Scaling Workgroup Scaling Workgroup PerformancePerformance

With Switching & With Switching & Fast EthernetFast Ethernet

AgendaAgenda

• The need for speedThe need for speed

• Scaling workgroup performanceScaling workgroup performance

• Bandwidth performance: the factsBandwidth performance: the facts

• Peak bandwith versus aggregate bandwidthPeak bandwith versus aggregate bandwidth

• Example of applicationsExample of applications

The Need for SpeedThe Need for SpeedRising Desktop DemandRising Desktop Demand

FasterFastermicroprocessorsmicroprocessors

Easy network Easy network accessaccess

More More demanding applicationsdemanding applications

Applications DemandApplications DemandMore BandwidthMore Bandwidth

• SkierSkier200K200K

500K500K

3,000K3,000K

19971997 19981998 19991999

PowerPoint File SizePowerPoint File Size

Evolving WorkgroupEvolving WorkgroupPerformance with SwitchingPerformance with Switching

Shared mediaShared mediaworkgroupworkgroup

Add high speedAdd high speedserver connectionserver connection

Add fasterAdd fasterclient connectionsclient connections

ServerServer

RepeaterRepeater

RepeaterRepeater

SwitchSwitch

RepeaterRepeater

SwitchSwitch

Selecting TechnologiesSelecting TechnologiesWhy Fast Ethernet?Why Fast Ethernet?

• It’s It’s FastFast!!– Ten times the speed of EthernetTen times the speed of Ethernet

• It’s It’s SimpleSimple!!– No re-training for MIS and LAN administratorsNo re-training for MIS and LAN administrators– Runs same applications as today’s 10BASE-TRuns same applications as today’s 10BASE-T– Uses existing cabling infrastructureUses existing cabling infrastructure– Familiar network management toolsFamiliar network management tools

• It’s It’s AffordableAffordable!!– Less than twice the price of 10Mps EthernetLess than twice the price of 10Mps Ethernet– No extra or ‘hidden’ costsNo extra or ‘hidden’ costs

• Fast Ethernet Fast Ethernet isis Ethernet — Only Faster! Ethernet — Only Faster!

Evolving Desktop PerformanceEvolving Desktop PerformanceWith Switching and Fast EthernetWith Switching and Fast Ethernet

SharedSharedEthernetEthernet

• Maximum peak bandwidthMaximum peak bandwidth

• Fast response on large Fast response on large file transfersfile transfers

• Ideal for power users using Ideal for power users using high performance apps high performance apps such as CAD/CAMsuch as CAD/CAM

• Maximum aggregate Maximum aggregate bandwidth for continuous bandwidth for continuous loadingloading

• Supports multimedia & Supports multimedia & VLANs at the desktopVLANs at the desktop

• Ideal for installed base - Ideal for installed base - no desktop changesno desktop changes

SharedSharedFast EthernetFast Ethernet

SwitchedSwitchedDedicated EthernetDedicated Ethernet

Bandwidth performance: the factsBandwidth performance: the facts

Aggregate Throughput

0

20

40

60

80

100

120

140

160

2 4 6 8 12 16 20 24

Number of clients connected

Switched Ethernet -2 servers

Switched Ethernet -1 serverShared FastEthernet

Shared Ethernet

• Shared EthernetShared Ethernet

• Nominal bandwidth:Nominal bandwidth:10 Mb/s10 Mb/s

• Actual bandwidth:Actual bandwidth:8 Mb/s8 Mb/s

• Shared media:Shared media:only one conversation only one conversation at each timeat each time

• 8 Mb/s shared among the users 8 Mb/s shared among the users

• 8 Mb/s shared / divided among the users8 Mb/s shared / divided among the users

Mbit/ s

Bandwidth performance: the factsBandwidth performance: the facts

Aggregate Throughput

0

20

40

60

80

100

120

140

160

2 4 6 8 12 16 20 24

Number of clients connected

Switched Ethernet -2 servers

Switched Ethernet -1 serverShared FastEthernet

Shared Ethernet

• Shared Fast EthernetShared Fast Ethernet

• Nominal bandwidth:Nominal bandwidth:100 Mb/s100 Mb/s

• Actual bandwidth:Actual bandwidth:80 Mb/s80 Mb/s

• Shared media:Shared media:only one conversation only one conversation at each a time at each a time

• 80 Mb/s shared / divided among the users80 Mb/s shared / divided among the users

Mbit/ s

Bandwidth performance: the factsBandwidth performance: the facts

Aggregate Throughput

0

20

40

60

80

100

120

140

160

2 4 6 8 12 16 20 24

Number of clients connected

Switched Ethernet -2 servers

Switched Ethernet -1 serverShared FastEthernet

Shared Ethernet

• Switched EthernetSwitched Ethernet

• Clients on Clients on 10 Mb/s ports10 Mb/s ports

• One server on One server on a 100 Mb/s porta 100 Mb/s port

• Dedicated Ethernet:Dedicated Ethernet:each client has each client has 10 Mb/s of nominal dedicated 10 Mb/s of nominal dedicated bandwidth bandwidth

• Throughput limitation:Throughput limitation:80Mb/s on the server link80Mb/s on the server link

•Up to 80 Mb/s, Up to 80 Mb/s, 10 Mb/s nominal bandwidth dedicated per user, up to high speed port throughput 10 Mb/s nominal bandwidth dedicated per user, up to high speed port throughput

