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Configuring Policy Class of Service (CoS)

SecureStack B2 Configuration Guide 12-17

Configuring Policy Class of Service (CoS)

TheSecureStackB2supportsClassofService(CoS),whichallowsyoutoassignmission‐critical

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

congestion.Thehigherprioritytrafficgoing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(0‐7,with7grantedhighestpriority)andupto8transmit

queues(0‐7)foreachport.

Bydefault,policy

‐basedCoSisdisabledonthedevice,anddefaultoruser‐assignedport‐based

802.1D(802.1p)settingsareusedtodeterminetrafficprioritization.Whenpolicy‐based CoSis

enabled,thedefaultanduser‐assignedpolicy‐basedsettingswilloverrideport‐basedsettings

describedinChapter 13.

ClassofServicefunctionalitycan

alsobeusedtocontrolbroadcast,unknownunicast,and/or

multicastflooding.Thisfeaturepreventsconfiguredportsfrombeingdisruptedbyatrafficstorm

byrate‐limitingspecifictypesofpacketsthroughthoseports.Referto“AboutCoS‐BasedFlood

Control”onpage 12‐19formoreinformation.

About Policy-Based CoS Configurations

Onceenabledusingthesetcosstatecommand,youcanaddtothepolicy‐basedCoSfunctionby 

definingnewportgroupings,andassigninginboundratelimiters.Theprocessforuser‐defined

CoSconfiguration involvesthefollowingstepsandassociatedcommandslistedinProcedure 12‐1.

Anexamplefollowstheprocedure.

Example

Thisexamplecreatesdifferentinboundratelimitersfortwoportgroupsandthenassignsthemto

trafficwithaCoSsettingof0.

1. Configuretwoportgroups,oneforuserportsandoneforuplinkportsandassignportstothe

groups.Portgroup1.0willrepresentuserports,group2.0

willrepresentuplinkports.

B2(su)->set cos port-config irl 1.0 name Users ports fe.1.1-46

B2(su)->set cos port-config irl 2.0 name Uplink ports fe.1.47-48

Note: It is recommended that you use Enterasys Networks NetSight Policy Manager as an

alternative to CLI for configuring policy-based CoS on the switches.

Note: Unlike CoS-based rate limiting, CoS-based flood control does not require a policy license on

SecureStack B2 and B3 switches or on standalone D2 switches.

Procedure 12-1 User-Defined CoS Configuration

Step Task Command(s)

1. Enable CoS set cos state enable

2. Create CoS IRL port groups set cos port-config irl

3. Define physical rate limiters for groups set cos port-resource irl

4. Create virtual reference for the IRL resource

(physical reference) for each port group

set cos reference

5. Add IRL reference to CoS settings table set cos settings

1 2 ... 352 353 354 355 356 357 358 359 360 361 362 ... 599 600

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