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Enterasys D-Series CLI Reference 12-1

Port Priority and Rate Limiting Configuration

ThischapterdescribesthePortPriorityandRateLimitingsetofcommandsandhowtousethem.

Port Priority Configuration Summary

TheD‐SeriesdevicesupportsClassofService(CoS),whichallowsyoutoassignmission‐critical

datatohigherprioritythroughthedevicebydelayinglesscriticaltrafficduringperiodsof

congestion.Thehigherprioritytrafficthroughthedeviceisservic edfirstbeforelowerpriority

traffic.TheClassofServicecapability

ofthedeviceisimplementedbyapriorityqueueing

mechanism.ClassofServiceisbasedontheIEEE802.1D(802.1p)standardspecification,and

allowsyoutodefineeightpriorities(0 through 7)andassignthemtotransmitqueuesforeach

port.

Apriority0through7canbesetoneachport,with0being

thelowestpriority.Aportreceivinga

framewithoutpriorityinformationinitstagheaderisassignedapriorityaccordingtothedefault

prioritysettingontheport.Forexample,ifthepriorityofaportissetto4,theframesreceived

throughthatportwithoutapriorityindicated

intheirtagheaderareclassifiedasapriority4and

transmittedaccordingtothatpriority.Inaddition,thedevice’sratelimitingcapabilitiesallowyou

tofurtherprioritizetrafficbyli mitingtherateofinboundtrafficonaperport/prioritybasis.

Configuring Port Priority

Purpose

Tovieworconfigureportprioritycharacteristicsasfollows:

•DisplayorchangetheportdefaultClass‐ofService(CoS)transmitpriority(0through7)of

eachportforframesthatarereceived(ingress)withoutpriorityinformationintheirtag

header.

For information about... Refer to page...

Port Priority Configuration Summary 12-1

Configuring Port Priority 12-1

Configuring Priority to Transmit Queue Mapping 12-4

Configuring Quality of Service (QoS) 12-6

Configuring Port Traffic Rate Limiting 12-10

Note: When CoS override is enabled using the set policy profile command as described in “set

policy profile” on page 11-3, CoS-based classification rules will take precedence over priority

settings configured with the set port priority command described in this section.

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Enterasys D-Series Spezifikationen Seite 349