KTI Networks KSD-800M Advanced Functions, QoS Function, Priority Level, Egress Service Policy

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3. Advanced Functions

To help a better understanding about the software management interfaces, this chapter describes some advanced functions provided by the switch.

3.1 QoS Function

The switch provides a powerful Quality of Service (QoS) function to guide the packet forwarding in two priority levels. The versatile classification methods can meet most of the application needs. The following figure illustrates the QoS operation flow when a packet received on the input port until it is transmitted out from the output port:

3.1.1 Priority Level

Each output (egress) port in the switch is equipped with two transmission priority queues to store the packets for transmission. The high priority queue stores the high priority packets and low priority queue stores the low priority packets.

3.1.2 Egress Service Policy

The packets in high priority queue and low priority queue are transmitted out from a port based on a user configured round robin ratio, called egress service policy between high priority queue and low priority queue. The switch provides four ratio options for the service policy:

[ 4:1 ] : 4 high priority packets then 1 low priority packet

[ 8:1 ] : 8 high priority packets then 1 low priority packet

[ 16 :1 ] : 16 high priority packets then 1 low priority packet

[Always high priority first] : Packets in high priority queue are sent first until the queue is empty

3.1.3 Packet Priority Classification

Each received packet is determined and classified into one of two priority levels, high priority and low priority upon reception. The switch provides many classification methods including:

Port based

802.1p based

IP DSCP based

IP network address based

They all can be configured to be activated or not. Some are per port configuration and some are global configuration for the switch. More than one classification method can be enabled at the same time. If a packet is classified as high priority in any one of the enabled (applied) classifications, the packet is forwarded to the high priority queue of the output port. Otherwise, it is classified as low priority.

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Contents Installation Guide KSD-800MPage Trademarks Table of Contents Snmp Management Plug and Play IntroductionModel series 10/100TX TP Ports 100FX fiber ports Auto Copper/Fiber ConnectionsBasic functions FeaturesDesigned for Industrial Applications Management functionsProduct Panels Front Panel Network PortsLED Indicators FunctionSpecifications Top Panel10/100TX Twisted Pair Ports Switch FunctionsLED Indicators Vlan Function Port Configuration Control FunctionSoftware Management Functions QoS FunctionMechanical DC Power InputModel Definitions EnvironmentalOptical Specifications Unpacking InstallationSafety Cautions DIN-Rail Mounting Panel Mounting Page Applying Power Using Terminal BlocksPower Failure Relay Output Using DC Power JackReset Button Making UTP ConnectionsFar End Fault Function Making Fiber ConnectionsLED Indication Function State InterpretationConfiguring Snmp Settings Configuring IP Address for the SwitchConfiguring User Name and Password Configuring Port 7 and PortQoS Function Egress Service PolicyAdvanced Functions Priority LevelDscp Classification per port setting Port-based Priority Setting per port setting3.2 802.1p Classification per port setting User Defined Dscpa Classification GlobalUser Defined IPA Classification Global Other QoS SettingsIP Network Address Classification User Defined IPB Classification GlobalVlan Function Vlan OperationUnmatched VID Filtering per port setting 2.1 802.1Q Tag Aware Vlan Mode global settingIngress Member Filtering global setting Ingress RulesPacket Forwarding under Vlan Egress Tag Rule per port settingVlan Group Mapping Egress Tagging RulesNull VID Replacement per port setting Summary of Vlan FunctionMain Menu Software ManagementTelnet Management Interface IP Settings Description IP MenuSnmp Settings Description Snmp MenuPort Config Status DescriptionPort Setting Description AdministratorAdministrator Vlan Settings Vlan Information Description Vlan IDInput Description Vlan Global Settings DescriptionVID Setting Description Per Port Settings Description Tagging with ingress Pvid for all packetsAdministrator QoS Settings Select 1 Show QoS Other Status to view other settings global QoS Other Settings Description Restore Default Values Security ManagerSetting Description Update FirmwareReboot System ExitStart Browser Software and Making Connection Login to the Switch UnitWeb Management Page Port Status Menu Port Status DescriptionBasic Menu Menu FunctionSnmp Entries IP Address IP Address Setting DescriptionSystem Settings Description Community Settings Description Port Controls Trap Manager Settings DescriptionPort Settings Description Vlan Controls Ingress Rules Global Settings DescriptionVlan Group Configuration Group Settings Description Per Port Settings Egress Rules Insertion for untagged packets only is selectedQoS Per Port Settings Description QoS ControlsQoS Global Settings Description IPA address and IPA subnet mask specify IPA user defined Settings Description Image Refresh TimeRestore Default Snmp Traps Snmp ManagementMIB Objects ObjectsAppendix. Factory Default Settings QoS Settings