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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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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

Multi-rack Routers Reduce Power Density


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.


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


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


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


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


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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