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CS 740: Advance Computer Networks Hand-out on Router Design 02/07/2007

CS 740: Advance Computer Networks Hand-out on Router Design 02/07/2007. ISLIP Scheduling Example. ISLIP (cont.). What Limits Router Capacity?. Approximate power consumption per rack. Power density is the limiting factor today. Crossbar. Linecards. Switch. Linecards.

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CS 740: Advance Computer Networks Hand-out on Router Design 02/07/2007

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  1. CS 740: Advance Computer Networks Hand-out on Router Design 02/07/2007

  2. ISLIP Scheduling Example

  3. ISLIP (cont.)

  4. What Limits Router Capacity? Approximate power consumption per rack Power density is the limiting factor today

  5. Crossbar Linecards Switch Linecards Multi-rack Routers Reduce Power Density

  6. Question • Instead, can we use an optical fabric at 100Tb/s with 100% throughput? • Conventional answer: No • Need to reconfigure switch too often • 100% throughput requires complex electronic scheduler.

  7. R R/N R/N Out R/N R R/N R R R/N R/N Out R/N R R/N R/N Out If Traffic is Uniform… R In R In R In

  8. Out Out Out Out Out 100% throughput for weakly mixing, stochastic traffic [C.-S. Chang, Valiant] Two-stage Load-Balancing Switch R R R R/N R/N In Out R/N R/N R/N R/N R/N R/N R R R In R/N R/N R/N R/N R/N R/N R R R R/N R/N In R/N R/N Load-balancing stage Switching stage

  9. Out Out Out R R In R/N R/N 1 R/N R/N 3 R/N R/N R/N R/N R R In 2 R/N R/N 3 R/N R/N R/N R/N R/N R R R/N In 3 R/N R/N 3

  10. A, A, A, A A, B, C, D B, B, B, B A, B, C, D C, C, C, C A, B, C, D D, D, D, D A, B, C, D 4 WDM channels, each at rate 2R/N In In In In Out Out Out Out Static WDM Switching Array Waveguide Router (AWGR) Passive andAlmost ZeroPower A B C D

  11. 2 2 2 2 2 2 l1 R l1, l2,.., lN WDM lN R l1 l1, l2,.., lN R R WDM 2 lN Out l1 R l1, l2,.., lN R 1 1 1 1 WDM lN 100 Tb/s router: Linecard Dataflow In l1 l1, l2,.., lN R R WDM lN 1 3 1 1 1 1 2 3 4 1 1 1 1

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