Cabletron Systems 9E423, 9E312 Multicast, Discarded, Error, Unknown Protocol, Transmit Queue Size

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The 9E312/9E423 Module View

(ifOutUcastPkts) “The number of subnetwork unicast packets delivered to a higher-layer protocol.”

A unicast is a transmission sent to only one station. This ﬁeld displays the number of unicasts received from, or transmitted to, a higher-layer protocol.

Multicast

(ifInNUcastPkts) “The number of non-unicast (i.e., subnetwork-broadcast or subnetwork multi-cast) packets received from a higher-layer protocol.”

(ifOutNUcastPkts) “The number of non-unicast (i.e., subnetwork-broadcast or subnetwork multi-cast) packets delivered to a higher-layer protocol.”

A multicast is a transmission which is simultaneously sent to more than one station at a time. This ﬁeld displays the number of multicast packets (including broadcast packets) delivered to, or requested to be transmitted from, the higher- layer protocol.

Discarded

(ifInDiscards) “The number of inbound packets which were chosen to be discarded even though no errors had been detected to prevent their being transmitted. One possible reason for discarding such a packet could be to free up buffer space.”

(ifOutDiscards) “The number of inbound or outbound packets which were chosen to be discarded even though no errors had been detected to prevent their being deliverable. 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.

Error

(ifInErrors) “The number of inbound packets that contained errors preventing them from being deliverable to a higher-layer protocol.”

(ifOutErrors) “The number of outbound packets that could not be transmitted because of errors.”

A count of bad packets.

Unknown Protocol

(ifUnknownProtos) “The number of packets received via the interface which were discarded because of an unknown or unsupported protocol.”

A device discards a packet and increments this counter if it can’t recognize the packet. This statistic appears only in the Input Table.

Transmit Queue Size

(ifOutQLen) “The length of the output packet queue (in packets).”

I/F Summary Information

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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 from Cabletron Systems Technical Support Using On-line HelpGetting Help 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 MenuBridge Menu Utilities MenuHelp Menu 9E312/9E423 Module Port Status Display Bridge Port MenuChassis Manager Window Viewing the Device Type Setting the Device Date and TimeManaging the Module Edit Time Window Using the Find Source Address Feature Enabling and Disabling Bridge PortsSummary Information Find Source Address WindowInterface Description Fields IndexType DescriptionInterface Performance Statistics/Bar Graphs Raw CountsRate Interface Detail WindowLoad Interface Detail Window Statistics UnicastError MulticastDiscarded Unknown ProtocolTesting and Disabling the Current Interface Packets ReceivedPackets Transmitted 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 Speed Interface TypeInterface Address Enabling and Disabling Bridging Bridge StatisticsPerformance Graphs Errors Red Bridge Performance Graph Window FieldsFrames Forwarded Green Filtered MagentaInterface Statistics Window Conﬁguring the Bridge Performance GraphsInterface Statistics Window Fields AddressBridge Spanning Tree Non-Unicast9E312/9E423 Module Bridging Bridge Priority Conﬁguring the Bridge Spanning Tree WindowBridge Level Fields Root Bridge Root CostRoot Port ProtocolBridge Port Level Fields Path Cost Designated CostDesignated Root Designated BridgeChanging the Spanning Tree Algorithm Protocol Type Changing Bridge Spanning Tree ParametersChanging Bridge Priority Changing Max Age Time Changing Forwarding Delay TimeChanging Hello Time Changing Path Cost Filtering DatabaseChanging Port Priority 9E312/9E423 Module Bridging Filtering Database Window Filtering Database Window Fields ListNumber CapacityConﬁguring the Filtering Database Source PortReceive Port Port FilteringChanging the Receive Port Altering the Ageing TimeChanging the Type of Entry 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 WindowFull Duplex Duplex Modes Window FieldsInterface Setting the Duplex Mode Index Index-2