H-QOS &Μ-SHAPING BandwidthPerformanceOptimization

2015-3Q

“Client” ProviderNetwork

•Basic•Bandwidth

•Policing“Crush theEdge”

BestEffort Priority/Real-Time

Media/PortSpeed

CIR/LinkSpeedLimit

PacketLossRandomDiscard

BasicQueueNONE

•Hierarchical•µ-Shaping

BandwidthPerformanceOptimization

LowPriorityPacketsSmoothedIntoLinkCapacity

Real-TimePriorityQueue

MaximizedUtilization

Original Smoothed

WITH

2 ©2015ACCEDIANNETWORKS

“Client” ProviderNetwork

  “Establish&EnforcePer-FlowQoS attheServiceEdge”

H-QoSTRAFFICCONDITIONING

•Basic•Bandwidth

•Policing“Crush theEdge”

BestEffort Priority/Real-Time

Media/PortSpeed

CIR/LinkSpeedLimit

PacketLossRandomDiscard

BasicQueueNONE

OriginalTraffic CPEProcessing RemainingAccessLinkTraffic

•Hierarchical•Bandwidth

•PolicingPrioritizedAccess

•LATENCY FREE•PRIORITYFLOWPROCESSING

AccedianPerformance

Element

PrioritizedRightofWay

ParallelPacketProcessing

SharedBandwidthEnvelope(MEF10.3)

MinimizedPacketLoss

WITH

H-QoSQueues

UnusedBandwidth

•Hierarchical•µ-Shaping

BandwidthPerformanceOptimization

LowPriorityPacketsSmoothedIntoLinkCapacity

Real-TimePriorityQueue

MaximizedUtilization

Original Smoothed

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InternetUpload: ResultsreportedbySpeedtest.net

15MbpsConnection 30MbpsConnection

withµ-shaping withµ-shaping

ProviderPolicedOnly ProviderPolicedOnly

µ-SHAPING● INACTION

4 ©2015ACCEDIANNETWORKS

Why?

AccedianPerformanceElement(µ-Shaping)

ProviderNetwork

Client CPE(Policing)

200– 800%MoreThroughputwithAccedianµ-Shaping

DataTrafficis98%+TCP

CBS

2 TCPisBursty• Spikes exceedingCIR=packetslost

• Window length&throughputreduced

• µ-shapinggreatlyreducespacketloss

CIR

• Lengthincreaseswhennopacketslost

Window: framessenttogetheranticipating nopacketloss

length

t

WindowSize&Throughputpacketlossevents

WHY?

1 TCPUsesWindowing• Inefficienttosendaframeandwaitforacknowledgementbeforesending another

• TCPWindow: groupofframessenttogethertoincreasethroughput

• WhenaTCPwindowregistersalostpacket,thetransmitwindowlengthiscutin~1/2

H-QOSTRAFFICCONDITIONING● µ-SHAPINGINACTION

5 ©2015ACCEDIANNETWORKSCompanyConfidential

BANDWIDTHPERFORMANCE● OPTIMIZED

• Preciseupstreamtrafficcontrol• Reducedupstreampacketloss• Reducedqueuelength/delay

  “TheSmoothestµ-Shaping,TransparenttoPriorityFlows”

BLUEAlgorithm

*GbE,256Kb frames=4frames/msec,processing atµs

µsGranularity

• per-frame,1ppmresolution*• tamessub-msmicro-bursts• upto18queues/port

High-AccuracyBandwidthControl

Better FillLessDiscard

Granular

Discard

CoarseInputTraffic

PriorityFlowZero-LatencyQueue

Classifie

r

PriorityBypassmsmicro-

bursts

1

2

3

…

4

N

WithH-QoSRegulated,NoH-QoS

3 H-QoS

1

2

3

…

N

EIR

CIR

1

2

…

N

UNUSEDEIR

UNUSEDCIR

H-QoSBandwidthEnvelop(MEF10.3)

• Multipleflows eachwithCIR,EIRprocessed togethervs.separately

• Unusedbandwidth sharedwithlower-priorityflows

6 ©2015ACCEDIANNETWORKSCompanyConfidential

CustomerLAN

…bandwidth isprecious

…up-linkperformancematters

…retransmitdelaysimpactQoE

…trafficis‘bursty’

…over-commissioning isimpracticalorimpossible

…pushing retransmitsupstreambenefitsnetworkperformance

BANDWIDTHPERFORMANCEOPTIMIZATION

  DataCenterConnectivity

•H-QoSmakesanimpact,where

ReduceDelay

ReduceLoss

IncreaseThrough-

put

TameMicro-Bursts

Off-NetServices

•MobileBackhaul

•BusinessServices

•FinancialNetworks

PROVIDERNETWORK

AAV

RRHs

BBUs

INTERNET

CoreSite

SC-GW/CPE

C-RAN

DataCenterAccedianPerformanceElement(µ--Shaping)

7 ©2015ACCEDIANNETWORKS

LEARNMORE

accedian.com/applications/traffic-conditioning-h-qos