1. 1 CERNET2 DVTS Experiences Congxiao Bao Congxiao@cernet.edu.cn 2006-10-31

2. 2 Outline l Introduction l CERNET2 DVTS Experiences – Configuration – Data flow – Reflector development – User controlled testing tools – Traffic monitoring l Lessons we learnt l Remarks

3. 3 CERNET Video Experiences H.323AccessGridDVTS Easy Easy if multicast ready Not Easy

4. 4 CERNET2 Video Trial DVTS (30Mbps)- major application HDTV(27Mbps)-for VoD SDTV-uncompressed (200Mbps)-for interactive VC HDTV-uncompressed(1.2Gbps)-for telemedicine 3D DVTS(60Mbps)-for special demo

5. 5 Our Thinking l DVTS is an exciting and very useful application l DVTS requires special network support (30Mbps, single stream). If we can solve the DVTS transmission problem especially for inter-domain case, we can support other high performance application globally. l We can use CERNET2 to test large scale DVTS system. DVTS is a very good point to start!

6. 6 CERNET2 DVTS Trial l Topology l Node configuration l Data flow l Reflector development l Traffic monitoring l Website support l User controlled testing tools

7. 7 CERNET2 DVTS Topology

8. 8 Node configuration— Ordinary Node (24pops) SenderReceiver CERNET2 backbone From reflectorUniv.’s image display 30Mbps

9. 9 Node configuration—Central Node (1) R R R Reflector array sender switch GE Multicast/unicast T640 12 receivers 13 receivers backup CERNET2 THU sending Reflector array Each reflector receives multicast/unicast stream from sender and converts to 12(13)unicast duplicated copies to 25 different IPv6 hosts distributed in 25 Pops 30Mx25=750Mbps

10. 10 Equipment Configuration— Central Node (2) bjwhgznjsh xacdsytjnlzh chqchszhzhefjnn xmnhzhdlnchchrb pkubuptbuaafdutju Plasma display array PC cluster switch GE 30Mx25=750Mbps PC cluster Each PC receives a DVTS stream from one of the 25 Pops, respectively T640 CERNET2 THU Receiving

11. 11 SJTUXJTU …… JLU CERNET2 switch … … … … 北大 吉大网管 DV CERNET2 national Center THU RRR GE CERNET2 25 DVTS nodes DVTS sending PKU …… JLU CERNET2 switch … … … … PKU JLUNMS DV THU ( national center) RRR GE DVTS sending DVTS receiving DVTS receiving SJTU Data Flow

12. 12 CERNET2 DVTS Video Wall

13. 13 Reflector Development l It runs on Linux OS and developed using g++ l It supports IPv4 and IPv6 l It supports Unicast and multicast (SSM and ASM) l It can reflects 20+ streams with gigabit network card l It will be released as Open source very soon source reflector S SSM multicast unicast

14. 14 Network Traffic Monitoring

15. 15 Website Support

16. 16 User Controlled Testing Support

17. 17 Lessons We learnt (1) l Large-scale DVTS is possible – Network support l 30 nodes for unicast (bandwidth limitation) l Much more nodes for multicast – End pc limitations l completely interactive l Network monitoring integrated tools is very important for the administrator – Isolate network problem and application problem l Self-service tools can dramatically increase the efficiency – User can do the test at any time – Open network and video performance info for users

18. 18 Lessons We Learnt (2) l Non-technique factors –Heavy load of coordination l POC list –Very difficult to do concurrent testing l Website –Standard configuration –Test reports release –Sharing info on common problem solving –Important notice

19. 19 Remarks l Features of our system – Pure IPv6 – Large scale – Multiple reflectors with multicast feeding – User controlled pre-test environment – Real time network traffic monitoring l We will present more technical details tomorrow

20. 20 Thank you!