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Chapter13:MonitoringQualityof
Experience
QualityofExperience(QoE)isanewdashboardwithinNPMthatallowsyouto
monitortrafficonyournetwork.QoEusesPacketAnalysisSensortoprovide
packet-leveltrafficinformationaboutkeydevicesandapplicationsthatyou
specify.
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Chapter13:MonitoringQualityofExperience
BenefitsofQoE
WithQoE,youcan:
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Comparestatisticslikenetworkresponsetime(TCPHandshake)and
applicationresponsetime(TimetoFirstByte)todetermineifaperceived
bottleneckisactuallyonyournetwork,orifyouneedtocalltheserverteam.
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Usedatavolumetrendstopinpointtrafficanomaliesandinvestigatethe
cause.
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Monitor"risky"typesoftraffic.
Therearethreestepsyoumustcompletetostartmonitoringtrafficonyour
network:
1. DeployPacketAnalysisSensors(networkand/orserver)toWindowsnodes
whereyouwanttocollecttrafficdata.
2. Inthewebconsole,specifythenodesandapplicationsforwhichyouwant
tocollecttraffic.
Note:PacketAnalysisSensorsdoesnotautomaticallydiscovernodesand
applications.Youmustindicatethenodesandapplicationstomonitor
beforeyouwillseetrafficdatainthewebconsole.
3. AllocateappropriateCPUcoresandmemoryforthetrafficloadforeach
sensor.
Trafficdataiscapturedusingpacketanalysissensors.Thesesensorscollect
packetsusingeitheradedicatedWindowsSPANorMirrorportmonitorordirectly
onyourWindowsserver.PacketAnalysisSensorscapturepacketsfromthelocal
networkinterface(NIC)andthenanalyzescollectedpacketstocalculatemetrics
forapplicationperformancemonitoring.Thesemetricsprovideinformationabout
applicationhealthandallowyoutoidentifypossibleapplicationperformance
issuesbeforetheyarereportedbyend-users.
Withtheabilitytoanalyzepackettraffic,QoEprovidesrealobservednetwork
responsetime(NRT)andapplicationresponsetime(ART).Inaddition,Packet
AnalysisSensorshavetheabilitytoclassifyandcategorizetrafficforover1000
differentapplicationsbyassociatedpurposeandrisk-level.
FormoreinformationaboutspecificimplementationsofQoE,seeCommon
Packet
Analysis
Sensor
Deployment
Scenarios
.
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SystemRequirements
BeforeyoudeployaPacketAnalysisSensortoadevice,reviewthefollowing
minimumsystemrequirements.
Youwillneedadministrativeprivilegesforeachnodeorswitch.
Sensorscannotbeinstalledon32-bitcomputersanddonotsupport
communicationoverhttps.
NetworkPacketAnalysisSensors(NPAS)
Hardware/Software
Requirements
OS
Windows7orlater,64-bit
WindowsServer2008orlater,64-bit
Note: 32-bitoperatingsystemsarenotsupported.
CPUCores
2CPUCores+1CPUCoreper100Mbps
Harddrivespace
500MB
RAM
1GB+ 1GBper100Mbps
(2GB+1GBper100Mbpsrecommended)
Network
1Gbpsmaximumthroughput
Other
SPAN,mirrorport,orin-linetaponthemonitoredswitch
ServerPacketAnalysisSensors(SPAS)
Hardware/Software
Requirements
OS
Windows7orlater,64-bit
WindowsServer2008orlater,64-bit
Note: 32-bitoperatingsystemsarenotsupported.
CPUCores
2CPUCores+1CPUCoreper100Mbps
Harddrivespace
500MB
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SystemRequirements
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Chapter13:MonitoringQualityofExperience
Hardware/Software
Requirements
RAM
256MB+500MBper100Mbps
(256MBrecommended+500 MBper100Mbps)
Network
1Gbpsmaximumthroughput
PortRequirements
Port#
Protocol
Direction
Description
17778 TCP
Outgoing Usedtosendinformationbacktoyour
SolarWindsserver.
