Specifications

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About QoS

RoamAbout Mobility System Software Configuration Guide 12-9

WMM QoS on the RoamAbout Switch

MSSperformsclassificationoningresstodetermineapacket’sCoSvalue.ThisCoSvalueisused

tomarkthepacketattheegressinterface.

Theclassificationandmarkingperformedbytheswitchdependonwhethertheingressinterface

hasan802.1porDSCPvalueotherthan0,andwhethertheegress

interfaceistaggedorisanIP

tunnel.

ThemappingsbetweenDSCPandCoSvaluesareconfigurable.(See“6,7Voice00”onpage 12‐

22.)802.1pandCoSvaluesmapdirectlyandarenotconfigurable.DSCP0oftheDSCP‐to‐CoS

mapisreserved.802.1pdeterminesCoSforpacketswith

DSCP0.CoS0oftheCoS‐to‐DSCPmap

isalsoreserved.CoS0packetsaremarkedwithDSCP0.

YoucanuseACLstooverridemarkingforspecificpackets.ConfigureACEsthatusethedscp

optiontomatchoningressDSCPvalue,andusethecosoptiontomark

CoS.ACoSvalueassigned

byanACEoverridestheinternalCoSvalue.(Forinformation,see“UsingACLstoChangeCoS”

onpage 15‐20.)

Table 12‐2showshowWMMpriorityinformationismappedacrossthenetwork.WhenWMMis

enabled,Enterasysswitchesandaccesspointsperformthesemappingsautomatically.

Youcan

usestaticCoStoassignthesameCoSvaluetoallpacketsforaspecificSSID.Thestatic

CoSvalueisassignedontheAP,inbothtrafficdirections(fromtheclienttotheswitchandfrom

theswitchtotheclient).(Forinformation,see“ConfiguringStaticCoS”on

page 12‐16.)

YoualsocanuseACLstooverridemarkingforspecificpackets.ConfigureACEsthatusethedscp

optiontomatchoningressDSCPvalue,andusethecosoptiontomarkCoS.ACoSvalueassigned

byanACEoverridestheinternalCoSvalue.(Forinformation,see“UsingACLs

toChangeCoS”

onpage 15‐20.)

Table 12-2 WMM Priority Mappings

Service

Type IP Precedence IP ToS DSCP 802.1p CoS

AP Forwarding

Queue

0 0 0 0 0 0 Background

3 3 0x60 24 3 3

1 1 0x20 8 1 1 Best Effort

2 2 0x40 16 2 2

4 4 0x80 32 4 4 Video

5 5 0xa0 40 5 5

6 6 0xc0 48 6 6 Voice

7 7 0xe0 56 7 7