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Scaling Workgroup Performance With Switching & Fast Ethernet.

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Presentation on theme: "Scaling Workgroup Performance With Switching & Fast Ethernet."— Presentation transcript:

1 Scaling Workgroup Performance With Switching & Fast Ethernet

2 Agenda 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

3 The Need for Speed Rising Desktop Demand Fastermicroprocessors Easy network access More demanding applications

4 Applications Demand More Bandwidth Skier Skier 200K 500K 3,000K PowerPoint File Size

5 Evolving Workgroup Performance with Switching Shared media workgroup Add high speed server connection Add faster client connections Server Repeater Repeater Switch Repeater Switch

6 Selecting Technologies Why Fast Ethernet? It’s Fast!It’s Fast! –Ten times the speed of Ethernet It’s Simple!It’s Simple! –No re-training for MIS and LAN administrators –Runs same applications as today’s 10BASE-T –Uses existing cabling infrastructure –Familiar network management tools It’s Affordable!It’s Affordable! –Less than twice the price of 10Mps Ethernet –No extra or ‘hidden’ costs Fast Ethernet is Ethernet — Only Faster!Fast Ethernet is Ethernet — Only Faster!

7 Evolving Desktop Performance With Switching and Fast Ethernet SharedEthernet Maximum peak bandwidthMaximum peak bandwidth Fast response on large file transfersFast response on large file transfers Ideal for power users using high performance apps such as CAD/CAMIdeal for power users using high performance apps such as CAD/CAM Maximum aggregate bandwidth for continuous loadingMaximum aggregate bandwidth for continuous loading Supports multimedia & VLANs at the desktopSupports multimedia & VLANs at the desktop Ideal for installed base - no desktop changesIdeal for installed base - no desktop changes Shared Fast Ethernet Switched Dedicated Ethernet

8 Bandwidth performance: the facts Shared EthernetShared Ethernet Nominal bandwidth: 10 Mb/sNominal bandwidth: 10 Mb/s Actual bandwidth: 8 Mb/sActual bandwidth: 8 Mb/s Shared media: only one conversation at each timeShared media: only one conversation at each time 8 Mb/s shared among the users8 Mb/s shared among the users 8 Mb/s shared / divided among the users 8 Mb/s shared / divided among the users Mbit/ s

9 Bandwidth performance: the facts Shared Fast EthernetShared Fast Ethernet Nominal bandwidth: 100 Mb/sNominal bandwidth: 100 Mb/s Actual bandwidth: 80 Mb/sActual bandwidth: 80 Mb/s Shared media: only one conversation at each a timeShared media: only one conversation at each a time 80 Mb/s shared / divided among the users 80 Mb/s shared / divided among the users Mbit/ s

10 Bandwidth performance: the facts Switched EthernetSwitched Ethernet Clients on 10 Mb/s portsClients on 10 Mb/s ports One server on a 100 Mb/s portOne server on a 100 Mb/s port Dedicated Ethernet: each client has 10 Mb/s of nominal dedicated bandwidthDedicated Ethernet: each client has 10 Mb/s of nominal dedicated bandwidth Throughput limitation: 80Mb/s on the server linkThroughput limitation: 80Mb/s on the server link Up to 80 Mb/s, 10 Mb/s nominal bandwidth dedicated per user, up to high speed port throughputUp to 80 Mb/s, 10 Mb/s nominal bandwidth dedicated per user, up to high speed port throughput Mbit/ s

11 Bandwidth performance: the facts Switched EthernetSwitched Ethernet Clients on 10 Mb/s portsClients on 10 Mb/s ports Two servers on a 100 Mb/s portTwo servers on a 100 Mb/s port Switched media: several simultaneous conversations at any timeSwitched media: several simultaneous conversations at any time Throughput limitation: 160Mb/s on server linksThroughput limitation: 160Mb/s on server links Up to 160 Mb/s, 10 Mb/s nominal bandwidth dedicated per user, up to high speed port throughput Up to 160 Mb/s, 10 Mb/s nominal bandwidth dedicated per user, up to high speed port throughput Mbit/ s

12 Switched Ethernet or Fast Ethernet? Peak vs. Aggregate Bandwidth Problem: Aggregate Bandwidth Solution: Switching Problem: Peak BandwidthSolution: 100Mbps Workgroup High performance systems with EISA or PCI busHigh performance systems with EISA or 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 networksEliminates server bottlenecks and scalable to large networks Provides sustained dedicated 10 Mbps to desktopProvides sustained dedicated 10 Mbps to desktop Improves peak performance, but end stations need 100-Mbps cardsImproves peak performance, but end stations need 100-Mbps cards Switching further increases aggregate bandwidthSwitching further increases aggregate bandwidth Com 3 ?? ?? Switch 1000 Hub 100

13 Switched Ethernet or Fast Ethernet to the Desktop Fast Ethernet Switched Ethernet ExistingWorkgroups NewWorkgroups Summary Seldom makes senseSeldom makes sense Most existing applications cannot take advantage of 100 MbMost existing applications cannot take advantage of 100 Mb Higher cost - NIC changeHigher cost - NIC change Obvious upgrade path Low costLow cost Leverages existing PCsLeverages existing PCs No cable changeNo cable change Multimedia capableMultimedia capable For power users - peak bandwidth needs Ideal for PCI and EISA PCs, Unix workstationsIdeal for PCI and EISA PCs, Unix workstations Slightly higher costSlightly higher cost Easy migration with 10/100 NICsEasy migration with 10/100 NICs For office automation - aggregate bandwidth, multimedia, video Lower costLower cost Clear choice for ISA PCsClear choice for ISA PCs Peak performance - new PCs and large file transfers Continuous loading - ISA PCs, installed base & new installs with continuous loading Continuous loading - ISA PCs, installed base & new installs with continuous loading

14 Example Applications American University High speed server link cured slow response times and sped up applicationsHigh speed server link cured slow response times and sped up applications Investment in shared Ethernet hubs preservedInvestment in shared Ethernet hubs preserved Able to migrate power users to direct connectionsAble to migrate power users to direct connections Switch Hub Hub

15 Example Applications Imaging at Law Firm Required high performance for imaging applicationsRequired high performance for imaging applications Most effective transition from Token RingMost effective transition from Token Ring Ready for multimedia applications with PACEReady for multimedia applications with PACE “ We understand the cost of every minute. In such a document- intensive profession, this was an easy investment decision.” Switch Fast Ethernet Repeater Router Local Server Imaging Server

16 Internet Example Applications School In Singapore Networking new classroomsNetworking new classrooms –10Mb shared in each room –Servers & backbones on Fast Ethernet –Planning for ATM in the future Switch 1000 Hubs Switch Other classrooms Switch 100Mb fiber links Hub 100 Router Classroom

17 Example Applications Video on Demand to the desktop Switch with PACE enabled Video Servers Router To Internet and School databases ATM switch Engineering SchoolEngineering School –PC in each student room –Desktop Switches PACE enabled for Video on demand to each desktopPACE enabled for Video on demand to each desktop Internet and School databases accessesInternet and School databases accesses VLAN segmentation for network broadcast filteringVLAN segmentation for network broadcast filtering

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