Loading in 5 sec....

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

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

- 85 Views
- Uploaded on

Download Presentation
## PowerPoint Slideshow about ' CS 740: Advance Computer Networks Hand-out on Router Design 02/07/2007' - pennie

**An Image/Link below is provided (as is) to download presentation**

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript

What Limits Router Capacity?

Approximate power consumption per rack

Power density is the limiting factor today

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.

Out

Out

Out

Out

100% throughput for weakly mixing, stochastic traffic

[C.-S. Chang, Valiant]

Two-stage Load-Balancing SwitchR

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

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 SwitchingArray

Waveguide

Router

(AWGR)

Passive andAlmost ZeroPower

A

B

C

D

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 DataflowIn

l1

l1, l2,.., lN

R

R

WDM

lN

1

3

1

1

1

1

2

3

4

1

1

1

1

Download Presentation

Connecting to Server..