Enterasys Enterasys SecureStack B2 B2G124-24 Dokumentacja Pobierz pdf (Strona 377)

SecureStack B2 Configuration Guide 13-1

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SecureStackB2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serviced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 13-1

Configuring Port Priority 13-1

Configuring Priority to Transmit Queue Mapping 13-4

Configuring Quality of Service (QoS) 13-6

Configuring Port Traffic Rate Limiting 13-10

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

policy profile” on page 12-3, 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 Enterasys SecureStack B2 B2G124-24 Dokumentacja Strona 377