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D-Link DES-5016 manual System Rate Control, Advantages of Store and Forward

Models: DES-5016

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System Rate Control

Fast Ethernet Switching System User’s Guide

System Rate Control

The System Rate Control panel, displayed in Figure 26, allows you to set the packet forwarding rate on the DES-5016. There are two options: Store & Forward and Cut- Through.

Figure 26: System Rate Control

The DES-5016 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-5016 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-5016 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

Managing the DES-5016	46

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D-Link DES-5016 manual System Rate Control, Advantages of Store and Forward, Disadvantages of Store and Forward

Contents

DES-5016 Fast Ethernet Switching System User’s Guide Rev. 01 January 651DES32.K15D-Link Limited Warranty Hardware SoftwareCopyright 1999 by D-Link Systems, Inc. All rights reserved In Europe and Israel D-Link Offices for Registration and Warranty ServiceIn North, Central, and South America In the Middle East except Israel, Asia, Oceania and AfricaCopyright Statement FCC WarningCE Mark Warning Wichtige Sicherheitshinweise Table of Contents Switch Port 1-8, 9-16 and Optional Module Configuration Connecting the DES-5016 to other Switches and HubsSystem Configuration 100BASE-FX/ 1000BASE-SX Switch Port ModuleSwitch Port Configuration Menu Change PasswordSwitch Port Configuration Spanning Tree ConfigurationAbout This Guide AudienceOrganization Features Introduction∙ The DES-5016 supports SNMP for RFC 1213, RFC 1757, and RFC Fast Ethernet Switching System User’s Guide∙ Supports Full and Half Duplex for both 10 Mbps and 100 Mbps ∙ VLAN support for eight broadcast domainsFront Panel DES-5016TXDES-5016TF Figure 2 DES-5016TFFigure 3 DES-5016FX Rear Panel Figure 4 DES-5016 Rear PanelLocal Console Management Management MethodsUpdating Firmware Telnet ManagementInstalling the DES-5016 Unpacking the DES-5016Installation Options Desktop/ Shelf Installation Figure 5 Install Feet on BottomFast Ethernet Switching System User’s Guide Installing the DES-5016Figure 6 Attach Feet Rack Installation Figure 7 Attach Mounting BracketsFast Ethernet Switching System User’s Guide Installing the DES-5016Figure 8 Insert into Rack Installing Optional Modules Fast Ethernet Switching System User’s Guide Installing the DES-5016Figure 9 Remove Blank Bracket Fast Ethernet Switching System User’s Guide Installing the DES-5016Figure 10 Insert Optional Module Power On Connecting the DES-5016 to the Network Cable SpecificationsCopper Cable Table 1 Cable Specifications for Copper Connection Fast Ethernet Switching System User’s GuideConnecting the DES-5016 to the Network Figure 11 Cable DiagramFiber Optic Cable Fiber Optic Ports PortsMDI-X Ports RS-232 PortConnecting the DES-5016 to other Switches and Hubs DES-5016 to DES-5016 ConnectionLEDs Figure 12 DES-5016TF LEDsCPU Module PowerDiagnostic StatusTable 3 CPU Module LEDs Lit or FlashingDark 100/10 8-Port TX ModuleLink Full/ HalfTable 4 8-Port TX Module LEDs Lit or FlashingDark Lit or Flashing 8-Port FX ModuleLink/ Act Dark2-Port 100BASE-FX Module Table 6 FX Module LED Fast Ethernet Switching System User’s GuideLEDs DarkFigure 17 1-Port 1000BASE-SX Module 1-Port 1000BASE-SX ModuleLink Table 7 Gigabit Module LEDManaging the DES-5016 ∙ User Name D-Link ∙ Default Password D-Link Local Console Management∙ Data bits ∙ Parity None ∙ Stop bits ∙ Flow Control None Telnet ∙ Default User Name D-Link ∙ Default Password D-Link Log InHelp Message Figure 19 Help MessagePanel Conventions 100BASE-FX/ 1000BASE-SX Switch