1. Author: Daniel Guija Alcaraz
Networking with the world LIGHTNING TALK: REAL TIME QUALITY OF SERVICE PATHFINDER
Author: Daniel Guija Alcaraz

2. Motivation and proposal
Real Time applications and services demand of customized and dynamic end-to-end Quality of Service (QoS) to provide a desired quality of experience
The proposal:
Thanks to SDN’s Openflow implementation, we can design and develop a Traffic Engineering and Quality of Service algorithm to build up a real time Software Defined Network Application (SDNApp) solution based on NaaS (Network as a Service) paradigm

3. Approach and Goals Our approach:
Pathfinder SDNApp is an external module that works with a “Less-greedy algorithm” that considers network-wide traffic implications while finding an optimal global path solution
Main goals:
- Dynamic and on-demand provisioning of network resources to provide Real Time Quality of Service over an Openflow network
- Adapt the control plane to meet QoS requirements of real time applications
- On-demand configuration of the forwarding plane

4. Benefits
Pathfinder SDNApp enables real time applications to dynamically demand custom and end-to-end QoS over an Openflow network to meets application’s requirements or constraints
“Less-greedy” approach avoids routing through links that would be potentially congested by network traffic
- It considers minimum hop count, requested bottleneck and/or additive QoS parameters
Upon application requirement changes, automatically generates flow rules to achieve QoS requests and dynamic re-configuration of network path
App architecture allows use of custom algorithms and network state monitorization by retrieving statistics to re-route traffic in case of QoS violiations

5. Algorithm Network Abstraction
Real time graph abstraction network topology with end-to-end attachment points, edges and nodes
REST API
SDN Controller
Real time network topology

6. Finding a path
1. Graph reduction
2. Feasible paths subgraph
3. Bidirectional suitable path, selected upon minimum hop count and maximum bandwidth available
Switch-port Queue mechanism to guarantees a minimum bandwidth

7. Minimum bandwidth threshold: 10 Mbps
Preliminary Results
Minimum bandwidth threshold: 10 Mbps
TCP flow throughput performance comparison: Queue mechanism on a non-congested network

8. THANK YOU! The poster Daniel Guija Alcaraz (BarcelonaTECH – UPC)
Iris Bueno Rodríguez (DANA, I2CAT Foundation)
Eduard Escalona (DANA, I2CAT Foundation)
The poster