D-Link DES-3216 manual System Rate Control, Advantages of Store and Forward

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10/100 Auto Negotiation Switch User’s Guide

System Rate Control

The System Rate Control panel, displayed in Figure 13, allows you to set the packet forwarding rate on the DES-3216. There are two options: Store & Forward and Cut-Through.

Figure 13: System Rate Control

The DES-3216 can be set for Store and Forward or Cut-Through. This is a global setting that affects all the ports except the RS-232 port.

Store and Forward means that when the DES-3216 receives an incoming packet it “stores” the packet until the entire data packet has been received before it “forwards” the packet to a destination.

In Cut-Through mode the DES-3216 begins sending out the packet as soon as it receives the first 128 bytes of data. The first 128 bytes contain the destination of the packet.

Advantages of Store and Forward

Store and Forward only sends out valid data packets. Bad packets created by collisions on the network or damaged packets are filtered out.

Always use Store and Forward when some devices on the network run at 10 Mbps and others run at 100 Mbps.

Disadvantages of Store and Forward

Store and Forward requires more time because it receives the whole packet before sending it out. Every byte buffered is an additional eight microseconds of delay. For example, 1500

Managing the DES-3216

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Contents DES-3216 10/100 Auto Negotiation Switch User’s Guide Link Limited Warranty Hardware North, Central, and South America FCC Warning Wichtige Sicherheitshinweise Table of Contents Page Page Audience About This GuideOrganization Features IntroductionFront Panel Rear PanelLocal Console Management Management MethodsUpdating Firmware Telnet ManagementInstallation Options Installing the DES-3216Desktop/ Shelf Installation Power On Rack InstallationConnecting the DES-3216 to the Network Cable SpecificationsCable Diagram DES-3216 to DES-3216 Connection Connecting the DES-3216 to the DES-5024 and HubsPorts MDI-X PortLQN LEDsPower LED DES-3216 LED PanelLED Managing the DES-3216 Local Console ManagementTelnet ∙ Data bits ∙ Parity None ∙ Stop bits ∙ Flow Control None∙ Default User Name D-Link ∙ Default Password D-Link LogHelp Message Help MessagePanel Conventions SpacebarSpanning Tree Configuration System ConfigurationSwitch Port 1-8, 9-16 Configuration Console ProgramVlan Port Management Snmp Management ConfigurationTrunking Port Management Factory Reset to Default Config Values System Configuration MenuSystem Reset System InformationSystem Information Menu Software UpdateBoot Prom Firmware Version Hardware RevisionMAC Address LAN Default GatewaySoftware Version System DescriptionSystem Reset System ResetFactory Reset Factory ResetFactory Reset Confirmation Advantages of Store and Forward System Rate ControlDisadvantages of Store and Forward Advantages of Cut-Through Disadvantages of Cut-ThroughSoftware Update Menu Software UpdateSoftware Update Transfer File Transfer through Xmodem User Account Change Menu User Account ManagementCreate New User Access Level PasswordConfirm Password User NameStatus Delete UsersDelete Change Password Change PasswordOld Password New PasswordSwitch Port Configuration State Switch Port Configuration MenuPhysical Port State PrioritySTA Operation Levels Spanning Tree ConfigurationSpanning Tree Configuration Menu Spanning Tree AlgorithmRoot Cost Forward Delay TimeBridge Priority Hello TimeRoot Port User Selective STA parametersSnmp Management Configuration Snmp Management Configuration MenuAccess Right Snmp Manager SettingSnmp Community String Cold Start Snmp Trap Manager SettingAuthentication Failure Link Change EventPage Vlan Port Management Vlan Port Management MenuVlan Port Management menu Port # Create New VlanNew Vlan Name TrunkGroupDelete Vlan Menu Vlan NameModify Vlan Menu Virtual LAN NameTrunking Port Management Menu Trunking Port Management menuNew Trunking Group Name Create New Trunking PortName Delete Trunking Port Trunking PortModify Trunking Port Trunking Port NameTroubleshooting Problem SolutionPage Switch Specifications Appendix a DES-3216 Technical SpecificationsPort Specifications 10/100 Auto Negotiation Switch Users’ Guide General EMI 10/100 Auto Negotiation Switch Users’ Guide Performance Access Level IndexUser Name 32, 33