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SDN 테스트베드 구축
라즈베리파이를 이용하여 이더넷 스위치를 제작,
ON.Lab의 ONOS/OVX SDN 컨트롤러로 제어
Programmable Network 구축
한국정보과학회 단기강좌
경희대학교 이성원 교수
Ema...
Mobile Convergence Laboratory 2
목차
A Table of Contents
ONOS
ONOS(Open Network Operating System) 소개, 아키텍처 분석, 설치 및 데모
Keywo...
ONOS
SDN Network Operating System & SDN Control Platform
Mobile Convergence Laboratory 3
Mobile Convergence Laboratory 4
• Service Provider를 위한 캐리어급 SDN 네트워크 운영체제
• 이 주도한 프로젝트
Mobile Convergence Laboratory 5
• Service Provider를 위한 캐리어급 SDN 네트워크 운영체제
• 이 주도한 프로젝트
Mobile Convergence Laboratory 6
Mobile Convergence Laboratory 7
Non-profit
Tools/Platforms for SDN community
Mobile Convergence Laboratory 8
Mobile Convergence Laboratory 9
Mobile Convergence Laboratory 10
Mobile Convergence Laboratory 11
Mobile Convergence Laboratory 12
Supporting members
Mobile Convergence Laboratory 13
Projects
• Service Provider를 위한 캐리어급 SDN 네트워크 운영체제
• 이 주도한 프로젝트
Mobile Convergence Laboratory 14
15Mobile Convergence Laboratory
ONOS의 목표는
뭘까?
기존의 수많은
SDN controller
Mobile Convergence Laboratory 16
Mobile Convergence Laboratory 17
commercial
products
Mobile Convergence Laboratory 18
commercial
products
Mobile Convergence Laboratory 19
commercial
products
Mobile Convergence Laboratory 20
High Availability
• Multiple Instance Clustering
• Fault tolerance using Distributed Core...
Mobile Convergence Laboratory 21
High Availability High Performance
• High Throughput
• ~500K-1M path setups/second
• High...
Mobile Convergence Laboratory 22
High Availability High Performance Scalability
• OSGi 기반의 오픈소스 Karaf
 쉽고 빠른 배포
• 분산 클러스터...
Mobile Convergence Laboratory 23
High Availability High Performance Scalability White Box (Open)
Reference : ONOS wiki
Mobile Convergence Laboratory 24
High Availability High Performance Scalability White Box (Open)
Mobile Convergence Laboratory 25
ONOS Framework(ONOSFW)
Mobile Convergence Laboratory 26
ONOS as an SDN
controller within the
VIM
Mobile Convergence Laboratory 27
ONOS Architecture
Mobile Convergence Laboratory 28
Mobile Convergence Laboratory 29
구체적인 서비스를
위한 Application 계층
Mobile Convergence Laboratory 30
Application 계층에
네트워크 정보 전달,
하위 컴포넌트 제어를
위한 인터페이스 제공
Mobile Convergence Laboratory 31
ONOS의 핵심적인 역할
을 하며,
HA와 Scalability를 위한
분산 클러스터링 기능
Mobile Convergence Laboratory 32
네트워크 인프라 제어를
위한 인터페이스 제공
Network Element 추상화
Mobile Convergence Laboratory 33
Network Element 설정
을 위한 프로토콜
OpenFlow : SDN
NetConf : Legacy
Mobile Convergence Laboratory 34
Distributed
Core
Instance 1
Scale-out by Distributed Core (1)
Network Graph
Global networ...
Mobile Convergence Laboratory 35
Distributed
Core
Instance 1 Instance 2 Instance 3
Scale-out by Distributed Core (2)
Netwo...
Mobile Convergence Laboratory 36
Distributed
Core
Instance 1 Instance 2 Instance 3
Network Graph
Global network view
HA by...
Mobile Convergence Laboratory 37
Distributed
Core
Instance 1 Instance 2 Instance 3
Network Graph
Global network view
HA by...
Mobile Convergence Laboratory 38
Distributed
Core
Instance 1 Instance 2 Instance 3
Network Graph
Global network view
HA by...
Mobile Convergence Laboratory 39
Clustering Synchronize Data
Sharing
ONOS - Install
1. Getting ONOS
2. Installing ONOS
3. Start ONOS
Mobile Convergence Laboratory 40
Prerequisites
• Ubuntu 14.04 LTS 64bits
• 2GB or more RAM
• 2 or more processors
• 8GB or more storage
• Java 8 JDK
• Apac...
