3Com 3CR16708-91, 3CR16709-91 manual Solving Communication Problems, IP Addressing

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54CHAPTER 4: PROBLEM SOLVING

enough power subsequently becomes available the port will be powered.

Check that the port has not had a power limit imposed upon it.

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.

How do you obtain a registered IP Address?

The IP registration system ensures that every IP address used is unique; if you do not have a registered IP address, you may be using an identical address to someone else and your network will not operate correctly.

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Contents 3CR16708-91 3CR16709-91 3Com Corporation Campus Drive Marlborough, MA USA United States Government LegendContents Setting UP for Management Problem Solving OutsPage About this Guide Conventions Icon DescriptionConvention Description Related DocumentationDocumentation Comments Pddtechpubscomments@3com.comIntroducing Hardware Features Switch Switch Front View Detail Alert LED Power LED Port Status Leds PoE Status LedsSFP Module Status LED Switch 9 FX only 100BASE-FX Port Status LEDs Switch 9 FX onlyColor Indicates 10BASE-T/100BASE-TX Port Status LEDs LED Alert LEDSwitch Rear View Detail Switch 9 rear viewSwitch Rear View Detail Page Default Settings shows the default settings for the Switch Page Installing the Switch Package Contents Choosing a SuitableSite Air temperature around the Switch does not exceed 50 C 122 F Mounting Wall-mountingUpwards Instructions for Cement WallsInstructions for Wood Walls Make two holes 150 mm 5.9 in. apartPower and Alert LED colors Color StatePower-up Sequence Cross-over Cable Straight-through Cable SFP Operation Installing the Switch Inserting a SFP Transceiver Installing the Switch Setting UP for Management Automatically configured IP information Setting UpConfigure IP information manually for your Switch or view OverviewManual IP Configuration Automatic IP ConfigurationSetting UP for Management Manually Configuring IP Information Pre-requisitesConnecting the Workstation to the Switch Connecting a workstation to the Switch via the console portSetting Up the Switch with IP Information Example top-level command line interface menuConfigured IP ViewingAutomatically 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 Refer to Setting Up Web Interface Management onInterface Management Command LineNetwork Using Telnet CLI Management viaSetting Up Web InterfaceChoosing a Browser Over the Network Setting Up SnmpManagement Protocol Snmp can manage a Switch if Management workstationDefault Users User Default Name Password Access LevelDefault Users and Passwords Setting UP for Management Problem Solving Solving Problems Indicated by LEDsProblems Refer to the list of suggested solutions belowSolving Hardware Solving Communication Problems IP AddressingHow do you obtain a registered IP Address? Solving Software Upgrade Problems Problem Solving Safety Information Power Cord Set Japan Important Safety Information This must be approved for the country where it is usedImportant Safety Information ’information de Sécurité Importante Schko’information de Sécurité Importante Wichtige Sicherheitsinformationen Vorsicht EuropeInformación de seguridad importante Schuko Dispositivo Láser DE Clase Importanti Informazioni di Sicurezza CSAAvvertenza porte a fibre ottiche Protezione degli occhi Appendix a Safety Information Adapter Cable RJ-45 Pin Signal DB-9 Pin DirectionRJ-45 to RS-232 Panel. The pinout is shown belowAssignments ConnectorsRJ-45 Pin Pin NumberOfficeConnect Managed Switch 9 and Switch 9 FX Protocols Used for Administration Standards SupportedTerminal Emulation Product ServicesRegister Your PurchaseOnline Access SoftwareTroubleshoot DownloadsContact Us Country Telephone Number Latin America Telephone Technical Support and RepairUS and Canada Telephone Technical Support and Repair Index Snmp Regulatory Notices