軟體定義網路簡介與發展趨勢

Software Defined Network

Briefs & Trends

ITRI/ICL 楊明曉

Outlines

網路問題&SDN緣起

SDN & Openflow 簡介

NFV with SDN

Reference

Outlines

網路問題&SDN緣起

SDN & Openflow 簡介

NFV with SDN

Reference

Modern Networking Complexity

4Source: Adopted from Javvin

Telco

Operators

Equipment

Vendors

Std. Org.

2-6 Years

Demand

Drive

StandardiseImplement

Sell

Deploy

Critical mass of

supporters

Develop Deploy Publish

2-6 Months

Telco Cycle Wished Providers Cycle

2-6 years 2-6 months

Service Providers

AVAILABLE AVAILABLEIdea !! Idea !!

Source: Adapted from D. Lopez Telefonica I+D, NFV 5

Slow Technology Deployments

Network Tech. Innovation Trend

6Source From Google 2012

(2012)

7

8

9~from : Rohit Mehra "SDN In The Enterprise Campus: Early Adoption"

Stanford Clean Slate Program (2006~2012)

10

1. With what we know today, if we

were to start again with a clean slate,

how would we design a global

communications infrastructure?

2. How should the Internet look in

upcoming 15 years?

Martin Casado Nick Mckeown Scott Shenker

https://en.wikipedia.org/wiki/Clean_Slate_Program

Converged Infrastructure Neededfor Cloud

Compute

Storage

Network

Introduction to OpenFlow, SDN & NFV by Kingston Smiler. S 11

Traditional Computing Vs Modern Computing

Traditional Vs Modern Computing

Provisioning Methods

Source: Adopted from Transforming the Network With Open SDN by Big Switch Network

Traditional vs Modern Networking

Provisioning Methods

Source: Adopted from Transforming the Network With Open SDN by Big Switch Network 14

Telnet

Computing vs Networking Evolution

15Source: Adopted from Transforming the Network With Open SDN by Big Switch Network

http://www.slideshare.net/junipernetworks/interop-tokyo-2013-davidson-keynote-sdnvfinal?related=1 16

Outlines

網路問題&SDN緣起

SDN & Openflow 簡介

NFV with SDN

Reference

ITU-T SDN Concept [Q.21/SG13]

A technology to networking which allows Centralized, Programmable Control Planes so

that network operators can control and manage directly their own Virtualized Networks

(ITU-T sg13 Q21 draft Recommendation Y.FNsdn, 2013)

Software-defined networking

現今網路 SDN網路

Northbound API（尚未標準化）

Southbound APIOpenflow

12

Key SDN concepts Separation of Control and Data plane

Centralizing network ‘Intelligence’

Through one or more Controller device(s)

Enabling a ‘Programmable’ network

Through a control protocol, running between the controller and the

underlying network devices

e.g. using OpenFlow as the control protocol

Highly dynamic，Rapid provisioning

Can be per-flow, On Demand

Network Virtualization enable Network Resource Sharing

19

SDN網路虛擬化特色 SDN VN Management可全由Controller 控管，可避免傳統網路需要複雜地逐一設定每台Switch或

每個網路設備

SDN可以達到 VN Bandwidth Control，確保VN所需的BW (傳統網路僅能設定Queue / Priority等等)

SDN針對VN可以更具彈性地提供Topology Control 以及 Flexible Traffic Control，例如網路發生故障，可以容易動態調整VN Topology達到Protection/Restoration

可大幅度提升網路頻寬使用效率，不受限於Spanning Tree Protocol限制，可大幅提高Link Utilization (e.g. : Close to 100% in Google G-Scale Network )

Network Virtualization are the killer applications for SDN ~ from Nick Lippis (Enterprise IT Industry Analyst)

實體網路

虛擬網路 VN#1 虛擬網路 VN#2 虛擬網路 VN#3

PN : Physical NetworkVN : Virtual Network

20

ONF Openflow Protocol Spec. Roadmap

2010 2011 2012

V1.0.0

資料來源: https://www.opennetworking.org

2013 2014

V1.1

V1.2

V1.3.0

V1.4

V1.0.2V1.0.1

V1.3.1 V1.3.3V1.3.2

V1.3.4

V1.5.1

2015

21

V1.5

Controller

OpenFlow Switch

Flow

Table

Secure

Channel

PC

hw

sw

OpenFlow Switch specification

Components of OpenFlow Network

~From OpenFlow Switch Specification 22

OpenFlow Basics (Flow Table Entries)

SwitchPort

MACsrc

MACdst

Ethtype

VLANID

IPSrc

IPDst

IPProt

L4sport

L4dport

Rule Action Stats

1. Forward packet to zero or more ports2. Encapsulate and forward to controller3. Send to normal processing pipeline4. Modify Fields5. Any extensions you add!

