3Com 5112M-TPLS Understanding the General Rules, Basic Network Rules

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Understanding the General Rules

As part of your network design, it is important to consider your network size. For instance, is the network (end-to-end) 100 meters, 1000 meters, 4000 meters, or more? What are your plans for expansion? Your answers play a role in how you configure your network. For example, once the network expands beyond a certain size, you need to add a bridge or other internetworking device.

This section describes general rules for configuring an Ethernet network using fiber as the backbone medium. It also provides rules to ensure that your network configuration conforms to distance limitations imposed by Ethernet and networking equipment.

This section includes:

❑Basic Network Rules

❑LAN Equivalence

Basic Network Rules

This section outlines the basic network rules and 3Com’s recommendations for these rules. For more hardware-specific information on the 10-Port module, refer to Appendix A.

2 - 2 ONline 10BASE-T Security Module Installation and Operation Guide

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Contents Page VDE Class B Compliance Restricted Rights Page Contents Installing and Operating the Module Troubleshooting Appendix B Technical Support Figures Page Tables Page How to Use This Guide AudienceStructure of This Guide Document Conventions Convention Indicates ExampleUsr/snm/agents Related Documents 3Com Documents Reference DocumentsPage Introduction ONline 10BASE-T Security ModuleTheory of Operation ApplicationONline Management ONline 10BASE-T Security Module ApplicationPage Designing and Expanding the Network Understanding the General Rules Basic Network RulesSeven Basic Network Rules Rule Definition Recommendations/NotesCertain LAN devices Seven Basic Network Rules LAN Equivalence LAN Product Equivalent DistancesLAN Product Equivalent Fiber Fiber Backbone, Twisted Pair To-The-Desk Fiber Backbone, Twisted Pair To-The-Desk Example Sample Configuration Distance Calculation Twisted Pair Backbone, Twisted Pair To-The-Desk Maximum Link Distance on Twisted PairCable Gauge Supports Link Distances Up To Patch Panels Unshielded Twisted Pair NetworkRedundant Twisted Pair Configuration Redundant LinksDesigning and Expanding the Network 2 Page Installing and Operating the Module Precautionary Procedures Quick Installation ChartProcedures for Completing Installation Step Procedure ReferenceInstalling the Module Unpacking Procedures Setting the Dip Switch Security Module Dip Switch SW1 LocationDIP Switch SW1 Network Selection Settings Switch Network Selection Switch SettingsDIP Switch SW1 Security and Link Integrity Settings Switch Function Factory SettingOff On Installing the Module Installing the Cable Tie-Wrap KitAttaching the Tie-Wrap Bracket to the Module Attaching Cables With 90 Connectors Installing the Module Installing an ONline 10BASE-T Security ModuleONline 10BASE-T Security Module Cable Connection Configuring the Module Port Enable Network AssignmentPort Redundancy Link Integrity Module SecuritySaving Module Configurations Reverting Module ConfigurationsAutopartition Threshold Showing Module Configurations Show Module Show Module Verbose Show Port Show Port VerboseMonitoring the Front Panel Security Module Faceplate Interpretation of the Security Module LEDs Color State Indicates NameLED State Network Configuration LED and Network VerificationNetwork Check Codes Page Configuring Security Features Quick Reference for Configuring Security Quick Reference for Configuring the Security ModuleProcedure Command SET Security Autolearn Configuring Security Features Eavesdropping SecurityIntrusion Detection Example of Eavesdropping SecurityDefining Port Security Type Example of Intrusion DetectionDefining Port Action on Intrusion Configuring Autolearning Mask Enabling PortsConfiguring Autolearning Autolearn capture done learned 0 addresses total Defining a MAC Address Manually Downloading the Autolearning Database Configuring Security Mode Showing Security Configurations Saving Security ConfigurationsReverting Security Configurations Showing Port Configurations Eavesdrop None ETHERNET1 Showing Security Autolearn Showing Security Intruder List Clearing Security Configurations Clearing the MAC Address TableClearing the Autolearning Database Clearing the Security Intruder ListUsing 3Com MIB Security Variables EMM Security Snmp VariablesUsing the Security Module Snmp Variables Configuring Security Features 4 Page Troubleshooting TroubleshootingTroubleshooting Using the Status LEDs Troubleshooting Using the Port Status LEDsTroubleshooting Using the Port Status LEDs Troubleshooting Using the Activity LEDs Troubleshooting Using the Activity LEDsLED State Possible Problem Troubleshooting Solutions Technical Assistance Page Specifications Electrical SpecificationsEnvironmental Specifications Mechanical SpecificationsGeneral Specifications Pin Connector and Cable Figure A-1 -Pin Cable Male and Female Connectors Table A-1 -Pin Cable Pinouts and Port Assignments Hub Trans CeiverPort # Function PolarityTwisted Pair Connectors and Cables Hub TransHub Port #Twisted Pair Connectors Figure A-2. RJ-45 Connector PinoutsTwisted Pair Cables Technical Support On-line Technical SupportSupport from Your Network Supplier Email Technical SupportWorld Wide Web Site Support from 3Com Accessing the 3Com MIB Returning Products for Repair3Com Technical Publications Page Index Activity LEDs, 3-18,3-20 Quick Reference Chart Security Type Default Setting Index