HP J3177A, J3175A manual Switch Operation, Address Table Operation

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Switch 208/224 Description

Switch 208/224 Description

Switch Operation

Switch Operation

Address Table Operation

Address Learning. As devices are connected to the switch ports, either directly or through hubs or other switches that are connect to the switch, the MAC addresses of those devices are learned automatically and stored in the Switch 208/224’s 8000-entry address table. The switch also identifies the number of the port on which each address is learned so it knows the network location of each device.

Forwarding, Filtering, Flooding. When the switch receives a packet, it determines the destination address, looks for the address in the address table. Based on the port location of that address, the switch then determines whether to forward, filter-out, or flood the packet.

forward - if the destination address is on a different port than the one on which the packet was received, the packet is forwarded to the destination port and on to the destination device.

filter out - if the destination address is on the same port as the one on which the packet was received, the packet is filtered out. The switch thereby isolates local traffic so the rest of the network connected to the switch does not lose bandwidth dealing with unnecessary traffic.

flood - whenever a new destination address is found in a packet, the destination address will not yet be in the switch’s address table and the Switch 208/224 cannot know whether to forward or filter out the packet. In this case, it sends the packet to all the ports. This is referred to as “flooding”. When the destination device receives the packet, it replies, and the switch learns the new address from the reply packet. Then, all future packets destined for that address are forwarded or filtered out appropri- ately.

Network Moves and Changes. When devices are moved in the network, and become connected to a different switch port, the Switch 208/224 automat- ically recognizes the change and updates the address table with the new port location of the device. Communication with the device is automatically main- tained, without any address table manipulation being required.

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Contents HP AdvanceStack Switch 208/224 Page HP Customer Support Services How to get the latest software/agent firmwareHP FTP Library Service World Wide WebLocation Phone Number HP First Fax Retrieval ServiceAdditional HP Support Services HP AdvanceStack Switch 208/224 Installation and Reference GuidePublication Number Contents Index Installing the Switch 208/224 Installing the Switch 208/224Included Parts Installation StepsInstalling the Switch 208/224 Prepare the Installation Site Installation PrecautionsInstall Any Optional Modules Installing ModulesDo not install any 100VG transceiver modules in this slot Installing Transceivers100Base-T transceiver modules into the Switch 208/224 Verify the Switch’s Operation When the self test completes successfully LED BehaviorMount the Switch Mounting the Switch in a Rack or CabinetInsert a screw into the top hole of a close 0.5-inch Install additional screw Mounting the Switch on a Wall Mounting the Switch on a Horizontal SurfaceConnect the Switch to a Power Source Using RJ-45 Connectors 10 Mbit/s and 100 Mbit/s ports Connect the Network Cables100Base-T Xcvr Slot To connectSwitch 208/224 Condition Diagnostic Tip InstallingSample Network Topologies As a Segment SwitchSwitch 208T Server As a Desktop SwitchSwitch 224T PCs and peripherals Connecting to a Backbone Switch Fddi Campus Backbone Installing the Switch 208/224Switch Switch 224T Switch 208TWhere to Go From Here Cable ManagementSwitch 208/224 Description FeaturesNetwork Ports Front of the SwitchesSwitch 208/224 Description LEDs State MeaningManagement Module Features Management SlotBack of the Switches Power ConnectorsRedundant Power Supply RPS Connector Expansion SlotSwitch Operation Address Table OperationSimultaneous Network Communications Page Troubleshooting Solutions to Common ProblemsTroubleshooting Wrong network speed connected -- You have connected aLED Error Indications Diagnostic TipsTesting Twisted-Pair Cabling Diagnostic TestsTesting the Switch Testing End-to-End Network Communications Testing Switch-to-Device Network CommunicationsResetting the Switch HP BBSCables and Connectors Twisted-Pair Cable/Connector Pin-OutsCables and Connectors White/orange Fiber-Optic Cables Twisted-Pair Cable Pin AssignmentsTwisted-Pair Straight-Through Cable Twisted-Pair Cross-Over CableSpecifications PhysicalElectrical EnvironmentalConnectors SafetySpecifications ElectromagneticSafety and Regulatory Statements Mounting PrecautionsPower Precautions Safety and Regulatory StatementsServicing Safety InformationGrounding Informations concernant la sécurité Tible de causer des dommages à léquipementHinweise zur Sicherheit Considerazioni sulla sicurezza AttrezzatureConsideraciones sobre seguridad Resultar en averías al equipoSafety Information Japanese Regulatory Statements FCC Class a Statement for U.S.A. OnlyEuropean Community CanadaDeclaration of Conformity Index NumericsMounting switch on … 1-11 HP Redundant Power Supply RPS Rack Page Page 5966-5225