3Com 3 manual Setting UP Virtual Lans

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8	SETTING UP VIRTUAL LANS

Setting up Virtual LANs (VLANs) on your Switch reduces the time and effort required by many network administration tasks, and increases the efficiency of your network.

This chapter explains more about the concept of VLANs and explains how they can be implemented on your Switch. It covers the following topics:

■What are VLANs?

■Benefits of VLANs

■VLANs and Your Switch

■VLAN Configuration Examples

For detailed descriptions of the web interface operations and the command line interface (CLI) commands that you require to manage the Switch please refer to the Management Interface Reference Guide supplied in HTML format on the CD-ROM that accompanies your Switch.

What are VLANs? A VLAN is a flexible group of devices that can be located anywhere in a network, but which communicate as if they are on the same physical segment. With VLANs, you can segment your network without being restricted by physical connections — a limitation of traditional network design. As an example, with VLANs you can segment your network according to:

■Departmental groups — For example, you can have one VLAN for the Marketing department, another for the Finance department, and another for the Development department.

■Hierarchical groups — For example, you can have one VLAN for directors, another for managers, and another for general staff.

■Usage groups — For example, you can have one VLAN for users of e-mail, and another for users of multimedia.

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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 List conventions that are used throughout this guide ConventionsDocumentation RelatedComments Pddtechpubscomments@3com.comRegistration ProductSwitch Features Page Switch Features What isManagement Software?Switch Features Overview For more information about multicast filtering, see Using Ports operating at 1000 Mbps only support full duplex modeDuplex Flow ControlResilience Features For more information about STP and RSTP, see UsingFor 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 Relevant multicast group Using Multicast FilteringUsing Multicast Filtering Snooping Mode Query modeQuery Mode That support IP Igmp v2 protocolIgmp 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 Using STP on a Default BehaviorNetwork with Multiple VLANsConfiguration that separates VLANs Using Resilience Features How Switch What is the SwitchDatabase? Database EntriesDatabases entries can have three states Switch Database Entry StatesPrioritization? What is TrafficAvailable Converged network applications Used by organizations with a802.1D Priority Levels How Traffic Prioritization Works Traffic Prioritization Your SwitchConfiguring traffic prioritization for QoS on a Switch How traffic is processed to provide Quality of ServiceUsing 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 Rmon SwitchLow 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 provide extra security VLANs ease the movement of devices on networksVLANs help to control traffic Creating an Ieee 802.1Q Tagged Link MembershipTwo Vlans connected via a router Using Untagged ConfigurationConfigure the VLANs ExamplesAdd endstation ports on Switch 1 to the VLANs Configure the VLANs on SwitchAdd ports to the VLANs Add endstation ports on Switch 2 to the VLANs Add port 12 on Switch 1 to the VLANsAdd port 11 on Switch 2 to the VLANs Check the Vlan membership for both switchesConfiguration Obtains IP How Your SwitchInformation How Automatic IPHow Automatic IP Configuration Works That a Switch may change its IP address whilst in use Automatic IP configuration featureConsiderations IP Addressing Configuration RulesGlossary IndexPage Configuration Rules for Gigabit Ethernet Configuration RulesFast Ethernet configuration rules Configuration Rules for Fast Ethernet Appendix a Configuration Rules This chapter contains the following sections NetworkSimple Network Segments are connected to the Switch which is positionedFamily and 4900 family can be used in your network ExampleDual Speed Hub Switch Improving Advanced NetworkResilience of Your NetworkPerformance EnhancingTherefore the overall network performance Simple Overview IP AddressesIP Address Obtaining a Registered IP AddressDecimal value of an octet whose bits are all 1s is Dotted Decimal NotationNetwork Portion Subnet mask Extending the Network Prefix Subnet Mask NumberingOr leave the field blank Glossary Glossary Ethernet EndstationEthernet address Fast EthernetHalf duplex GatewayHub Ieee 802.1DLine speed See baud Glossary Rstp See Rapid Spanning Tree Protocol STP See Spanning Tree Protocol STP Page Glossary Numbers IndexIgmp multicast filtering 30 Internet Addresses 85 InterNIC Sub-networks. See subnets Switch Database

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