Martin Casado CTO Nicira Networks ONS2015: http://bit.ly/ons2015sd ONS Inspire! Webinars: http://bit.ly/oiw-sd Watch the talk (video) on ONS Content Archives: http://bit.ly/ons-archives-sd

3. What
OpenFlow
Is
Mar2n
Casado

5. Acknowledgements
Ben
Pfaff,
JusAn
PeBt,
Nick
McKeown,
ScoG
Shenker,
Jianying
Luo,
Natasha
Gude,
Teemu
Koponen,
DK
Moon,
Ben
Pfaff,
Peter
Balland,
Keith
Amidon,
Dan
Boneh,
Tal
Garfinkel,
Michael
Freedman,
Aditya
Akella,
Daniel
Wendlant,
Gregory
Watson,
John
Lockwood,
Mendel
Rosenblum,
Reid
Price,
David
Erickson,
Tim
Hinrichs,
John
Mitchell,
Henrik
Amren,
Junda
Liu,
Rob
Sherwood,
Jesse
Grosse,
Ethan
Jackson,
Jeremy
Stribling,
Alex
Yip,
KK
Yap,
Murphy
McCauley,
Brandon
Heller,
Rajiv
Ramanathan,
Jean
Tourhilles,
Edward
Crabbe,
ScoG
Whyte,
Min
Zuo,
Leon
PouAeksi,
Jim
Wanderer,
Igor
Ganichev,
Teemu
Koponen,
Andrew
Lambeth,
Pankaj
Thakker,
Ronghua
Zhang,
Guru
Parulkar,
Dan
PiG,
Curt
Beckman,
Ali
Yahya,
Kay
Ousterhaut,
David
Ward,
Jan
Medved,
Joe
Tardo,
Puneet
Agarwal,
Dave
McDyson,
Romain
Lenglet,
Simon
Horman
…
and
many,
many
others

6. Prehistory
(2002-­‐2003)

7. Paradise
Lost?
• Limited
redundancy
• Constrained
topology
• Poor
response
to
dynamic
events
• Scaling
limited
by
operaAonal
complexity
Policy
Port
security
policy
rouAng
ACLs
VLANS

8. Networking
in
PracAce
L3 table
Switch/Router
A
B
C
Packet In
Packet Out
L2 table +
VLAN
ACL+ QoS
VRF Context
Port groups
Distributed
Forwarding State
Manual configuration
State

9. The
Problems
…
• Humans
suck
at
state
management
• No
well
defined
APIs
for
datapath
state
• No
general
distributed
algorithms
for
all
datapath
state

10. Developing
OpenFlow
(2004-­‐Now)

11. "How
to
program
a
network”
"How
to
programmaAcally
manage
all
of
the
datapath
state
in
the
network"

12. Problem:
Poor
Forwarding
AbstracAons
L3 table
Switch/Router
A
B
C
Packet In
Packet Out
L2 table +
VLAN
ACL+ QoS
VRF Context
Port groups
• Fixed
funcAon
• Oden
expose
implementaAon
details
• Non-­‐standard/non-­‐existent
state
management
APIs

13. SoluAon:
Generalize
Dataplane
Flow table
Switch/Router
A
B
C
Packet In
Packet Out
Flow table Flow table
OpenFlow

14. Problem:
Distributed
CompuAng
is
Hard
Forwarding
Hardware
Forwarding
Hardware
Forwarding
Hardware
Forwarding
Hardware
Forwarding
Hardware
Software
control
Software
control Software
control
Software
control
Software
control

15. SoluAon:
Decouple
DistribuAon
Model
from
Topology
Forwarding
Hardware
Forwarding
Hardware
Forwarding
Hardware
Forwarding
Hardware
Forwarding
Hardware
OpenFlow
OpenFlow
OpenFlow
OpenFlow
OpenFlow
Software control

16. A
Sensible
(Humdrum)
System
Stack
Decouple
Control
Logic
Hardware
Hardware
AbstracAon
Layer
Control
ApplicaAon

17. A
Sensible
(Humdrum)
System
Stack
Decouple
Control
Logic
Hardware
Hardware
AbstracAon
Layer
Ethane
Distributed
Compiler
Hardware
Policy

19. The
Network
OperaAng
System
Decouple
Control
Logic
Hardware
Hardware
AbstracAon
Layer
Control
ApplicaAon

20. The
Network
OperaAng
System
Decouple
Control
Logic
Hardware
Hardware
AbstracAon
Layer
Network
OS
ApplicaAon
OpenFlow
Hardware
SDN

21. OpenFlow/SDN
FAQ

22. What
is
the
Primary
Value
ProposiAon?
• Ability
to
innovate
within
the
network
• Horizontal
integraAon
– Market
efficiency
– Rapid
innovaAon
at
each
layer

23. Does
OpenFlow
Offer
New
FuncAonality?
• Not
really
…

24. Does
SDN
Scale?
• Yes

25. A
RestrospecAve
on
the
Future
of
OpenFlow
(Now-­‐??)

26. Is
OpenFlow
…
• …
a
new
idea?
• …
well
designed?
• …
a
path
to
new
funcAonality?

27. So
What
is
the
Cause
of
its
Success?

28. You