1. Install Java 8
$ sudo apt-get install software-properties-common -y
$ sudo add-apt-repository ppa:webupd8team/java -y
$...
1.1. Configure Java Path
• on Ubuntu
$ env | grep JAVA_HOME
JAVA_HOME=/usr/lib/jvm/java-8-oracle
$ export JAVA_HOME=/usr/l...
2. Install Git
$ sudo apt-get install git-core
$ git --version
Mobile Convergence Laboratory 44
3. Set Maven
$ cd; mkdir Downloads Applications
$ cd Downloads
$ wget http://archive.apache.org/dist/maven/maven-
3/3.3.1/...
4. Set Karaf
$ cd Downloads
$ wget http://download.nextag.com/apache/karaf/3.0.3/apache-
karaf-3.0.3.tar.gz
$ tar -zxvf ap...
5. Clone ONOS
$ git clone https://gerrit.onosproject.org/onos/
$ cd onos
if> getting specific ONOS version
$ git checkout ...
5.1. Configure ONOS Path
$ export ONOS_ROOT=~/onos
$ source $ONOS_ROOT/tools/dev/bash_profile
Mobile Convergence Laborator...
6. Build ONOS
$ cd ~/onos
$ mvn clean install
Mobile Convergence Laboratory 49
빌드 성공
7. Start ONOS CLI
$ karaf clean
Mobile Convergence Laboratory 50
8. Start ONOS GUI
• start ONOS (ONOS CLI)
• In web browser
• http://localhost:8181/onos/ui/index.html
Mobile Convergence L...
Mobile Convergence Laboratory 52
<Network Graph>
토폴로지 GUI와 Host 정보
<Node Info>
해당 노드(스위치)의 정보
Protocol / Ports / Flow
버전 및...
Mobile Convergence Laboratory 53
<ONOS Instance>
OpenVirteX
Network Virtualization Platform & Network Hypervisor
Mobile Convergence Laboratory 54
OpenVirteX (OVX)
• Network Virtualization Platform
• Network Hypervisor
Mobile Convergence Laboratory 55
Mobile Convergence Laboratory 56
주요 기능
• Topology Virtualization
• Address Space Virtualization
• Control Function Virtualization
Mobile Convergence Labora...
주요 기능 - Topology Virtualization
• 가상화를 통해 물리적 네트워크를 분리
• 물리 계층을 추상화
• 다수의 스위치를 묶어서 하나의 스위치로 가상화(Big Switch)
Mobile Converg...
주요 기능 - Address Space Virtualization
Mobile Convergence Laboratory 59
주요 기능 - Control Function Virtualization
Mobile Convergence Laboratory 60
SDN Controller
(NOS)
Big Switch
Controll Plane
(b...
OpenVirteX - Install
Mobile Convergence Laboratory 61
Prerequisites
Recommended
• 4 Cores
• 4GB Java heap size
Minimum
• 2 Cores
• 1GB Java heap size
Mobile Convergence Laborat...
1. Install Git & Maven
$ apt-get install git-core
$ apt-get install maven
Mobile Convergence Laboratory 63
2. Install Java7
$ sudo apt-get install software-properties-common -y
$ sudo add-apt-repository ppa:webupd8team/java -y
$ ...
3. Clone OpenVirteX
$ git clone https://github.com/OPENNETWORKINGLAB/OpenVirteX.git -b 0.0-MAINT
$ cd ~/OpenVirteX/scripts...
4. Start OVX
$ sh ovx.sh
ex> 가상 네트워크 생성 및 Big Switch 생성
$ python ovxctl.py -n createNetwork tcp:localhost:30000 10.0.0.0 1...
Pi Stack Switch
Raspberry Pi를 이용한 SDN 테스트베드 개발
Mobile Convergence Laboratory 67
Raspberry Pi
• 영국의 라즈베리파이 재단이 만든 교육용 싱글 보드 컴퓨터
• Single Board Computer
• 대략 US$ 35
• Pi A/B, Pi B+, Pi2 출시
Mobile Converge...
Raspberry Pi2의 스펙
• Single Board Computer(Micro Computer)
• CPU : 900MHz ARM Cortex-A7 쿼드코어
• RAM : 1GB
• USB 2.0 * 4 + HD...
