ZXR105900/5200SeriesUserManual(BasicCongurationVolume)
TrafcclassicationofQoSisbasedonACLandtheACLrulemust
bepermit.Theusercanclassifypacketsaccordingtosomelter
optionsoftheACLwhichareasfollows:SourceIPaddress,desti-
nationIPaddress,sourceMACaddress,destinationMACaddress,
IPprotocoltype,TCPsourceportNo.TCPdestinationportNo.,
UDPsourceportNo.,UDPdestinationportNo.,ICMPtype,ICMP
code,DSCP ,T oS,precedence,sourceVLANID,Layer2Ethernet
protocoltypeand802.1ppriorityvalue.
TrafficPolicing
Trafcpolicingistoimposerestrictiononbandwidthoccupiedby
sometrafcowtopreventitfromexceedingspeciedbandwidth
andthusaffectingotherservices.Asfortheexceedingamountof
trafcs,conductthefollowingoperation:
�Discardorforward
�ModifyitsDSCPvalue
�Modifyitsdropprecedence(packetswithhigherdropprece-
dencewillbedroppedpreferentiallywhencongestionoccurs)
Trafcpolicingwillnotintroduceextradelay.Itsworkingprocess
isshowninFigure19.
FIGURE19TRAFFICPOLICINGWORKINGFLOW
ZXR105900/5200implementstheSingleRateThreeColorMarker
(SrTCM)(RFC2697)andTwoRateThreeColorMarker(TrTCM)
(RFC2698)functions,whichbothsupportthecolor-blindandcolor-
awaremodes.
Itassumesthatpacketsarecolorlessincolor-blindmodebutas-
sumesthatpacketsaremarkedinacolorincolor-awaremode.
Ontheswitch,eachpackettraversingtheswitchwillbeassigned
acoloraccordingtosomeprinciple(packetinformation).Maker
colorstheIPpacketaccordingtoresultfromMeterandthecolor
ismarkedinDSeld.
70CondentialandProprietaryInformationofZTECORPORATION