3Com 3C16491 manual Igmp Snooping, Igmp Query, Broadcast Storm

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IGMP Snooping

This switch uses IGMP (Internet Group Management Protocol) to query for any attached hosts that want to receive a specific multicast service. It identifies the ports containing hosts requesting to join the service and sends data out to those ports only. It then propagates the service request up to any neighboring multicast switch/router to ensure that it will continue to receive the multicast service. This procedure is called multicast filtering.

The purpose of IP multicast filtering is to optimize a switched network’s performance, so multicast packets will only be forwarded to those ports containing multicast group hosts or multicast routers/switches, instead of flooding traffic to all ports in the subnet (VLAN).

Choose enable or disable from the IGMP

Snooping Mode drop down menu.

Configuring VLANs

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Figure 34 IGMP Snooping Setup Screen

IGMP Query

Choose enable or disable from the IGMP Query Mode drop down menu.

Figure 35 IGMP Query Setup Screen

Broadcast Storm

Use the Broadcast Storm page to set the Switch’s broadcast storm control and threshold limits.

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Contents 3C16491 Baseline Switch PWR Plus3Com Corporation 350 Campus Drive Marlborough MA USA Contents Snmp Regulatory Notices Glossary Index Page Conventions About this GuideProduct Registration Documentation CommentsAutonegotiating 10/100 Mbps Ports Overview of the Baseline SwitchFeatures and Capabilities Autosensing of MDI/MDIX ConnectionsFront Panel Physical FeaturesPower-over-Ethernet Capability Gigabit Combo Ports RJ-45/SFPGigabit Combo Ports RJ-45/SFP Link/Activity Status LEDs Rear Panel Power LEDPackage Contents Before You Begin Positioning the SwitchRack-Mounting or Free-Standing Using the Mounting KitPlacing Units On Top of Each Other Montagesatz AnweisungenChecking for Correct Operation Supplying Power to the SwitchUsing SFP Tranceivers Approved SFP TransceiversInserting an SFP Transceiver Inserting an SFP Transceiver Removing an SFP TransceiverPerforming Spot Checks Installing the Switch Running the Discovery Application Requirements for Accessing the Web InterfaceWelcome screen of Discovery appears Discovered Devices Screen Logging On to the Web InterfaceMenu Navigating the Web InterfaceLists the available items on the menu Menu Item Port Status ButtonsAccessing the Interface Without Using Discovery Dhcp Assigned IP AddressManually Assigned Static IP Address Device Summary Information Configuration OverviewPolling Interval Device ViewColor Key Administration SettingsModifying the IP Address Settings Automatic IP ConfigurationTo set the IP address for the Switch IP SetupRestore Configuration Backup ConfigurationUpgrade Screen Firmware UpgradeInitialize RebootUser Summary System AccessModify User Create UserRemove User System TimeSetup SummarySnmp Add Snmp Remove Configuring VLANsVlan Modify Port Modify VlanModify Port Screen RenameRemove Port DetailVlan Detail Forwarding Tagged/Untagged Frames Sample Vlan ConfigurationsSetting Up Vlan Across Two Switches Setting Up Two VLANs on the Same SwitchSpanning Tree Tagged Vlan ConfigurationSpanning Tree Screen Igmp Snooping Igmp QueryBroadcast Storm PoE Broadcast Storm Setup ScreenAdministration Configuring Port SettingsDetail Port Administration Summary ScreenSpeed/Duplex for 1000 Mbps Connections Port Administration Setup ScreenGuidelines for Creating Trunks Link AggregationLink Aggregation Summary Screen CreateLink Aggregation Modify Screen ModifySpanning Tree per Port Spanning Tree Summary Screen Port Mirroring Spanning Tree Setup ScreenStatistics Port Mirroring Setup ScreenQoS VoIP Summary Screen QoS VoIP Traffic SettingsQoS VoIP Setup Screen Port SetupOUI Add OUI SummaryRadius Client SecurityRadius Client Detail Screen Configure802.1X Summary Screen 802.1X Settings802.1X Detail Screen Address Table MonitoringAddress Table Screen Cable DiagnosticsCable Diagnostic Screen DiagnosticsResetting to Factory Defaults TroubleshootingForgotten Password Solving LED IssuesForgotten Static IP Address Link/Activity LED is on, but network performance is poor Fiber cable is connected, but the Module Active LED is offAll ports appear to show continual activity If the Problem PersistsPurchase Value-Added Services Troubleshoot Online Access Software DownloadsRegister Your Product Contact Us Telephone Technical Support and RepairCountry Telephone Number Latsupportanc@3com.com Electrical Related StandardsEnvironmental PhysicalAppendix B Technical Information Important Safety Information Safety InformationAppendix C Safety Information Regulatory Notices Page 1000BASE-T Auto-negotiationBandwidth Category 6 Cables Category 3 CablesCategory 5 Cables Category 5e CablesIeee 802.1Q Full DuplexHalf Duplex Ieee 802.1DNetwork LayerLink Aggregation MAC AddressSubnet Mask SwitchServer Subnet AddressVlan Numbers IndexIndex