Cabletron Systems 9E423, 9E312 manual Bridge Spanning Tree, Non-Unicast

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9E312/9E423 Module Bridging

Non-Unicast

Displays the number of packets transmitted to, or received from, this interface that had a source or destination address that is recognized by multiple devices on the network segment. The Non-Unicast ﬁeld includes a count of broadcast packets — those that are recognized by all devices on a segment, and multicast packets such as Bridge BPDUs — those that are recognized by a group of devices (but not necessarily all devices) on a segment. These statistics are displayed in the pie chart (color-coded dark blue).

Discarded

Displays the number of packets which were discarded even though no errors were detected to prevent transmission. One possible reason for discarding such a packet could be to free up buffer space.

Discarding good packets indicates a very busy network. If a device routinely discards packets, it usually means that network trafﬁc is overwhelming the device, perhaps because the device is performing poorly.

These statistics are displayed in the pie chart (color-coded magenta).

Error

Displays the number of packets received or transmitted that contained errors. These statistics are displayed in the pie chart (color-coded red).

Unknown Protocol

Displays the number of packets received which were discarded because of an unknown or unsupported protocol. The 9E312/9E423 Module switch interface will discard the packet and increment this counter if it can’t recognize the packet.

Packets Received

Displays the number of packets received by this interface.

Transmit Queue Size

The number of packets currently queued by the device for transmission from this interface. The amount of device memory devoted to buffer space, and the trafﬁc level on the target network, determine how large the output packet queue can grow before the device begins to discard packets.

Packets Transmitted

Displays the number of packets transmitted by this interface.

Bridge Spanning Tree

The Bridge Spanning Tree window allows you to display and modify the 9E312/9E423’s bridge port information and protocol parameters relating to the Spanning Tree Algorithm.

Bridge Spanning Tree

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Contents Page Virus Disclaimer Page Restricted Rights Notice Page Contents Index 9E312/9E423 Module BridgingIntroduction Using the 9E312 and 9E423 User’s Guide IntroductionRelated Manuals Software Conventions Common 9E312 and 9E423 Window FieldsUsing Buttons and Menus Getting Help Using On-line HelpGetting Help from Cabletron Systems Technical Support 9E312 and 9E423 Firmware FTPIntroduction 9E312 and 9E423 Firmware 9E312/9E423 Module View Viewing Module Information 9E312/9E423 Module ViewFront Panel Information Connection StatusMenu Structure E312/9E423 Module View Menu Structure Device MenuHelp Menu Utilities MenuBridge Menu 9E312/9E423 Module Port Status Display Bridge Port MenuChassis Manager Window Managing the Module Setting the Device Date and TimeViewing the Device Type Edit Time Window Using the Find Source Address Feature Enabling and Disabling Bridge PortsSummary Information Find Source Address WindowType Interface Description FieldsIndex DescriptionInterface Performance Statistics/Bar Graphs Raw CountsLoad Interface Detail WindowRate Interface Detail Window Statistics UnicastDiscarded ErrorMulticast Unknown ProtocolPackets Transmitted Testing and Disabling the Current InterfacePackets Received Making Sense of Interface StatisticsUsing the Applications Pull-down menu 9E312/9E423 Module View Summary Information 9E312/9E423 Module Bridging Bridging BasicsAn Overview of Remote Bridge Management More on Transparent BridgingBridge Status Window Bridge Status Window Information Fields Bridge State on InterfaceInterface Address Interface TypeInterface Speed Enabling and Disabling Bridging Bridge StatisticsPerformance Graphs Frames Forwarded Green Errors RedBridge Performance Graph Window Fields Filtered MagentaInterface Statistics Window Conﬁguring the Bridge Performance GraphsInterface Statistics Window Fields AddressBridge Spanning Tree Non-Unicast9E312/9E423 Module Bridging Bridge Level Fields Conﬁguring the Bridge Spanning Tree WindowBridge Priority Root Port Root BridgeRoot Cost ProtocolBridge Port Level Fields Designated Root Path CostDesignated Cost Designated BridgeChanging 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 Number Filtering Database Window FieldsList CapacityReceive Port Conﬁguring the Filtering DatabaseSource Port Port FilteringChanging the Type of Entry Altering the Ageing TimeChanging the Receive Port Changing the Port Filtering Action Adding or Deleting Individual EntriesUsing Port Source Addressing Clearing All Permanent, Static, or Dynamic EntriesSetting the Ageing Time Device Ageing Time WindowDuplex Modes Duplex Modes WindowInterface Duplex Modes Window FieldsFull Duplex Setting the Duplex Mode Index Index-2