SDN - What Is Network Programming
SDN - What Is Network Programming
SDN - What Is Network Programming
Programming?
Software Defined Networking Webinar Series
Speakers: Serges Nanfack
Hostess: Kara Sullivan
19 October 2016
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Network Programming
Serges Nanfack
Technical Manager Africa Corporate Affairs
snanfack@cisco.com
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1. Todays network
2. What is network programming?
3. Why do we need Programmable networks?
4. Technologies that enable programmable networks
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Todays Network
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Digitization Is Changing The World
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Todays IT Model - Complex, Not Fast Enough
Path
Security QoS
Optimization
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Evolution of the Server Configuration
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What is Network Programming?
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Network Virtualization
Traditional Virtualized
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A network device contains the following
planes:
Control plane - This is typically regarded
as the brains of a device.
Used to make forwarding decisions.
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Packet == data + code
Smart hosts, as before
Active nodes that can execute code on the data
Active packets that carry code to active nodes
Postscript analogy
Contains both your data, and the program the printer runs to print your data
Active networks
allow an individual user, or groups of users, to inject customized programs into the nodes of the
network.
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What is programmable
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Why Programmable Network?
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High-level goal
Leverage computation in the network
User pull
Automatically adaptive streaming
Data aggregation to reduce data volumes
Computation closer to users to reduce latency
Industry push
Ad-hoc collection of middleboxes emerging
Replace with generic, multi-purpose active nodes
Otherwise, proliferation of active components will happen anyway, without any common framework
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Big mismatch in rates of innovation
Applications change quickly (e.g., Web, P2P, IM)
The network changes slowly
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What Enables Network
Programming?
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Component-based software engineering
Building blocks for composing software
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Active networks are active in two ways
Switches run code on data flowing through them
Individuals can inject programs into the network
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Execution environment
Virtual machine with access to node resources
General, Turing-complete vs. restricted models
Active applications
Provide an end-to-end, customized service
Load code on to the routers to program the VM
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Join the Next Session : Software Defined Networking
SDN architecture
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Q&A
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Thank you.