Specifications

SecureStack C3 Configuration Guide 9-1
9
Port Priority Configuration
ThischapterdescribesthePortPrioritysetofcommandsandhowtousethem.
Port Priority Configuration Summary
TheSecureStackC3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.
For information about... Refer to page...
Port Priority Configuration Summary 9-1
Configuring Port Priority 9-2
Configuring Priority to Transmit Queue Mapping 9-5
Configuring Quality of Service (QoS) 9-8
Note: When CoS override is enabled using the set policy profile command as described in “set
policy profile” on page 8-4, CoS-based classification rules will take precedence over priority
settings configured with the set port priority command described in this section.