Cabletron Systems 9A128-01 manual Changing Bridge Priority, Changing Hello Time

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Bridging

NOTE

Any values you set at the bridge will cause a Topology Change ﬂag to be issued in the next Conﬁguration BPDUs it transmits. This will cause the bridged network to immediately recalculate Spanning Tree and change topology accordingly.

Changing Bridge Priority

To change the part of the bridge address that contains the identiﬁer used in the Spanning Tree Algorithm for priority comparisons:

1.Highlight the Bridge Priority field.

2.Enter the new identiﬁer, in hexadecimal format; the allowed range is 0-FFFF hexadecimal.

3.Click on Set.

The selected Bridge Priority will be applied to the bridge (a lower number indicates a higher priority in the root selection process).

Changing the Spanning Tree Algorithm Protocol Type

!

CAUTION

To change the type of protocol used in Spanning Tree:

1.Click the mouse on the appropriate option button: IEEE 802.1, DEC, or None.

2.Click on Set.

The selected Spanning Tree Algorithm protocol type will be applied to the bridge. If you selected None, the Spanning Tree Algorithm will be disabled (if it already was enabled). If STA Protocol Type was changed from None to IEEE 802.1 or DEC, you must restart the bridge for the newly selected STA protocol to be applied.

All bridges in a network must use the same Spanning Tree version. Mixing Spanning Tree Algorithm protocols will cause an unstable network.

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 Set.

The IEEE 802.1d speciﬁcation recommends that Hello Time = 2 seconds; the allowable range is 1 to 10 seconds.

Bridge Spanning Tree

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Contents Cabletron Systems Virus Disclaimer Page Restricted Rights Notice Page Contents Chapter Fddi Management Chapter BridgingIndex Using This Guide IntroductionRelated Reading Software Conventions Common Window FieldsDevice Name IP AddressUsing Buttons Using On-line HelpGetting Help LocationGetting Help from the Cabletron Systems Global Call Center FTPFirmware Versions Supported 9A128-01 Module View Viewing Module Information Front Panel InformationBoot Prom Connection StatusUpTime Port StatusMenu Structure TimeDate A128-01 Module View Menu Structure Device MenuPort Status Menu Fddi Menu Utilities MenuHelp Menu Board MenusPort Status Displays Port MenusSelecting a Port Status View Bridge Port Status DisplaysBridge Port State Bridge MappingBridge Port Status Color Codes Fddi Port Status DisplaysConnection State LER EstimateChassis Manager Window Fddi Port Status Color CodesViewing Hardware Types Device TypeModule Type Viewing I/F Summary Information Module Type WindowIndex DescriptionSta Interface Performance Statistics/Bar GraphsRaw Counts LoadRate Interface Statistics WindowError AddressUnicast Non-UnicastUsing the Find Source Address Feature Packets Received Received onlyTransmit Queue Size Transmit only Packets Transmitted Transmit onlySetting the Device Date and Time Managing the HubEnabling and Disabling Ports Bridge PortsModule Ports Accessing the ATM Connections Window ATM ConﬁgurationATM Conﬁguration Connection DataSettings VPIConﬁguring Connections Adding a New ConnectionDeleting a Connection ATM Conﬁguration Conﬁguring Connections Fddi Management Conﬁguration Fddi ManagementMAC State SMT Version Req. Requested Target Token Rotation TimeNeg. Negotiated Concentrator M Ports Concentrator Non-M PortsNumber of MACs MAC PathConnection Policy 15 32,768 a permanently set value for this bit Address Mode Station ListNumber of Nodes Stations Panel Node ClassTopology Upstream NeighborPerformance Frame Errors Transmit FramesReceive Frames Lost FramesFddi Management Performance Bridging Bridge Status Window BridgingUp Time Bridge State on InterfaceInterface Type Bridge AddressConﬁguring Duplex Modes Enabling and Disabling Bridging Bridge Statistics Performance GraphsForwarded Green Total Errors Red Filtered MagentaXmitted Blue Conﬁguring the Bridge Performance GraphsErrors ForwardedFiltered XmittedInterface Statistics Window Forwarded toForwarded from Description Using Source Addressing Setting the Ageing Time Port Source Addresses WindowBridge Spanning Tree Conﬁguring the Bridge Spanning Tree Window Bridge PriorityRoot Bridge Root CostRoot Port ProtocolForwarding Delay Hello TimeMax 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 Filtering Database Changing Path CostBridging Bridging List NumberCapacity Ageing TimeConﬁguring the Filtering Database Receive PortPort Filtering Altering the Ageing Time Changing the Type of EntryChanging 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