3Com 3 manual Solving Communication Problems, IP Addressing

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Solving Communication Problems

55

problem, completely remove the SFP and replace it with a 3Com approved SFP. See “Approved SFP Transceivers” on page 26.

Error message indicating that the SFP transceiver is faulty.

To correct this problem, completely remove the SFP and then reinsert it.Alternatively, insert another identical SFP. If the problem persists, contact 3Com Technical Support.

Solving

Communication

Problems

If you experience communication problems with the Switch, ensure that:

The Switch IP address has been configured as described in Chapter 3

If the Switch is separated from your management application by a router, ensure that the default gateway IP address within the Switch is the same as the IP address of the router.

The Switch’s IP address has been entered correctly in your network management application (such as 3Com Network Supervisor).

The following is a brief overview of IP addressing, and how to obtain a registered IP address.

IP Addressing

To be managed correctly, each device on your network (for example a Switch or Hub) must have a unique IP address. IP addresses have the format n.n.n.n where n is a decimal number between 0 and 255. An example IP address is 192.168.100.8.

The IP address is split into two parts:

The first part (‘192.168.100’ in the example) identifies the network on which the device resides

The second part (‘.8’ in the example) identifies the device within the network

The natural subnet mask for this example is 255.255.255.0.

If your network has a connection to the external IP network, that is, you access the Internet, you must apply for a registered IP address.

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Contents SuperStack United States Government Legend 3Com Corporation 350 Campus Drive Marlborough, MAContents Setting UP for Management PIN-OUTS Page About this Guide Icon Description ConventionsConvention Description Documentation RelatedAbout this Guide Introducing Family About the SwitchFront View Detail Switch 4200 FamilyIntroducing the Superstack 3 Switch 4200 Family Unit LEDs Color Indicates Port Status LEDs 10BASE-T/100BASE-TX portsPort Status LEDs SFP ports Port Status LEDs 10/100/1000BASE-T portsRear View Detail LED Color Indicates Power/Self Test LEDAlert LED Quality of Service QoS Feature Switch 4200 Family Automatic IP ConfigurationDuplex Mode Rmon AlarmIntroducing the Superstack 3 Switch 4200 Family Installing the Switch Choosing a Suitable Package ContentsSite Rack-mounting Fitting a bracket for rack-mounting Repeat steps 2 and 3 for the other side of the SwitchTop of Each Other Placing Units OnStacking Units Sequence Power-upPowering-up Switch 4200 FamilySFP Operation SFP port on the Switch 4200 28-PortColor State Installing the Switch Transceiver Your SwitchChoosing Correct CablesCross-over Cable Straight-through Cable Fiber CablesChoosing the Correct Cables Installing the Switch Setting UP for Management Overview Setting UpConfigure IP information manually for your Switch or view Automatically configured IP informationAutomatic IP Configuration Manual IP ConfigurationSetting UP for Management Pre-requisites Manually Configuring IP InformationConfiguring the Workstation with IP Information Connecting the Workstation to the SwitchSetting Up the Switch with IP Information Using Command Line Interface via Telnet Example top-level command line interface menu Connecting a workstation to the Switch via the console port Setting Up the Switch with IP Information Example top-level command line interface menu Viewing Configured IPAutomatically Viewing Automatically Configured IP Information Viewing IP Information via the Console Port Methods of Managing a Switch Refer to Setting Up Command Line Interface Management on CLI Management via Command LineNetwork Using Telnet Interface ManagementInterface Setting Up WebChoosing a Browser Management workstation Setting Up SnmpManagement Protocol Snmp can manage a Switch if Over the NetworkUser Default Access Level Name Password Default UsersSecurity Device User Modify operation on the web interface Security device user modify command on the CLI, orSetting UP for Management For Technical Support information, see Appendix D Problem SolvingOn powering-up, the Power/Self Test LED lights yellow Solving ProblemsSolutions below Power LED does not lightError message indicating that the SFP transceiver is faulty Solving Communication ProblemsIP Addressing Solving Software Upgrade ProblemsSolving Stack FormationSafety Information This must be approved for the country where it is used Important Safety InformationImportant Safety Information ’information de Sécurité Importante Schko Wichtige Sicherheitsinformationen Vorsicht Europe Información de seguridad importante Schuko Importanti informazioni di sicurezza Avvertenza Lunità deve disporre di messa a terra Prodotto Laser Classe Pin to 9-pin Null Modem CablePC-AT Serial Cable Pin to RS-232 25-pinPin Number 10/100 1000 Modem CableRJ-45 Pin AssignmentsPin Number 10/100 1000 Appendix B PIN-OUTS Switch 4200 26-Port 3C17300A Switch 4200 50-Port 3C17302A Switch 4200 28-Port 3C17304A Appendix C Technical Specifications Purchase ServicesRegister Your ProductDownloads Access SoftwareTroubleshoot OnlineContact Us Latin America Telephone Technical Support and Repair Country Telephone NumberUS and Canada Telephone Technical Support and Repair Numbers IndexSFP ports 14 SFP transceiver Regulatory Notices
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