Gig E to desktop

8/7/2019 Gig E to desktop

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2003, Cisco Systems, Inc. All rights reserved.

Networking ProfessionalsOnline TechTalk

Motivations for Gigabit to the Desktop


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Drew PletcherTechnical Marketing Engineer

Ethernet/Switching Technologies Group

Steve ShalitaSenior Manager, Product Marketing

LAN Switching Networking Group


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1998 Today Tomorrow

Backg

round

Java* Applets

Java* Applets

Portals

Smart Agents

Biz Automation Svcs.

Java* Applets

Portals

Compression

Virus Scan

System Management

Back-Up

Authent/EncryptSynchronization

Compression

Virus Scan

System Management

Back-Up

Authent/EncryptSynchronization

Compression

Virus Scan

System Management

Back-Up

Directory Services

Peer-to-Peer Services

Foreground

Multitasking OS

Office* Apps

Passive Browser

Mtasking Net-Aware OS

Net-Aware Office*

Dynamic Browser

E-Mail

Collaboration

Next Generation OS

Net-Integrated Office*

Dynamic Browser

E-Mail

Collaboration

CRM, SCM, ERP Apps

Speech Interface

E-Mail

Client Workload Increasing Dramatically


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Why Gigabit Ethernet to the Desktop

Todays driver for GigabitEthernet to the Desktop is nota single application but thesimultaneous use of multipleapplications

Its not about a singleapplicationits about increasinguser and network productivity

Backup/recovery, large filetransfers and large datatransactions will benefit themost from Gigabit Ethernet

end to end Gig-enabled PCs/Workstations

(LOM)Dell, HP/Compaq,Apple, Sun, many Linuxhardware manufacturers

MS-SQL DB Records

50

100

150

200

250

30%

39%

43%

45%

47%

GbE

10/100

MS-Office Apps

60.29s

36.02s

10/100

GbE

Source: IBM Study November 2002


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True World Traffic Modelingfor Gigabit Ethernet to the Desk

Study of application and traffic patternsof a number of job types in a Fortune and

S&P 500 company

Compute profiles developed by job type

Compute profiles used to model true

traffic patters with client connectivity at10Mbps, 100Mbps and 1000Mbps


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Network Response Improvements10mbps vs. 100mbps vs. 1000mbps

Time in Seconds

849.4

53.7

140

142.2

42.8

85

5.2

35

26.8

4.2

9.8

2.3

17

14.2

0.5

0 100 200 300 400 500 600 700 800 900

1GB Backup

Outlook

Ariba

Clarify

50M File

Transfer 1000

100

10


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Network Response Improvements10mbps vs. 100mbps vs. 1000mbps

186

47

27

0 50 100 150 200

Over All

1000

100

10

Time in Minutes


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Gbe End to End Benefits More than theDesktop

Eliminate Far-End

bottleneck

Reduce wire time, buffercongestion & relieve flow

control mechanisms

Server sessions shorter

Fewer concurrentsessions at server


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Gigabit and QoS

TCP (red) and UDP (green) streams with Gig attached hosts

1GB data using TCP with 0MB Loss

3.7GB data using UDP with 23MB lost

15K of 22.5M datagrams lost154 max consecutive loss


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Enabling QoS in the CampusCongestion Scenario: TCP Traffic Burst + VoIP

SiSi SiSi

SiSiSiSi

Access

Distribution

Core

Location ofPotentialInterface

Congestion

Typical 20:1Data Over-

Subscription

Typical 4:1Data Over-

Subscription

= Data

= Voice


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Maximum Throughput

A B

Delay x BW

RTTTCPWindow

TCP

Window

VS.


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Improving ThroughputTCP Windows

Window Size below RTT x BW/8bitsResults in Low Throughput

RTT

RTT RTT RTTRTT

RTT RTT RTT

A B

Delay x BW

RTTTCPWindow

TCP

Window


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TCP Windows

Windows control the amount of data thatis allowed to be in flight in the network

Maximum throughput is one window fullper round trip time

The sender, receiver, and the network

each determine a different window size RFC 1323TCP for high throughput


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Improving ThroughputTCP Windows

0

50000

100000

150000

200000

250000300000

350000

400000

0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3

10 Mbps

100 Mbps

1 Gbps

Bandwidth Delay Product

WindowSize(By

tes)

RTT (ms)


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TCP Window Size and Throughput

In our tests we initially ran a 32K windowssize, then increased it to 64K, 128K, 256K,300K and finally 1M; the RTT was 3ms

The performance we saw is as follows:

32K 720mbps average

64K 886mbps average

128K 903mbps average300K 936mbps average

1M 941mbps average


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What to Do

Start with default window and buffer sizes

Find out the rtt with ping, compute BDP

Can tune system wide, by application, orautomatically

Check your TCP for high-performancefeatures

Tune TCP values based upon theconfiguration methods specified by theOS or protocol vendor (e.g.. Microsoft,RedHat, Solaris, etc.)


