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D-Link DES-5016 manual Advantages of Cut-Through, Disadvantages of Cut-Through

Models: DES-5016

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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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D-Link DES-5016 manual Advantages of Cut-Through, Disadvantages of Cut-Through

Contents

Rev. 01 January 651DES32.K15 DES-5016 Fast Ethernet Switching System User’s GuideSoftware D-Link Limited Warranty HardwareCopyright 1999 by D-Link Systems, Inc. All rights reserved In the Middle East except Israel, Asia, Oceania and Africa D-Link Offices for Registration and Warranty ServiceIn North, Central, and South America In Europe and IsraelFCC Warning Copyright StatementCE Mark Warning Wichtige Sicherheitshinweise Table of Contents 100BASE-FX/ 1000BASE-SX Switch Port Module Connecting the DES-5016 to other Switches and HubsSystem Configuration Switch Port 1-8, 9-16 and Optional Module ConfigurationSpanning Tree Configuration Change PasswordSwitch Port Configuration Switch Port Configuration MenuAudience About This GuideOrganization Introduction Features∙ VLAN support for eight broadcast domains Fast Ethernet Switching System User’s Guide∙ Supports Full and Half Duplex for both 10 Mbps and 100 Mbps ∙ The DES-5016 supports SNMP for RFC 1213, RFC 1757, and RFCDES-5016TX Front PanelFigure 2 DES-5016TF DES-5016TFFigure 3 DES-5016FX Figure 4 DES-5016 Rear Panel Rear PanelTelnet Management Management MethodsUpdating Firmware Local Console ManagementUnpacking the DES-5016 Installing the DES-5016Installation Options Figure 5 Install Feet on Bottom Desktop/ Shelf InstallationInstalling the DES-5016 Fast Ethernet Switching System User’s GuideFigure 6 Attach Feet Figure 7 Attach Mounting Brackets Rack InstallationInstalling the DES-5016 Fast Ethernet Switching System User’s GuideFigure 8 Insert into Rack Installing Optional Modules Installing the DES-5016 Fast Ethernet Switching System User’s GuideFigure 9 Remove Blank Bracket Installing the DES-5016 Fast Ethernet Switching System User’s GuideFigure 10 Insert Optional Module Power On Cable Specifications Connecting the DES-5016 to the NetworkCopper Cable Figure 11 Cable Diagram Fast Ethernet Switching System User’s GuideConnecting the DES-5016 to the Network Table 1 Cable Specifications for Copper ConnectionFiber Optic Cable RS-232 Port PortsMDI-X Ports Fiber Optic PortsDES-5016 to DES-5016 Connection Connecting the DES-5016 to other Switches and HubsFigure 12 DES-5016TF LEDs LEDsStatus PowerDiagnostic CPU ModuleLit or Flashing Table 3 CPU Module LEDsDark Full/ Half 8-Port TX ModuleLink 100/10Lit or Flashing Table 4 8-Port TX Module LEDsDark Dark 8-Port FX ModuleLink/ Act Lit or Flashing2-Port 100BASE-FX Module Dark Fast Ethernet Switching System User’s GuideLEDs Table 6 FX Module LEDTable 7 Gigabit Module LED 1-Port 1000BASE-SX ModuleLink Figure 17 1-Port 1000BASE-SX ModuleManaging the DES-5016 Local Console Management ∙ User Name D-Link ∙ Default Password D-Link∙ Data bits ∙ Parity None ∙ Stop bits ∙ Flow Control None Telnet Log In ∙ Default User Name D-Link ∙ Default Password D-LinkFigure 19 Help Message Help MessagePanel Conventions Console 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 DescriptionFigure 23 System Reset System ResetFigure 24 Factory Reset Factory ResetManaging the DES-5016 Fast Ethernet Switching System User’s GuideFigure 25 Factory Reset Confirmation 1. Select No or Exit 2. Press EnterAdvantages of Store and Forward System Rate ControlDisadvantages of Store and Forward Disadvantages of Cut-Through Advantages of Cut-ThroughFigure 27 Software Update menu Software Update MenuManaging the DES-5016 Fast Ethernet Switching System User’s GuideFigure 28 Transfer Firmware Figure 29 Send File Figure 31 EEPROM Fast Ethernet Switching System User’s GuideManaging the DES-5016 Figure 30 XmodemUser Account Change Menu User Account ManagementCreate New User PasswordConfirm Password Access Level4. Toggle the space bar to set the access level of the new user Fast Ethernet Switching System User’s Guide2. Enter the Password 3. Reenter the password in the Confirm Password fieldAccess Level Delete UsersStatus Delete3. Select Save and press Enter Fast Ethernet Switching System User’s Guide2. Toggle the space bar to change the current Access Level 1. Select the Access Level of the user you want to deleteConfirm Password Change PasswordOld Password New Password5. Select Save and press Enter to save your changes Fast Ethernet Switching System User’s GuideManaging the DES-5016 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 BridgeTable 8 User Selective STA Parameters SNMP Management Configuration SNMP Community String SNMP Management Configuration MenuSNMP Manager Setting Access RightLink Change Event SNMP Trap Manager SettingAuthentication Failure Cold Start1. Enter the IP Address of the Trap Manager Fast Ethernet Switching System User’s GuideFollow these steps to configure the SNMP Trap Manager Setting 4. Select Save and press EnterVLAN Port Management Figure 39 VLAN Port Management menu VLAN Port Management MenuTrunkGroup Create New VLANNew VLAN Name Port #3. Select Save and press Enter Fast Ethernet Switching System User’s GuideFollow these steps to create a VLAN 1. Enter the name of the VLAN you are creatingFigure 41 Delete VLAN menu Delete VLAN MenuVLAN Name DeleteVirtual LAN Name Modify VLAN MenuFigure 42 Modify VLAN menu Figure 43 Trunking Port Management menu Trunking Port Management MenuPort # Create New Trunking PortNew Trunking Group Name Name3. Select Save and press Enter Fast Ethernet Switching System User’s GuideFollow these steps to create a TrunkGroup 1. Enter the name of the TrunkGroupDelete Delete Trunking PortTrunking Port Modify Trunking PortFigure 46 Modify Trunking Port Trunking Port NamePOST Errors TroubleshootingProblem SolutionTroubleshooting Fast Ethernet Switching System User’s GuideTroubleshooting Fast Ethernet Switching System User’s GuideTable 9 Diagnostic LED Switch Specifications Appendix A DES-5016 Technical SpecificationsPort Specifications ∙ Full or Half Duplex for all 10/100-TX ports Fast Ethernet Switching System User’s GuideAppendix A General Fast Ethernet Switching System User’s GuideAppendix A Physical and Environmental Fast Ethernet Switching System User’s GuideAppendix A Transmission Index