Cabletron Systems 9H42X-XX manual Protocol, Hello Time, Max Age, Forwarding Delay, Hold Time

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Bridging

Protocol

Displays the Spanning Tree Algorithm Protocol type the 9H42x-xx module is currently using. The choices are:

•802.1

•DEC (DEC Lanbridge 100)

•None

The following four fields display values used for various Spanning Tree timers in the course of normal operations. Three of these values — Hello Time, Max Age, and Forwarding Delay — are configurable; the values currently in use are those which have been set at the Root Bridge. Both the values currently in use and those which would be used if the monitored 9H42x-xx module were to become the root bridge are displayed in the upper-right corner of the window. Note that Hold Time is not configurable; this is a fixed value and cannot be changed.

Hello Time

This parameter indicates, in seconds, the length of time the Root Bridge (or bridge attempting to become the Root) waits before resending Configuration BPDUs. The range for this field is 1 to 10 seconds, with a default value of 2 seconds. The Root Bridge sets the Hello Time.

Max Age

This parameter displays the bridge’s BPDU ageing timer. This controls the maximum time a BPDU can be retained by the bridge before it is discarded. During normal operation, each bridge in the network receives a new Configuration BPDU before the timer expires. If the timer expires before a Configuration BPDU is received, it indicates that the former Root is no longer active. The remaining bridges begin Spanning Tree operation to select a new Root. The current Root Bridge on the network sets the Max Age time. The range for this field is 6 to 40 seconds, with a default value of 20 seconds.

Forwarding Delay

This parameter displays the time period which elapses between states while the bridge is moving to the Forwarding state. For example, while moving from a Blocking to a Forwarding state, the port first moves from Blocking to Listening to BPDU activity on the network, remains there for the Forward Delay period, then moves to the Learning State (and remains in it for the Forward Delay period), and finally moves into a Forwarding state. This timer is set by the Root Bridge. During a topology change, the Forward Delay is also used as the Filtering Database Aging Time (refer to Filtering Database, page 5-19), which ensures that the Filtering Database maintains current topology information.

Hold Time

This parameter displays, in seconds, the minimum time that can elapse between the transmission of Configuration BPDUs through a bridge port. The Hold Time ensures that Configuration BPDUs are not transmitted too frequently through any bridge port. Receiving a BPDU starts the Hold Timer. After the Hold Timer

