1 / 11

The Limits of Switch Bandwidth

The Limits of Switch Bandwidth. Scott Kipp February 28, 2011. Increasing Bandwidth. Switch designs are limited by: ASICS that are getting faster with process improvements 45 nm processes can support 25Gbps lanes Backplanes and connectors are getting faster and support 25 Gbps

roana
Télécharger la présentation

The Limits of Switch Bandwidth

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. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. The Limits of Switch Bandwidth Scott Kipp February 28, 2011

  2. Increasing Bandwidth • Switch designs are limited by: • ASICS that are getting faster with process improvements • 45 nm processes can support 25Gbps lanes • Backplanes and connectors are getting faster and support 25 Gbps • FR4 will probably need to be replaced with Nelco13 • Front panel is set by 19” rack width and limits the port count • The height is optimized on 1.75” (1RU) increments and is a differentiator • Power of blade – optics usually only dissipate 50W of power max • Higher speed designs will need new optical module and electrical interface standards • 25-28 Gbps electrical signals is needed to increase the bandwidth of the switch

  3. 10GbE ASIC and Module Design XENPAK XPAK XFP 300 Pin MSA SFP+ X2 QSFP – 4 lanes of 10GbE

  4. 100GbE ASIC and Module Design Under Development By CFP MSA CXP CXP2? QSFP+ CFP4 CFP CFP2

  5. Switch Design • Switches are typically designed for a 19” rack and this allows about 16-17” of port space for ports • Highest densities so far are 64 mini SFP+ (mSFP) ports at 10GE or 48 SFP+ and 4 QSFP ports • Blades inserted horizontally or vertically Modular Switch with 48 SFP+ ports Modular Switch with 64 mSFP+ ports 1U Switch

  6. Switch Designs with 10Gbps interfaces 48 SFP+ Design - 480 Gbps of throughput, 48 Watts* of power Limited by size of SFP+ with 15mm pitch 4 CFP Design - 400 Gbps of throughput, 60 Watts** of power Limited by ASICs now, but soon limited by size of CFP Port with 84mm pitch CFP CFP CFP CFP 40 QSFP+ Design - 1600 Gbps of throughput, 80 Watts*** of power Limited by ASICs now, size of QSFP+ with 21mm pitch 32 CXP Design - 3200 Gbps of throughput, 80 Watts**** of power Limited by ASICs, CXP has 27mm pitch *Based on 1 Watt of power/SFP per SFF-8431 *** Based on 2 Watts of power/QSFP+ **Based on 15 Watts/CFP for 10km links ****Based on 2.5 Watts of power / CXP

  7. Summary of 10 Gbps Switch Designs • Support of single-mode applications requires larger modules because of higher power dissipation • Multimode modules support less power and are denser

  8. Switch Designs with 25-28 Gbps interfaces 48 SFP+ Design - 1.3 Tbps of throughput at 32GFC, 48 Watts* of power Limited by size of SFP+ with 15mm pitch 8 CFP2 Design - 800 Gbps of throughput, 96 Watts** of power Limited by ASICs now, but soon limited by size of CFP2 Port with 42mm pitch CFP2 CFP2 CFP2 CFP2 CFP2 CFP2 CFP2 CFP2 40 QSFP+ Design - 4 Tbpsof throughput, 80 Watts*** of power Limited by ASICs and power, QSFP+ pitch is 21mm 16 CFP4 Design - 1.6Tbpsof throughput, 96Watts**** of power Limited by ASICs, CXP pitch is 27mm *Based on 1 Watt of power/SFP per SFF-8431 **Based on 12 Watts/CFP2 for 10km links ***Based on 2 Watt of power/QSFP ****Based on 6Watts/CFP2 for 10km links

  9. Summary of 25Gbps Switch Designs • Support of single-mode applications requires larger modules because of higher power dissipation • Multimode modules support less power and are denser

  10. Tbps Bandwidths require faster speeds • 10Gbps lanes will limit the throughput of the switch/blade in the next few years • Difficult to expand beyond 128 ports / ASIC • Module size limits bandwidth and causes long trace lengths • In the next few years, 25-28Gbps signaling needed to support Tbps switch/blade bandwidths • 4X25Gbps easier to support than 10X10Gbps in near future • Cost of 25-28G signaling compared to 10Gbps will be an interesting battle in the next few years • Terabit Ethernet will require major innovation • 100x10G or 40x25G not practical for pluggable modules • 10X100G not practical from signaling perspective

  11. Thank You

More Related