3Com 2250-SFP manual Forwarding Tagged/Untagged Frames, Sample Vlan Configurations, Vlan Detail

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VLAN Detail

Use this screen to display detailed VLAN information.

1Enter a set of VLANs or select all VLANs to add to the details list, then click Select.

2From the drop down menu, choose a VLAN to display the associated tagged and untagged member ports.

Figure 37 VLAN Detail Screen

Forwarding Tagged/Untagged Frames

Each port on the Switch is capable of passing tagged or untagged frames.

The following describes how the Switch will handle tagged and untagged frames.

Configuring VLANs

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■When a port receives a tagged frame with a VLAN ID and the port is a member (untagged or tagged) of that VLAN, the frame is accepted. Otherwise the if the port is not a member of that VLAN, the frame is discarded.

■When a port receives an untagged frame and the port is an untagged member of a VLAN, the frame is accepted and assigned to that VLAN ID. Otherwise if the port is not an untagged member of any VLAN, the frame is discarded.

The Switch will only forward a frame to ports that are members (tagged or untagged) of the VLAN to which the frame is assigned. If the port is an untagged member, the egress frame will be stripped of the VLAN tag and forwarded as untagged. However, if the port is a tagged member, the egress frame is forwarded as tagged.

Sample VLAN Configurations

To illustrate how you can segment network devices that are connected to the Switch, the following sample configurations are provided.

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Contents Installation and User Guide 3Com Corporation 350 Campus Drive Marlborough MA Contents Snmp 3COM CLI Reference Guide Page Conventions About this GuideProduct Registration Documentation CommentsFeatures and Capabilities Overview of the Baseline SwitchAutosensing of MDI/MDIX Connections Autonegotiating 10/100 Mbps PortsPower-over-Ethernet Capability Physical FeaturesGigabit Combo Ports RJ-45/SFP RJ-45 10/100 Ports Front PanelGigabit Combo Ports RJ-45/SFP 10/100BASE-TX Link/Activity Status LEDs SFP Mode Rear Panel Power LEDPackage Contents Important Safety Information Installing the SwitchImportante Avviso di Sicurezza Positioning the SwitchRack-Mounting or Free-Standing Using the Mounting KitMontagesatz Anweisungen Supplying Power to the SwitchPlacing Units On Top of Each Other Status Meaning Checking for Correct OperationApproved SFP Transceivers Using SFP TranceiversInserting an SFP Transceiver Removing an SFP Transceiver Performing Spot ChecksRefer to Troubleshooting on Using the Console Command Line Interface CLI Requirements for Accessing the Web InterfaceCLI Summary with Default IP Address CLI Summary with Assigned IP Address Logging On to the Web InterfaceMenu Navigating the Web InterfaceMenu Item Description Snmp Port Status Buttons3Com Switch Detect Welcome Screen Running the 3Com Switch Detect Application3Com Switch Detect Search Screen Connecting to the WEB Interface Device Summary Information Configuration OverviewPolling Interval Device ViewModifying the IP Address Settings Administration SettingsAutomatic IP Configuration Color KeyBackup Configuration IP SetupFirmware Upgrade Restore ConfigurationSystem Access ResetReboot Initialize, keep IP settingCreate User User SummaryRemove User Modify UserSystem Name SetupSystem Time Snmp Add Configuring VLANsSnmp Remove Vlan Modify Vlan Setup ScreenRename Modify PortPort Detail RemoveForwarding Tagged/Untagged Frames Sample Vlan ConfigurationsVlan Detail Setting Up Vlan Across Two Switches Setting Up Two VLANs on the Same SwitchSpanning Tree Tagged Vlan ConfigurationSpanning Tree Summary Screen SummarySpanning Tree Setup Screen Port SetupIgmp Snooping & Query Spanning Tree Port Setup ScreenBroadcast Storm Summary Screen Broadcast StormModify QoS VoIP Traffic SettingsQoS VoIP Setup Screen OUI Add OUI SummaryQoS OUI Modify Screen PoE 3CBLSF26-PWR onlyAdministration Configuring Port SettingsDetail Port Administration Summary ScreenSpeed/Duplex for 1000 Mbps Connections Port Administration Setup ScreenGuidelines for Creating Trunks Link AggregationLink Aggregation Summary Screen CreateUse the Remove tab to delete a link aggregation group Statistics SecurityRadius Client Configure 802.1X Settings802.1X Summary Screen Address Table MonitoringPort Summary Port MirroringUse the Setup tab to create a port mirror session Cable Diagnostic Summary Screen Cable DiagnosticsCable Diagnostic Screen DiagnosticsConfiguring the Switch from the WEB Interface Resetting to Factory Defaults TroubleshootingForgotten Static IP Address Solving LED IssuesFiber cable is connected, but the Module Active LED is off Link/Activity LED is on, but network performance is poor If the Problem PersistsAll ports appear to show continual activity Troubleshooting Troubleshoot Online Access Software Downloads Purchase Value-Added ServicesRegister Your Product Contact Us Telephone Technical Support and RepairCountry Telephone Number Latsupportanc@3com.com Environmental 3CBLSF26 Related StandardsPhysical Electrical3CBLSF26PWR Related Standards Environmental 3CBLSF50 Related StandardsPhysical ElectricalAppendix B Technical Information Console Cable PIN-OUTSPC-AT Serial Cable Null Modem CableModem Cable Pin Number 10/100 1000 Ethernet Port RJ-45 Pin AssignmentsAppendix C PIN-OUTS Console Port Getting Started with the Command Line InterfaceLogging on to the CLI Automatic Logout CLI CommandsConcurrent CLI Sessions Syntax Default Configuration Parameters Ping255.255.255.0 IpSetupUpgrade Initialize Following example resets the Switch to factory defaultsLogout PasswordRegulatory Notices 100 Auto-negotiation 1000BASE-TBandwidth Category 5 Cables Category 3 CablesCategory 5e Cables Category 6 CablesHalf Duplex Full DuplexIeee 802.1D Ieee 802.1QLayer Power over EthernetLink Aggregation MAC AddressServer SwitchSubnet Address Subnet MaskVlan Numbers IndexIndex