5-14

Bridge Spanning Tree

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Contents Cabletron Systems Virus Disclaimer Page Restricted Rights Notice Page Contents Chapter Bridging Chapter StatisticsIndex Contents Viii Introduction Introduction Using the 9H42x-xx User’s Guide Common 9H42x-xx Window Fields Related ManualsSoftware Conventions MAC Address Device NameIP Address LocationGetting Help Using ButtonsUsing On-line Help Getting Help from Cabletron Systems’ Global Call Center 9H42x-xx FirmwareIntroduction 9H42x-xx Firmware From an individual device icon 9H42x-xx Module ViewFrom the MMAC-Plus Chassis View Viewing Module InformationPort Status Front Panel InformationConnection Status Up TimeTime Boot PromMenu Structure FirmwareDevice Menu H42x-xx Module View Menu StructureUtilities Menu Port Status MenuBridge Menu Help MenuPort Menu Port Status DisplaysStatus Selecting a Port Status ViewMapping ErrorsLoad Port Status Color Codes Chassis Manager WindowSpeed TypeChassis Manager Window To view the Chassis Manager window Viewing the Device TypeIndex Viewing I/F Summary InformationUpTime Raw Counts DescriptionSta Interface Performance Statistics/Bar GraphsRate Address Viewing Interface DetailDiscarded ErrorUnicast Non-UnicastMaking Sense of Detail Statistics Using the Find Source Address FeaturePackets Transmitted Transmit only Configuring Ports Managing the ModuleFull Duplex Standard ModeConfiguring Standard Ethernet Ports Fast Ethernet Configuration Configuring Fast Ethernet PortsLink State Current Operational ModeDesired Operational Mode Port TypeRemote Capabilities Advertised AbilitiesSetting the Desired Operational Mode 10. Edit Time Window Setting the Device Date and Time11. Edit Date Window Enabling and Disabling PortsTo enable or disable bridging for an individual interface 9H42x-xx Module View Managing the Module About Rmon Alarms and Events Alarm ConfigurationAlarm Configuration Basic Alarm ConfigurationRmon Basic Alarm Configuration Window Accessing the Basic Alarm Configuration WindowIf Number Viewing Alarm StatusKilobits Total Errors Broadcasts/Multicasts Port NumberRising Action Log/TrapPolling Interval Rising ThresholdCreating and Editing a Basic Alarm Alarm Configuration Alarm Configuration Viewing the Basic Alarm Log Disabling a Basic AlarmAlarm Configuration Accessing the Rmon Advanced Alarm/Event List Advanced Alarm ConfigurationAlarm Configuration Such as the Hosts component, not present, or Rmon Create/Edit Alarms Window Creating and Editing an Advanced AlarmAlarm Configuration Alarm Configuration Alarm Configuration Table index.lengthin bytes.instancein decimal format Alarm Configuration Creating and Editing an Event Rmon Create/Edit Events Window Alarm Configuration Adding Actions to an Event Rmon Create/Edit Actions Window Or deleted use the button to update the table at any time Viewing an Advanced Alarm Event Log Deleting an Alarm, Event, or ActionHow Rising and Falling Thresholds Work Event Statistics Accessing the Statistics WindowsRmon Statistics Tot. ErrorsDrop Events ProblemsBytes PacketsFrame Size Bytes Packets Viewing Total, Delta, and Accumulated Statistics Printing Statistics Interface StatisticsInterface Statistics Window Unicast Bridging Basics BridgingMore on Transparent Bridging An Overview of Bridge ManagementBridge Status Window Spanning Tree State Interface Speed Interface TypeBridge Address From the Bridge Status window Enabling and Disabling All Installed InterfacesEnabling and Disabling Bridging Enabling and Disabling Individual InterfacesPerformance Graphs Bridge StatisticsForwarded Green Configuring the Bridge Performance Graphs Total Errors RedFiltered Magenta Xmitted BlueAltering the Ageing Time Using Source AddressingBridge Spanning Tree Bridge Spanning Tree Window Viewing Spanning Tree ParametersRoot Cost Bridge-level ParametersBridge Priority Root BridgeMax Age Forwarding DelayProtocol Hello TimePort-specific Parameters Changing Bridge Priority Changing Bridge Spanning Tree ParametersDesignated Port TopologyChanging Max Age Time Changing the Spanning Tree Algorithm Protocol TypeChanging Hello Time Changing Path Cost Changing Forwarding Delay TimeChanging Port Priority Dynamic, or Learned Filtering DatabaseFiltering Database Window Ageing Time ListNumber CapacityPort Filtering Configuring the Filtering DatabaseSource Port Receive PortChanging the Receive Port Changing the Type of EntryAdding or Deleting Individual Entries Changing the Port Filtering ActionClearing All Permanent, Static, or Dynamic Entries Configuring Duplex ModesTo access the Duplex Modes window Bridging Bridging Configuring Duplex Modes Numerics IndexIndex-2 Index-3 Index Index-4

9H42X-XX specifications

Cabletron Systems 9H42X-XX is an advanced networking device recognized for its robust performance and reliability in various enterprise environments. Designed to meet the growing demands of data communication, this model serves as a vital component of network infrastructure, offering a myriad of features and technologies.

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In summary, the Cabletron Systems 9H42X-XX is a versatile networking solution that combines high-speed connectivity, security features, and ease of management within its robust architecture. Its adaptability and technical specifications position it as a reliable choice for enterprises looking to upgrade their network infrastructure and accommodate future growth.
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