Enterasys b5 User Manual

Enterasys B5 CLI Reference 12-1
12
Port Priority Configuration
ThischapterdescribesthePortPrioritysetofcommandsandhowtousethem.Refertothe
“ConfiguringQoS”FeatureGuidefordetailedinformationaboutconfiguringqualityofserviceon
theEnterasysB5.TheEnterasys NetworksfirmwareFeatureGuidesareavailableat:
https://extranet.enterasys.com/downloads/
Port Priority Configuration Summary
TheEnterasysB5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. 
For information about... Refer to page...
Port Priority Configuration Summary 12-1
Configuring Port Priority 12-2
Configuring Priority to Transmit Queue Mapping 12-4
Configuring Quality of Service (QoS) 12-7
Note: When CoS override is enabled using the set policy profile command as described in “set
policy profile” on page 11-4, CoS-based classification rules will take precedence over priority
settings configured with the set port priority command described in this section.

Enterasys b5 Specifications

General

Brand	Enterasys
Model	b5
Category	Other
Language	English