D-Link DES-5016 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-5016 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-5016 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-5016

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Contents DES-5016 Fast Ethernet Switching System User’s Guide Software Link Limited Warranty HardwareNorth, Central, and South America Link Offices for Registration and Warranty ServiceEurope and Israel Copyright Statement Wichtige Sicherheitshinweise Table of Contents Page Page Audience About This GuideOrganization Introduction FeaturesPage DES-5016TX Front PanelDES-5016TF DES-5016TFDES-5016 Rear Panel Rear PanelTelnet Management Management MethodsUpdating Firmware Local Console ManagementUnpacking the DES-5016 Installing the DES-5016Installation Options Install Feet on Bottom Desktop/ Shelf InstallationAttach Feet Attach Mounting Brackets Rack InstallationInsert into Rack Installing Optional Modules Remove Blank Bracket Insert Optional Module Power On Cable Specifications Connecting the DES-5016 to the NetworkCopper Cable Cable Diagram Fiber Optic Cable RS-232 Port PortsMDI-X Ports Fiber Optic PortsDES-5016 to DES-5016 Connection Connecting the DES-5016 to other Switches and HubsDES-5016TF LEDs LEDsStatus PowerDiagnostic CPU ModuleLED 100/10 Port TX ModuleLink ActPort TX Module LEDs Link/ Act Port FX ModuleCol Port 100BASE-FX ModuleLit Dark Gigabit Module LED Port 1000BASE-SX ModuleManaging the DES-5016 ∙ 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 ConventionsConsole Program System ConfigurationSwitch Port 1-8, 9-16 and Optional Module Configuration 100BASE-FX/ 1000BASE-SX Switch Port ModuleTrunking Port Management Spanning Tree ConfigurationSnmp Management Configuration Vlan Port ManagementSystem Information System Configuration MenuSystem Reset Factory Reset to Default Config ValuesHardware Revision Software UpdateBoot Prom Firmware Version System Information MenuSystem Name LAN Default GatewayMAC Address System DescriptionSystem Reset System ResetFactory Reset Factory ResetFactory Reset Confirmation Advantages of Store and Forward System Rate ControlDisadvantages 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 ManagementCreate New User PasswordConfirm Password Access LevelPage Status Delete UsersDelete Page Old Password Change PasswordNew Password Page Switch Port Configuration State Switch Port Configuration MenuPhysical Priority Port StateFlow Control Spanning Tree Configuration Menu Spanning Tree ConfigurationSTA Operation Levels Root Cost Forward Delay TimeSpanning Tree Algorithm Bridge PriorityRoot Port Root BridgeSnmp Management Configuration Snmp Community String Snmp Management Configuration MenuSnmp Manager Setting Access RightLink Change Event Snmp Trap Manager SettingAuthentication Failure Cold StartPage Vlan Port Management Vlan Port Management menu Vlan Port Management MenuTrunkGroup Create New VlanNew Vlan Name Port #Page Vlan Name Delete Vlan MenuVirtual LAN Name Modify Vlan MenuTrunking Port Management menu Trunking Port Management MenuNew Trunking Group Name Create New Trunking PortName Page Trunking Port Delete Trunking PortModify Trunking Port Modify Trunking Port Trunking Port NamePort States TroubleshootingProblem Solution Post Errors CablesPage Diagnostic LED Switch Specifications Appendix a DES-5016 Technical SpecificationsPort Specifications Page Fast Ethernet Switching System User’s Guide General EMI Fast Ethernet Switching System User’s Guide Performance Act IndexUser Name 52, 54