+ mask what fields to match

Packet + byte counters

23

VLANpcp

IPToS

~From OpenFlow Switch Specification

SDN - Opportunity for Value Migration

and Industry Chain Restructuring• SDN can eliminate vendor lock-in

• SDN transforms the vertical networking model into a PC-like horizontal one

• Industry Value : lead by commodity or by high end SI’s or by new network apps

• SDN = commodities ($) + system integration & SDN Services ($$$)

Now

User

SDN

User

Network App

SDN Controller

App軟體

Linux/Windows

PC Hardware box

CPU

~~~~

PC-like Industry Chain

SDN Network Device

SDN Network Chip

Chip

Equipment

System

ASP/SI

SpecializedControlPlane

SpecializedHardware

SpecializedFeatures

Vendor Lock-In

Vertically integrated one-box switch

24

NEC SDN Solution Benefits (1/2)

25~Source from NEC

26

NEC SDN Solution Benefits (2/2)

~Source from NEC

Easy VM Migration

27~Source from NEC

Easy Scale out Initial cost is reduced and scale-out can be realized.

28~Source from NEC

Easy Resource Optimization The complicated data center configuration is simplified by the combination of virtual

servers (VM), virtual switches (VS) and virtual NW appliances. Also dynamic resource

operation can be possible.

29~Source from NEC

NEC SDN Enterprise Solution

可大幅節省網路佈建成本 NEC運用虛擬網路技術讓單一個實體網路可以產生多個子公司所需之虛擬網路

相較傳統各個子公司單獨建置各自網路，SDN 網路虛擬化可大幅降低網路建置成本

~Source adapted from NEC http://goo.gl/NcQu21

網路所需設備大幅降低50%~80%

30

Inter-DC WAN Google use SDN on G-Scale backbone network (2012)

Load balancing

Inter-DC Traffic Engineering

Improve availability & fault tolerance

>95% utilization (original 30%~40%)

http://gigaom.com/cloud/googles-next-openflow-challenge-taking-sdns-to-the-consumer/ 31

OpenFlow - Over the Past Five Years…

Version Date # Headers

OF 1.0 Dec 2009 12

OF 1.1 Feb 2011 15

OF 1.2 Dec 2011 36

OF 1.3 Jun 2012 40

OF 1.4 Oct 2013 41

Proliferation of header fields

• Multiple stages of heterogeneous tables

• Still not enough (e.g., VXLAN, NVGRE, STT, …)32

“Classic” OpenFlow (1.x)

33

Target Switch

SDN Control Plane

Installing and

querying rules

“OpenFlow 2.0”

34

Target Switch

SDN Control Plane

Populating:

Installing and

querying rules

Compiler

Configuring:

Parser, tables,

and control flow

Parser & Table

Configuration

Rule

Translator

Protocol Independent Layer

35

Two Stage: Configuration & Run-Time

36

37~from http://p4.org/

P4 Language’s Three Goals Protocol independence

Configure a packet parser

Define a set of typed match+action tables

Target independence

Program without knowledge of switch details

Rely on compiler to configure the target switch

Reconfigurability

Change parsing and processing in the field

38http://p4.org/

OpenSource SDN Controller Project

39

SDN Controller Landscape

40Pica8

41

42

43

www.opendaylight.org

Project comparisons (ohloh.net)

LoC Contributors

OpenStack 1.67M 1,974

CloudStack 1.5M 250

Eclipse platform 2.67M 404

OpenDaylight 1.05M 154

Floodlight 97K 52

contrail-vrouter

contrail controller

19K

258K15

53

44

(Hydrogen)

SDN - A New Net

45

Making all

Kinds of

Internet

Services

Smarter,

Faster, and

Cheaper “

~ from Nicira

Source from:

http://www.technologyreview.com/featuredstory/426803/a-new-net/ ~Source from InformationWeek

Barriers to SDN

46

Cost. Analysis done (different time, different company) showed commercial offering DOUBLED the per-hour cost of a VM

Security. Need to show very conservative IT organizations that SDN security == VLAN security.

Vendor neutrality. No lock-in.

Vendor support. As things go into production, enterprises need “single throat to choke” support.

Performance. Encap/Decap overhead. Needs to be ZERO、Scalability of flow-match (Limits of T-CAM)

Interoperability. SDN & non-SDN、Inter-Controller

Future SDN Research Works

SDN Debugging

SDN Fault Tolerant

Security

Inter-Domain Routing, e.g.: SDX

Flow revision control

SDN Meet Big-Data

47

Outlines

網路問題&SDN緣起

SDN & Openflow 簡介

NFV with SDN

Reference

Network Functions Virtualization

49

v

Network Functions are SW-based over well-known HW

Multiple roles over same HW

ORCHESTRATED, AUTOMATIC

& REMOTE INSTALL

DPI

BRAS

GGSN/

SGSN

Firewall

CG-NAT

PE Router

VIRTUAL

APPLIANCES

STANDARD HIGH

VOLUME SERVERS