Pi Stack Switch HW구성
Mobile Convergence Laboratory 70
Mobile Convergence Laboratory 71
Pi Stack Switch HW구성
메인 스위치 x 1개 x 1포트
+
서브 스위치 x 3개 x 3포트
= 10포트 스위치
Mobile Convergence Laboratory 72
Pi Stack Switch 완성
Mobile Convergence Laboratory 73
USB허브를 이용한 17포트 스위치
Mobile Convergence Laboratory 74
Raspbian OS
Software
Mobile Convergence Laboratory 75
Software
Mobile Convergence Laboratory 76
System
Architecture
USBtoEthernet
Bridge
eth1 eth2 eth3
eth0
Ethernet
Port
USBtoEthernet
...
Pi Stack Switch - Install
• OpenvSwitch 설치
$ sudo apt-get install openvswitch-switch openvswitch-
controller openvswitch-c...
Pi Stack Switch와 ONOS 연결
Mobile Convergence Laboratory 78
메인 스위치
서브 스위치1
서브 스위치2
서브 스위치3
SDN Network 구축
SDN 테스트베드와 하이퍼바이저 그리고 SDN 컨트롤러
Mobile Convergence Laboratory 79
Mobile Convergence Laboratory 80
Pi Stack Switch
Mobile Convergence Laboratory 81
Network
Architecture
Network
Operating
System
Virtual Network
Physical Layer
OpenFlow Int...
Mobile Convergence Laboratory 82
Network Element Mapping
Mobile Convergence Laboratory 83
Big Switch
Network Element Mapping
Reference
• ONOS
• http://onosproject.org/
• https://wiki.onosproject.org/ 공식 Wiki
• https://wiki.onosproject.org/display/...
Q&A
Mobile Convergence Laboratory 85
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Implementing SDN Testbed(ONOS & OpenVirteX)

SDN 테스트베드 구축
Build SDN testbed using Raspberry Pi
- SDN controller : ONOS
- Network Hypervisor : OpenVirteX
- OpenFlow Switch : Raspberry Pi2

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Implementing SDN Testbed(ONOS & OpenVirteX)

  1. 1. SDN 테스트베드 구축 라즈베리파이를 이용하여 이더넷 스위치를 제작, ON.Lab의 ONOS/OVX SDN 컨트롤러로 제어 Programmable Network 구축 한국정보과학회 단기강좌 경희대학교 이성원 교수 Email : drsungwon@khu.ac.kr Web : http://mobilelab.khu.ac.kr 경희대학교 컴퓨터공학과 모바일컨버전스Lab 한상윤 Email : sangyun0628@khu.ac.kr
  2. 2. Mobile Convergence Laboratory 2 목차 A Table of Contents ONOS ONOS(Open Network Operating System) 소개, 아키텍처 분석, 설치 및 데모 Keyword : Distributed core, Hazelcast, Intent Framework, maven, karaf OpenVirteX OVX 소개, Network Hypervisor와 가상화 플랫폼의 기능, 설치 및 데모 Keyword : Hypervisor, 네트워크 가상화 플랫폼, Resilient, elastic Pi Stack Switch Raspberry Pi와 Open vSwitch를 이용한 SDN 테스트베드 구축 Keyword : Raspberry Pi, Open vSwitch, OpenFlow 스위치 Q&A 질의응답 Pi Stack Switch
  3. 3. ONOS SDN Network Operating System & SDN Control Platform Mobile Convergence Laboratory 3
  4. 4. Mobile Convergence Laboratory 4
  5. 5. • Service Provider를 위한 캐리어급 SDN 네트워크 운영체제 • 이 주도한 프로젝트 Mobile Convergence Laboratory 5
  6. 6. • Service Provider를 위한 캐리어급 SDN 네트워크 운영체제 • 이 주도한 프로젝트 Mobile Convergence Laboratory 6
  7. 7. Mobile Convergence Laboratory 7 Non-profit Tools/Platforms for SDN community
  8. 8. Mobile Convergence Laboratory 8
  9. 9. Mobile Convergence Laboratory 9
  10. 10. Mobile Convergence Laboratory 10
  11. 11. Mobile Convergence Laboratory 11
  12. 12. Mobile Convergence Laboratory 12 Supporting members
  13. 13. Mobile Convergence Laboratory 13 Projects
  14. 14. • Service Provider를 위한 캐리어급 SDN 네트워크 운영체제 • 이 주도한 프로젝트 Mobile Convergence Laboratory 14
  15. 15. 15Mobile Convergence Laboratory ONOS의 목표는 뭘까? 기존의 수많은 SDN controller
