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97-0610 Performance Management Requirements of ATM Networks

97-0610 Performance Management Requirements of ATM Networks. Suba Varadarajan, Raj Jain The Ohio State University Aditya Sehgal, Southwestern Bell Communications Contact: jain@cse.ohio-state.edu http://www.cse.ohio-state.edu/~jain/. Why do we need frame level metrics?

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97-0610 Performance Management Requirements of ATM Networks

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  1. 97-0610 Performance Management Requirements of ATM Networks Suba Varadarajan, Raj JainThe Ohio State University Aditya Sehgal, Southwestern Bell Communications Contact: jain@cse.ohio-state.edu http://www.cse.ohio-state.edu/~jain/

  2. Why do we need frame level metrics? • Performance Requirements for: • M4 Network Element View • M4 Network View Overview

  3. Cell Level vs Frame Level • Performance seen by the user  Cell level performanceFor example, CLR = 0.1% may mean a frame loss rate of 0.1% in one switch or 0.001% in another. • Data applications care for frame loss rate and not CLR. • Video applications care for • Frame loss rate • Frame delay variation • Frame transfer delay

  4. Frame Level Performance Management • Shift from cell-level to frame-level performance metrics • Comparison of the performance of ATM with non-ATM networks • ATM Forum Test group is working on frame level performance testing • ATM Forum Traffic Management Group is working on “Guaranteed Frame Rate (GFR)” service

  5. What is a Frame? • Frame = AAL5 Protocol Data Unit • Frame boundary is visible even in ATM layer • Switches are designed to forward/drop complete frames. UserPayload PAD Control Length CRC-32 0-64kB 0-47 2 2 4 0 0 0 0 1 PTI bit indicates End of Frame

  6. Performance Requirements • M4 Network Element View • Cell Level Monitoring • Frame Level Monitoring • M4 Network View

  7. Cell Level Monitoring Requirements • Retrieve current (15 minute) count of cells discarded due to frame discard • Set threshold value • Modify threshold value • Support autonomous notifications of threshold crossing by ATM Network Element • Reset cell count to zero • Retrieve history counts (32 fifteen minute counts) • Mark defective data as ‘suspect’ and permit retrieval

  8. Frame Level Monitoring Requirements • Retrieve current (15 minute) counts of: • a) Frames received on each connection • b) Frames successfully passed on each connection • c) Discarded frames due to UPC/NPC disagreements • d) Discarded frames due to congestion • e) Other discarded frames • f) Successfully passed frames due to UPC/NPC disagreements

  9. Frame Counts Passed Received Queue UPC/NPC Other Other UPC/NPCDisagreements Congestion

  10. Frame Level (Cont) • Set threshold values for • a) Discarded frames due to UPC/NPC disagreements • b) Discarded frames due to congestion • c) Total discarded frames • Modify threshold values for a), b), and c) above • Provide autonomous notifications of threshold crossing by ATM Network Element • Reset all six counts to zero • Retrieve history counts (32 fifteen minute counts) • Mark defective data as ‘suspect’ and permit retrieval

  11. M4 Network View • Support management requests for: • Performance information about entire network • Performance information about specific part of the sub-network

  12. Summary • It is important that performance management include frame level metrics • Addition of cell count and frame counts for M4 Network Element View • M4 Network View requirements

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