disaggregating the sdn control plane · copyright © ciena corporation 2018. all rights reserved....

Copyright © Ciena Corporation 2018. All rights reserved. Confidential & Proprietary.

Disaggregating the SDN Control Plane

David BainbridgeCiena Corporation

Open Networking Summit – EuropeSeptember 25 - 27, 2018

Copyright © Ciena Corporation 2018. All rights reserved. Confidential & Proprietary. 2

For millions of happy users all over the world, the iPhone is fantastic just as it is. It's beautiful, elegant and easy to use, and

there are thousands upon thousands of apps and oodles of content for them to choose on the App Store.

And then there are the people who aren't so happy. People who want to break free of the restrictions they believe Apple has forced upon us all -from the default apps that come with iOS to the fact that its underlying structure cannot be customized by individual programmers, third-party developers or even users themselves.”

From macworld.co.uk article by Rob Mead-Green, April 13, 2017


Jail Breaking SDN

ProtocolManagement

Message Distribution

Inventory FlowManagement

IntentManagement

Telemetry

Prediction &

Resolution(ML)

SDNApplication

SDNApplication

SDNApplication

ProtocolManagement


IntentManagement

Telemetry

Prediction &

Resolution(ML)

SDNApplication

SDNApplication

SDNApplication

Process/Language/Scale/Failure Boundary


Control Plane Disaggregation

Minimal ViableController Components

ProtocolManagement



IntentManagement

Telemetry

Prediction &

Resolution(ML)

SDNApplication


Scale – From the Simple

ProtocolManagement



IntentManagement

Telemetry

Prediction &

Resolution(ML)

ProtocolManagement

SDNApplication


Scale – To the Complex

ProtocolManagement

Local Message Distribution

Inventory FlowEnforcement

IntentEnforcement

Telemetry

Prediction &

Resolution(ML)

ProtocolManagement

ProtocolManagement


Inventory FlowEnforcement

IntentEnforcement

Telemetry

Prediction &

Resolution(ML)

ProtocolManagement



IntentManagement

Telemetry

Prediction &

Resolution(ML)

SDN Application

SDN Application

SDN Application


Failure Boundaries

ProtocolManagement



IntentManagement

Telemetry

Prediction &

Resolution(ML)

ProtocolManagement

Inventory

External and Redundant

State

Fail over between protocol managers is

more complicated


The [One] Problem With [Today’s] SDN [Solutions]


Writing a Multi-Controller SDN Application Today


OFtee, An Experiment in Control Plane Disaggregation


The Inspiration

Linux tee

STDOUT

FILE

INPUT


Adapting to Open Flow

Open Flow tee

CONTROLLER

SDNAPPLICATION

OF DEVICE


Adapting to Open Flow

Open Flow tee

CONTROLLER

SDNAPPLICATION

OF DEVICE

SDNAPPLICATION

SDNAPPLICATION

fan


What it does

To the controller, OFtee is the device; To the device, OFtee is the controller

CONTROLLER

SDNAPPLICATION

OF DEVICE

SDNAPPLICATION

SDNAPPLICATION

DPID0x0000ae0a2807a44c0x00000aa0522a5341…0x000076ca89d59249

FeaturesReply

PacketIn

Fwd Packet

dl_type=0x888e http://aaa-app:9191/eap

Match Action

http://arper:8080/arpdl_type=0x0806

http://linker:1234/linkdl_type=0x88cc

… …

PacketOut


What it doesn’t

https://arxiv.org/pdf/1805.09250.pdf

Umbrella: A Unified Software Defined Network Programming Framework

• Motivation– Increase portability of SDN applications and services across heterogeneous SDN controllers, making it

easy to compare results and application performance on various controllers.

• Main Design Goals:

• Provide a new set of abstractions for SDN applications, keeping the abstractions independent of the NBAPIs that specific SDN controllers offer.

• Create a framework that offers increased scalability by following a hybrid approach that incorporates areactive paradigm for writing applications that manage SDN networks as well as the traditional proactiveparadigm.

• Reduce programming complexity by providing a software defined network programming framework that,allows a programmer to write SDN applications without requiring a programmer to master low-level detailsof specific SDN controllers, and avoids locking an application to a specific controller.

• More info:– http://umbrella-project.org

– CS Systems Research Group, Purdue University, https://systems.cs.purdue.edu

https://arxiv.org/pdf/1805.09250.pdf


Complexities

•

•

•

•

•


Demonstration

* More on this later

SDN NetworkDocker Mgmt Network

OVS

Client

Controller

ONOS & ODL

OF TEE

DHCP L3 Relay

EAPOL / AAA

ISC DHCPServer

Free RADIUSServer

OVS Controller

Proxy To

Tee

To


Demonstration

https://youtu.be/QzDDe59MCdw


Well and Good, but …

ProtocolManagement



IntentManagement

Telemetry

Prediction &

Resolution(ML)

SDNApp

SDNApp

SDNApp

ProtocolManagement


IntentManagement

Telemetry

Prediction &

Resolution(ML)

SDNApp

SDNApp

SDNApp

Process/Language/Scale/Failure Boundary

A disaggregated control plane still needs to be built And we don’t want

https://xkcd.com/927/


Links

• https://github.com/ciena/oftee

• https://github.com/dbainbri-ciena/oftee_workspace

• https://youtu.be/QzDDe59MCdw

https://github.com/ciena/oftee

https://github.com/dbainbri-ciena/oftee_workspace

https://youtu.be/QzDDe59MCdw

disaggregating the sdn control plane · copyright © ciena corporation 2018. all rights reserved....

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