Introduction to software defined networks (sdn)

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This document provides an introduction to Software Defined Networks (SDN). It discusses: 1) The drawbacks of existing networks that led to the development of SDN, including difficulty performing experiments, slow innovation, and closed/proprietary systems. 2) The key aspects of the SDN architecture, including separating the control plane and data plane, running the control plane on general purpose hardware, and having programmable data planes. 3) The main components of SDN including the controller, which provides network-wide control and management via northbound APIs, and OpenFlow switches, which can be dynamically reconfigured through OpenFlow rules installed by the controller.

Technology

PART 1:
BACKGROUND
8/30/2019 By Eng. Ghandy Hessam 2

Introduction
• Drawbacks of existing network:
➢Difficult to perform real world experiments on large scale
production networks.
➢Networks have remained the same for many years.
➢Rate of innovation in networks is slower.
➢Closed Systems: Vendor specific software.
➢Non-standard interfaces to H/W.
➢Traditional networks are known to be “inside the box” paradigm.
• Thus, proposals for a new networking paradigm, namely
programmable networks
8/30/2019 By Eng. Ghandy Hessam 3

Software Defined Networking
• Separate Control plane and Data plane entities.
• Execute or run Control plane software on general purpose
hardware.
• Have programmable data planes.
• An architecture to control not just a networking device but an
entire network.
8/30/2019 By Eng. Ghandy Hessam 4

SDN Architecture
8/30/2019 By Eng. Ghandy Hessam 5

SDN Components: Controller
8/30/2019 By Eng. Ghandy Hessam 6

Existing SDN Controller Implementations
 Java-based versions:
 Python-based versions:
8/30/2019 By Eng. Ghandy Hessam 7

Controller northbound API
 Data Plane managed via
Network Controller
providing high level
services like:
– Firewall
– Load Balancing
– VPN
– Intrusion Detection
– …
8/30/2019 By Eng. Ghandy Hessam 8

SDN Components: OpenFlow Switch
 Plug-in services at the switch
layer
 Filtering traffic based on open
flow rules
 Create a underlay network
 Dynamically reconfigure
network based Events
 The widely known one is:
8/30/2019 By Eng. Ghandy Hessam 9

OpenFlow Protocol
 OpenFlow Basics:
❖ Ports and Port Queues
❖ Flow Table
❖ Packet Matching
❖ Actions and Packet
Forwarding
❖ Messaging Between
Controller and Switch
8/30/2019 By Eng. Ghandy Hessam 10

OF v1.0: Flow Table Entry
8/30/2019 By Eng. Ghandy Hessam 11

OF v1.3: Flow Table Entry
8/30/2019 By Eng. Ghandy Hessam 12

Basic Packet matching function
8/30/2019 By Eng. Ghandy Hessam 13

OpenFlow: Types of Messages (1)
• Asynchronous (Controller-to-Switch)
• Send-packet
• Flow-mod
• Asynchronous (initiated by the switch)
• Read-state
• Features
• Configuration
8/30/2019 By Eng. Ghandy Hessam 14

OpenFlow: Types of Messages (2)
• Asynchronous (initiated by the switch)
• Packet-in
• Flow-removed
• Port-status
• Error
• Symmetric (can be sent in either direction without solicitation)
• Hello
• Echo
• Vendor
8/30/2019 By Eng. Ghandy Hessam 15

Dimension of SDN Applications:
Rule installation
Proactive Rules Reactive Rules
Controller (N. O.S.)
Applications
Applications
Applications
Switch H.W
O.S
Controller (N. O.S.)
Applications
Applications
Applications
Switch H.W
O.S
8/30/2019 By Eng. Ghandy Hessam 16

Dimensions of SDN Applications:
Granularity of Rules (1)
Microflow WildCards (aggregated rules)
Controller (N. O.S.)
Applications
Applications
Applications
Switch H.W
O.S
Controller (N. O.S.)
Applications
Applications
Applications
Switch H.W
O.S
8/30/2019 By Eng. Ghandy Hessam 17

Dimensions of SDN Applications:
Granularity of Rules (2)
Distributed Controller Centralized Controller
Controller (N. O.S.)
Applications
Applications
Applications
Switch O.S
Switch HW
Switch O.S
Switch HW
Switch O.S
Switch HW
Controller (N. O.S.)
Applications
Applications
Applications
Switch O.S
Switch HW
Switch O.S
Switch HW
Switch O.S
Switch HW
Controller (N. O.S.)
Applications
Applications
Applications
Controller (N. O.S.)
Applications
Applications
Applications
8/30/2019 By Eng. Ghandy Hessam 18

Google’ B4 Application
 Rule installation
 Proactive
 Rule Granularity
 Aggregate
 Distributed
 Multiple instances
8/30/2019 By Eng. Ghandy Hessam 19

End of Session 5
By Eng. Ghandy Hessam
8/30/2019 20

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Introduction to software defined networks (sdn)

