3Com 2226-SFP, 2250-SFP, 2426-PWR manual Troubleshooting

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78CHAPTER 5: TROUBLESHOOTING

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Contents Installation and User Guide 3Com Corporation 350 Campus Drive Marlborough MA Contents Snmp 3COM CLI Reference Guide Page About this Guide ConventionsDocumentation Comments Product RegistrationAutosensing of MDI/MDIX Connections Overview of the Baseline SwitchFeatures and Capabilities Autonegotiating 10/100 Mbps PortsPhysical Features Power-over-Ethernet CapabilityGigabit Combo Ports RJ-45/SFP Front Panel RJ-45 10/100 PortsGigabit Combo Ports RJ-45/SFP 10/100BASE-TX Link/Activity Status LEDs SFP Mode Power LED Rear PanelPackage Contents Installing the Switch Important Safety InformationPositioning the Switch Importante Avviso di SicurezzaUsing the Mounting Kit Rack-Mounting or Free-StandingSupplying Power to the Switch Montagesatz AnweisungenPlacing Units On Top of Each Other Checking for Correct Operation Status MeaningUsing SFP Tranceivers Approved SFP TransceiversInserting an SFP Transceiver Performing Spot Checks Removing an SFP TransceiverRefer to Troubleshooting on Requirements for Accessing the Web Interface Using the Console Command Line Interface CLICLI Summary with Default IP Address Logging On to the Web Interface CLI Summary with Assigned IP AddressNavigating the Web Interface MenuMenu Item Description Snmp Buttons Port StatusRunning the 3Com Switch Detect Application 3Com Switch Detect Welcome Screen3Com Switch Detect Search Screen Connecting to the WEB Interface Configuration Overview Device Summary InformationDevice View Polling IntervalAutomatic IP Configuration Administration SettingsModifying the IP Address Settings Color KeyIP Setup Backup ConfigurationRestore Configuration Firmware UpgradeReboot ResetSystem Access Initialize, keep IP settingUser Summary Create UserModify User Remove UserSetup System NameSystem Time Configuring VLANs Snmp AddSnmp Remove Vlan Setup Screen Modify VlanModify Port RenameRemove Port DetailSample Vlan Configurations Forwarding Tagged/Untagged FramesVlan Detail Setting Up Two VLANs on the Same Switch Setting Up Vlan Across Two SwitchesTagged Vlan Configuration Spanning TreeSummary Spanning Tree Summary ScreenPort Setup Spanning Tree Setup ScreenSpanning Tree Port Setup Screen Igmp Snooping & QueryBroadcast Storm Broadcast Storm Summary ScreenQoS VoIP Traffic Settings ModifyQoS VoIP Setup Screen OUI Summary OUI AddPoE 3CBLSF26-PWR only QoS OUI Modify ScreenConfiguring Port Settings AdministrationPort Administration Summary Screen DetailPort Administration Setup Screen Speed/Duplex for 1000 Mbps ConnectionsLink Aggregation Guidelines for Creating TrunksCreate Link Aggregation Summary ScreenUse the Remove tab to delete a link aggregation group Security StatisticsRadius Client 802.1X Settings Configure802.1X Summary Screen Monitoring Address TablePort Mirroring Port SummaryUse the Setup tab to create a port mirror session Cable Diagnostics Cable Diagnostic Summary ScreenDiagnostics Cable Diagnostic ScreenConfiguring the Switch from the WEB Interface Troubleshooting Resetting to Factory DefaultsSolving LED Issues Forgotten Static IP AddressFiber cable is connected, but the Module Active LED is off If the Problem Persists Link/Activity LED is on, but network performance is poorAll ports appear to show continual activity Troubleshooting Purchase Value-Added Services Troubleshoot Online Access Software DownloadsRegister Your Product Telephone Technical Support and Repair Contact UsCountry Telephone Number Latsupportanc@3com.com Physical 3CBLSF26 Related StandardsEnvironmental Electrical3CBLSF26PWR Related Standards Physical 3CBLSF50 Related StandardsEnvironmental ElectricalAppendix B Technical Information PIN-OUTS Console CableNull Modem Cable PC-AT Serial CableModem Cable Ethernet Port RJ-45 Pin Assignments Pin Number 10/100 1000Appendix C PIN-OUTS Getting Started with the Command Line Interface Console PortLogging on to the CLI CLI Commands Automatic LogoutConcurrent CLI Sessions Syntax Default Configuration Ping ParametersIpSetup 255.255.255.0Upgrade Following example resets the Switch to factory defaults InitializePassword LogoutRegulatory Notices 100 1000BASE-T Auto-negotiationBandwidth Category 5e Cables Category 3 CablesCategory 5 Cables Category 6 CablesIeee 802.1D Full DuplexHalf Duplex Ieee 802.1QLink Aggregation Power over EthernetLayer MAC AddressSubnet Address SwitchServer Subnet MaskVlan Index NumbersIndex