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An Alternative Edge Behavior for PCN-Based Admission Control and Flow Termination

An Alternative Edge Behavior for PCN-Based Admission Control and Flow Termination. Michael Menth. Outline. Motivation Assumptions Admission control using PCN-marked signaling Regular check termination Conclusion. Motivation. Why another edge behavior?

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An Alternative Edge Behavior for PCN-Based Admission Control and Flow Termination

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  1. An Alternative Edge Behavior for PCN-Based Admission Control and Flow Termination Michael Menth

  2. Outline • Motivation • Assumptions • Admission control using PCN-marked signaling • Regular check termination • Conclusion Michael Menth – An Alternative Edge Behavior for PCN-Based Admission Control and Flow Termination

  3. Motivation • Why another edge behavior? • CL does not work with legacy tunnels, requires RFC6040 • SM requires significant traffic per ingress-egress-aggregate to work well • Both require additional signaling protocols • Both require ingress-egress-aggregates • Not defined how to realize them in different environments • Therefore, not clear how measurements can be performed • Both have problems with multipath routing Michael Menth – An Alternative Edge Behavior for PCN-Based Admission Control and Flow Termination

  4. Assumptions • Marking behavior: same as in CL • Threshold-marking configured with PCN-admissible-rate • Excess-traffic-marking configured with PCN-supportable-rate • PCN encoding • Packet-specific dual marking (PSDM), works with legacy tunnels • Alternative: 3-in-1 encoding, requires RFC6040 • Path-coupled end-to-end signaling AC & FT decisionpoint Data End-to-end signalling Michael Menth – An Alternative Edge Behavior for PCN-Based Admission Control and Flow Termination

  5. Admission ControlUsing PCN-MarkedSignalling • http://tools.ietf.org/html/draft-menth-pcn-marked-signaling-ac(co-author Ruediger Geib) • http://atlas2.informatik.uni-tuebingen.de/menth/papers/Menth08-Sub-8.pdf • Initial PATH messagegetsmarked (PM, ThM, ETM): block flow! • Initial PATH messageremains not-marked (NM): admitflow! AC & FT decisionpoint PATH PATH_TEAR AC & FT decisionpoint PATH RESV Michael Menth – An Alternative Edge Behavior for PCN-Based Admission Control and Flow Termination

  6. Regular Check Termination – Mechanism • https://atlas2.informatik.uni-tuebingen.de/menth/papers/Menth10-Sub-8.pdf(ideasupportedby Ruediger Geib) • Egressnode • Remembersmarkingofmostrecent packet foreachadmittedflow • Checks everyflow in periodicintervalsandsends RESV_TEAR ifmostrecent packet was marked Flow 0 Flow 1 Flow 2 Most recentpackets  Terminateflow 1! Michael Menth – An Alternative Edge Behavior for PCN-Based Admission Control and Flow Termination

  7. Regular Check Termination – Performance • Regular check interval • : Flow terminationdelayfor PCN domain • Termination behaviorindependentof packet inter-arrival time & packet size • Fast termination • Even in thepresenceof packet loss • Does not needpreferential packet drops • Works withpreferentialdroppingofmarkedpackets Michael Menth – An Alternative Edge Behavior for PCN-Based Admission Control and Flow Termination

  8. Conclusion • Proposed AC and FT method independent of each other • Only new “PCN-marked signaling” AC may be used in CL-like environment • Only new “regular check” FT may be used in CL-like environment • Advantage of combination • No need for RFC6040 compliance • No need for additional PCN signaling protocol • No need for ingress-egress-aggregates • What to do with • PSDM encoding (WG document)? • Admission control based on PCN-marked signaling? • Regular check termination? • Options • Who supports ideas? • One or several informational docs? • If PCN is closed, may be finished in TSVWG Michael Menth – An Alternative Edge Behavior for PCN-Based Admission Control and Flow Termination

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