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D-Link DES-5016 Spanning Tree Algorithm, Bridge Priority, Root Cost, Hello Time, Max Age Time

Models: DES-5016

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Spanning Tree Algorithm

Fast Ethernet Switching System User’s Guide

Spanning Tree Algorithm

Spanning Tree Algorithm can be enabled or disabled. Use Spanning Tree to prevent network loops.

Bridge Priority

The Bridge Priority can be from 0 to 65535. Zero is the highest Bridge Priority. The higher the Bridge Priority the greater the chance that the DES-5016 will be selected as the Root Bridge. The DES-5016 with the highest Bridge Priority is the Root Bridge.

Root Cost

The Root Cost is the number of times a packet is regenerated before reaching its destination. A source sends a packet to the first device (switch or hub) on the network. When the packet reaches the next hub or switch and is sent out again, the Path Cost becomes two. Each switch and active hub regenerates the packet. To determine the Root Path Cost, count the number of times the packet is regenerated.

The switch with the lowest Path Cost is the Root Bridge. Make the Root Bridge the best switch on the network.

Hello Time

Is the interval between two transmissions of packets sent by the Root Bridge to tell all other switches that it is the Root Bridge. The Hello Time can be set manually, with a range in seconds from 1 to 10. If the Hello Time is set for the switch and the switch is not the Root Bridge then the Hello Time will not take effect until the switch becomes the Root Bridge.

Forward Delay Time

This is the time any port on the DES-5016 spends in the listening state while moving from the listening state to the forwarding state. It can be set from 4 to 30 seconds.

Use the following formula when setting the Hello Time and the Forward Delay Time:

2 x (Forward Delay minus 1 second) > Max Age

2 x (Hello Time plus 1 second) < Max Age

Max Age Time

Is the time a non-root bridge waits for a packet to be sent. At the end of the Max Age, if a packet has not been received from the Root Bridge, the DES-5016 will start sending its own packets and request permission to become the Root Bridge. If it turns out that the DES-5016 has the lowest Bridge Identifier it will become the Root Bridge.

Managing the DES-5016	62

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D-Link DES-5016 manual Spanning Tree Algorithm, Bridge Priority, Root Cost, Hello Time, Forward Delay Time, Max Age Time

Contents

DES-5016 Fast Ethernet Switching System User’s Guide Rev. 01 January 651DES32.K15Software D-Link Limited Warranty HardwareCopyright 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 AfricaFCC Warning Copyright StatementCE 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 ConfigurationAudience About This GuideOrganization 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-5016TXFigure 2 DES-5016TF 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 BottomInstalling the DES-5016 Fast Ethernet Switching System User’s GuideFigure 6 Attach Feet Rack Installation Figure 7 Attach Mounting BracketsInstalling 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 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 StatusLit or Flashing Table 3 CPU Module LEDsDark 100/10 8-Port TX ModuleLink Full/ HalfLit or Flashing Table 4 8-Port TX Module LEDsDark 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 Local Console Management ∙ User Name D-Link ∙ Default Password D-Link∙ 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-5016Advantages of Store and Forward System Rate ControlDisadvantages of Store and Forward Advantages of Cut-Through Disadvantages of Cut-ThroughSoftware Update Menu Figure 27 Software Update menuManaging the DES-5016 Fast Ethernet Switching System User’s GuideFigure 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 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 Bridge Priority Forward Delay TimeSpanning Tree Algorithm Root CostRoot Port Root BridgeTable 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 menuVirtual LAN Name Modify VLAN MenuFigure 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 TroubleshootingTroubleshooting 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