SDN :: Software Defined Networking –2017 Executive Overview

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SDN :: Software Defined Networking –
2017 Executive Overview
PI: Prof. Christian Esteve Rothenberg
19/10/2017 @ Padtec, Ca...

2
What is SDN (Software-Defined Networking)?

3
So, what is SDN?
“OpenFlow is SDN, but SDN is not OpenFlow” ̶̶̶̶̶̶̶̶̶ Networking community
(Does not say much about SDN)...

4
SDN to the rescue!

5
SDN evolving definitions
• With the original (OpenFlow) definition, SDN represented a network architecture
where the for...

6
Tens of Millions of lines of code
Closed, proprietary, outdated
Hundreds of protocols :: 6,500 RFCs
Billions of gates
Po...

7
When you need a new feature…
Source: Nick McKeown. “Programmable forwarding planes are here to stay”. In ACM SIGCOMM Net...

8
When you need a new feature…
1. Equipment vendor can’t just send you a software upgrade
2. New forwarding features take ...

9
The SDN Trend
Source: ONF

10
Networking & Domain Specific Processors
CPU
Computers
Java
Compiler
GPU
Graphics
OpenCL
Compiler
DSP
Signal
Processing
...

11
Network equipment as
Black boxes
Open interfaces (OpenFlow) for
instructing the boxes what to do
SDN
Boxes with autonom...

12
Whitebox SDN :: Shift to Open & Flexible
Source: Adapted from Chris Rice (AT&T Labs), Whitebox and Autonomous Networks
...

13
Whitebox :: Disaggregation of Network Elements
Source: *Chris Rice (AT&T Labs), Whitebox and Autonomous Networks

14
Whitebox :: Opportunity & Benefits
Opportunity
• Not Custom Built
• Open Platform/Interfaces
• Off-the-Shelf Technology...

15
Whitebox :: Opportunity & Benefits
Benefits
• Modular with Open Interfaces
• Built on Merchant Silicon
• Lower CAPEX an...

17
Challenge: Current hardware-centric path is unsustainable*
Source (Adapted) : Chris Rice (AT&T Labs), Whitebox and Auto...

18
NFV :: Sisyphus on Different Hills
Source: Telefonica I+D / ETSI NFV

19
A means to make the network more flexible and simple by
minimising dependence on HW constraints
Network Functions Virtu...

20
SDN & NFV :: Strategic Paradigms for Network Operators
Source: ETSI NFV ISG

21 SDN & NFV :: Network Programmability / Flexibility
Source: Ahmad Rostami (Ericsson Research) [http://www.itc26.org/file...

23
Why Network Softwarization, i.e., NFV/SDN?
1. Virtualization: Use network resource without worrying about where it is
p...

24
Key benefits of programmable forwarding
1. New features: Realize new protocols and behaviors very quickly
2. Reduce com...

25
How (data plane) programmability is being used
• Subtract features: Reducing complexity
• Add proprietary features: Inv...

26
Domain Specific Processors
CPU
Computers
Java
Compiler
GPU
Graphics
OpenCL
Compiler
DSP
Signal
Processing
Matlab
Compil...

27
Barefoot Tofino 6.5Tb/s Switch (Dec. 2016)
65 x 100GE (or 260 x 25GE)
[Same power and cost as fixed-function switches]
...

28
Network Softwarization (i.e., NFV/SDN/xyz)
Existing / Old
• CLIs
• Closed Source
• Vendor Lead
• Classic Network Applia...

29
* e.g., https://www.sdxcentral.com/directory/nfv-sdn/comprehensive-list-of-sdn-apis/
Network Softwarization (i.e., NFV/...

30
SDN/NFV Open Source & Standardization
Evolving and accelerating the path to standardization
Further Reading:
• IETF Tre...

31
Standard Development & Open Source Organizations
Source: SDN IEEE Outreach, http://sdn.ieee.org/outreach

Open Source Building Blocks
2015 – 2017: Several New Foundation-incubated Projects
Source: The Open Source NFV Eco-system ...

33
Challenges: Closed vs. Open
Source: Open Source in a Closed Network – Prodip Sen (OPNFV Summit 2015)

34
* https://www.networkworld.com/article/2162002/lan-wan/chambers--cisco-will-be-more-of-a-software-and-services-company....

SDN ocean :: Technologies for multiple problems
Source: B. Briscoe, slides-84-sdnrg-0.pdf

36
Network Programmability :: Layers & Scope
Source: CISCO, Network Programmability Specialist
https://learningnetwork.cis...

37
Network Programmability
– Industry Job Role Evolution and Certifications
https://learningnetwork.cisco.com/thread/62683...

38
SDN asks (at least) three major questions
Where the control plane resides
“Distributed vs Centralized” ?
How does the C...

