1. Week 11 Software Defined Networking (SDN): Use-Cases
Acknowledgement:
Material for several slides is taken from various sources, including research papers, talks, and the SDN academy.

2. SDN can be applied to: Inside data centre WAN connecting data centres
Enterprise networks
Service providers
Mobile networks
Home networks
Internet Exchange points (IXPs)
CDNs

3. Data Centre
Data Centre
Data Centre
WiFi
ISP
Mobile
ISP
NBN

4. Data Centre Networks Nicira/VMware: network virtualisation (NSX)
Agility, cost, choice, security, scale, performance

5. Inter-Data-centre WAN
Google B4 network
Centralised Traffic Engineering and Optimized Routing across G-Scale network
Quickly add new apps (i.e. faster time-to-market)
Able to simulate network functionality
Mix simulated test environment with production network (test scenario to be examined in live network)
Ease of configuration (i.e. a Fabric rather than elements)
High availability
High link utilization (global view of resource supply and demand)

6. Enterprise Networks Security needs: SDN solutions:
VLAN/VRF partitioning
Firewall rules; BYOD; IDS
Application bandwidth policing
SDN solutions:
Centralised security policies
Dynamic (and consistent) updates
Quick response to intrusions
Self-management apps and portals
E.g. large data transfers
“Out-source” security to external providers

7. Service Providers Cost pressures: Virtualised functions
Middle-boxes: CapEx
Config: OpEx
Virtualised functions
NFV
Software on GPU
Revenue opportunities:
Two-sided business model
Content-provider and customer both pay
Network neutrality?

8. Mobile Networks WiFi off-loading Benefits:
ISP
WiFi off-loading
3G to WiFi
Benefits:
Increased total capacity
Seamless connectivity
“Making use of all the networks around us: a case study in android”, ACM SIGCOMM CellNet, 2012
“OpenRadio: A Programmable Wireless Dataplane”, ACM SIGCOMM HotSDN, 2012

9. Access and Home Networks (NBN?)
Quality of Experience:
Work-conference on dad’s laptop more critical than kid’s YouTube
Parental Control:
Block adult/violent sites or OSNs from kid device
Usage and Statistics:
Impose per-device quota
Internet-of-Things (IoT):
Smoke alarms, light-bulbs, door-locks, etc secured at network layer

10. Internet Exchange Points (IXPs)
ISPs inter-connect with each other
De facto protocol: BGP
Problems: free-riding, misconfigurations, …
SDN opportunities:
Contain misconfigurations and free-riding
New APIs for path control, QoE control, time-of-day routing, congestion pricing, …

11. Content Delivery Networks (CDNs)
Content can be fetched from many locations
Dynamic decision taking into account:
Load on content server
Latency and distance
Network capacity and load
“Aster*x: Load-Balancing Web Traffic over Wide-Area Networks”, ONS 2012

12. SDN: where to from here?