D-Link DES-5024 manual Advantages of Cut-Through, Disadvantages of Cut-Through

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Fast Ethernet Switching System User’s Guide

example, 1500 byte packets are delayed by 1200 microseconds in a Store and Forward device versus 60 microseconds in a Cut-Through device.

Store and Forward requires more memory because the DES-5024 must store the packet before sending it out.

Advantages of Cut-Through

Cut-Through is faster because the packet is sent as soon as the first 128 bytes are received.

Cut-Through requires less memory since the DES-5024 only reads the address but does not store the entire message.

Disadvantages of Cut-Through

Bad packets are perpetuated, taking up bandwidth.

The benefits diminish in high traffic networks.

Cut-Through can not be used on networks that use both Ethernet and Fast Ethernet. The network must use one or the other.

Follow these steps to change the default setting from Store and Forward to Cut-Through:

1.Toggle the space bar to change the setting.

2.Select Save and press Enter.

Managing the DES-5024

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Contents DES-5024 Fast Ethernet Switching System User’s Guide Link Limited Warranty Hardware North, Central, and South America Copyright Statement Wichtige Sicherheitshinweise Table of Contents Page Page Organization About This GuideAudience Introduction FeaturesPage DES-5024 Front Panel Front PanelDES-5024 Rear Panel Rear PanelUpdating Firmware Management MethodsLocal Console Management Telnet ManagementUnpacking the DES-5024 Installing the DES-5024Installation Options Install Feet on Bottom Desktop/ Shelf InstallationAttach Feet Rack Installation Attach Mounting Brackets Insert into Rack Installing Modules Remove Blank Bracket Insert Optional Module Power On Copper Cable Connecting the DES-5024 to the NetworkCable Specifications Cable Diagram Fiber Optic Cable MDI-X Ports PortsFiber Optic Ports RS-232 PortDES-5024 to DES-5024 Connection Connecting the DES-5024 to other Switches and HubsDES-5024 LEDs LEDsCPU Module PowerLED Link Port 10/100-TX ModuleCol Port 100BASE-FX ModuleLit Dark Act Port 1000BASE-SX ModuleManaging the DES-5024 ∙ Data bits ∙ Parity None ∙ Stop bits ∙ Flow Control None Local Console ManagementTelnet Log ∙ Default User Name D-Link ∙ Default Password D-LinkHelp Message Help MessageSpacebar Panel ConventionsUser Account Management System ConfigurationConsole Program Spanning Tree Configuration 100BASE-FX/ 1000BASE-SX Switch Port ModuleSnmp Management Configuration Vlan Port ManagementSystem Reset System Configuration MenuFactory Reset to Default Config Values System InformationBoot Prom Firmware Version Software UpdateSystem Information Menu Hardware RevisionMAC Address LAN Default GatewaySystem Description System NameSystem Reset System ResetFactory Reset Factory ResetFactory Reset confirmation Disadvantages of Store and Forward System Rate ControlAdvantages of Store and Forward Disadvantages of Cut-Through Advantages of Cut-ThroughSoftware Update menu Software Update MenuTransfer Firmware Xmodem User Account Change Menu User Account ManagementConfirm Password PasswordAccess Level Create New UserPage Delete Delete UsersStatus Page New Password Change PasswordOld Password Page Switch Port Configuration Physical Switch Port Configuration MenuState Flow Control Port StatePriority STA Operation Levels Spanning Tree ConfigurationSpanning Tree Configuration Menu Spanning Tree Algorithm Forward Delay TimeBridge Priority Root CostRoot Port Root BridgeSnmp Management Configuration Snmp Manager Setting Snmp Management Configuration MenuAccess Right Snmp Community StringAuthentication Failure Snmp Trap Manager SettingCold Start Link Change EventPage Vlan Port Management Vlan Port Management menu Vlan Port Management MenuNew Vlan Name Create New VlanPort # TrunkGroupPage Vlan Name Delete Vlan MenuVirtual LAN Name Modify Vlan MenuTrunking Port Management menu Trunking Port Management MenuName Create New Trunking PortNew Trunking Group Name Page Modify Trunking Port Delete Trunking PortTrunking Port Modify Trunking Port Trunking Port NameProblemSolution TroubleshootingPage Diagnostic LED Port Specifications Appendix a DES-5024 Technical SpecificationsSwitch Specifications 10BASE-T EMI Fast Ethernet Switching System User’s Guide Performance Index Access LevelUser Name 50, 52