Lenovo Flex System Fabric CN4093 User Manual

© Copyright Lenovo 2017 215
Chapter 12. Quality of Service
QualityofService(QoS)featuresallowyoutoallocatenetworkresourcesto
mission‐criticalapplicationsattheexpenseofapplicationsthatarelesssensitiveto
suchfactors astimedelaysornetworkcongestion.Youcanconfigureyournetwork
toprioritizespecifictypesoftraffic,ensuringthateachtypereceivesthe
appropriate
QoSlevel.
Thefollowingtopicsarediscussedinthissection:
 “QoSOverview”onpage 21 5
 “UsingACLFilters”onpage 217
 “UsingDSCPValuestoProvideQoS”onpage 219
 “Using802.1pPriori tiestoProvideQoS”onpage 224
 “QueuingandScheduling”onpage 225
QoS Overview
QoShelpsyouallocateguaranteedbandwidthtocriticalapplications,andlimit
bandwidthforlesscriticalapplications.Applicationssuchasvideoandvoicemust
haveacertainamountofbandwidthtoworkcorrectly;using QoS,youcanprovide
thatbandwidthwhennecessary.Also,youcanputahighpriorityonapplications 
that
aresensitivetotimingoutorthosethatcannottoleratedelay,assigningthat
traffictoahigh‐priorityqueue.
ByassigningQoSlevelstotrafficflowsonyournetwork,youcanensurethat
networkresourcesareallocatedwheretheyareneededmost.QoSfeaturesallow
youtoprioritizenetworktraffic,thereby
providingbetterserviceforselected
applications.
Figure 22onpage 215showsthebasicQoSmodelusedbytheCN409310Gb
ConvergedScalableSwitch.
Figure 22. QoSModel
TheCN4093usestheDifferentiatedServices(Di ffServ)architecturetoprovideQoS
functions.DiffServisdescribedinIETFRFC2474andRFC2475.
WithDiffServ,youcanestablish
policiesfordirecting traffic.Apolicyisa
traffic‐controllingmechanismthatmonitorsthecharacteristicsofthetraffic(for
example,itssource,destination,andprotocol)andperformsacontrollingactionon
thetrafficwhencertaincharacteristicsarematched.
Ports
ACL
Filter
ACL
Meter
Drop/Pass/
Re-Mark
Classify
Packets
Perform
Actions
Egress
Ingress
COS
Queue
Meter
Traffic
Queue and
Schedule

Lenovo Flex System Fabric CN4093 Specifications

General

Brand	Lenovo
Model	Flex System Fabric CN4093
Category	Switch
Language	English