Changing Bridge Priority | Cabletron Systems 9A128-01 specification

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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Cabletron Systems 9A128-01 manual Changing Bridge Priority, Changing the Spanning Tree Algorithm Protocol Type

Contents

Cabletron Systems Virus Disclaimer Page Restricted Rights Notice Page Contents Chapter Fddi Management Chapter BridgingIndex Using This Guide Introduction Related Reading Software Conventions Common Window FieldsDevice Name IP Address Using Buttons Using On-line HelpGetting Help Location Getting Help from the Cabletron Systems Global Call Center FTP Firmware Versions Supported 9A128-01 Module View Viewing Module Information Front Panel Information Boot Prom Connection StatusUpTime Port Status Menu Structure TimeDate A128-01 Module View Menu Structure Device Menu Port Status Menu Fddi Menu Utilities MenuHelp Menu Board Menus Port Status Displays Port Menus Selecting a Port Status View Bridge Port Status Displays Bridge Port State Bridge MappingBridge Port Status Color Codes Fddi Port Status Displays Connection State LER Estimate Chassis Manager Window Fddi Port Status Color Codes Viewing Hardware Types Device TypeModule Type Viewing I/F Summary Information Module Type Window Index DescriptionSta Interface Performance Statistics/Bar Graphs Raw Counts Load Rate Interface Statistics Window Error AddressUnicast Non-Unicast Using the Find Source Address Feature Packets Received Received onlyTransmit Queue Size Transmit only Packets Transmitted Transmit only Setting the Device Date and Time Managing the Hub Enabling and Disabling Ports Bridge Ports Module Ports Accessing the ATM Connections Window ATM Conﬁguration ATM Conﬁguration Connection Data Settings VPI Conﬁguring Connections Adding a New Connection Deleting a Connection ATM Conﬁguration Conﬁguring Connections Fddi Management Conﬁguration Fddi Management MAC State SMT Version Req. Requested Target Token Rotation TimeNeg. Negotiated Concentrator M Ports Concentrator Non-M PortsNumber of MACs MAC Path Connection Policy 15 32,768 a permanently set value for this bit Address Mode Station ListNumber of Nodes Stations Panel Node ClassTopology Upstream Neighbor Performance Frame Errors Transmit FramesReceive Frames Lost Frames Fddi Management Performance Bridging Bridge Status Window Bridging Up Time Bridge State on InterfaceInterface Type Bridge Address Conﬁguring Duplex Modes Enabling and Disabling Bridging Bridge Statistics Performance Graphs Forwarded Green Total Errors Red Filtered MagentaXmitted Blue Conﬁguring the Bridge Performance Graphs Errors ForwardedFiltered Xmitted Interface Statistics Window Forwarded toForwarded from Description Using Source Addressing Setting the Ageing Time Port Source Addresses Window Bridge Spanning Tree Conﬁguring the Bridge Spanning Tree Window Bridge Priority Root Bridge Root CostRoot Port Protocol Forwarding Delay Hello TimeMax Age Hold Time Changing 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 Cost Bridging Bridging List NumberCapacity Ageing Time Conﬁguring the Filtering Database Receive PortPort Filtering Altering the Ageing Time Changing the Type of EntryChanging the Receive Port Changing the Port Filtering Action Clearing All Permanent, Static, or Dynamic Entries Bridging Filtering Database Index Index-2 Index-3 Index Index-4