3Com 3C16491 manual Forgotten Password, Forgotten Static IP Address, Solving LED Issues

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74CHAPTER 5: TROUBLESHOOTING

The Switch will perform automatic IP configu- ration after you reset it. See “Automatic IP Configuration” on page 33 for more informa- tion.

Forgotten Password

If you forget the password to the Web interface after you set it, you will need to reset the Switch to regain access. See “Resetting to Fac- tory Defaults” on page 73 for instructions.

After resetting the Switch, log on to the Web interface using the default admin account set- tings:

User name – admin

Password – blank (no password)

Forgotten Static IP Address

If you forget the static IP address that you assigned to the Switch and you need to access the Web interface, use the Discovery applica- tion to automatically detect the IP address and connect to the interface.

For information on using the Discovery application, refer to “Running the Discovery Application” on page 23.

Solving LED Issues

This section lists some issues that are related to the LEDs on the front panel of the Switch. For information on basic LED checks, refer to the following topics in Chapter 1:

(2) Gigabit Combo Ports (RJ-45/SFP)

(3) Link/Activity Status LEDs

(5) Power LED

A link is connected, but the Link/Activity LED for the port is off.

There is a problem with this connection. Verify that:

The device being connected to is powered on and operating correctly.

The cable is connected at both ends.

The cable is not damaged.

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Contents Baseline Switch PWR Plus 3C164913Com Corporation 350 Campus Drive Marlborough MA USA Contents Snmp Regulatory Notices Glossary Index Page About this Guide ConventionsDocumentation Comments Product RegistrationAutosensing of MDI/MDIX Connections Overview of the Baseline SwitchFeatures and Capabilities Autonegotiating 10/100 Mbps PortsGigabit Combo Ports RJ-45/SFP Physical FeaturesPower-over-Ethernet Capability Front PanelGigabit Combo Ports RJ-45/SFP Link/Activity Status LEDs Power LED Rear PanelPackage Contents Positioning the Switch Before You BeginUsing the Mounting Kit Rack-Mounting or Free-StandingMontagesatz Anweisungen Placing Units On Top of Each OtherSupplying Power to the Switch Checking for Correct OperationInserting an SFP Transceiver Using SFP TranceiversApproved SFP Transceivers Removing an SFP Transceiver Inserting an SFP TransceiverPerforming Spot Checks Installing the Switch Requirements for Accessing the Web Interface Running the Discovery ApplicationWelcome screen of Discovery appears Logging On to the Web Interface Discovered Devices ScreenNavigating the Web Interface MenuLists the available items on the menu Menu Item Buttons Port StatusManually Assigned Static IP Address Accessing the Interface Without Using DiscoveryDhcp Assigned IP Address Configuration Overview Device Summary InformationDevice View Polling IntervalAutomatic IP Configuration Administration SettingsModifying the IP Address Settings Color KeyIP Setup To set the IP address for the SwitchBackup Configuration Restore ConfigurationFirmware Upgrade Upgrade ScreenReboot InitializeSystem Access User SummaryCreate User Modify UserSystem Time Remove UserSnmp Add SetupSummary Configuring VLANs Snmp RemoveVlan Modify Vlan Modify PortRename Modify Port ScreenVlan Detail RemovePort Detail Sample Vlan Configurations Forwarding Tagged/Untagged FramesSetting Up Two VLANs on the Same Switch Setting Up Vlan Across Two SwitchesTagged Vlan Configuration Spanning TreeSpanning Tree Screen Broadcast Storm Igmp SnoopingIgmp Query Broadcast Storm Setup Screen PoEConfiguring Port Settings AdministrationPort Administration Summary Screen DetailPort Administration Setup Screen Speed/Duplex for 1000 Mbps ConnectionsLink Aggregation Guidelines for Creating TrunksCreate Link Aggregation Summary ScreenModify Link Aggregation Modify ScreenSpanning Tree per Port Spanning Tree Summary Screen Spanning Tree Setup Screen Port MirroringPort Mirroring Setup Screen StatisticsQoS VoIP Traffic Settings QoS VoIP Summary ScreenPort Setup QoS VoIP Setup ScreenOUI Summary OUI AddSecurity Radius ClientConfigure Radius Client Detail Screen802.1X Settings 802.1X Summary Screen802.1X Detail Screen Monitoring Address TableCable Diagnostics Address Table ScreenDiagnostics Cable Diagnostic ScreenTroubleshooting Resetting to Factory DefaultsForgotten Static IP Address Forgotten PasswordSolving LED Issues Fiber cable is connected, but the Module Active LED is off Link/Activity LED is on, but network performance is poorIf the Problem Persists All ports appear to show continual activityRegister Your Product Purchase Value-Added ServicesTroubleshoot Online Access Software Downloads Telephone Technical Support and Repair Contact UsCountry Telephone Number Latsupportanc@3com.com Physical Related StandardsEnvironmental ElectricalAppendix B Technical Information Safety Information Important Safety InformationAppendix C Safety Information Regulatory Notices Page Bandwidth 1000BASE-TAuto-negotiation Category 5e Cables Category 3 CablesCategory 5 Cables Category 6 CablesIeee 802.1D Full DuplexHalf Duplex Ieee 802.1QMAC Address LayerLink Aggregation NetworkSubnet Address SwitchServer Subnet MaskVlan Index NumbersIndex