Disadvantages of Store and Forward | D-Link DES-5200 instruction

Fast Ethernet Switching System User’s Guide

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 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-5200 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-5200 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.Select the down arrow to change the setting.

2.Select Apply. Select Refresh to see the changes.

Web Management

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D-Link DES-5200 manual Disadvantages of Store and Forward

Contents

DES-5200 Fast Ethernet Switching System User’s Guide Hardware Limited WarrantyLink Offices for Registration and Warranty Service Software Europe and Israel Wichtige Sicherheitshinweise Table of Contents Web Management 125 Audience Organization Features Introduction Fast Ethernet Switching System User’s Guide Front Panel Models Full Size Modules Optional Modules DES-5224TX DES-5220TF DES-5216FX.A1 DES-5216FX Rear Panel DES-5200 Rear Panel Software Update Management Methods Installing the DES-5200 Unpacking the DES-5200 Installation Options Desktop/ Shelf Installation Install Feet on Bottom Attach Feet Rack Installation Attach Mounting Brackets Insert into Rack Installing Optional Modules Remove Blank Bracket Insert Optional Module Power On Cable Specifications Copper Cable 10BASE-T Cable Diagram Fiber Optic Cable Fiber Optic Ports PortsMDI-X Ports RS-232 Port Connecting the DES-5200 to other Switches and Hubs DES-5200 to DES-5200 Connection LEDs CPU Module PowerDiagnostic Status LED Link Port 10/100-TX ModuleDuplex 100/10 FDX Col Link/Act Port FX ModuleFull/Half Port 100BASE-FX Module Port 100BASE-FX Module FX Module LED Port 1000BASE-SX Module Act Console Based Management Console Management ∙ Parity None ∙ Stop bits ∙ Flow Control Xon/Xoff Configuring Through the Ethernet Port Telnet Management ∙ Default User Name D-Link ∙ Default Password D-Link Log Help Message Help Message Panel Conventions Spacebar Spanning Tree Configuration System ConfigurationSwitch Port Configuration Console Program Trunking Port Management Snmp Management ConfigurationVlan Port Management Port Statistics Factory Reset to Default Config Values System Configuration MenuSystem Reset System Information System Information Menu Software UpdateBoot Prom Firmware Version Hardware Revision System Description LAN Default GatewayMAC Address System Name System Reset Factory Reset Factory Reset Advantages of Store and Forward Disadvantages of Store and Forward Advantages of Cut-Through Disadvantages of Cut-Through Software Update Menu Software Update Configuration Software Update Confirmation Send File Xmodem Tftp Tftp Transfer Complete User Account Management User Account Change Menu Access Level PasswordConfirm Password Create New User Fast Ethernet Switching System User’s Guide Delete Users Delete Fast Ethernet Switching System User’s Guide Old Password Change PasswordNew Password Select Save and press Enter to save your changes Switch Port Configuration State Switch Port Configuration MenuPhysical Port State Priority STA Operation Levels Spanning Tree ConfigurationSpanning Tree Configuration Menu Spanning Tree Algorithm Root Cost Forward Delay TimeBridge Priority Hello Time Root Bridge Root Port Snmp Management Configuration Access Right Snmp Management Configuration MenuSnmp Manager Setting Snmp Community String Cold Start Snmp Trap Manager SettingAuthentication Failure Link Change Event Status Vlan Port Management Vlan Port Management Menu Vlan Port Management menu Port # Create New VlanNew Vlan Name TrunkGroup Fast Ethernet Switching System User’s Guide Delete Vlan Menu Vlan Name Modify Vlan Menu Virtual LAN Name Trunking Port Management Menu Trunking Port Management menu New Trunking Group Name Create New Trunking PortName Fast Ethernet Switching System User’s Guide Delete Trunking Port Trunking Port Modify Trunking Port Trunking Port Name Port Statistics Rx Align or FCS Errors TX FCS ErrorsTx Run Errors Rx Error Oversized Rx64 Rx Error UndersizedRx Good Undersized Rx65 to Apply Using Web ManagementCommands Refresh Logging User Name and Password System Configuration System Information Hardware Revision Boot Prom Firmware VersionSystem Information Menu Software Version System Description LAN Default GatewayMAC Address System Name System Reset Factory Reset Factory Reset Confirmation System Rate Control Disadvantages of Store and Forward Software Update Web Management 101 Software Download Download Successful Web Management 104 Change Password Web Management 106 Switch Port Configuration Confirmation Web Management 108 Spanning Tree Configuration Web Management 110 Web Management 111 Web Management 112 Web Management 113 Snmp Manager Setting Snmp Trap Manager Setting Snmp Trap Manager Setting ∙ Cold Start ∙ Authentication Failure ∙ Link Change Event Web Management 117 Web Management 118 Ports Vlan Port Management Web Management 120 Trunking Group Name Trunking Port Management Web Management 122 Web Management 123 Web Management 124 Troubleshooting Troubleshooting 126 LED Error Chart Explanation of LED Error Status Modular Status Error LED Indicator Chart Appendix a DES-5200 Technical Specifications Switch Specifications Port Specifications Appendix a 132 EMI Appendix a 134 Index 45, 92 Xmodem