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SDN Evolution: the View from Academia
Dr Brendan Jennings 31st March 2015
15/04/2023 2
• Telecommunications software research group founded in 1996 by
Dr Willie Donnelly and Eamonn de Leastar
• Currently ~120 members:
• 20% post-doctoral researchers and PhD students
• 80% engineers / project managers / entrepreneurs / support staff
• One of Ireland’s leaders in EU collaborative R&D (FP5-7, Horizon
2020); worked in projects with 500+ organisations
• Completed 100+ direct industry projects in Ireland over the past 5
years
• Created a number of spin out companies, including Feedhenry
www.tssg.org
TSSG overview
15/04/2023 3
• Network Architectures: what abstractions best realise the potential
of nascent network virtualisation technologies?
• Management Techniques: what algorithms, protocols and tools do
we need to manage programmable networks in a scalable manner?
• Information Security: how do we ensure that networks and the
services they support are properly protected from security threats?
• Engineering Services: what design patterns, tools and
methodologies do we need to better engineer communications
services?
• Harnessing Data: how do we harness the data flowing through
networks to optimise the network and provide value to service users?
www.tssg.org
TSSG research areas
Software Defined Networking
15/04/2023 4www.tssg.org
SDN still a hot academic topic
15/04/2023 5
• Intelligent Networks: 80s, 90s
• Active Networks: 90s, 00s
• Overlay Networks: 90s, 00s
• Software Routers: early 00s
• Open Signalling: early 00s
www.tssg.org
It always was…
15/04/2023 6
• OpenFlow based SDN seeing deployment
– Network virtualisation in multi-tenant data centres
– Enterprise WANs
• Heralds a paradigm shift for networking
– Software based Network Orchestration
– Control Plane Modularity
– Network Virtualisation – separating of mechanism from
policy
www.tssg.org
SDN: the positives
15/04/2023 7
• No separation between specification of goals
(policy) and their implementation (mechanism) in
OpenFlow
• Handles packet forwarding only, not packet
processing
– Ignores widespread deployment of middleboxes
• Vendor lock-in problem not really solved
• Focus on single network domainswww.tssg.org
SDN: the negatives
15/04/2023 8
• Scott Shenker’s view of the evolutionary steps:
– Control plane modularity (OpenFlow)
– Network Virtualisation (mechanism/policy separation)
– Push the implementation of policy to the edge
(simplified core network, á la MPLS)
– Software at the edge (service virtualisation)
– Plus: learn from the Linux, Cloud and Data Analytics
ecosystems!
www.tssg.org
SDN evolution
15/04/2023 9
• TSSG-coordinated FP7 project looking at SDN
deployment in Data Centres
– Monitoring and Metrics
– Resource Allocation
– Network Search
www.tssg.org
TSSG and SDN: SOLAS project
15/04/2023 10www.tssg.org
Thank you for your attention
Any questions?