  16. 16. Mobile Convergence Laboratory 16
  17. 17. Mobile Convergence Laboratory 17 commercial products
  18. 18. Mobile Convergence Laboratory 18 commercial products
  19. 19. Mobile Convergence Laboratory 19 commercial products
  20. 20. Mobile Convergence Laboratory 20 High Availability • Multiple Instance Clustering • Fault tolerance using Distributed Core • Five Nines 수준의 가용성
  21. 21. Mobile Convergence Laboratory 21 High Availability High Performance • High Throughput • ~500K-1M path setups/second • High Volume • ~500GB-1TB state data • Low Latency • 10~100ms
  22. 22. Mobile Convergence Laboratory 22 High Availability High Performance Scalability • OSGi 기반의 오픈소스 Karaf  쉽고 빠른 배포 • 분산 클러스터링 지원  Sync, Share
  23. 23. Mobile Convergence Laboratory 23 High Availability High Performance Scalability White Box (Open) Reference : ONOS wiki
  24. 24. Mobile Convergence Laboratory 24 High Availability High Performance Scalability White Box (Open)
  25. 25. Mobile Convergence Laboratory 25 ONOS Framework(ONOSFW)
  26. 26. Mobile Convergence Laboratory 26 ONOS as an SDN controller within the VIM
  27. 27. Mobile Convergence Laboratory 27
  28. 28. ONOS Architecture Mobile Convergence Laboratory 28
  29. 29. Mobile Convergence Laboratory 29 구체적인 서비스를 위한 Application 계층
  30. 30. Mobile Convergence Laboratory 30 Application 계층에 네트워크 정보 전달, 하위 컴포넌트 제어를 위한 인터페이스 제공
  31. 31. Mobile Convergence Laboratory 31 ONOS의 핵심적인 역할 을 하며, HA와 Scalability를 위한 분산 클러스터링 기능
  32. 32. Mobile Convergence Laboratory 32 네트워크 인프라 제어를 위한 인터페이스 제공 Network Element 추상화
  33. 33. Mobile Convergence Laboratory 33 Network Element 설정 을 위한 프로토콜 OpenFlow : SDN NetConf : Legacy
  34. 34. Mobile Convergence Laboratory 34 Distributed Core Instance 1 Scale-out by Distributed Core (1) Network Graph Global network view
  35. 35. Mobile Convergence Laboratory 35 Distributed Core Instance 1 Instance 2 Instance 3 Scale-out by Distributed Core (2) Network Graph Global network view
  36. 36. Mobile Convergence Laboratory 36 Distributed Core Instance 1 Instance 2 Instance 3 Network Graph Global network view HA by Distributed Core (1)
  37. 37. Mobile Convergence Laboratory 37 Distributed Core Instance 1 Instance 2 Instance 3 Network Graph Global network view HA by Distributed Core (2)
  38. 38. Mobile Convergence Laboratory 38 Distributed Core Instance 1 Instance 2 Instance 3 Network Graph Global network view HA by Distributed Core (3)
  39. 39. Mobile Convergence Laboratory 39 Clustering Synchronize Data Sharing
  40. 40. ONOS - Install 1. Getting ONOS 2. Installing ONOS 3. Start ONOS Mobile Convergence Laboratory 40
  41. 41. Prerequisites • Ubuntu 14.04 LTS 64bits • 2GB or more RAM • 2 or more processors • 8GB or more storage • Java 8 JDK • Apache Maven(3.0 and later) • Apache Karaf(3.0.2 and later) • Git Mobile Convergence Laboratory 41
  42. 42. 1. Install Java 8 $ sudo apt-get install software-properties-common -y $ sudo add-apt-repository ppa:webupd8team/java -y $ sudo apt-get update $ sudo apt-get install oracle-java8-installer oracle-java8-set-default Mobile Convergence Laboratory 42
