn-framework-01

Chapter Content



OpenFlow

NFV Concept

SDN vs. NFV

14

NFV – Network Function Virtualization

Network Functions Virtualization

(NFV) is a network architecture

concept that proposes using IT

virtualization related

technologies to virtualize entire

classes of network node

functions into building blocks

that may be connected, or

chained, together to create

communication services

VNF VNF VNF

Virtualization layer

Hardware layer

Virtualized Network Functions (VNFs)

NFV Infrastructure (NFVi)

HDHD

HDHD

NFV M

anagement

and O

rchest

ration

Traditional Networks

Every device in the network has it’s own functionality – router,

firewall, load balancer etc.

Multiple vendors, with multiple protocols, for example: Cisco

Juniper routers, Checkpoint and PaloAlto firewalls, radware and

F5 load balancers etc.

Network Function Virtualization (NFV)

Switch Switch Switch Switch Switch Switch

FW

R

RSBC

R

RRLB

Software implementation of network

Network functions modules

Implementation in virtual machines

Standard APIs between modules

Motivation for NFV

Virtualization: Use network resource without physical

dependency

Orchestration: Manage thousands of devices to provide network

functionality

Programmable: Should be able to change behavior on the fly.

Dynamic Scaling: Should be able to change size, quantity of

flows and more

Why NFV (Cont.)

Visibility: Monitor resources, connectivity

Performance: Optimize network device utilization

Multi-tenancy: multiple users with various requirements working

on the same network

Openness: Full choice of Modular plug-ins

Chapter Content



OpenFlow

NFV Concept

SDN vs. NFV

SDN vs. NFV

SDN NFV

Origin Started in the campus and data centers

Developed by Telco’s for Telco's

Where in the network

Layers 2-3 optimization Layers 3-7 optimization

Standards Open Networking Foundation (ONF)

European Telecommunications Standards Institute (ETSI)

How Separation of forwarding from control

Separation of hardware from software

Applications Data centers and cloud orchestration

Routers, FWs, LBs, CDNs, WAN Acceleration

Open source projects and commercial implementations

Function Implementations

Virtualization Framework for Telco: turns network elements (router, firewall, DNS, HSS, PCRF etc.) into software applications

Number of trials:• Virtual EPC• Virtual RAN

Operating System for Cloud: controls pools of storage, compute and networking resources in a virtualized data center

• AWS• Microsoft Azure• VMware vCloud Air

SDN Controller: a set of common APIs that implements one or more protocols for command and control of the physical hardware within the network

• VMware NSX• Cisco ACI

SDN Protocol: enables the SDN Controller to determine how packets will travel through a network of switches and routers

Cisco OpFlex

Summary

Yoram Orzach

[email protected]

Thank You!!!

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