Port Module System ConfigurationSwitch Port 1-8, 9-16 and Optional Module Configuration Console ProgramVLAN Port Management Spanning Tree ConfigurationSNMP Management Configuration Trunking Port ManagementFactory Reset to Default Config Values System Configuration MenuSystem Reset System InformationSystem Information Menu Software UpdateBoot PROM Firmware Version Hardware RevisionSystem Description LAN Default GatewayMAC Address System NameSystem Reset Figure 23 System ResetFactory Reset Figure 24 Factory Reset1. Select No or Exit 2. Press Enter Fast Ethernet Switching System User’s GuideFigure 25 Factory Reset Confirmation Managing the DES-5016System Rate Control Advantages of Store and ForwardDisadvantages of Store and Forward Advantages of Cut-Through Disadvantages of Cut-ThroughSoftware Update Menu Figure 27 Software Update menuFast Ethernet Switching System User’s Guide Managing the DES-5016Figure 28 Transfer Firmware Figure 29 Send File Figure 30 Xmodem Fast Ethernet Switching System User’s GuideManaging the DES-5016 Figure 31 EEPROMUser Account Management User Account Change MenuAccess Level PasswordConfirm Password Create New User3. Reenter the password in the Confirm Password field Fast Ethernet Switching System User’s Guide2. Enter the Password 4. Toggle the space bar to set the access level of the new userDelete Delete UsersStatus Access Level1. Select the Access Level of the user you want to delete Fast Ethernet Switching System User’s Guide2. Toggle the space bar to change the current Access Level 3. Select Save and press EnterNew Password Change PasswordOld Password Confirm PasswordFast Ethernet Switching System User’s Guide 5. Select Save and press Enter to save your changesManaging the DES-5016 Switch Port Configuration Switch Port Configuration Menu StatePhysical Port State PriorityFlow Control Spanning Tree Configuration Spanning Tree Configuration MenuSTA Operation Levels Bridge Priority Forward Delay TimeSpanning Tree Algorithm Root CostRoot Bridge Root PortTable 8 User Selective STA Parameters SNMP Management Configuration Access Right SNMP Management Configuration MenuSNMP Manager Setting SNMP Community StringCold Start SNMP Trap Manager SettingAuthentication Failure Link Change Event4. Select Save and press Enter Fast Ethernet Switching System User’s GuideFollow these steps to configure the SNMP Trap Manager Setting 1. Enter the IP Address of the Trap ManagerVLAN Port Management VLAN Port Management Menu Figure 39 VLAN Port Management menuPort # Create New VLANNew VLAN Name TrunkGroup1. Enter the name of the VLAN you are creating Fast Ethernet Switching System User’s GuideFollow these steps to create a VLAN 3. Select Save and press EnterDelete Delete VLAN MenuVLAN Name Figure 41 Delete VLAN menuModify VLAN Menu Virtual LAN NameFigure 42 Modify VLAN menu Trunking Port Management Menu Figure 43 Trunking Port Management menuName Create New Trunking PortNew Trunking Group Name Port #1. Enter the name of the TrunkGroup Fast Ethernet Switching System User’s GuideFollow these steps to create a TrunkGroup 3. Select Save and press EnterModify Trunking Port Delete Trunking PortTrunking Port DeleteTrunking Port Name Figure 46 Modify Trunking PortSolution TroubleshootingProblem POST ErrorsFast Ethernet Switching System User’s Guide TroubleshootingFast Ethernet Switching System User’s Guide TroubleshootingTable 9 Diagnostic LED Appendix A DES-5016 Technical Specifications Switch SpecificationsPort Specifications Fast Ethernet Switching System User’s Guide ∙ Full or Half Duplex for all 10/100-TX portsAppendix A Fast Ethernet Switching System User’s Guide GeneralAppendix A Fast Ethernet Switching System User’s Guide Physical and EnvironmentalAppendix A Transmission Index