  43. 43. 1.1. Configure Java Path • on Ubuntu $ env | grep JAVA_HOME JAVA_HOME=/usr/lib/jvm/java-8-oracle $ export JAVA_HOME=/usr/lib/jvm/java-8-oracle Mobile Convergence Laboratory 43
  44. 44. 2. Install Git $ sudo apt-get install git-core $ git --version Mobile Convergence Laboratory 44
  45. 45. 3. Set Maven $ cd; mkdir Downloads Applications $ cd Downloads $ wget http://archive.apache.org/dist/maven/maven- 3/3.3.1/binaries/apache-maven-3.3.1-bin.tar.gz $ tar -zxvf apache-maven-3.3.1-bin.tar.gz -C ../Applications/ Mobile Convergence Laboratory 45
  46. 46. 4. Set Karaf $ cd Downloads $ wget http://download.nextag.com/apache/karaf/3.0.3/apache- karaf-3.0.3.tar.gz $ tar -zxvf apache-karaf-3.0.3.tar.gz -C ../Applications/ Mobile Convergence Laboratory 46
  47. 47. 5. Clone ONOS $ git clone https://gerrit.onosproject.org/onos/ $ cd onos if> getting specific ONOS version $ git checkout <ver> Mobile Convergence Laboratory 47
  48. 48. 5.1. Configure ONOS Path $ export ONOS_ROOT=~/onos $ source $ONOS_ROOT/tools/dev/bash_profile Mobile Convergence Laboratory 48
  49. 49. 6. Build ONOS $ cd ~/onos $ mvn clean install Mobile Convergence Laboratory 49 빌드 성공
  50. 50. 7. Start ONOS CLI $ karaf clean Mobile Convergence Laboratory 50
  51. 51. 8. Start ONOS GUI • start ONOS (ONOS CLI) • In web browser • http://localhost:8181/onos/ui/index.html Mobile Convergence Laboratory 51
  52. 52. Mobile Convergence Laboratory 52 <Network Graph> 토폴로지 GUI와 Host 정보 <Node Info> 해당 노드(스위치)의 정보 Protocol / Ports / Flow 버전 및 지리적 정보 <ONOS Summary> Network Element의 수 링크의 수 호스트의 수 Flow의 수…
  53. 53. Mobile Convergence Laboratory 53 <ONOS Instance>
  54. 54. OpenVirteX Network Virtualization Platform & Network Hypervisor Mobile Convergence Laboratory 54
  55. 55. OpenVirteX (OVX) • Network Virtualization Platform • Network Hypervisor Mobile Convergence Laboratory 55
  56. 56. Mobile Convergence Laboratory 56
  57. 57. 주요 기능 • Topology Virtualization • Address Space Virtualization • Control Function Virtualization Mobile Convergence Laboratory 57
  58. 58. 주요 기능 - Topology Virtualization • 가상화를 통해 물리적 네트워크를 분리 • 물리 계층을 추상화 • 다수의 스위치를 묶어서 하나의 스위치로 가상화(Big Switch) Mobile Convergence Laboratory 58
  59. 59. 주요 기능 - Address Space Virtualization Mobile Convergence Laboratory 59
  60. 60. 주요 기능 - Control Function Virtualization Mobile Convergence Laboratory 60 SDN Controller (NOS) Big Switch Controll Plane (by OpenFlow Channel) OVX
  61. 61. OpenVirteX - Install Mobile Convergence Laboratory 61
  62. 62. Prerequisites Recommended • 4 Cores • 4GB Java heap size Minimum • 2 Cores • 1GB Java heap size Mobile Convergence Laboratory 62 • Git • Oracle Java7 (Not OpenJDK, Not Java8) • Maven • Python 2.7.x
  63. 63. 1. Install Git & Maven $ apt-get install git-core $ apt-get install maven Mobile Convergence Laboratory 63
  64. 64. 2. Install Java7 $ sudo apt-get install software-properties-common -y $ sudo add-apt-repository ppa:webupd8team/java -y $ sudo apt-get update $ sudo apt-get install oracle-java7-installer Mobile Convergence Laboratory 64
  65. 65. 3. Clone OpenVirteX $ git clone https://github.com/OPENNETWORKINGLAB/OpenVirteX.git -b 0.0-MAINT $ cd ~/OpenVirteX/scripts. Mobile Convergence Laboratory 65
