Cabletron Systems 9E312 Path Cost, Designated Cost, Designated Root, Designated Bridge, Topology

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9E312/9E423 Module Bridging

A lower assigned value gives the port a higher Priority when BPDUs are compared. The allowable range is 0-FF hexadecimal (0-255 decimal); the default is 80 hexadecimal.

Path Cost

Displays the cost that this port will contribute to the calculation of the overall Root path cost in a Conﬁguration BPDU transmitted by this bridge port. You can lower a port’s Path Cost to make the port more competitive in the selection of the Designated Port — for example, you may want to assign a lower path cost to a port on a higher performance bridge. The allowable range is 1 to 65535.

Designated Cost

Displays the cost of the path to the Root Bridge of the Designated Port on the LAN to which this port is attached. This cost is added to the Path Cost to test the value of the Root Path Cost parameter received in Conﬁguration BPDUs.

Designated Root

Displays the unique bridge identiﬁer of the bridge that is assumed to be the Root Bridge.

Designated Bridge

Displays the network address portion of the Bridge ID (MAC address/priority component) for the bridge that is believed to be the Designated Bridge for the LAN associated with this port.

The Designated Bridge ID, along with the Designated Port and Port Identiﬁer parameters for the port, is used to determine whether this port should be the Designated Port for the LAN to which it is attached. The Designated Bridge ID is also used to test the value of the Bridge Identiﬁer parameter in received BPDUs.

Designated Port

Displays the network address portion of the Port ID (which includes a manageable priority component) of the port believed to be the Designated Port for the LAN associated with this port.

The Designated Port ID, along with the Designated Bridge and Port Identiﬁer parameters for the port, is used to determine whether this port should be the Designated Port for the LAN to which it is attached. Management also uses it to determine the Bridged LAN topology.

Topology

This indicates how many times the bridge’s Topology Change ﬂag has been changed since the 9E312/9E423 Module was last powered-up or initialized. It also indicates the date and time at which the topology was last changed. The Topology Change ﬂag increments each time a bridge enters or leaves the network, or when the Root Bridge ID changes.

3-16	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 Using On-line Help Getting HelpGetting Help from Cabletron Systems Technical Support 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 StructureUtilities Menu Help MenuBridge Menu Bridge Port Menu 9E312/9E423 Module Port Status DisplayChassis Manager Window Setting the Device Date and Time Managing the ModuleViewing the Device Type Edit Time Window Enabling and Disabling Bridge Ports Using the Find Source Address FeatureFind Source Address Window Summary InformationDescription Interface Description FieldsIndex TypeRaw Counts Interface Performance Statistics/Bar GraphsInterface Detail Window LoadRate Unicast Interface Detail Window StatisticsUnknown Protocol ErrorMulticast DiscardedMaking Sense of Interface Statistics Testing and Disabling the Current InterfacePackets Received Packets TransmittedUsing 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 Type Interface AddressInterface Speed Bridge Statistics Enabling and Disabling BridgingPerformance Graphs Filtered Magenta Errors RedBridge Performance Graph Window Fields Frames Forwarded GreenConﬁguring the Bridge Performance Graphs Interface Statistics WindowAddress Interface Statistics Window FieldsNon-Unicast Bridge Spanning Tree9E312/9E423 Module Bridging Conﬁguring the Bridge Spanning Tree Window Bridge Level FieldsBridge Priority Protocol Root BridgeRoot Cost Root PortBridge Port Level Fields Designated Bridge Path CostDesignated Cost Designated RootChanging Bridge Spanning Tree Parameters Changing Bridge PriorityChanging the Spanning Tree Algorithm Protocol Type Changing Forwarding Delay Time Changing Hello TimeChanging Max Age Time Filtering Database Changing Port PriorityChanging Path Cost 9E312/9E423 Module Bridging Filtering Database Window Capacity Filtering Database Window FieldsList NumberPort Filtering Conﬁguring the Filtering DatabaseSource Port Receive PortAltering the Ageing Time Changing the Type of EntryChanging the Receive Port 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 ModesDuplex Modes Window Fields InterfaceFull Duplex Setting the Duplex Mode Index Index-2