135
TCP
Incoming UsedbyyourSolarWindsservertodeploythe
sensorsandtoapplyupdatestothesensors.
PortMirroringRequirements
WhendeployingaNetworkPacketAnalysisSensor,youmustcreateaSPAN,
mirrorport,orin-linetaponthemonitoredswitch. Forvirtualswitchesyoumay
createpromiscuousportgroupsoravTapinstead.Thisrequiresatleastoneextra
networkinterfacetocollectdatafromthemanagednetworkinterface,aserverto
monitorthecopiedtraffic,andanetworkcabletoconnectthemirroredporttothe
physicalserver.
Pleaseviewyourvendorspecificdocumentationforinstructionsonhowtosetup
portmirroring.Youcancreateportmirrorsforbothphysicalswitchesandvirtual
switches.
ForanexampleofhowtocreateSPAN,seeyourswitch'sdocumentation.
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HowSolarWindsPacketAnalysisSensorsWork
SolarWindsprovidestwotypesofPacketAnalysisSensorstomonitorand
analyzeyournetworktraffic.
l
PacketAnalysisSensorsforNetworks(networksensor)—collectand
analyzepacketdatathatflowthroughasingle,monitoredswitchforupto50
discreteapplicationspernode
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PacketAnalysisSensorforServers(serversensor)—collectandanalyze
packetdataofspecificapplicationsthatflowthroughasinglenode
Afterasensorisdeployedandconfigured,itcapturespacketsandanalyzesthem
tocalculateperformancemetricsforthemonitoredapplications.Anincluded
communicationagentallowsthesensortosendbacksampledpacketdatatothe
Orionserver,whichincludesvolume,transactions,applicationresponsetime,and
networkresponsetimeforeachapplicationonanode.Thepacketdataarethen
savedtotheOriondatabase.TheinformationisusedtopopulateyourQoE
dashboard.Youcanconfigurehowlongyouretainthepacketdatainthe
DatabaseSettingssectionofthePollingSettingsscreen.
NetworkPacketAnalysisSensor(NPAS)
YournetworkadministratormustcreateadedicatedSPAN,mirrorport,
orin-linetapmonitoronthephysicalorvirtualswitchbeforeyoucan
deployorconfigureanetworksensor.
Afteryoudeployandconfigurethenetworksensortothenodemonitoringthe
switch,thesensorcapturesallpacketsthatflowthroughtheswitchandquickly
categorizethepacketsbyapplication.
PacketsthatcorrespondtomonitoredapplicationsareanalyzedforQualityof
Experiencemetrics,suchasresponsetimesortrafficvolume.Dataarethensent
totheOrionserverusingtheSolarWindscommunicationagent.
ServerPacketAnalysisSensor(SPAS)
Aserversensor(SPAS)canmonitor:
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HowSolarWindsPacketAnalysisSensorsWork
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Chapter13:MonitoringQualityofExperience
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apackettrafficonasinglenode.
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upto50applicationspernode.
AdeployedSPAScapturespacketstoandfromthenode.Itidentifiespacketsthat
aresenttoorfromthemonitoredapplicationandanalyzesthemforQualityof
Experiencemetrics,suchasresponsetimeortrafficvolume.Dataarethensentto
theOrionserverusingtheSolarWindscommunicationagent.
LimitationstoPacketAnalysisSensors
Thenumberofnodesyoucanmonitorislimitedbythedatathroughputpernode,
thenumberofcores,andtheamountofRAMavailableonthemonitoringserver.
Usethefollowingtabletoreviewthesensorlimitations.
SensorLimitations
Value
Maximumthroughput(NPASandSPAS)
1Gbps
Maximumnumberofnodespersensor(NPAS)
50nodes
Maximumnumberofnode/applicationpairs
(NPASandSPAS)
50,000pairs
Maximumnumberofsensorsdeployedonyour
network
1,000sensors
Maximumnumberofapplicationspernode/sensor
(NPAS andSPAS)
1,000applicationsper
node
Thesystemrequirementsincreaseforevery100Mbpsoftraffic.