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Implementing Gigabit Ethernetfor Your Organization

Switch-to-SwitchDeploy Gigabit Ethernet switchesin backbone to aggregate wiringclosets

Switch-to-ServerGigabit Ethernet serversconnections

Wiring Closet-to-DesktopNew deployments should be10/100/1000 to enable smooth

migration to Gigabit EthernetGigabit Ethernet for high-performanceusers increases productivity

Upgrade remaining wiring closetswith 10/100/1000 as required

S2


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Phased Deployment

Phase I

Implement Gigabit Ethernet NICs in key servers

Deploy Gigabit Ethernet switches in backbone toaggregate Fast Ethernet switches

Upgrade wiring closet switches to provide GigabitEthernet connectivity to servers, high-need users, orlarge workgroups

Phase II

Gigabit Ethernet on all new desktop purchases

Deploy non-blocking high performance switches/portswhere necessary


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Parallel Deployment Strategy

Any new hardware should be purchased with Gigabitconnectivity!

Servers and switches

Multiple Gigabit connections in all new servers

Upgrade to Gigabit Ethernet NICs in key existing servers

Deploy Gigabit Ethernet switches in backbone to aggregate FastEthernet switches

Desktops and wiring closets

Gigabit Ethernet on all new desktop purchasesUpgrade wiring closet switches to provide Gigabit Ethernetconnectivity to servers, high-need users, or large workgroups

Deploy non-blocking high performance switches in the wiring closetfor all users


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10 Gigabit Ethernetin the Core and for Uplinks

Aggregates GigabitEthernet segments

Scales Enterprise andService Provider LANbackbones

Leverages installed baseof 250 million Ethernetswitch ports

Supports all IP services(data, packetized voiceand video),

Supports metropolitan andwide area networks

Faster and simplerthan other alternatives

S2


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Cabling and Gigabit Ethernet

UTP is the medium of choice forLAN cabling

Category 5 is the original datagrade UTP cable specification

87% of companies haveCategory 5 cabling installed(Sage Research, Inc.)

Focus on cabling standardsfollow TIA recommendations

and investigate variousperformance parameters

Cabling recommendations forGigabit Ethernet deployment


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Cabling Recommendations

Installed Category 5 Cable that meets the definedstandard will support Gigabit Ethernet

Performance defined per TIA/EIA-568B.2

Cabling that does not meet the defined standard may require testingto ensure support of the technology

New installations should specify at least Category 5E withCategory 6 highly recommended

Ensure long-term utility of your cabling

Plan for the future

Use a certified cabling installer

Go to www.gigabitsolution.com

Gigabit Ethernet over CopperCabling White Paper


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Cisco Catalyst LAN SwitchingComprehensive Portfolio

S2

Wiring Closet

Servers

Distribution/Backbone

10/100/100010/100/1000

Scalable, end-to-end intelligent switching

Foundation for converged service deployment

Simple, easy-to-use with consistent softwareand end-to-end management

WAN

Catalyst 6500 Family

Catalyst 4500 Family

CatalystFixed Configuration

2950/2970/3550/3750


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Gigabit Intelligent Campus Network Design

Gigabit EtherChannel

Gigabit EtherChannel10 Gigabit Ethernet

Gigabit Ethernet

10 Gigabit Ethernet

10 Gigabit EtherChannel

CWDMGBIC

QoS Trust-Boundary

Rate-Limiting

Port-Security

ACLs

STP Extensions

Identity (802.1x)

High Availability

Throughput

High Availability

IP Services

Data Center

Internet

Rate-Limiting

ACLs

High Availability

IP Services

STP Extensions

Firewall Services

VPN/IPSec Services

Intrusion Detection

Load Balancing

SSL Offload


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Visit the NetworkingProfessionals Connection

Discussion forums

Online events

Biweekly newsletter

www.cisco.com/discuss/networking


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You Are Listening to

Motivations for Gigabit to the Desktop

Steve ShalitaSenior Manager, Product Marketing

Drew PletcherTechnical Marketing Engineer


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Motivations for Gigabit to the Desktop?

Contact Your LocalCisco Account Representative

Want to Know More about


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This Networking ProfessionalsOnline TechTalk Has Ended

Thank You for Participating


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TIA Cabling Standards Development

Category 5 specified in TIA/EIA-568-A (1995)Performance through 100 MHzTwo Pair Technology

Category 5E specified in TIA/EIA-568-B.2 (2001)Performance through 100 MHzFour Pair Technology

Category 6 specified in TIA/EIA-568-B.2-1 (2002)Performance through 250 MHzFour Pair Technology


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TCP Throughput (window/rtt)

The smallest of three windows determinesthroughput

sbuf, or sender side socket buffers rwin, thereceive window size cwin, TCP congestionwindow

Receive window (rwin) and/or sbuf are still themost common performance limiters

E.g. 8kB window, 87 msec ping time = 753 kbpsE.g. 64kB window, 14 msec rtt = 37 Mbps


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Bandwidth*Delay Product and TCP

TCP needs a receive window (rwin) equalto or greater than the BW*Delay product to

achieve maximum throughput TCP needs sender side socket buffers of

2*BW*Delay to recover from errors

You need to send about 3*BW*Delay bytesfor TCP to reach maximum speed


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Bandwidth*Delay Product

The number of bytes in flight to fill theentire path

Includes data in queues if theycontributed to the delay

Example:100 Mbps path

ping shows a 75 ms rttBDP = 100 * 0.075 = 7.5 million bits(916 KB)

Documents

Gig E to desktop