Enterasys SecureStack C2

SecureStack C2 Configuration Guide 10-1
10
Port Priority and Rate Limiting Configuration
ThischapterdescribesthePortPri orityandRateLimitingsetofcommandsandhowtousethem.
Port Priority Configuration Summary
TheSecureStackC2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limiting
therateofinboundtrafficonaperport/prioritybasis.
Configuring Port Priority
Purpose
Tovieworconfigureportprioritycharacte risticsasfollows:
For information about... Refer to page...
Port Priority Configuration Summary 10-1
Configuring Port Priority 10-1
Configuring Priority to Transmit Queue Mapping 10-4
Configuring Quality of Service (QoS) 10-6
Configuring Port Traffic Rate Limiting 10-9
Note: When CoS override is enabled using the set policy profile command as described in “set
policy profile” on page 9-3, CoS-based classification rules will take precedence over priority
settings configured with the set port priority command described in this section.