3Com 2226-SFP, 2250-SFP, 2426-PWR manual Link Aggregation, Guidelines for Creating Trunks

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1000 Mbps connections are always full-duplex. Half-duplex connections are only available for 10 Mbps and 100 Mbps settings.

CAUTION: Before manually setting a port to full-duplex, verify that the device connected to the port is also manually set to the same speed and duplex setting. If connecting link partners are left to autonegotiate for a link manually set on this switch to full-duplex, they will always negotiate to half-duplex, resulting in a duplex mismatch. This can result in a significant reduction in network performance. If you are unsure of how to configure the speed/duplex setting, simply enable autonegotiation for the port.

You cannot modify the speed/duplex settings of ports that are members of a trunk or aggregated link.

Supported SFP transceivers only operate at 1000 Mbps full-duplex. Inserting an SFP transceiver into a Gigabit port only disables the corresponding RJ-45 port when there is link on the SFP transceiver.

Disabling a port that is delivering power will not disable the power being delivered to a connected device.

Link Aggregation

Link aggregation, also called “trunking”, refers to bonding multiple ports into a single group to effectively combine the bandwidth into a single connection or a “trunk”. If you are connecting the Switch to another

Configuring Port Settings

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switch or to an Internet backbone, you can aggregate links on the Switch to increase throughput and prevent packet loopback between switches.

For link aggregation to work, the trunks must be configured on both ends (switches).

Four tabs are available on the Port Link Aggregation page:

■Summary

■Create

■Modify

■Remove

Guidelines for Creating Trunks

■Any port on the Switch can be used for creating a trunk.

■The Switch supports a maximum of four trunks.

■Each trunk may contain up to eight members.

■A port may only be a member of one trunk at any one time.

■All ports in a trunk must be configured in an identical manner, including communication mode (that is, speed, duplex mode and flow control).

■Both 10/100 and Gigabit ports cannot be combined as members in a single trunk.

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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 CommentsAutonegotiating 10/100 Mbps Ports Overview of the Baseline SwitchFeatures and Capabilities Autosensing of MDI/MDIX ConnectionsPhysical Features Power-over-Ethernet CapabilityGigabit 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 KitSupplying Power to the Switch Montagesatz AnweisungenPlacing Units On Top of Each Other Status Meaning Checking for Correct OperationUsing SFP Tranceivers Approved SFP TransceiversInserting 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 ViewColor Key Administration SettingsModifying the IP Address Settings Automatic IP ConfigurationBackup Configuration IP SetupFirmware Upgrade Restore ConfigurationInitialize, keep IP setting ResetSystem Access RebootCreate User User SummaryRemove User Modify UserSetup System NameSystem Time Configuring VLANs Snmp AddSnmp Remove Vlan Modify Vlan Setup ScreenRename Modify PortPort Detail RemoveSample Vlan Configurations Forwarding Tagged/Untagged FramesVlan 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 Security StatisticsRadius 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 TroubleshootingSolving LED Issues Forgotten Static IP AddressFiber cable is connected, but the Module Active LED is off If the Problem Persists Link/Activity LED is on, but network performance is poorAll ports appear to show continual activity Troubleshooting Purchase Value-Added Services Troubleshoot Online Access Software DownloadsRegister Your Product Contact Us Telephone Technical Support and RepairCountry Telephone Number Latsupportanc@3com.com Electrical 3CBLSF26 Related StandardsEnvironmental Physical3CBLSF26PWR Related Standards Electrical 3CBLSF50 Related StandardsEnvironmental PhysicalAppendix B Technical Information Console Cable PIN-OUTSNull Modem Cable PC-AT Serial CableModem Cable Pin Number 10/100 1000 Ethernet Port RJ-45 Pin AssignmentsAppendix C PIN-OUTS Getting Started with the Command Line Interface Console PortLogging on to the CLI CLI Commands Automatic LogoutConcurrent CLI Sessions Syntax Default Configuration Parameters Ping255.255.255.0 IpSetupUpgrade Initialize Following example resets the Switch to factory defaultsLogout PasswordRegulatory Notices 100 1000BASE-T Auto-negotiationBandwidth Category 6 Cables Category 3 CablesCategory 5 Cables Category 5e CablesIeee 802.1Q Full DuplexHalf Duplex Ieee 802.1DMAC Address Power over EthernetLayer Link AggregationSubnet Mask SwitchServer Subnet AddressVlan Numbers IndexIndex