1. Damascus University Faculty of Information Technology Engineering Department of Computer Systems and Networks ‫دمشق‬ ‫جامعة‬ ‫المعلوماتية‬ ‫الهندسة‬ ‫كلية‬ ‫الحاسوب‬ ‫والشبكات‬ ‫النظم‬ ‫قسم‬ ‫ة‬ّ‫ي‬ ‫الشبكات‬ ‫ة‬ ‫إدار‬ ‫عملي‬ Network Management Session 5: Introduction to Software Defined Networks (SDN) ‫اعداد‬ : ‫م‬ . ‫غاندي‬ ‫هسام‬ Ghandi Hessam

2. PART 1: BACKGROUND 8/30/2019 By Eng. Ghandy Hessam 2

3. Introduction • Drawbacks of existing network: ➢Difficult to perform real world experiments on large scale production networks. ➢Networks have remained the same for many years. ➢Rate of innovation in networks is slower. ➢Closed Systems: Vendor specific software. ➢Non-standard interfaces to H/W. ➢Traditional networks are known to be “inside the box” paradigm. • Thus, proposals for a new networking paradigm, namely programmable networks 8/30/2019 By Eng. Ghandy Hessam 3

4. Software Defined Networking • Separate Control plane and Data plane entities. • Execute or run Control plane software on general purpose hardware. • Have programmable data planes. • An architecture to control not just a networking device but an entire network. 8/30/2019 By Eng. Ghandy Hessam 4

5. SDN Architecture 8/30/2019 By Eng. Ghandy Hessam 5

6. SDN Components: Controller 8/30/2019 By Eng. Ghandy Hessam 6

7. Existing SDN Controller Implementations  Java-based versions:  Python-based versions: 8/30/2019 By Eng. Ghandy Hessam 7

8. Controller northbound API  Data Plane managed via Network Controller providing high level services like: – Firewall – Load Balancing – VPN – Intrusion Detection – … 8/30/2019 By Eng. Ghandy Hessam 8

9. SDN Components: OpenFlow Switch  Plug-in services at the switch layer  Filtering traffic based on open flow rules  Create a underlay network  Dynamically reconfigure network based Events  The widely known one is: 8/30/2019 By Eng. Ghandy Hessam 9

10. OpenFlow Protocol  OpenFlow Basics: ❖ Ports and Port Queues ❖ Flow Table ❖ Packet Matching ❖ Actions and Packet Forwarding ❖ Messaging Between Controller and Switch 8/30/2019 By Eng. Ghandy Hessam 10

11. OF v1.0: Flow Table Entry 8/30/2019 By Eng. Ghandy Hessam 11

12. OF v1.3: Flow Table Entry 8/30/2019 By Eng. Ghandy Hessam 12

13. Basic Packet matching function 8/30/2019 By Eng. Ghandy Hessam 13

14. OpenFlow: Types of Messages (1) • Asynchronous (Controller-to-Switch) • Send-packet • Flow-mod • Asynchronous (initiated by the switch) • Read-state • Features • Configuration 8/30/2019 By Eng. Ghandy Hessam 14

15. OpenFlow: Types of Messages (2) • Asynchronous (initiated by the switch) • Packet-in • Flow-removed • Port-status • Error • Symmetric (can be sent in either direction without solicitation) • Hello • Echo • Vendor 8/30/2019 By Eng. Ghandy Hessam 15

16. Dimension of SDN Applications: Rule installation Proactive Rules Reactive Rules Controller (N. O.S.) Applications Applications Applications Switch H.W O.S Controller (N. O.S.) Applications Applications Applications Switch H.W O.S 8/30/2019 By Eng. Ghandy Hessam 16

17. Dimensions of SDN Applications: Granularity of Rules (1) Microflow WildCards (aggregated rules) Controller (N. O.S.) Applications Applications Applications Switch H.W O.S Controller (N. O.S.) Applications Applications Applications Switch H.W O.S 8/30/2019 By Eng. Ghandy Hessam 17

18. Dimensions of SDN Applications: Granularity of Rules (2) Distributed Controller Centralized Controller Controller (N. O.S.) Applications Applications Applications Switch O.S Switch HW Switch O.S Switch HW Switch O.S Switch HW Controller (N. O.S.) Applications Applications Applications Switch O.S Switch HW Switch O.S Switch HW Switch O.S Switch HW Controller (N. O.S.) Applications Applications Applications Controller (N. O.S.) Applications Applications Applications 8/30/2019 By Eng. Ghandy Hessam 18

19. Google’ B4 Application  Rule installation  Proactive  Rule Granularity  Aggregate  Distributed  Multiple instances 8/30/2019 By Eng. Ghandy Hessam 19

20. End of Session 5 By Eng. Ghandy Hessam 8/30/2019 20

Introduction to software defined networks (sdn)

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