1 / 24

Gigabit Ethernet vs. ATM

Gigabit Ethernet vs. ATM. Why Gigabit Ethernet?. Primary Drivers. Conventional Wisdom - 1994. Conventional Wisdom – now!. Conventional Wisdom – 1994. Conventional Wisdom – now!. Is GbE Ethernet all over again?. Yes!!! A Thousand Times Yes. Same frames Same Knowledge Same Infrastructure

oliveyoung
Télécharger la présentation

Gigabit Ethernet vs. ATM

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. Gigabit Ethernet vs. ATM

  2. Why Gigabit Ethernet? K. Salah

  3. Primary Drivers K. Salah

  4. Conventional Wisdom - 1994 K. Salah

  5. Conventional Wisdom – now! K. Salah

  6. Conventional Wisdom – 1994 K. Salah

  7. Conventional Wisdom – now! K. Salah

  8. Is GbE Ethernet all over again? • Yes!!! A Thousand Times Yes. • Same frames • Same Knowledge • Same Infrastructure • Multiple vendor support • Low cost, interoperable • Simple, easy migration • Same network management philosophy • Very few new things to learn • Just the next step in Ethernet K. Salah

  9. Scalability of Ethernet K. Salah

  10. All Other Ethernet Ethernet Traffic Dominance • Why Ethernet traffic at 80+%? • Installed base • Low-cost desktop connections • Low-cost server connections • Scalability 10/100/1000 • Smooth migration • Network reliability • Network management tools and techniques 100% 80% 60% 40% 20% 0% NICs 1997 Shipments and 1997 Installed Base K. Salah

  11. How about QoS? • ATM wins, but wait! • You need ATM all the way to the desktop • Most of LAN traffic is IP • With 1GbE PC-to-Switch, you have 2G bps BW to run any delay sensitive traffic. • MPLS, RSVP, and 802.1p are narrowing the QoS gap. K. Salah

  12. K. Salah

  13. Jumbo Frames • Payload is much bigger than 1500 bytes • Minimize overhead at hosts and saves bandwidth in links • Can go up to 9000 bytes • Super Jumbo frames can go to up to 64000 bytes • As big as the MTU • No fragmentation needed • Memory buffer at nodes is a major problem. K. Salah

  14. K. Salah

  15. GbE Topology Alternatives Connection Applications Topology Modes Media Objective • High throughput • Long distance • Full duplex • Half duplex • Multimode • Singlemode • Copper • Campus backbone • Building backbone • Wiring closet uplinks • Servers Switched • Low cost • Short distance • Half duplex • “Classic repeater” • Multimode • Copper • Servers • Desktops (long-term) Shared • Low cost • Long distance • Full duplex • “Buffered distributor” • Multimode • Copper • Servers • Desktops (long-term) K. Salah

  16. Cabling Support 1000 Mbps MAC (Media Access Control) 802.3z CSMA/CD Ethernet 1000BaseLX (1300 nm) MMF 550m SMF 3 km 1000BaseSX (780–850 nm) MMF 220–500m 1000BaseCX Copper Balanced Shielded Cable 25m 1000BaseT Copper Category 5 UTP 100m IEEE 802.3ab IEEE 802.3z Gigabit Interface Cards (GBICs) K. Salah

  17. 802.3z and 802.3ab Physical Media { 9u Singlemode 1000BaseLX ~1300 nm 50u Multimode Long Reach Lasers: 15 to 60 km 62.5u Multimode { 1000BaseSX ~850 nm 50u Multimode 62.5u Multimode “Long-Haul Copper” (802.3ab) { 4 pr Cat 5 UTP Balanced Shielded Cable { 1000BaseCX Copper // 100m 220m 550m 500m 25m 5 km Wiring Closet Machine Room Building Backbones Campus Backbone K. Salah

  18. GbE and Distance K. Salah

  19. 10 GbE • Standard out in 2002 • 10 Gigabit Ethernet supports only full duplex links which can be connected by switches. • Half duplex operation and CSMA/CD (carrier sense multiple access with collision detect) are not supported in 10GbE. • As of 2008, 10 Gigabit Ethernet is still an emerging technology with only 1 million ports shipped in 2007 K. Salah

  20. Deployment of 10 GbE • LAN: • both service provider and enterprise • MAN: • both dark fiber and DWDM • WAN: • Attachment to WAN access equipment at edge of OC- 192 infrastructure K. Salah

  21. K. Salah

  22. K. Salah

  23. K. Salah

  24. 100 GbE • presently under early development by the IEEE. • The fastest existing standard is 10 gigabit Ethernet. • In late November 2006, an IEEE study group agreed to target 100 Gbit/s Ethernet as the next version of the technology. • Support at least 10 km on SMF • Support at least 40 km on SMF (1550 nm wavelength) • Support full-duplex operation only • Preserve the 802.3 / Ethernet frame format at the MAC Client service interface • In February 2008, Opnext Inc. and Hitachi Ltd. demonstrated the first lasers to support this new high-speed standard. K. Salah

More Related