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Cabletron Systems 100 manual Configuring BROADCAST/MULTICAST Storm Protection

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Conﬁguring Your ELS100-16TX

5.LCM prompts you to verify the new community name by retyping it.

6.Retype the new community name.

3.13CONFIGURING BROADCAST/MULTICAST STORM PROTECTION

The ELS100-16TX provides automatic protection against broadcast/multicast storms. Multicast storms are excessive broadcasts to all ports, typically caused by a malfunctioning device. They can result in severe network performance problems, including causing the network to crash.

To protect against broadcast/multicast storms, you must deﬁne an acceptable rate for multicast trafﬁc across a port. In many ways, this feature is similar to ﬁltering.

Each ELS100-16TX port can be individually conﬁgured for automatic multicast storm protection. You deﬁne what level of multicasts the ELS100-16TX will recognize as a multicast storm by specifying the number of multicast packets that can be transmitted within a given time period.

Note: LCM does not allow you to configure for multicast storm protection. You must use an SNMP-based NMS. See the documentation that came with your NMS for configuration instructions.

For example, if you conﬁgure ELS100-16TX to transmit onto Port 3 no more than ﬁve multicasts per 60 seconds, any multicasts destined for Port 3 are discarded after the ﬁrst ﬁve multicasts. After 60 seconds have elapsed, another ﬁve multicasts to Port 3 will be allowed. This maintains an effective maximum rate of ﬁve multicast packets per minute.

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Cabletron Systems 100 manual Configuring BROADCAST/MULTICAST Storm Protection

Contents

User Guide Page FCC Notice DOC Notice Cabletron Software Program License Declaration of Conformity Contents Monitoring and Managing Your ELS100-16TX ELS100-16TX Diagnostics TroubleshootingAppendix B Glossary Appendix a Technical SpecificationsContents Viii Chapter Introduction About this Manual Your email address Getting HelpDocument Conventions Related Documentation ELS100-16TX Front Panel OverviewSmartSTACK 100 ELS100-16TX Architecture Introduction Autonegotiation Port TrunkingDiscarding Local Trafﬁc Store and Forward SwitchingSpanning Tree Algorithm Typical Switching ApplicationSmartSTACK 100 ELS100-16TX Bridge Address Table SmartSTACK 100 ELS100-16TX Sample Applications SmartSTACK 100 ELS100-16TX Port MirroringSmartSTACK 100 ELS100-16TX Trunking SmartSTACK 100 ELS100-16TX Trunking with 100 Mbps Ports Virtual WorkgroupsRepeater Traffic Workgroup a Workgroup B Local Console Manager Command Syntax Conventions Help Basic LCM CommandsELS100-16TX Local Console Manager Traplog EraseExit or Logout Introduction ELS100-16TX Front Panel Chapter Unpacking and Installing Your ELS100-16TXPort LEDs 100BASE-T Epim Ports Reset Switch Status LEDs ACT Describes the ELS100-16TX buttons Installing AN EpimInstalling an Epim Rack-Mounting an ELS100-16TX Installing the ELS100-16TXAttaching Rackmount Brackets Connecting the Local Console Manager Checking the POWER-UP Diagnostics SequenceConnecting to the Network ELS100-16TX Twisted Pair Connection Connecting UTP CablesCable Pinouts RJ45 Crossover Cable Connecting a Segment to the EPIM-100FXFiber Optic Network Connection EPIM-100FX Port Unpacking and Installing Your ELS100-16TX Spectrum Spel Spma Chapter Configuring Your ELS100-16TXAssigning IP Addresses Type ipaddr PORT-NUMBER IP Address Changing a Subnet Mask Displaying IP AddressesDeleting an IP Address To change the subnet mask, at the LCM prompt Enabling BridgingDisplaying Bridging Functions Disabling BridgingEnabling Trunking 100BASE-T Crossover Cables Trunk GroupsTrunk Groups Disabling Trunking Display could look like the following Displaying Trunking StatusEnabled, Rip listening Disabling Mirroring Enabling Port MirroringDisplaying Mirroring Status To check the status for ports conﬁgured for mirroring Deﬁning Virtual Workgroups Defining and Deleting WorkgroupsLCM responds with the following display Assigning a Community Name Configuring BROADCAST/MULTICAST Storm Protection System Contact Modifying MIB VariablesCommunity Names System NameSystem Location Aging Parameter Set Community NameELS100-16TX Statistics Chapter Monitoring and Managing Your ELS100-16TXELS100-16TX Management Tools System Statistics Gathering StatisticsEthernet Port Statistics Displaying Status Using LCM to Check ELS100-16TX StatusEnabled, Rip listening Displaying MAC Addresses To display all MAC addresses, at the LCM prompt LCM would display Displaying Manufacturing InformationManaging the ELS100-16TX Using LCM to Manage the ELS100-16TXEnabling a Port Disabling a PortChanging a Subnet Mask NoRIP OptionChanging a Community Name Setting the Baud Rate Setting a Reboot Time Power-up LED Sequence Chapter ELS100-16TX Diagnostics and TroubleshootingPOWER-UP Diagnostics Software Checksum Comparison Speciﬁc Power-up TestsStatus and Activity Indicators Power-up Diagnostics ResultsResponses to Failures AT POWER-UP ELS100-16TX Front Panel LEDs ACT ELS100-16TX does not Power UP Troubleshooting3 ELS100-16TX Does Not Respond to NMS Connectivity Problems2 ELS100-16TX Has Rebooted ELS100-16TX Diagnostics and Troubleshooting Physical Connector PortsElectrical EnvironmentalStandard Support Diagnostic LEDsManagement Support Address Table SizeRegulatory Compliance Serial Cable PIN Assignments100BASE-T PIN Assignments ConnectorsCrossover Wiring STRAIGHT-THROUGH Wiring5 4 3 Rule EPIM-100FX SpecificationsCable Type Worst Case Budget Typical Budget Technical Speciﬁcations Address AlarmAddress table AgentBandwidth BackboneBpdu bridge protocol data unit Bps bits per secondData link layer CongestionDatagram Data rate or speedEncapsulation Full wire speedEncode EntityIcmp Internet control message protocol Intelligent bridge/switchIeee InitializationInteroperability InternetworkingIP Internet protocol ISO International Standards OrganizationMask MAC media access controlMbps megabits per second MIB management information basePropagation delay Power budgetOSI Open Systems Interconnection PacketService Rarp reverse address resolution protocolProtocol Protocol suiteSymbol SwitchSynchronous transmission Translating bridgeWAN wide area network UpstreamGlossary