Virtualised Network Model:

VIRTUAL APPLIANCE APPROACHv

Network Functions are based on specific HW&SW

One physical node per role

DPI

BRASGGSN/SGSN

Session Border

ControllerFirewall CG-NAT

PE Router

Traditional Network Model:

APPLIANCE APPROACH

A means to make the network more flexible and simple by minimising dependence on HW constraints

50

NFV vs SDN

from http://www.overturenetworks.com/blog/2013/04/12/network-function-virtualization-and-software-defined-networking-whats-difference

NEC Networking with SDN & NFV

51~Source adapted from NEC

Traditional Networking SDN (Openflow) Networking SDN +NFV Networking

NFV DistributedService Cloud

ETSI NFV Architecture

52

OPNFV

About OPNFV

5353

SDN+NFV Example : vCPE

54

55

NFV Services Chaining

56

NFV Summary

57

NFV provides virtualization, orchestration, scaling,

automation, hardware independence etc..

NFV and SDN are complementary and independent

frameworks.

NFV doesn’t mandate control plane and Data plane

separation and hence OpenFlow is not mandated in NFV.

Lot of Network function has been demonstrated by carriers

already.

Keys to Networking Evolution Trend Open Innovation

Creates competitive supply of innovative applications by

3rd Parties

NFV: re-definition of Network Equipment

Architecture

SDN: re-definition of Network Architecture

Open

Innovation

Network

Functions

Virtualization

• SDN treats the network’s control plane as a

programmable function,

• NFV Treats the network’s data plane as a

programmable function~From: Dr. Larry Peterson

~Source: Adapted from Cesar Marcondes, SBRC/2014 Software

Defined

Networking

58

SDN & NFV Hype Cycle

59

企業SDN 全球市場預估

60

Ref: http://www.ithome.com.tw/article/93828

SDN&NFV 2015~2020 全球市場預估

61

SDN&NFV Networking Spend By Use Case Categories

• SDxCentral預估2020年全世界網路通訊設備市場將超過1仟3百億美元，其中SDN與NFV市場總產值約佔其80%，將從2015年預估180億成長到2020年超過1

仟億美元。

* Source from: 2015 SDxCentral SDN and NFV Market Size Report (2015/05)

Reference Open Networking Foundation (ONF) https://www.opennetworking.org/

OpenDaylight https://wiki.opendaylight.org

Mininet http://mininet.org/

Open vSwitch http://openvswitch.org/

Early OpenFlow paper (2008): http://archive.openflow.org/documents/openflow-wp-latest.pdf

SDN white paper (2012): https://www.opennetworking.org/images/stories/downloads/sdn-resources/white-

papers/wp-sdn-newnorm.pdf

OFELIA presentation http://www.fp7-ofelia.eu/assets/Publications-and-Presentations/SDN-The-Next-Wave-

of-Networking.pdf

Coursera https://www.coursera.org/course/sdn

Google http://googlecloudplatform.blogspot.co.uk/2014/04/enter-andromeda-zone-google-cloud-platforms-

latest-networking-stack.html

B. Martinussen (Cisco), “Introduction to Software Defined Networks (SDN),” April 2013,

http://www.cisco.com/web/europe/ciscoconnect2013/pdf/DC_3_SDN.pdf

ETSI, “NFV - Update White Paper,” Oct 2013, http://portal.etsi.org/NFV/NFV_White_Paper2.pdf

62

http://www.slideshare.net/rkeahey/softwaredefined-networking-14760819?related=1 63

SDN Learning Network

(UC Berkeley)

Backup

64

OpenSource Project for SDN/NFV

65~from ONF

CHT 採購需求 OpenFlow Switch

Number of flow entries

openFlow 1.3 or above

OpenFlow conformance Test

OpenFlow Controller

open Northbound API

OpenFlow 1.3 or above

Reliability and survivability

OF 1.4 : Oct 14, 2013OF 1.5 : Dec, 2014

66

• Very intensive

in hardware

• Software not at

the core

• Very intensive

in software

• Hardware is a

necessary base

x

HARDWARE SOFTWARE+

-

+

-

Traditional telcos Internet players

Enter the Software-Defined Era

Google, Facebook…AT&T, Telefonica…

67Source: Adapted from D. Lopez Telefonica I+D, NFV

SDN Uses Cases

Cloud Computing Data Center

Intra-Data Center, Inter-Data Center

Broadband Network Services

Smart Network

Network Virtualization

Virtualization of the CPE functions

Enterprise Network

Campus Network

Wireless & Mobile Network

Traffic Strings/Steering

Content Delivery Traffic routing

Security on Demand

Network as a service

SDNcentral.com 2013

68

Data Center Network Architectures專用網路，專用網路設備，專用伺服器

專用網路，專用網路設備，共用伺服器

共用網路，共用網路設備，共用伺服器

Network virtualization Network Function virtualization

69

Open SDN Controller

70

71

72

73

www.opendaylight.org

OpenDaylight (Hydrogen) code volume (ohloh.net)

74