Mbit/ s

Bandwidth performance: the factsBandwidth performance: the facts

Aggregate Throughput

0

20

40

60

80

100

120

140

160

2 4 6 8 12 16 20 24

Number of clients connected

Switched Ethernet -2 servers

Switched Ethernet -1 serverShared FastEthernet

Shared Ethernet

• Switched EthernetSwitched Ethernet

• Clients on Clients on 10 Mb/s ports10 Mb/s ports

• Two servers on Two servers on a 100 Mb/s porta 100 Mb/s port

• Switched media:Switched media:several simultaneous conversations several simultaneous conversations

at any timeat any time

• Throughput limitation:Throughput limitation:160Mb/s on server links160Mb/s on server links

• Up to 160 Mb/s, Up to 160 Mb/s, 10 Mb/s nominal bandwidth dedicated per user, up to high speed port throughput 10 Mb/s nominal bandwidth dedicated per user, up to high speed port throughput

Mbit/ s

Switched Ethernet or Fast Switched Ethernet or Fast Ethernet?Ethernet?Peak vs. Aggregate BandwidthPeak vs. Aggregate Bandwidth

Problem: Aggregate Bandwidth Solution: 10-100 Switching

Problem: Peak Bandwidth Solution: 100Mbps Workgroup

• High performance systems with EISA High performance systems with EISA or PCI busor PCI bus

• Slow response on large file transfersSlow response on large file transfers• Bursty trafficBursty traffic

• Large workgroupLarge workgroup• ISA, MCA, PCI or EISAISA, MCA, PCI or EISA• Continuous loadingContinuous loading• Excessive collisionsExcessive collisions

• Eliminates server bottlenecks and scalable to large Eliminates server bottlenecks and scalable to large networksnetworks

• Provides sustained dedicated 10 Mbps to desktopProvides sustained dedicated 10 Mbps to desktop

• Improves peak performance, but Improves peak performance, but end stations need 100-Mbps cardsend stations need 100-Mbps cards

• Switching further increases Switching further increases aggregate bandwidthaggregate bandwidth

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Switch 1000Switch 1000

Hub 100Hub 100

Switched Ethernet or Fast Ethernet Switched Ethernet or Fast Ethernet to the Desktopto the Desktop

Fast EthernetFast Ethernet Switched EthernetSwitched Ethernet

ExistingExistingWorkgroupsWorkgroups

New New WorkgroupsWorkgroups

SummarySummary

• Seldom makes senseSeldom makes sense

• Most existing applications cannot Most existing applications cannot take advantage of 100 Mbtake advantage of 100 Mb

• Higher cost - NIC changeHigher cost - NIC change

Obvious upgrade pathObvious upgrade path• Low costLow cost• Leverages existing PCsLeverages existing PCs• No cable changeNo cable change• Multimedia capableMultimedia capable

For power users - peak For power users - peak bandwidth needsbandwidth needs

• Ideal for PCI and EISA PCs, Ideal for PCI and EISA PCs, Unix workstationsUnix workstations

• Slightly higher costSlightly higher cost• Easy migration with Easy migration with

10/100 NICs10/100 NICs

For office automation - For office automation - aggregate bandwidth,aggregate bandwidth,multimedia, videomultimedia, video

• Lower costLower cost• Clear choice for ISA PCsClear choice for ISA PCs

Peak performance - new PCs Peak performance - new PCs and large file transfersand large file transfers

Continuous loading - ISA Continuous loading - ISA PCs, installed base & new PCs, installed base & new installs with continuous installs with continuous loadingloading

Example ApplicationsExample ApplicationsAmerican UniversityAmerican University

• High speed server link cured High speed server link cured slow response times and sped slow response times and sped up applicationsup applications

• Investment in shared Ethernet Investment in shared Ethernet hubs preservedhubs preserved

• Able to migrate power users to Able to migrate power users to direct connectionsdirect connections

Switch Switch

HubHub

Example ApplicationsExample ApplicationsImaging at Law FirmImaging at Law Firm

• Required high Required high performance forperformance forimaging applicationsimaging applications

• Most effective transition Most effective transition from Token Ringfrom Token Ring

• Ready for multimedia Ready for multimedia applications with PACEapplications with PACE

“ “ We understand the We understand the cost of every minute. cost of every minute. In such a document-In such a document-intensive profession, intensive profession, this was an easy this was an easy investment decision.”investment decision.”

SwitchSwitch

Fast Ethernet RepeaterFast Ethernet Repeater

RouterRouter

Local ServerLocal Server

Imaging ServerImaging Server

ComCom33

InternetInternet

Example ApplicationsExample ApplicationsSchool In SingaporeSchool In Singapore

• Networking new classroomsNetworking new classrooms– 10Mb shared in each room10Mb shared in each room– Servers & backbones on Fast Servers & backbones on Fast

EthernetEthernet– Planning for ATM in the futurePlanning for ATM in the future

Switch 1000Switch 1000

HubsHubs

SwitchSwitch

Other classroomsOther classrooms

SwitchSwitch

100Mb fiber100Mb fiberlinkslinks

Hub 100Hub 100

RouterRouter

ClassroomClassroom

Example Applications Example Applications Video on Demand to the desktop Video on Demand to the desktop

Switch Switch with PACE with PACE

enabledenabledVideo Video ServersServers

RouterRouter

To Internet and School databasesTo Internet and School databases

ATM switchATM switch

• Engineering SchoolEngineering School– PC in each student roomPC in each student room– Desktop SwitchesDesktop Switches

• PACE enabled for Video on PACE enabled for Video on demand to each desktop demand to each desktop

• Internet and School Internet and School databases accessesdatabases accesses

• VLAN segmentation for VLAN segmentation for network broadcast filteringnetwork broadcast filtering

TelsysTelsys