0. A QoS-Enabled OpenFlow Environment for Scalable Video Streaming
Seyhan Civanlar, Murat Parlakışık, A. Murat Tekalp
Burak Görkemli, Bülent Kaytaz, Evren Önem
ARGELA Technologies & Koc University
Istanbul, TURKEY

1. Contents
Shortcomings of QoS in the Current Internet
About OpenFlow
Proposed QoS implementation of OpenFlow
Preliminary QoS routing Formulation
Results and Future Work

2. QoS in the Current Internet
IntServ
Does not scale well
DiffServ
Only per-hop QoS support
MPLS/tunnelling
Lacks on-demand re-configurability
More bandwidth
Current Internet
is ideally suited
for Best Effort traffic 2

3. Router in the Current Internet
Forwarding and route calculation
both on the router
Distributed network controls
Vendor proprietary implementations
Router is a closed box:
Not open for innovation
Classical Router
Route Calculation
Flow Table
Data Forwarding 3

4. OpenFlow: A Future Internet Proposal
Stanford’s Clean Slate Program
Implemented widely in GENI backbone
Enables network slicing
Decouples Data Forwarding and Route Calculation
Open-source
OpenFlow Controller
Route
Calculation
OpenFlow
Protocol
(SSL)
OpenFlow Switch
OpenFlow Switch
OpenFlow Switch
Flow Table
Flow Table
Flow Table
Flow Table
Flow Table
Flow Table
Data Forwarding
Data Forwarding
Data Forwarding
Dumb data-path switches 4

5. Confederated Controllers
Control Layer
Data Layer

6. Other centralized telecom architecturesDB DB
SCP
HLR
location
billing,
announcements
MAP
INAP
MOBILE NETWORK
PSTN
Highly scalable !
Highly reliable !
High performance (per call processing) !
It works! 6

7. Proposed QoS enabled OpenFlow
OpenFlow Controller
Decouple Best Effort and QoS Routing
Calculate QoS Flow Tables in the Controller
Download Flow Tables to Switches
Use available OpenFlow Protocol
No or minimal protocol extension needed
Create QoS Slices
BE Route
Calculation
QoS Route
Calculation
OpenFlow
Protocol
OpenFlow Switch
QoS Flow Table
BE Flow Table
Data Forwarding 7

8. Why OpenFlow for QoS?
Backbone of GENI Network – Large scale experimentation is possible
Allows for ‘network virtualization’
Network slices for QoS
Centralized control paradigm
More visibility into the network resources
Easily programmable
Program controller for QoS routing
Suitable for Lab environment
Well documented Opensource code
Can simulate switches with Linux machines

9. QoS CONTRACT ENTRY INTERFACE
Controller Architecture
QoS CONTRACT ENTRY INTERFACE
QoS CONTRACT
MANAGEMENT
QoS
QoS Contracts
Public Internet
https
ROUTE
CALCULATION
Routes
Resource Monitoring
Resource Signaling
Resource Reservation
QoS Contract Mgmt.
ROUTE /SLICE
MANAGEMENT
Users
NETWORK
MANAGEMENT
Net. data
SECURITY
OPENFLOW NETWORK INTERFACE
SSL
OpenFLow
Network

10. Optimization of QoS Flow Routing
Minimize weighted sum of (packet loss on BE & QoS-route-length)
such that QoS packet loss is zero 5 4
QoS route 1 2 3
BE route 9

11. QoS OpenFlow Demo Setup
Receiver:
SVC Streaming
Client
Forwarder-1
(Ingress)
Forwarder-2
Forwarder-4 (Egress)
Forwarder-3
Controller
Sender:
Server
Controller-Forwarder
messaging I/F
IP network I/F
Public Internet
p1(F1-F2)
p2(F1-F3)
p3(Sender)
p2(F2-F4)
p1(F1-F3)
p2(F3-F4)
p1(F2-F4)
p3(Receiver)
p1, p2, p Ports

12. Messaging using OpenFlow Protocol
Streaming
Server
Forwarder 1
Forwarder 3
Forwarder 4
Client
Forwarder 2
Controller
Configuring network
for QoS request
Polling information from ingress and egress switches
OFPT_STATS_REQUEST
OFPT_QUEUE_STATS
OFPT_FLOW_MOD
QoS Request
QoS Response <QoS id>
Release <QoS id>
Ok <QoS_id>
QoS Flow (streaming video)
Reconfiguring network to respond to congestion
CROSS
LAYER
REQUEST

13. Before QoS rerouting

14. After QoS rerouting

15. Future Work Develop alternate QoS routing algorithms
Simulation studies to assess algorithms
Larger scale experiments on GENI
Assess protocol needs
Address
Controller architecture
Policing of SLA contracts
QoS is an unsolved
Problem for
Future Internet

16. Introducing ARGELA
A leading next-generation software solution provider for mobile and wireline operators in Turkey and EMEA Region
A subsidiary of Turk Telekom, the leading telephone, Internet and IPTV service provider of Turkey with over 20 Million subscribers
Located in Istanbul, Turkey
Formed in 2003 as a startup

17. www.argela.com Thank You!

18. ARGELA Products and Services