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DeployingPacketAnalysisSensors
CommonPacketAnalysisSensorDeploymentScenarios
AfteryouinstallyourOrionplatformproduct,deploynetworksensorsonaserver
dedicatedtomonitoringanetworkswitch,ordeployserversensorsdirectlyon
physicalorvirtualserversorworkstations.
BasedonhowyouwanttoaggregatethereturnedQoEmetrics,therearethree
maindeploymentscenariospersensortype.
Aggregationlevel
SensorDeployment
Configuration
I haveaccesstomynetwork(NPAS)
Perapplication
DeployanNPAStoaport
mirrorthatmonitorsalltrafficto
andfromtheapplication
Automatic
Persite
DeployanNPAStoaport
mirrorthatmonitorsalltrafficto
andfromthesite
Addasamplingof
endpointstotheNPAS
asmanagednodes
Perclient
DeployanNPAStoaport
mirrorthatmonitorsalltrafficto
andfromthesite
Addallofthe
endpointstotheNPAS
asmanagednodes
Ihaveaccesstomyapplicationservers(SPAS)
Perapplication
DeploytheSPAS directlyon
theapplicationserver
Automatic
Persite
DeploytheSPAStoselect
endpoints
Automatic
Perclient
DeploytheSPAStoall
endpoints
Automatic
Notes: 
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Whendeployingnetworkandserversensorsonthesamenetwork,ensure
thatyoudonotmonitorthesamenodewithmultiplesensors.Thisimpacts
397
DeployingPacketAnalysisSensors
Chapter13:MonitoringQualityofExperience
theQoEmetrics.
l
AllmonitorednodesmustbemanagedbyyourOrionPlatformproduct
beforetheycanbemonitoredbysensors.
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IfthenodeismanagedbyyourSolarWinds Orionserver,applicationsand
nodesaredetectedbydefault.Ifpacketdataisnotcollected,gotoSettings
> QoE Settings> GlobalQoESettings,andactivatetheauto-detect
option.Youcanalsomanuallymonitorapplicationsandmanagednodesor
ignore them.SeeMonitoring
QoE
Applications
andDefining
Nodes
for
a
Network
Sensor
formoreinformation.
Aggregationperapplication
Thisdeploymentscenarioprovidesabroadindicationoftheoverallresponse
timebetweencomputersandthemonitoredapplication.
Aggregationwithaccesstonetwork(NPAS)
398
Notes:
l
Createaportmirror,SPAN,ornetworktapontheswitchwithallthenetwork
traffictoorfromtheapplication.SeeSystem
Requirements
formore
information.
l
YoucanmonitormultipleapplicationsusingthesameNPAS.
Todeploythenetworksensor:
1. ClickSettings>QoESettings>ManageQoEPacket AnalysisSensors
>AddPacketAnalysisSensor.
2. SelecttheNetworkoption,andthenclickAddNodes.
3. Choosethenodewiththeportmirror,SPANornetworktapsetuptomonitor
yournetworkswitch.
4. Assignandtestthecredentialsfortheselectednode.
5. ClickAddNode(s)andDeployAgent(s)todeploythenetworksensorto
thenode.
399
Aggregationwithaccesstonetwork(NPAS)
Chapter13:MonitoringQualityofExperience
Aggregation withaccesstoapplicationservers(SPAS)
TodeployfromyourWebConsole:
1. ClickSettings>QoESettings>ManageQoEPacket AnalysisSensors
> AddPacketAnalysisSensor.
2. SelecttheServeroption,andthenclickAddNodes.
3. Choosethenodeswiththeapplicationyouwanttomonitor.
4. Assignandtestthecredentialsforeachnode.
5. ClickAddNode(s)andDeployAgent(s)todeployanagentonthenode.
400
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