Performance Adhoc CommitteeIEEE 802.17

Khaled Amer

IEEE 802.17 Plenary Meeting

March 2001

Khaled AmerMarch 2001

Performance of Ring of Ethernet switches IEEE 802.17 - Plenary meeting - Hilton Head

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Agenda• Objectives• Simulation setup and parameters• Results and analysis of various scenarios• Next steps

These are preliminary incomplete resultsof work still in progress

Khaled AmerMarch 2001

Performance of Ring of Ethernet switches IEEE 802.17 - Plenary meeting - Hilton Head

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Objectives

• Investigate the performance characteristics of a ring of Ethernet Switches:– Enable comparing the results with the

performance characteristics of 802.17 RPR solutions

– Quantify areas of strength for 802.17 solutions as compared to Ethernet switches

Khaled AmerMarch 2001

Performance of Ring of Ethernet switches IEEE 802.17 - Plenary meeting - Hilton Head

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Objectives …

• Focus on fairness in:– Bandwidth utilization including

locality fairness– ETE delay

Khaled AmerMarch 2001

Performance of Ring of Ethernet switches IEEE 802.17 - Plenary meeting - Hilton Head

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Methodology

• Follow the methodology that the performance adhoc committee is in the process of defining

• Eliminate parameters of specific switches whenever possible:– Infinite buffers– Huge switching capacity rate

Khaled AmerMarch 2001

Performance of Ring of Ethernet switches IEEE 802.17 - Plenary meeting - Hilton Head

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Simulation setup

• Node count: Ring of 8 nodes • Ring circumference: 100Km• Ring Rate: 10 Gbps• Packet size: 1250 Bytes• Configurations:

– Hubbing – Next hop

Khaled AmerMarch 2001

Performance of Ring of Ethernet switches IEEE 802.17 - Plenary meeting - Hilton Head

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Simulation setup ...

• Low traffic at the beginning to force Spanning Tree Protocol to break the ring at a predictable point

Khaled AmerMarch 2001

Performance of Ring of Ethernet switches IEEE 802.17 - Plenary meeting - Hilton Head

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Switch Parameters

• Generic switch– 10 Gbps ports– Try to eliminate parameters of specific

switches• Store-and-forward• Switch service rate: 10M packets/second

Khaled AmerMarch 2001

Performance of Ring of Ethernet switches IEEE 802.17 - Plenary meeting - Hilton Head

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Metrics

• Throughput– In overload conditions– Per node (for now)

• ETE delay

Khaled AmerMarch 2001

Performance of Ring of Ethernet switches IEEE 802.17 - Plenary meeting - Hilton Head

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Hubbing TopologyScenario I

Khaled AmerMarch 2001

Performance of Ring of Ethernet switches IEEE 802.17 - Plenary meeting - Hilton Head

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Results: Hubbing TopologyScenario I

Khaled AmerMarch 2001

Performance of Ring of Ethernet switches IEEE 802.17 - Plenary meeting - Hilton Head

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Hubbing TopologyScenario II

Khaled AmerMarch 2001

Performance of Ring of Ethernet switches IEEE 802.17 - Plenary meeting - Hilton Head

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Results: Hubbing TopologyScenario II

Khaled AmerMarch 2001

Performance of Ring of Ethernet switches IEEE 802.17 - Plenary meeting - Hilton Head

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Hubbing TopologyScenario III

• Similar to Scenario II except:– Station 2 is sending traffic twice what

Station 1 is sending. • Station 2 is sending 10 Gbps • Station 1 is sending 5 Gbps.

Khaled AmerMarch 2001

Performance of Ring of Ethernet switches IEEE 802.17 - Plenary meeting - Hilton Head

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Results: Hubbing TopologyScenario III

Khaled AmerMarch 2001

Performance of Ring of Ethernet switches IEEE 802.17 - Plenary meeting - Hilton Head

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Hubbing TopologyScenario IV

Khaled AmerMarch 2001

Performance of Ring of Ethernet switches IEEE 802.17 - Plenary meeting - Hilton Head

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Results: Hubbing TopologyScenario IV

Khaled AmerMarch 2001

Performance of Ring of Ethernet switches IEEE 802.17 - Plenary meeting - Hilton Head

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Hubbing Topology Scenario V

Khaled AmerMarch 2001

Performance of Ring of Ethernet switches IEEE 802.17 - Plenary meeting - Hilton Head

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Results: Hubbing TopologyScenario V

Khaled AmerMarch 2001

Performance of Ring of Ethernet switches IEEE 802.17 - Plenary meeting - Hilton Head

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Next Hop TopologyScenario I

Khaled AmerMarch 2001

Performance of Ring of Ethernet switches IEEE 802.17 - Plenary meeting - Hilton Head

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Results: Next Hop TopologyScenario I

Khaled AmerMarch 2001

Performance of Ring of Ethernet switches IEEE 802.17 - Plenary meeting - Hilton Head

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Next Hop TopologyScenario II

• Similar to scenario I except

– Each station generates Poisson traffic at a 1 Gbps rate.

– This was done to insure that none of the links will be overloaded to allow evaluation of end-to-end delay

Khaled AmerMarch 2001

Performance of Ring of Ethernet switches IEEE 802.17 - Plenary meeting - Hilton Head

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Results: Next Hop TopologyScenario II

Khaled AmerMarch 2001

Performance of Ring of Ethernet switches IEEE 802.17 - Plenary meeting - Hilton Head

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Next Hop TopologyScenario III

Khaled AmerMarch 2001

Performance of Ring of Ethernet switches IEEE 802.17 - Plenary meeting - Hilton Head

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Results: Next Hop TopologyScenario III

Khaled AmerMarch 2001

Performance of Ring of Ethernet switches IEEE 802.17 - Plenary meeting - Hilton Head

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Next Hop TopologyScenario IV

Khaled AmerMarch 2001

Performance of Ring of Ethernet switches IEEE 802.17 - Plenary meeting - Hilton Head

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Results: Next Hop TopologyScenario IV

Khaled AmerMarch 2001

Performance of Ring of Ethernet switches IEEE 802.17 - Plenary meeting - Hilton Head

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Conclusions

Khaled AmerMarch 2001

Performance of Ring of Ethernet switches IEEE 802.17 - Plenary meeting - Hilton Head

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What’s Next

• Throughput per flow and per class• More scenarios for next hop and hubbing (?)• Simulations for the random configuration• Packet size distributions (if needed)• More scenarios with various traffic

generation distributions:– Traffic generating nodes move around

Khaled AmerMarch 2001

Performance of Ring of Ethernet switches IEEE 802.17 - Plenary meeting - Hilton Head

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What’s Next ...• Bursty traffic• TCP and UDP apps (and combinations)

– ftp, http, video-conferencing, voice, video streaming

• Multiple rings?• Mesh of rings?• RPR Ring vs. Mesh of switches• Performance behavior when Link fails

Khaled AmerMarch 2001

Performance of Ring of Ethernet switches IEEE 802.17 - Plenary meeting - Hilton Head

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What’s Next ...

• Other metrics:– ETE packet delay dist and fairness– Same analysis for jitter– Packet loss (?)– Congestion control– Fault recovery

Khaled AmerMarch 2001

Performance of Ring of Ethernet switches IEEE 802.17 - Plenary meeting - Hilton Head

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Discussions