3Com 3 manual Fast Ethernet configuration rules

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76APPENDIX A: CONFIGURATION RULES

Configuration Rules The topology rules for 100 Mbps Fast Ethernet are slightly different to

for Fast Ethernet those for 10 Mbps Ethernet. Figure 20 illustrates the key topology rules and provides examples of how they allow for large-scale Fast Ethernet networks.

Figure 20 Fast Ethernet configuration rules

The key topology rules are:

■Maximum UTP cable length is 100 m (328 ft) over Category 5 cable.

■A 412 m (1352 ft) fiber link is allowed for connecting switch-to-switch, or endstation-to-switch, using half-duplex 100BASE-FX.

■A total network span of 325 m (1066 ft) is allowed in single-repeater topologies (one hub stack per wiring closet with a fiber link to the

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Contents SuperStack 3Com Corporation 5400 Bayfront Plaza Santa Clara, California Contents Using Multicast Filtering Status Monitoring and Statistics IP Addressing About this Guide Conventions List conventions that are used throughout this guideRelated DocumentationComments Pddtechpubscomments@3com.comProduct RegistrationSwitch Features Page What is Switch FeaturesManagement Software?Switch Features Overview Ports operating at 1000 Mbps only support full duplex mode For more information about multicast filtering, see UsingDuplex Flow ControlFor more information about STP and RSTP, see Using Resilience FeaturesFor more information about Quality of Service, see Using Quality of ServiceEvent Notification For more information about VLANs, see Setting Up Virtual Port Features Ports operating at 1000 Mbps support full duplex mode only Port Features Switch units connected using an aggregated link Aggregated Links Traffic Distribution and Link Failure on Aggregated Links 2 Gbps aggregated link between two Switch units Optimizing Bandwidth Using Multicast Filtering Relevant multicast groupUsing Multicast Filtering Snooping Mode Query modeQuery Mode Igmp v2 protocol That support IPIgmp multicast filtering works as follows Enabling Igmp Multicast LearningIgmp Multicast Filtering Using Multicast Filtering Protocol STP Spanning TreeNetwork Ieee 802.1w standard What is STP? Traffic flowing through Bridge B Port Speed Link Type Path Cost 802.1D-1998 802.1w Using Resilience Features Port costs in a network Configuration 2 Redundancy through Meshed Backbone Configuration 1 Redundancy for Backbone LinkConfiguration 3 Redundancy for Cabling Error STP configurations Default Behavior Using STP on aNetwork with Multiple VLANsConfiguration that separates VLANs Using Resilience Features What is the Switch How SwitchDatabase? Database EntriesSwitch Database Entry States Databases entries can have three statesWhat is Traffic Prioritization?Available Converged network applications Used by organizations with a802.1D Priority Levels How Traffic Prioritization Works Your Switch Traffic PrioritizationHow traffic is processed to provide Quality of Service Configuring traffic prioritization for QoS on a SwitchUsing Traffic Prioritization Network efficiency and reduce the load on your network What is RMON?That allows you to monitor the traffic of LANs or VLANs Events AlarmsIt improves your efficiency Switch RmonLow Threshold Statistic High Threshold Recovery Period Low Threshold Statistic High Threshold Recovery Status Monitoring and Statistics Hardware Status Monitoring Example device summary web Setting UP Virtual Lans VLANs ease the movement of devices on networks VLANs provide extra securityVLANs help to control traffic Membership Creating an Ieee 802.1Q Tagged LinkTwo Vlans connected via a router Configuration Using UntaggedConfigure the VLANs ExamplesAdd endstation ports on Switch 1 to the VLANs Configure the VLANs on SwitchAdd ports to the VLANs Add port 12 on Switch 1 to the VLANs Add endstation ports on Switch 2 to the VLANsAdd port 11 on Switch 2 to the VLANs Check the Vlan membership for both switchesConfiguration How Your Switch Obtains IPInformation How Automatic IPHow Automatic IP Configuration Works That a Switch may change its IP address whilst in use Automatic IP configuration featureConsiderations Configuration Rules IP AddressingGlossary IndexPage Configuration Rules Configuration Rules for Gigabit EthernetFast Ethernet configuration rules Configuration Rules for Fast Ethernet Appendix a Configuration Rules Network This chapter contains the following sectionsSegments are connected to the Switch which is positioned Simple NetworkFamily and 4900 family can be used in your network ExampleDual Speed Hub Switch Advanced Network ImprovingResilience of Your NetworkPerformance EnhancingTherefore the overall network performance IP Addresses Simple OverviewObtaining a Registered IP Address IP AddressDecimal value of an octet whose bits are all 1s is Dotted Decimal NotationNetwork Portion Subnet mask Subnet Mask Numbering Extending the Network PrefixOr leave the field blank Glossary Glossary Endstation EthernetEthernet address Fast EthernetGateway Half duplexHub Ieee 802.1DLine speed See baud Glossary Rstp See Rapid Spanning Tree Protocol STP See Spanning Tree Protocol STP Page Glossary Index NumbersIgmp multicast filtering 30 Internet Addresses 85 InterNIC Sub-networks. See subnets Switch Database

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