1 QoS monitoring and SLS auditing TEQUILA, Amsterdam January 25 th, 2001 Victor Reijs

2 QoS monitoring and SLS auditing Outline Application QoS demands… Monitoring network QoS… SLS auditing...

3 QoS monitoring and SLS auditing QoS where? SLS auditing... Application QoS demands... Monitoring network QoS...

4 QoS monitoring and SLS auditing Application QoS demands Some QoS demands are known To be studied QoS demands...

5 QoS monitoring and SLS auditing To be studied QoS demands Determine compelling applications: ftp, H.323, streaming, MPEG-x, computational grid Literature study... Simulate impaired network... Determine perceived quality of application...

6 QoS monitoring and SLS auditing Literature study /nat_infrastruct/perceived.html Some prilimarly results…

7 QoS monitoring and SLS auditing Some prilimarly results: TCP

8 QoS monitoring and SLS auditing Some prilimarly results: MPEG-2

9 QoS monitoring and SLS auditing Some prilimarly results: Y.1541

10 QoS monitoring and SLS auditing Simulate impaired network Determine micro-flow QoS parameters –transfer delay and delay variation –loss rate and error rate (like out-of-order) –available bandwidth Change behaviour within micro-flow (AF) Change of network load –unloaded –over provisioned (?) –loaded

11 QoS monitoring and SLS auditing Determine perceived quality of application n-dimensional space Providing input for debugging: –application behaviour –network behaviour

12 QoS monitoring and SLS auditing QoS where? SLS auditing... Application QoS demands... Monitoring network QoS...

13 QoS monitoring and SLS auditing Monitoring network QoS Methods in principle not part of this activity Must come out of other TF-NGN activities: unloaded, OvNet, diff. Serv., int. Serv. Monitoring PHB parameters average traffic, loss per queue, queue length, etc. Monitoring network routing, topology, etc.

14 QoS monitoring and SLS auditing QoS where? SLS auditing... Application QoS demands... Monitoring network QoS...

15 QoS monitoring and SLS auditing SLS auditing Defining environments… Gathering reference models… Freezing definitions… Inventorying/evaluating tools... Deliverables...

16 QoS monitoring and SLS auditing Defining environments Micro flow environment looking at applications, end-to-end Aggregated environment PHB

17 QoS monitoring and SLS auditing Gathering reference models Existing SLS’s TEQUILA IETF (IPPM) Internet2 e2e performance...

18 QoS monitoring and SLS auditing Freezing definitions Freeze reference model and its options What to measure: –micro-flow... –aggregated...

19 QoS monitoring and SLS auditing Micro flow Path and peering points –delay transfer (one way???) and delay variation –loss rate and error rate –available/peak bandwidth –...

20 QoS monitoring and SLS auditing Aggregated Per hop –average load/available bandwidth –loss rate per queue/class –queue length per class Path –routing

21 QoS monitoring and SLS auditing Inventorying/evaluating tools ping traceroute route flapping ttcp/netperf/tcpblast chariot RIPE TTM/Surveyor NetFlow...

22 QoS monitoring and SLS auditing QoS where? SLS auditing... Application QoS demands... Monitoring network QoS...

23 QoS monitoring and SLS auditing Issues Relation with other groups/activities Aggregated/micro-flow measurements/SLS Granularity/scale needed for SLS auditing Small/large time scale measurements

24 QoS monitoring and SLS auditing More information /nat_infrastruct/perceived.html