Cabletron Systems 9H42X-XX manual Filtering Database, Dynamic, or Learned

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Bridging

Filtering Database

When the 9H42x-xx switch is using Transparent Bridging, the Filtering Database, which makes up the IEEE 802.1d Source Address Table, is used to determine which frames will be forwarded or filtered between the 9H42x-xx module’s bridging interfaces.

Transparent bridges like the 9H42x-xx use the Filtering Database to determine a packet’s route through the bridge. During initialization, a bridge copies the contents of its Permanent Database to the Filtering Database. Next, the bridge learns network addresses by entering the source address and port association of each received packet into the Filtering Database. When in the Forwarding state, the bridge examines each received packet and compares the destination address to the contents of the Filtering Database. If the destination address is located on the network from which the packet was received, the bridge filters (does not forward) the packet. If the destination address is located on a different network, the bridge forwards the packet to the appropriate network. If the destination address is not found in the Filtering Database, the bridge forwards the packet to all networks. To keep Filtering Database entries current, older entries are purged after a period of time, which is called the Dynamic Ageing Time.

Entries to the Source Address Table are one of four types: Static, Permanent,

Dynamic, or Learned.

•Static entries are addresses that you add to the Static Database (via the Filtering Database window). These entries are not subject to the ageing timer, and will remain in the Source Address Table until the 9H42x-xx module is shut down.

•Permanent entries are also addresses that you add to the Static Database (via the Filtering Database window); once classified as permanent, these are stored in the device’s battery-backed RAM and are preserved between power-up cycles.

•Dynamic entries are addresses that you add to the Static Database (via the Filtering Database window). These entries are subject to the Ageing Timer, and will be automatically deleted if they do not transmit data during one complete timer cycle. You can set the ageing timer via the Ageing Time field in the Filtering Database window.

•Learned entries are addresses that are added to the Learned Database through the bridge’s learning process. Like Dynamic entries, these entries are subject to the Ageing Timer, and will be automatically deleted if they do not transmit data during one complete timer cycle.

Learned address entries are divided into two types: Learned and Self. Address entries classified as Learned have transmitted frames destined for a device attached to a network segment installed in the 9H42x-xx module; address entries classified as Self are those that have sent a frame with a source address of one of the 9H42x-xx module’s available bridge port interfaces.

Filtering Database

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Contents Cabletron Systems Virus Disclaimer Page Restricted Rights Notice Page Contents Chapter Statistics Chapter BridgingIndex Contents Viii Introduction Introduction Using the 9H42x-xx User’s Guide Software Conventions Related ManualsCommon 9H42x-xx Window Fields Device Name IP AddressLocation MAC AddressUsing On-line Help Using ButtonsGetting Help 9H42x-xx Firmware Getting Help from Cabletron Systems’ Global Call CenterIntroduction 9H42x-xx Firmware 9H42x-xx Module View From an individual device iconViewing Module Information From the MMAC-Plus Chassis ViewFront Panel Information Connection StatusUp Time Port StatusBoot Prom Menu StructureFirmware TimeH42x-xx Module View Menu Structure Device MenuPort Status Menu Utilities MenuHelp Menu Bridge MenuPort Status Displays Port MenuSelecting a Port Status View StatusLoad ErrorsMapping Chassis Manager Window SpeedType Port Status Color CodesViewing the Device Type Chassis Manager Window To view the Chassis Manager windowUpTime Viewing I/F Summary InformationIndex Description StaInterface Performance Statistics/Bar Graphs Raw CountsRate Viewing Interface Detail AddressError UnicastNon-Unicast DiscardedPackets Transmitted Transmit only Using the Find Source Address FeatureMaking Sense of Detail Statistics Managing the Module Configuring PortsConfiguring Standard Ethernet Ports Standard ModeFull Duplex Configuring Fast Ethernet Ports Fast Ethernet ConfigurationCurrent Operational Mode Desired Operational ModePort Type Link StateAdvertised Abilities Remote CapabilitiesSetting the Desired Operational Mode Setting the Device Date and Time 10. Edit Time WindowEnabling and Disabling Ports 11. Edit Date WindowTo enable or disable bridging for an individual interface 9H42x-xx Module View Managing the Module Alarm Configuration About Rmon Alarms and EventsBasic Alarm Configuration Alarm ConfigurationAccessing the Basic Alarm Configuration Window Rmon Basic Alarm Configuration WindowViewing Alarm Status Kilobits Total Errors Broadcasts/MulticastsPort Number If NumberLog/Trap Polling IntervalRising Threshold Rising ActionCreating and Editing a Basic Alarm Alarm Configuration Alarm Configuration Disabling a Basic Alarm Viewing the Basic Alarm LogAlarm Configuration Advanced Alarm Configuration Accessing the Rmon Advanced Alarm/Event ListAlarm Configuration Such as the Hosts component, not present, or Creating and Editing an Advanced Alarm Rmon Create/Edit Alarms WindowAlarm Configuration Alarm Configuration Alarm Configuration Table index.lengthin bytes.instancein decimal format Alarm Configuration Creating and Editing an Event Rmon Create/Edit Events Window Alarm Configuration Adding Actions to an Event Rmon Create/Edit Actions Window Or deleted use the button to update the table at any time Deleting an Alarm, Event, or Action Viewing an Advanced Alarm Event LogHow Rising and Falling Thresholds Work Event Accessing the Statistics Windows StatisticsTot. Errors Rmon StatisticsProblems BytesPackets Drop EventsFrame Size Bytes Packets Viewing Total, Delta, and Accumulated Statistics Interface Statistics Printing StatisticsInterface Statistics Window Unicast Bridging Bridging BasicsAn Overview of Bridge Management More on Transparent BridgingBridge Status Window Spanning Tree State Bridge Address Interface TypeInterface Speed Enabling and Disabling All Installed Interfaces Enabling and Disabling BridgingEnabling and Disabling Individual Interfaces From the Bridge Status windowBridge Statistics Performance GraphsForwarded Green Total Errors Red Filtered MagentaXmitted Blue Configuring the Bridge Performance GraphsUsing Source Addressing Altering the Ageing TimeBridge Spanning Tree Viewing Spanning Tree Parameters Bridge Spanning Tree WindowBridge-level Parameters Bridge PriorityRoot Bridge Root CostForwarding Delay ProtocolHello Time Max AgePort-specific Parameters Changing Bridge Spanning Tree Parameters Designated PortTopology Changing Bridge PriorityChanging Hello Time Changing the Spanning Tree Algorithm Protocol TypeChanging Max Age Time Changing Port Priority Changing Forwarding Delay TimeChanging Path Cost Filtering Database Dynamic, or LearnedFiltering Database Window List NumberCapacity Ageing TimeConfiguring the Filtering Database Source PortReceive Port Port FilteringChanging the Type of Entry Changing the Receive PortChanging the Port Filtering Action Adding or Deleting Individual EntriesConfiguring Duplex Modes Clearing All Permanent, Static, or Dynamic EntriesTo access the Duplex Modes window Bridging Bridging Configuring Duplex Modes Index NumericsIndex-2 Index-3 Index Index-4

9H42X-XX specifications

Cabletron Systems 9H42X-XX is an advanced networking device recognized for its robust performance and reliability in various enterprise environments. Designed to meet the growing demands of data communication, this model serves as a vital component of network infrastructure, offering a myriad of features and technologies.

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In summary, the Cabletron Systems 9H42X-XX is a versatile networking solution that combines high-speed connectivity, security features, and ease of management within its robust architecture. Its adaptability and technical specifications position it as a reliable choice for enterprises looking to upgrade their network infrastructure and accommodate future growth.
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