Cabletron Systems 9E312, 9E423 manual Changing Hello Time, Changing Max Age Time

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9E312/9E423 Module Bridging

If your bridge is not in a parallel conﬁguration, you should disable Spanning Tree at the

TIP bridge by turning it to None to reduce bandwidth consumption. Remember, Spanning Tree causes BDPU trafﬁc to be propagated on the network by the bridge — even though there are no other bridges on the segment to receive those BPDUs.

Changing Hello Time

If the bridge is the Root Bridge, or is attempting to become the Root, and you want to change the length of time the bridge waits between sending conﬁguration BPDUs:

1.Highlight the Hello Time ﬁeld, and type in a new value.

2.Click on .

The IEEE 802.1d speciﬁcation recommends that Hello Time = 2 seconds, with an allowable range of 1 to 10 seconds.

Changing Max Age Time

If the 9E312/9E423 Module is the Root Bridge or attempting to become the Root, and you want to change the maximum time that bridge protocol information will be kept before it is discarded:

1.Highlight the Max Age ﬁeld, and type in a new value.

2.Click on .

The IEEE 802.1d speciﬁcation recommends that Max Age = 20 seconds, with an allowable range of 6 to 40 seconds.

Changing Forwarding Delay Time

If the 9E312/9E423 Module is the Root Bridge or attempting to become the Root, and you want to change the time period the bridge will spend in the Listening state (e.g. either listening to BPDU activity on the network while moving from the Blocking to the Learning state or in the Learning state while the bridge is moving from the Listening to the Forwarding state):

1.Highlight the Forwarding Delay ﬁeld, and type in a new value.

2.Click on .

The IEEE 802.1d speciﬁcation recommends that Forward Delay = 15 seconds, with an allowable range of 4 to 30 seconds.

3-18	Bridge Spanning Tree

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Contents Page Virus Disclaimer Page Restricted Rights Notice Page Contents 9E312/9E423 Module Bridging IndexIntroduction Introduction Using the 9E312 and 9E423 User’s GuideRelated Manuals Common 9E312 and 9E423 Window Fields Software ConventionsUsing Buttons and Menus Getting Help from Cabletron Systems Technical Support Using On-line HelpGetting Help FTP 9E312 and 9E423 FirmwareIntroduction 9E312 and 9E423 Firmware 9E312/9E423 Module View 9E312/9E423 Module View Viewing Module InformationConnection Status Front Panel InformationMenu Structure Device Menu E312/9E423 Module View Menu StructureBridge Menu Utilities MenuHelp Menu Bridge Port Menu 9E312/9E423 Module Port Status DisplayChassis Manager Window Viewing the Device Type Setting the Device Date and TimeManaging the Module Edit Time Window Enabling and Disabling Bridge Ports Using the Find Source Address FeatureFind Source Address Window Summary InformationIndex Interface Description FieldsType DescriptionRaw Counts Interface Performance Statistics/Bar GraphsRate Interface Detail WindowLoad Unicast Interface Detail Window StatisticsMulticast ErrorDiscarded Unknown ProtocolPackets Received Testing and Disabling the Current InterfacePackets Transmitted Making Sense of Interface StatisticsUsing the Applications Pull-down menu 9E312/9E423 Module View Summary Information Bridging Basics 9E312/9E423 Module BridgingMore on Transparent Bridging An Overview of Remote Bridge ManagementBridge Status Window Bridge State on Interface Bridge Status Window Information FieldsInterface Speed Interface TypeInterface Address Bridge Statistics Enabling and Disabling BridgingPerformance Graphs Bridge Performance Graph Window Fields Errors RedFrames Forwarded Green Filtered MagentaConﬁguring the Bridge Performance Graphs Interface Statistics WindowAddress Interface Statistics Window FieldsNon-Unicast Bridge Spanning Tree9E312/9E423 Module Bridging Bridge Priority Conﬁguring the Bridge Spanning Tree WindowBridge Level Fields Root Cost Root BridgeRoot Port ProtocolBridge Port Level Fields Designated Cost Path 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 List Filtering Database Window FieldsNumber CapacitySource Port Conﬁguring the Filtering DatabaseReceive Port Port FilteringChanging the Receive Port Altering the Ageing TimeChanging the Type of Entry Adding or Deleting Individual Entries Changing the Port Filtering ActionClearing All Permanent, Static, or Dynamic Entries Using Port Source AddressingDevice Ageing Time Window Setting the Ageing TimeDuplex Modes Window Duplex ModesFull Duplex Duplex Modes Window FieldsInterface Setting the Duplex Mode Index Index-2