Specifications

Policy Overview
May 18, 2009 Page 5 of 32
Assigning a Class of Service to this Role
HowapacketistreatedasittransitsthelinkcanbeconfiguredintheClassofService(CoS).Itis
throughaCoSthatQualityofService(QoS)isimplemented.ACoScanbeconfiguredforthe
followingvalues:
• 802.1ppriority
•IPTypeofService(ToS)rewritevalue
•PriorityTransmitQueue
(TxQ)alongwithaforwardingbehavior
• Inboundandoutboundratelimiterpertransmitqueue
• Outboundrateshaperpertransmitqueue
CoSconfigurationsareidentifiedbyanumericvaluebetween0‐255.0‐7arefixed802.1pCoS
configurations.CoSconfigurations8‐255are userconfigurable.Policyusesthecosoption
followed
bytheCoSconfigurationIDvaluetoassociateaCoSwithapolicyrole.
QoSconfigurationdetailsarebeyondthescopeofthisfeatureguide.SeetheQoSConfiguration
featureguidelocatedathttp://secure.enterasys.com/support /manuals/foracompletediscussion
ofQoSconfiguration.
Adding Tagged, Untagged, and Forbidden Ports to the VLAN Egress Lists
TheVLANEgresslistcontainsalistofportsthat aframeforthisVLANcanexit.Specified ports
areautomaticallyassignedtotheVLANegresslistforthispolicyroleastagged,untagged,or
forbidden.
Overwriting VLAN Tags Priority and Classification Settings
Enhanced Policy
TCIoverwritesupportstheapplicationofrulestoapolicyrolethatoverwritethecurrentuser
priorityandotherclassificationinformationintheVLANtag’sTCIfield.TCIoverwritemustbe
enabledforboththepolicyroleandtheporttheroleisappliedto.
Usethesetpolicyprofiletci
‐overwritecommandtoenableTCIoverwriteonapolicyrole.
Usethesetporttcioverwritecomm andtoenableTCIoverwriteonthespecifiedport.
VLAN-to-Policy Mapping
Enhanced Policy
VLAN‐to‐PolicymappingprovidesforthemanualconfigurationofaVLAN‐to‐Policyassociation
thatcreatesapolicymaptableentrybetweenthespecifiedVLANandthespecifiedpolicyrole.A 
policymaptableholdstheVLAN‐to‐Policymappings.WhenanincomingtaggedVLANpacketis
seenbytheswitch,a
lookupofthepolicymaptabledetermineswhetheraVLAN‐to‐policy
mappingexists.Ifthemappingexists,theassociatedpolicyisappliedtothispacket.
Thisfeaturecanbeusedatthedistributionlayerinenvironmentswherenon‐policycapableedge
switchesaredeployedandthereisnopossibilityof
applyingEnterasyspolicyattheedge.Tagged
framesreceivedatthedistributionlayerinterfaceforaVLANwithanentryinthepolicymaptable
willhavetheassociatedpolicyappliedtotheframe.