Cabletron Systems TRMMIM manual Non-Isolating Errors, Abort Error, Internal Error

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Statistics

If a station receives an AMP or SMP MAC frame with the ARI and FCI bits set to 0 without first receiving an intervening AMP frame it recognizes that its upstream station failed to set the ARI/FCI bits.

The receiving station will increment an ARI/FCI set error counter, and end the ring poll process by not transmitting an SMP MAC frame. Since it has not received a valid SMP frame, it does not have a correct NAUN address. However, stations between the Active Monitor and the malfunctioning adapter will have correct NAUN addresses.

This error will not cause ring recovery functions to occur. You will probably not witness this error often, since it is associated with a station hardware problem rather than a “normal” disruption of ring activity. However, if you do note that a station’s adapter did not increment the ARI/FCI bits, you might assume that the adapter is failing or about to fail. You can isolate this error to the upstream adapter of the reporting station.

Abort Error

These occur when an adapter has frames to transmit and receives a token, but does not detect an ending delimiter on the token after its access control field. This indicates that the token is corrupted.

This error will cause the Active Monitor to detect a lost token (since it was not released back onto the ring) and to restore the ring through the ring purge process. This error is also somewhat uncommon, and will often indicate a failing adapter. A common cause of abort sequences is overheating by the adapter in an overloaded system. Note that the adapter may also issue an Internal Error simultaneously, which will cause the adapter to remove itself from the ring.

Internal Error

An internal error is counted when a station recognizes a recoverable internal error in its own adapter (and may temporarily remove itself from the ring). A large number of internal errors can indicate that one or more stations on the monitored ring are in marginal operating condition.

Non-Isolating Errors

Non-isolating errors are conditions that could have been caused by any station on the ring, thus their fault domain cannot be detected. Non-isolating errors include lost frames, congestion errors, frame copied errors, token errors and frequency errors.

Lost Frames

A lost frame error is counted each time a station’s TRR (Timer, Return to Repeat) timer expires before the frame it is transmitting returns. This timer, which is set to

4.1milliseconds, ensures that each station issues a new token after having transmitted data.

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Ring and Station Variables

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Contents Trmmim Page Virus Disclaimer Restricted Rights Notice Applicable to licenses to the United States Government onlyContents Chapter Ring Map Chapter Alarm ConfigurationChapter Statistics Chapter Ring Security Configuration Appendix a Trmmim MIB StructureContents Using the Trmmim User’s Guide TrmmimWhat’s not in the Trmmim Guide Introduction to Spma for the TrmmimConventions Screen DisplaysIntroduction to Spma for the Trmmim Using the Mouse ButtonGetting Help FTPTrmmim Firmware Introduction to Spma for the Trmmim Trmmim Firmware Using the Trmmim Hub View Using the Hub ViewUsing the Trmmim Hub View Navigating Through the Hub ViewHub View Front Panel Trmmim Hub ViewUptime Time and DateDevice Name Device LocationUsing the Trmmim Hub View Using the Mouse in a Hub View Module Module Index FNB Bypass State Hub View Port Color Codes Port Display FormErrors FramesTotal Bytes Port TypeFNB Display Monitoring Hub Performance Using the Trmmim Hub View Checking Device Status and Updating Front Panel Info Name and LocationChecking Module Status ContactDate and Time Total RingsSpeed Fault Speed Fault LocationModule Name ModuleAdmin State Checking Port StatusPort Name Module/PortLink State Time Checking Station StatusInsertion Trap Vendor Station NameUpstream Neighbor/Downstream Neighbor Physical Location PriorityPort Mapping Reverse MACsChecking Ring Port Status Configuring Station Name, Location, or PriorityFault State Time Media FaultClass Media TypeChecking Statistics Bytes LineBurst AbortManaging the Hub at the Device Level Managing the HubFind MAC Address Setting the Polling Intervals 12. The Find MAC Address Window13. Trmmim Polling Intervals Contact StatusDevice General Status Device ConfigurationPort Operational State StatisticsManaging the Hub at the Module Level Controlling Token Ring FNB Multiplexer ConnectionsINS Board Left ConnectRight Connect BypassControlling Token Ring Speed Clearing the Module FNB Configuration Window SelectionsControlling Token Ring MIM Management Mode Enabling All Ports on Token Ring ModulesAuto AUT Management MGTConverting a Station Port to a Ring-out Port Managing the Hub at the Port LevelEnabling and Disabling Station and Ring Ports Removing a Station from the Ring Ring Map From the command line stand-alone mode Launching the Ring MapFrom the icon From the Hub ViewSelecting a Ring to Map Ring NameRing Map Speed StationsName UtilizationViewing Station-specific Information Quick Info Popup WindowBoard and Port DropSetting a Station Name Performance and ErrorsSetting a Station Drop Viewing Management Station ConfigurationCommands Error Status Open StatusError Active MonitorError Report Timer Setting the Statistics Calculation ModeViewing Ring-level Information Viewing the Error Table Set Calculation Mode WindowError Table Window Total Errors Isolating ErrorsNon-Isolating Errors Changing the Station Labels Viewing Device Information Setting the Map Poll Interval Device Information WindowViewing Beacon History Active Monitor ChangesRing Purges Beacon EventsLongest Beacon Last Beacon TypeLast Beacon Beacon Configuration 12. The Beacon Configuration Window Using the Find Options Searching by Station Name, MAC Address, Board/Port, or Drop 13. Sample Find WindowsFinding the Active Monitor on the Network Finding the Management Station on the Network Frames or Errors measured/Δ Time in seconds Accessing Other Spma Applications 14. Sample Find Highest and Lowest WindowsAlarm Configuration Spmarun e5alarms IP address community name Setting and Viewing Ring Alarms Alarm Configuration Setting and Viewing Station Alarms Setting a Ring Level AlarmAlarm Configuration Alarm Configuration Alarm Configuration Setting a Station Level Alarm Alarm Configuration Setting and Viewing Station Alarms Using Statistics StatisticsViewing the Ring Station List Spmarun e5stats IP Address community nameModule and Port Stn NameUpstream Addr Downstream AddrMonitoring Ring and Station Statistics Using the Reverse MAC ButtonRefreshing the Station List Creating a Pie Chart Creating a Graph or Meter Click mouse button 1 on Ring and Station Variables GeneralProtocols KBytesIsolating Errors Line ErrorsBurst Error AC ErrorAbort Error Non-Isolating ErrorsInternal Error Token Errors Frequency ErrorsStatistics Ring and Station Variables Ring Security Configuration About Ring SecurityLaunching the Security Configuration Window Ring Security ConfigurationSecurity Configuration Ring Selection window, -1, will appear Allowed Station List Allowed CountDisallowed Station List Disallowed CountDisable Security Security Mode OptionsEnable Security Allowed/Disallowed List Configuration Buttons Configuring Security Building the Allowed List AutomaticallyDeleting Stations from the Allowed or Disallowed Lists Station Addition WindowClearing All Entries in the Allowed or Disallowed List Clear List WindowChanging the Ring Security Mode RemoveIetf MIB Support Trmmim MIB StructureChassis MGR Protocol StackSnmp Agent Network One, Network TwoBrief Word About MIB Components and Community Names TelnetTrmmim MIB Structure Index Index-2 Index-3 Index-4
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