1. Software Defined Networking
By:
Widhi Yahya

2. Introduction

3. Mininet
Mininet is a simulation tool that can create a virtual network, running real kernels, switches and application code, on a single machine.
Mininet provides a ready way to get the SDN network behaviors and performance for different experimental network topologies.
Mininet also enable us to use client server programs such as ping, iperf, netperf, wget, and other packet generator programs.

4. Nowdays Complexity that leads to stasis Inconsistent policies
Inability to scale
Vendor dependence
enormous installed
equipment and protocols
barrier to entry for new ideas

5. Software Defined Networking (SDN)
App
Specialized
Features
Control
Plane or
Open Interface
Specialized
Control
Plane
Merchant
Switching Chips
Open Interface
Specialized
Hardware
Vertically integrated
Closed, proprietary
Slow innovation
Horizontal
Open interfaces
Rapid innovation
Nick McKeown, “How SDN will shape networking”, Standford Univ.

6. Software Defined Networking (SDN)
2. At least one Network OS probably many. Open- and closed-source
Control Program
Control Program
Global Network View
Network OS
1. Open interface to packet forwarding
Packet
Forwarding
Packet
Forwarding
Packet
Forwarding
Packet
Forwarding
Packet
Forwarding
Nick McKeown, “How SDN will shape networking”, Standford Univ.

7. Software Defined Networking (SDN)
Open Network Foundation, “OpenFlow Switch Specification”, 2013.

8. Software Defined Networking (SDN)
[ONF12]-Software-Defined Networking-newnorm

9. Software Defined Networking (SDN)
Open Network Foundation, “OpenFlow Switch Specification”, 2013.

10. Motorola

12. Openflow Switches

13. Openflow Controller

14. Software Defined Networking (SDN)
2:match(dstip=A)[fwd(2)]
1:match(* )[fwd(1)]
2:match(dstip=B)[fwd(3)]
OpenFlow
Program
Priority
Pattern
Action
Counters for each rule
- #bytes, #packets
Route: IP/fwd
dstip=A A 2 1 3 B
dstip!=A
dstip!=B
dstip=B
Open Network Foundation, “OpenFlow Switch Specification”, 2013; Chris Monsanto*, Joshua Reich*, Nate Foster^, Jen Rexford*, David Walker*, “Composing Software-Defined Networks”,USENIX, 2013

15. Benefit SDN Centralized control of multi-vendor environments.
Reduced complexity through automation.
Higher rate of innovation
Increased network reliability and security
More granular network control
Better user experience

16. SDN Review
Software Defined Networking (SDN) is a concept to decouple the control plane and data plane of network devices.
The emergence of the SDN technology brings many new network applications realized by programming the SDN controller.

17. Problems
Naive Algorithm (Round Robin)

18. Problems example
Naive Algorithm (Randomized)

19. Global Topology

20. SDN Program
install_flowmod(5,srcip=X & dstip=P,[mod(dstip=A), fwd(2)])
install_flowmod(4,srcip=0* & dstip=P,[mod(dstip=A), fwd(2)])
install_flowmod(4,srcip=1* & dstip=P,[mod(dstip=B), fwd(3)])
install_flowmod(4,srcip=X & dstip=A ,[fwd(2)])
install_flowmod(4,srcip=X & dstip=B,[fwd(3)])
install_flowmod(3,dstip=A,[fwd(2)])
install_flowmod(3,dstip=B,[fwd(3)])
install_flowmod(2,srcip=X ,[fwd(1)])
install_flowmod(1,*,[fwd(3)])

21. Frenetic
N. Foster, R. Harrison, M. J. Freedman, C. Monsanto, J. Rexford, A. Story, and D. WalkerFoster, “Frenetic: A Network Programming Language”, ACM, 2013.

22. Pyretic Basic Policies
Policy
Syntac
Semantics
Examples
match
match(f=v)
Returns set containing packet if packet's field f matches value v, empty set otherwise
match(dstmac=EthAddr('00:00:00:00:00:01'))
drop
Returns empy set
modify
modify(f=v)
Returns set containing copy of packet where field f is set to value v
modify(srcmac=EthAddr('00:00:00:00:00:01'))
forward
fwd(a)
Returns set containing copy of packet where outport field is set to a
fwd(1)
parallel composition
A + B
Returns the union of A's output and B's output
fwd(1) + fwd(2)
sequential composition
A >> B
Returns B's output where A's output is B's input
modify(dstip=IPAddr(' '))>>fwd(2) match(switch=1) >> flood()
Pyretic Website,

23. Query Policies Pyretic
Syntax
Summary
packets( limit=n, group_by=[f1,f2,...])
callback on every packet received for up to n packets identical on fields f1,f2,...
count_packets( interval=t,group_by=[f1,f2,...]
count every packet received callback every t seconds
providing count for each group
count_bytes( interval=t, group_by=[f1,f2,...])
count every byte received callback every t seconds providing count for each group
Pyretic Website,

24. Q & A
Thank you