Enterasys b5 User Manual

Configuring Policy Class of Service (CoS)
11-16 Policy Classification Configuration
Configuring Policy Class of Service (CoS)
TheEnterasysB5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 12.
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 11‐18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 11‐1.
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.
B5(su)->set cos port-config irl 1.0 name Users ports ge.1.1-46
B5(su)->set cos port-config irl 2.0 name Uplink ports ge.1.47-48
B5(su)->show cos port-config
Inbound Rate Limiting Port Configuration Entries
Note: It is recommended that you use Enterasys Networks NMS Policy Manager as an alternative
to CLI for configuring policy-based CoS on the switches.
Procedure 11-1 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

Enterasys b5 Specifications

General

Brand	Enterasys
Model	b5
Category	Other
Language	English