Software De ned Networking and Network Virtualization · Software De ned Networking (SDN) Network...

MotivationSoftware Defined Networking (SDN)

Network VirtualizationUse Cases

Deployment on University CampusesCloud IaaS Platform

Software Defined Networking and NetworkVirtualization

Aryan [email protected]

October 02, 2013

Aryan TaheriMonfared [email protected] Software Defined Networking and Network Virtualization




Agenda1 Motivation2 Software Defined Networking (SDN)

DefinitionWhat is OpenFlow?AdvantagesDisdvantages

3 Network VirtualizationDefinition

4 Use Cases5 Deployment on University Campuses

ChallengesStakeholdersHow?Examples

6 Cloud IaaS PlatformBird ViewData Centre ViewNetworking inside a RackTenant Network Logical ViewChallengesExamples





Outline1 Motivation2 Software Defined Networking (SDN)










Traditional Data Network

Functionality implemented in dedicated appliance or ASIC

Proprietary appliances/APIs

Individual configuration

Time consuming/error prone configuration

Automating tasks by (home-grown) scripts

Lack of communication between application & network

Slow & costly service innovation






Problem?

Nick McKeown

See references.






What is Software Defined Networking?

Separating the control plane from the forwarding plane physically.

Controlling several forwarding devices with single control plane.

Making clear the distributed systems problem.(⇒ Solve the problem once!)

Configuring flows from global view.






What is Software Defined Networking?

SDN is a mechanism not a solution

Provides: more control, better guarantees, NOT necessarilysimplicity

Can be combined with backup path/other decision-making process

Implementations: SANE, Ethane, OpenFlow






SDN is based on Abstraction

Forwarding Abstraction:OpenFlow API ∼ x86 instruction set

State Distribution Abstraction:Single state distribution mechanism, well-known convergenceproperties, re-usable (new protocol 9 new state distribution mech.)

Specification Abstraction:Interacting with network as a single device






What is OpenFlow?

Network Operating Systems convey configuration of global networkview to actual physical devices

One possible definition of how to model the configuration of aphysical device






Traditional Switch






OpenFlow Capable Switch






OpenFlow Capable Switches






Distributed OpenFlow Controller






Pros:

Global view of network demands and fabric resource

Makes it easier to control diverse switches

Deterministic and dynamic flow placement

Efficient provisioning/releasing resources

⇒ Faster convergence

⇒ Higher utilization

⇒ More fault-tolerant






Cons:

OpenFlow is in early stages

Controllers are not mature yet

Upgrading HW/SW is required

Flow programming is not simple/fast

Northbound APIs in controllers are not standard (Adapting the sameapplication to different controllers)





Definition











Definition

What is Network Virtualization?

Faithful logical reproduction of physical network services.

Decoupling the (virtual) network services from the physical network.

Coexistence of multiple virtual networks on the same physicalsubstrate.

Simplifies administration.

It’s a solution.

SDN can be used for building Virtualized Networks.





SDN/VN Use-cases

Deployment on university campuses

WAN optimization

Flexible virtualization platform

Security services

Bandwidth on demand applications

Multipath networking for higher utilization and efficiency

Network administration

Mobility






Challenges in University Campus Network

Diverse use-cases: vending and training machines, fire alarms,monitoring systems, BYOD, mission critical systems, innovationinfra. etc.

Diverse requirements: secure communication, openness,virtualization, etc.

Vertical integration: Network HW, OS, and applications are tightlyintegrated in a single product

Lack of open standard APIs: Inflexible home-grown scripts

High costs: WiFi, Videos, Big Data-Large Bandwidth

Mismatch between innovation pace in computing and networking






Who will benefit from?

Campus Central IT: Operation efficiency

Networking Research Community: Using slices of productionnetwork

Research Community (with huge datasets): High energy physics,Bioinformatics, etc.






How can you benefit from?

Virtualization: Virtual networks independent of underlyingL1/L2/L3

Advanced Forwarding

Programmability: Developing other applications on top






Examples:

Disaster recovery

On-demand provisioning/de-provisioning of network slices

Multipath TCP (e.g. Large volume data transfer)

Compliant virtualized networks (e.g. Payment Card Industry DataSecurity Standard (PCI DSS) for POS)





Bird ViewData Centre ViewNetworking inside a RackTenant Network Logical ViewChallengesExamples












Multiple Cells






Single Cell






Inside a Rack






Inside a Compute Node






Network Logical View






Any Networking Challenges?






Any Networking Challenges?

Yes, lots of them :)

Deployment complexity

Maintenance cost

Tenant’s network isolation and end-to-end connectivity

Tenant’s traffic monitoring

Security enforcement






OpenFlow Enabled Cloud Infrastructure






Cloud Infrastructure Monitoring 1






Cloud Infrastructure Monitoring 2






Cloud Infrastructure Quarantine Zone






References

http://www.sciencedirect.com/science/article/pii/S1389128609003387

http://yuba.stanford.edu/foswiki/pub/OpenFlow/Deployment/CampusMeeting06152011/Stanford_OpenFlow.pdf

http://www.sdncentral.com/sdn-use-cases/

http://www.youtube.com/user/stanfordopenflow

www.stanford.edu/~nikhilh/pubs/handigol-acld10.pdf

http://www.openflow.org/wk/index.php/OpenFlow_Wireless

https://github.com/OPENNETWORKINGLAB/flowvisor/wiki

http://www.openflow.org/downloads/technicalreports/openflow-tr-2009-1-flowvisor.pdf

https://storage.cloud.google.com/networking/SDN/GoogleSDN.pdf


http://www.openflowhub.org/blog/blog/2012/12/03/sdn-use-case-multipath-tcp-at-caltech-and-cern/

http://www.opennetsummit.org/pdf/2013/market_opps/sdn_valuechain.pdf

http://www.opennetsummit.org/pdf/2013/presentations/nick_mckeown.pdf

An attempt to motivate and clarify Software-Defined Networking (SDN)

A Case for Expanding OpenFlow/SDN DeploymentsOn University Campuses


http://www.sciencedirect.com/science/article/pii/S1389128609003387

http://yuba.stanford.edu/foswiki/pub/OpenFlow/Deployment/CampusMeeting06152011/Stanford_OpenFlow.pdf


http://www.youtube.com/user/stanfordopenflow

www.stanford.edu/~nikhilh/pubs/handigol-acld10.pdf

http://www.openflow.org/wk/index.php/OpenFlow_Wireless

https://github.com/OPENNETWORKINGLAB/flowvisor/wiki

http://www.openflow.org/downloads/technicalreports/openflow-tr-2009-1-flowvisor.pdf

https://storage.cloud.google.com/networking/SDN/GoogleSDN.pdf


http://www.openflowhub.org/blog/blog/2012/12/03/sdn-use-case-multipath-tcp-at-caltech-and-cern/

http://www.opennetsummit.org/pdf/2013/market_opps/sdn_valuechain.pdf

http://www.opennetsummit.org/pdf/2013/presentations/nick_mckeown.pdf





Q?A!

Thank you!






Deployment complexity and Maintenance cost

Increased number of networking devices by the factor of cluster size

Virtualized networking devices






Tenant’s traffic isolation and end-to-end connectivity

VLAN tagging

GRE tunnels, EoIP tunnels

Namespaces in Linux networking stack






Tenant’s network monitoring

How to distinguish between tenants’ traffic?

VLAN IDs? GRE addresses? Namespaces?

How to get the information in real-time?

Querying: network management service? platform controller? eachcompute node?






Security enforcement

Where to put security middle boxes?

How to control and federate them with the rest of platform’scomponents?


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