Cabletron Systems 7000 manual SMT Version, Req. Requested Target Token Rotation Time

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FDDI Management

 

condition causes ring initialization to fail after the claim

 

and beacon recovery process. Like Non-Op-Dup, this

 

state will not occur unless you are using

 

locally-administered addresses.

Directed

The beacon process did not complete within 7 seconds.

 

The selected SMT has directed the controlled MAC to

 

send beacon frames to notify the other stations that a

 

serious problem exists on the ring, and a Trace state is

 

soon to follow.

Trace

A problem exists on the ring which could not be

 

corrected during the beaconing process, and a Trace has

 

been initiated. During a Trace (or Path Test), the SMT

 

sends a signal that forces its nearest upstream neighbor

 

to remove from the ring and conduct a self-test. If the

 

ring does not recover, each subsequent upstream station

 

will be forced to remove from the ring and conduct

 

self-tests until the problem has been corrected. While the

 

test is being conducted, ring management re-enters the

 

isolated state.

SMT Version

Displays the version number of the Station Management (SMT) entity. SMT provides the system management services for the FDDI protocols, including connection management, node conÞguration, error recovery, and management frame encoding. SMT frames have a version ID Þeld that identiÞes the structure of the SMT frame Info Þeld. The version number is included in the SMT frame so that a receiving station can determine whether or not its SMT version is able to communicate with the SMT version of another station. Knowing the version number allows the stations to handle version mismatches. Each FDDI station supports a range of SMT versions. The supported version range is identiÞed within the ietf-fddi MIB by two smtTable attributes: snmpFddiSMTLoVersionId and snmpFddiSMTHiVersionId. If a received frame is not within the supported version range, the frame is discarded.

T-Req. (Requested Target Token Rotation Time)

The token rotation time bid made by the selected SMT entity during ring initialization. Each station detecting that the ring must be initialized begins a claim token process and issues a stream of Claim Frames, which negotiate the value assigned to the Target Token Rotation Time (TTRT). The information Þeld of these frames contains the issuing stationÕs bid for the value of TTRT. Each claiming station inspects incoming Claim frames (from other issuing stations) and either continues its own bid (and removes the competing Claim Frame from the ring) or defers (halts transmission of its own bid and repeats the competing bid) according to the following hierarchy of arbitration:

¥A Claim Frame with the lowest TTRT bid has precedence.

¥If the values of TTRT are equal, the frame with the longest source address (48 vs. 16 bits) has precedence.

5-4

Configuration

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Contents SmartSwitch User’s Guide Page Virus Disclaimer Page Restricted Rights Notice Page Contents Chapter ATM Configuration Chapter Alarm ConfigurationChapter Fddi Management IndexIntroduction Introduction Using the SmartSwitch 7000 User’s Guide Related Manuals Software ConventionsCommon Window Fields Location Device NameIP Address MAC AddressUsing the Mouse Left Mouse Button Right Mouse ButtonUsing Window Buttons Using On-line HelpGetting Help SmartSwitch 7000 Firmware Getting Help from the Cabletron Systems Global Call CenterSmartSwitch Chassis View SmartSwitch 7000 Chassis View Viewing Chassis InformationSmartSwitch Chassis View Windows UpTime Front Panel InformationConnection Status Port StatusFirmware Boot PromMenu Structure TimeSmartSwitch 7000 Chassis View Menu Structure Device MenuPort Status Menu Fddi Menu Utilities MenuHelp Menu Board Menus Port MenusPort Status Displays Selecting a Port Status ViewStatus Errors LoadType Chassis Manager WindowSpeed Port Status Color CodesViewing Hardware Types Chassis Manager WindowDevice Type Module TypeViewing I/F Summary Information IndexLogical Status DescriptionPhysical Status Interface Performance Statistics/Bar GraphsRate Viewing Interface Detail AddressNon-Unicast ErrorUnicast DiscardedViewing Fddi Statistics Packets Transmitted Transmit onlyMaking Sense of Detail Statistics KBytes/sec Setting the Fddi Statistics Polling IntervalFrames/sec Peak KBytes/secUsing the Find Source Address Feature 11. Find Source Address WindowManaging the Hub Configuring PortsConfiguring Ethernet and Fddi Ports Standard Mode Full DuplexConfiguring Fast Ethernet Ports 13. Fast Ethernet ConÞguration Port Type Current Operational ModeDesired Operational Mode Link StateSetting the Desired Operational Mode Remote CapabilitiesFor 100Base-FX ports, options are COM Port Admin Configuring the COM PortsCOM Port Function Slip Speed SelectionSetting the Device Date and Time 16. Edit Date WindowEnabling and Disabling Ports Accessing the Statistics Window StatisticsRmon Statistics StatisticsDrop Events BytesPackets Packet TypeProblems Viewing Total, Delta, and Accumulated Statistics Frame Size Bytes PacketsPrinting Statistics Standard Print WindowInterface Statistics Interface Statistics Packets Transmitted Transmit only Statistics Alarm Configuration About Rmon Alarms and EventsBasic Alarm Configuration Alarm ConfigurationAccessing the Basic Alarm Configuration Window Rmon Basic Alarm ConÞguration WindowPort Number Viewing Alarm StatusKilobits Total Errors Broadcasts/Multicasts If NumberPolling Interval If TypeLog/Trap Rising ThresholdCreating and Editing a Basic Alarm Alarm Configuration Disabling a Basic Alarm Falling Thresholds Work,Viewing the Basic Alarm Log Advanced Alarm Configuration Accessing the Rmon Advanced Alarm/Event ListRmon Advanced Alarm/Event List Window Alarm Configuration Creating and Editing an Advanced Alarm To conÞgure an alarm TIP Alarm Configuration Table index.lengthin bytes.instancein decimal format Alarm Configuration Creating and Editing an Event Rmon Create/Edit Events Window TIP Alarm Configuration Adding Actions to an Event Alarm Configuration Deleting an Alarm, Event, or Action Viewing an Advanced Alarm Event LogHow Rising and Falling Thresholds Work Event Alarm Configuration How Rising and Falling Thresholds Work Fddi Management Configuration Fddi ManagementConcentrator ConÞguration Window MAC StateSMT Version Req. Requested Target Token Rotation TimeConcentrator Non-M Ports Neg. NegotiatedConcentrator M Ports Number of MACsConnection Policy Ring ConfigurationFddi Management 15 32,768 Ñ a permanently set value for this bit Address Mode Station ListNumber of Nodes Topology Stations PanelNode Class Upstream NeighborPerformance Receive Frames Frame ErrorsTransmit Frames Lost FramesAccessing the ATM Connections Window ATM ConfigurationConnection Data Settings VPIConfiguring Connections Adding a New ConnectionDeleting a Connection ATM Configuration Configuring Connections Symbols NumericsIndex-2 Index-3 Index Index-4