1 qos monitoring and sls auditing tequila, amsterdam january 25 th, 2001 victor reijs

1QoS monitoring and SLS auditing

QoS monitoring and SLS auditing

TEQUILA, AmsterdamJanuary 25th, 2001

Victor Reijs


Outline

• Application QoS demands…• Monitoring network QoS…• SLS auditing...


QoS where?

SLS auditing...

ApplicationQoS demands...

Monitoring network QoS...


Application QoS demands

• Some QoS demands are known• To be studied QoS demands...


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...


Literature study

• http://www.heanet.ie/heanet/projects/nat_infrastruct/perceived.html

• Some prilimarly results…


Some prilimarly results: TCP


Some prilimarly results: MPEG-2


Some prilimarly results: Y.1541


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


Determine perceived quality of application

• n-dimensional space• Providing input for debugging:

– application behaviour– network behaviour


QoS where?

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.


QoS where?

SLS auditing...




SLS auditing

• Defining environments…• Gathering reference models…• Freezing definitions…• Inventorying/evaluating tools...• Deliverables...


Defining environments

• Micro flow environmentlooking at applications, end-to-end

• Aggregated environmentPHB


Gathering reference models

• Existing SLS’s• TEQUILA• IETF (IPPM)• Internet2 e2e performance• ...


Freezing definitions

• Freeze reference model and its options• What to measure:

– micro-flow...– aggregated...


Micro flow

• Path and peering points– delay transfer (one way???) and delay

variation– loss rate and error rate– available/peak bandwidth– ...


Aggregated

• Per hop– average load/available bandwidth– loss rate per queue/class– queue length per class

• Path– routing


Inventorying/evaluating tools

• ping• traceroute• route flapping• ttcp/netperf/tcpblast• chariot• RIPE TTM/Surveyor• NetFlow• ...


QoS where?

SLS auditing...




Issues

• Relation with other groups/activities• Aggregated/micro-flow

measurements/SLS• Granularity/scale needed for SLS auditing• Small/large time scale measurements


More information

• http://www.heanet.ie/heanet/projects/nat_infrastruct/perceived.html

• [email protected]

1 qos monitoring and sls auditing tequila, amsterdam january 25 th, 2001 victor reijs

Documents