  66. 66. 4. Start OVX $ sh ovx.sh ex> 가상 네트워크 생성 및 Big Switch 생성 $ python ovxctl.py -n createNetwork tcp:localhost:30000 10.0.0.0 16 $ python ovxctl.py -n createSwitch DPID_1,DPID_2,DPID_3,DPID_4 <Tutorial & API Doc> http://ovx.onlab.us/getting-started/tutorial/ http://ovx.onlab.us/documentation/api/ Mobile Convergence Laboratory 66
  67. 67. Pi Stack Switch Raspberry Pi를 이용한 SDN 테스트베드 개발 Mobile Convergence Laboratory 67
  68. 68. Raspberry Pi • 영국의 라즈베리파이 재단이 만든 교육용 싱글 보드 컴퓨터 • Single Board Computer • 대략 US$ 35 • Pi A/B, Pi B+, Pi2 출시 Mobile Convergence Laboratory 68
  69. 69. Raspberry Pi2의 스펙 • Single Board Computer(Micro Computer) • CPU : 900MHz ARM Cortex-A7 쿼드코어 • RAM : 1GB • USB 2.0 * 4 + HDMI * 1 + Micro USB전원 • 10/100 Mbit/s Ethernet Mobile Convergence Laboratory 69출처 : Wikipedia(wikipedia.org/wiki/Raspberry_Pi)
  70. 70. Pi Stack Switch HW구성 Mobile Convergence Laboratory 70
  71. 71. Mobile Convergence Laboratory 71 Pi Stack Switch HW구성 메인 스위치 x 1개 x 1포트 + 서브 스위치 x 3개 x 3포트 = 10포트 스위치
  72. 72. Mobile Convergence Laboratory 72 Pi Stack Switch 완성
  73. 73. Mobile Convergence Laboratory 73 USB허브를 이용한 17포트 스위치
  74. 74. Mobile Convergence Laboratory 74 Raspbian OS Software
  75. 75. Mobile Convergence Laboratory 75 Software
  76. 76. Mobile Convergence Laboratory 76 System Architecture USBtoEthernet Bridge eth1 eth2 eth3 eth0 Ethernet Port USBtoEthernet USBtoEthernet FlowTable
  77. 77. Pi Stack Switch - Install • OpenvSwitch 설치 $ sudo apt-get install openvswitch-switch openvswitch- controller openvswitch-common $ sudo ovs-vsctl add-br <BridgeName> $ sudo ovs-vsctl add-port <BridgeName> eth_n $ sudo ovs-vsctl set-controller <BridgeName> tcp:Ctrl_IP:6633 https://github.com/MobileConvergenceLab/pi-switch Mobile Convergence Laboratory 77
  78. 78. Pi Stack Switch와 ONOS 연결 Mobile Convergence Laboratory 78 메인 스위치 서브 스위치1 서브 스위치2 서브 스위치3
  79. 79. SDN Network 구축 SDN 테스트베드와 하이퍼바이저 그리고 SDN 컨트롤러 Mobile Convergence Laboratory 79
  80. 80. Mobile Convergence Laboratory 80 Pi Stack Switch
  81. 81. Mobile Convergence Laboratory 81 Network Architecture Network Operating System Virtual Network Physical Layer OpenFlow Interface Pi Stack Switch OpenFlow Interface Big Switch
  82. 82. Mobile Convergence Laboratory 82 Network Element Mapping
  83. 83. Mobile Convergence Laboratory 83 Big Switch Network Element Mapping
  84. 84. Reference • ONOS • http://onosproject.org/ • https://wiki.onosproject.org/ 공식 Wiki • https://wiki.onosproject.org/display/ONOS/ONOS+from+Scratch • https://wiki.onosproject.org/display/ONOS/Installing+and+Running+ONOS • https://www.youtube.com/watch?v=dWhtswhSpWE • Pankaj Berde and others, “ONOS: Towards an Open, Distributed SDN OS”, HostSDN 2014 • OpenVirteX • http://ovx.onlab.us/ • Ali Al-Shabibi and others, “OpenVirteX: Make Your Virtual SDNs Programmable”, HotSDN 2014 • OpenvSwitch • http://www.openvswitch.org/ • Raspberry Pi • https://www.raspberrypi.org/ • http://en.wikipedia.org/wiki/Raspberry_Pi Mobile Convergence Laboratory 84
  85. 85. Q&A Mobile Convergence Laboratory 85

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