39
Different SDN Models Control-plane component(s) Data-plane component(s)
Canonical/Open SDN
Traditional
Hybrid/Broker Ov...

40
Legacy
Different Models to Program / Refactor the Stack
Data Plane
Mgm.APIs
Distributed
L2/L3
Control Plane
Managemt
So...

Software-Defined Knowledge Plane
Source: http://knowledgedefinednetworking.org

Autonomous (Zero-Touch) Networks :: ML/AI + SDN + BIG DATA
Source (Adapted) : Chris Rice (AT&T Labs), Whitebox and Autonom...

43
ZTN (Zero-Touch Network) [Google]
Source: 2017 Google Networking Research Summit Keynote Talks, https://www.youtube.com...

44
Limits of
human understanding
Technological limits
Hand Crafted Code
Modeling + Code Gen
+ ML/AI (?)
Slide courtesy ada...

45Source: Optical Network Virtualisation using Multi-technology
Monitoring and SDN-enabled Optical Transceiver,

46Source: Optical Network Virtualisation using Multi-technology
Monitoring and SDN-enabled Optical Transceiver,

Thanks! Obrigado! (More) Questions?
chesteve@dca.fee.unicamp.br
http://www.intrig.dca.fee.unicamp.br

• Assistant Professor (tenure track) at FEEC/UNICAMP (since 2013)
• PI leading the INTRIG lab at DCA/FEEC/UNICAMP
INTRIG :...

Research Interests & Results*
Software
Defined
Networking
Information
Centric
Networking
Network
Functions
Virtualization
...

Open Source Research Artifacts
Technical lead of successful open source projects
(see https://github.com/chesteve & https:...

Open Source minded Research
• Extensive use of open source tools in support of research activities.
• Etherpad, Owncloud, ...

52
Intellectual History of Programmable Networks
Source: N. Feamster, J. Rexford, E. Zegura. The Road to SDN: An Intellect...

53
SDN to the rescue!

55
SDN asks (at least) three major questions
Where the control plane
resides
“Distributed vs Centralized” ?
• What state b...

56
SDN asks (at least) three major questions
• Prop. IPC
• OpenFlow (with or w/extensions)
• Open Source south-bound proto...

57
SDN asks (at least) three major questions
• Levels of Abstraction
• Domain Specific Language
• Open APIs
• Standardized...

58
Towards one pragmatic definition
SDN functionally
• enables the network to be accessed by operators
programmatically;
•...

Broad/Generalized SDN definition
• Architectural approach that optimizes and simplifies network operations by
more closely...

What do we get from SDN?
• An architecture that
• brings the network and networking data closer to the application layer,
...

Network Programmability
• One of the major parts of what SDN and OpenFlow proponents are trying to achieve is
greater and ...

62https://learningnetwork.cisco.com/thread/62683

63
AT&T Whitebox :: NOS Open Architecture

64
Whitebox :: Common Infrastructure Data

65
Source: 2017 Google Networking Research Summit Keynote Talks, https://www.youtube.com/watch?v=5N7QS5vP68o

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Source: 2017 Google Networking Research Summit Keynote Talks, https://www.youtube.com/watch?v=5N7QS5vP68o

67
Declarative Network Configuration

68
Model-driven network management
Source: J. George, A. Shaikh (Google), Better management of large-scale, heterogeneous ...

69
OpenConfig tooling examples available

70
Challenges in thinking “model-driven”
• CLI habits are hard to break
• implementations are often very different
(occasi...

71
Model-based automation in practice
• Operationalizing models -- many problems to be solved
• protocol-agnostic RPC spec...

72
Google ZTN (Zero-Touch Network)
Source: 2017 Google Networking Research Summit Keynote Talks, https://www.youtube.com/w...

73
Intent-based networking system
• Translation and Validation– The system takes a higher-level business policy
(what) as ...

74
Intent-based networking system
Source:

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NETWORK TELEMETRY AND AUTOMATION
Juniper Networks Junos Automation with Gurudatt Shenoy - YouTube
Juniper Networks Stre...

76
SDON :: : Packet-fixed-flexible Demonstration
Software-Defined Optical Networks Technology and Infrastructure: Enabling...

Starting point: P4 Model & Targets

78
P4 Runtime Open-source project to remotely control P4 switches1
Remote Control Plane
Switch
OS
Switch
OS
Switch
OS
Swit...

79
Universal Laws and Architectures

80
P3 trade-offs: Programmability, Performance, Portability
:: packets/sec processed
(could be normalized per Energy or Co...

81
P^3 trade-offs in Network Softwarization
Realm of
the
Impossibl
e?
Plane of
the
Possible?
Performance
Performance
Porta...

82
Programmability
Portability
P3 trade-offs: Programmability, Performance, Portability
ASIC
NPU
CPU
Performance
+
How por...

83
P3 trade-offs: Programmability, Performance, Portability
How to push the hard limits?

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