Cabletron Systems manual 9E312/9E423 Module Bridging

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9E312/9E423 Module Bridging

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.

The Filtering Database consists of two separate databases: the Static and the Learned Databases.

The Static Database contains addresses that are entered by a network administrator. You add these addresses directly to the database while the bridge is powered up, or to the 9E312/9E423 Module’s battery-backed RAM so that they are stored on shutdown till the next power-up.

The Learned Database consists of addresses that accumulate as part of the bridge’s learning process as it is up and running. These do not remain in the Source Address Table when the system is shut down. The Learned Database also contains the addresses that are in the Static Database upon start-up of the bridge.

Entries to the Source Address Table are one of four types: Permanent, Static, Dynamic, or Learned.

•Permanent entries are addresses that you add to the Static Database (via the Filtering Database window) that are stored in the 9E312/9E423 Module’s battery-backed RAM. Since they remain in the device on shutdown or restart, they are considered “Permanent.”

•Static entries are addresses that you add to the Static Database (via the Filtering Database window). These entries remain in the 9E312/9E423 Module until it is shut down.

•Dynamic entries are addresses that you add to the Static Database (via the Filtering Database window). With the Ageing Time feature, you set the time period that these addresses are saved in the Source Address Table. Addresses that have not transmitted a packet during one complete cycle of the ageing timer are deleted from the database.

•Learned entries are addresses that are added to the Learned Database through the bridge’s learning process. With the Ageing Time feature, you set the time period that these addresses are saved in the Source Address Table. Addresses which are inactive within a cycle of the ageing timer are dropped from the database.

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 9E312/9E423 Module port’s connected segment. Address entries classified as Self are those that have sent a frame with a destination address of one of the 9E312/9E423 Module’s bridging interfaces.

At the Filtering Database window (Figure 3-5), you can view the number of entries of each type: Permanent, Static, Dynamic, or Learned.

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Filtering Database

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Contents Page Virus Disclaimer Page Restricted Rights Notice Page Contents 9E312/9E423 Module Bridging IndexIntroduction Introduction Using the 9E312 and 9E423 User’s GuideRelated Manuals Common 9E312 and 9E423 Window Fields Software ConventionsUsing Buttons and Menus Getting Help Using On-line HelpGetting Help from Cabletron Systems Technical Support FTP 9E312 and 9E423 FirmwareIntroduction 9E312 and 9E423 Firmware 9E312/9E423 Module View 9E312/9E423 Module View Viewing Module InformationConnection Status Front Panel InformationMenu Structure Device Menu E312/9E423 Module View Menu StructureHelp Menu Utilities MenuBridge Menu Bridge Port Menu 9E312/9E423 Module Port Status DisplayChassis Manager Window Managing the Module Setting the Device Date and TimeViewing the Device Type Edit Time Window Enabling and Disabling Bridge Ports Using the Find Source Address FeatureFind Source Address Window Summary InformationDescription Interface Description FieldsIndex TypeRaw Counts Interface Performance Statistics/Bar GraphsLoad Interface Detail WindowRate Unicast Interface Detail Window StatisticsUnknown Protocol ErrorMulticast DiscardedMaking Sense of Interface Statistics Testing and Disabling the Current InterfacePackets Received Packets TransmittedUsing the Applications Pull-down menu 9E312/9E423 Module View Summary Information Bridging Basics 9E312/9E423 Module BridgingMore on Transparent Bridging An Overview of Remote Bridge ManagementBridge Status Window Bridge State on Interface Bridge Status Window Information FieldsInterface Address Interface TypeInterface Speed Bridge Statistics Enabling and Disabling BridgingPerformance Graphs Filtered Magenta Errors RedBridge Performance Graph Window Fields Frames Forwarded GreenConfiguring the Bridge Performance Graphs Interface Statistics WindowAddress Interface Statistics Window FieldsNon-Unicast Bridge Spanning Tree9E312/9E423 Module Bridging Bridge Level Fields Configuring the Bridge Spanning Tree WindowBridge Priority Protocol Root BridgeRoot Cost Root PortBridge Port Level Fields Designated Bridge Path CostDesignated Cost Designated RootChanging Bridge Priority Changing Bridge Spanning Tree ParametersChanging the Spanning Tree Algorithm Protocol Type Changing Hello Time Changing Forwarding Delay TimeChanging Max Age Time Changing Port Priority Filtering DatabaseChanging Path Cost 9E312/9E423 Module Bridging Filtering Database Window Capacity Filtering Database Window FieldsList NumberPort Filtering Configuring the Filtering DatabaseSource Port Receive PortChanging the Type of Entry Altering the Ageing TimeChanging the Receive Port Adding or Deleting Individual Entries Changing the Port Filtering ActionClearing All Permanent, Static, or Dynamic Entries Using Port Source AddressingDevice Ageing Time Window Setting the Ageing TimeDuplex Modes Window Duplex ModesInterface Duplex Modes Window FieldsFull Duplex Setting the Duplex Mode Index Index-2
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