Cabletron Systems 9A128-01 manual SMT Version, Req. Requested Target Token Rotation Time

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FDDI Management

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 configuration, error recovery, and management frame encoding. SMT frames have a version ID field that identifies the structure of the SMT frame Info field. 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 identified 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 field of these frames contains the issuing station’s 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.

•If both TTRT value and source address length are equal, the frame with the highest address has precedence.

The 9A128-01 is shipped with a T-Req = 83 msec (earlier versions of firmware) or 6 msec (later firmware versions). T-Req is stored within the MIB in units of nanoseconds (one billionth of a second) rather than milliseconds (one thousandth of a second); SPECTRUM Element Manager converts nanoseconds to milliseconds for display purposes. You can use any SNMP Set Request tool to edit the T-Req value; just remember that you must enter your value in nanoseconds, rather than milliseconds.

T-Neg. (Negotiated)

The winning time negotiated in the ring initialization sequence.

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Configuration

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Contents Cabletron Systems Virus Disclaimer Page Restricted Rights Notice Page Contents Chapter Fddi Management Chapter BridgingIndex Introduction Using This GuideRelated Reading Common Window Fields Software ConventionsDevice Name IP AddressUsing On-line Help Using ButtonsGetting Help LocationFTP Getting Help from the Cabletron Systems Global Call CenterFirmware Versions Supported 9A128-01 Module View Front Panel Information Viewing Module InformationConnection Status Boot PromUpTime Port StatusMenu Structure TimeDate Device Menu A128-01 Module View Menu StructurePort Status Menu Utilities Menu Fddi MenuHelp Menu Board MenusPort Menus Port Status DisplaysBridge Port Status Displays Selecting a Port Status ViewBridge Mapping Bridge Port StateBridge Port Status Color Codes Fddi Port Status DisplaysLER Estimate Connection StateFddi Port Status Color Codes Chassis Manager WindowViewing Hardware Types Device TypeModule Type Module Type Window Viewing I/F Summary InformationDescription IndexSta Interface Performance Statistics/Bar GraphsLoad Raw CountsInterface Statistics Window RateAddress ErrorUnicast Non-UnicastPackets Received Received only Using the Find Source Address FeatureTransmit Queue Size Transmit only Packets Transmitted Transmit onlyManaging the Hub Setting the Device Date and TimeBridge Ports Enabling and Disabling PortsModule Ports ATM Configuration Accessing the ATM Connections WindowConnection Data ATM ConfigurationVPI SettingsAdding a New Connection Configuring ConnectionsDeleting a Connection ATM Configuration Configuring Connections Fddi Management Fddi Management ConfigurationMAC State SMT Version Req. Requested Target Token Rotation TimeNeg. Negotiated Concentrator Non-M Ports Concentrator M PortsNumber of MACs MAC PathConnection Policy 15 32,768 a permanently set value for this bit Address Mode Station ListNumber of Nodes Node Class Stations PanelTopology Upstream NeighborPerformance Transmit Frames Frame ErrorsReceive Frames Lost FramesFddi Management Performance Bridging Bridging Bridge Status WindowBridge State on Interface Up TimeInterface Type Bridge AddressConfiguring Duplex Modes Enabling and Disabling Bridging Performance Graphs Bridge StatisticsForwarded Green Filtered Magenta Total Errors RedXmitted Blue Configuring the Bridge Performance GraphsForwarded ErrorsFiltered XmittedInterface Statistics Window Forwarded toForwarded from Description Using Source Addressing Port Source Addresses Window Setting the Ageing TimeBridge Spanning Tree Bridge Priority Configuring the Bridge Spanning Tree WindowRoot Cost Root BridgeRoot Port ProtocolHello Time Forwarding DelayMax Age Hold TimeChanging Bridge Spanning Tree Parameters Changing Bridge Priority Changing the Spanning Tree Algorithm Protocol TypeChanging Hello Time Changing Forwarding Delay Time Changing Max Age TimeChanging Port Priority Changing Path Cost Filtering DatabaseBridging Bridging Number ListCapacity Ageing TimeConfiguring the Filtering Database Receive PortPort Filtering Changing the Type of Entry Altering the Ageing TimeChanging the Receive Port Changing the Port Filtering ActionClearing All Permanent, Static, or Dynamic Entries Bridging Filtering Database Index Index-2 Index-3 Index Index-4
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