1QoS monitoring and SLS auditing

QoS monitoring and SLS auditing

TEQUILA, AmsterdamJanuary 25th, 2001

Victor Reijs

2QoS monitoring and SLS auditing

Outline

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

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QoS where?

SLS auditing...

ApplicationQoS demands...

Monitoring network QoS...

4QoS monitoring and SLS auditing

Application QoS demands

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

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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...

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Literature study

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

• Some prilimarly results…

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Some prilimarly results: TCP

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Some prilimarly results: MPEG-2

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Some prilimarly results: Y.1541

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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

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Determine perceived quality of application

• n-dimensional space• Providing input for debugging:

– application behaviour– network behaviour

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QoS where?

SLS auditing...

ApplicationQoS demands...

Monitoring network QoS...

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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.

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QoS where?

SLS auditing...

ApplicationQoS demands...

Monitoring network QoS...

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SLS auditing

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

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Defining environments

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

• Aggregated environmentPHB

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Gathering reference models

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

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Freezing definitions

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

– micro-flow...– aggregated...

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Micro flow

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

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

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Aggregated

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

• Path– routing

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Inventorying/evaluating tools

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

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QoS where?

SLS auditing...

ApplicationQoS demands...

Monitoring network QoS...

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Issues

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

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

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More information

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

• victor.reijs@heanet.ie