1. NOX: Towards an Operating System for Networks Author: Natasha Gude, TeemuKoponen, Justin Pettit, Ben Pfaff, Martín Casado, Nick McKeownand Scott Shenker Publisher: SIGCOMM Computer Communication Review, 2008 Presenter: Yu Hao, Tseng Date: 2013/05/15

2. Outline • Introduction • NOX Overview • Programmatic Interface • Example Application

3. Introduction • What we clearly need is an operating system for networks, one that would provide a uniform and centralized programmatic interface to the entire network. • A network operating system would not manage the network itself; it would merely provide a programmatic interface. Applications implemented on top of the network operating system would perform the actual management tasks.

4. NOX Overview

5. Programmatic Interface • NOX’s programmatic interface is conceptually quite simple, revolving around : • Events

6. Programmatic Interface (Cont.) • NOX’s programmatic interface is conceptually quite simple, revolving around : • Network View and Namespace

7. Programmatic Interface (Cont.) • NOX’s programmatic interface is conceptually quite simple, revolving around : • Events • Network View and Namespace • Control • Higher-Level Services • Interface and Runtime Limitations

8. Example Application • Switch application • ~/nox/src/coreapps/switch

9. Example Application

10. Example Application (Cont.)

11. Example Application (Cont.)

12. Example Application (Cont.)

13. Example Application (Cont.)