Filtering Database, Changing Port Priority | Cabletron Systems 2.2

Bridging

Changing Port Priority

To change the part of the Port Priority used in priority comparisons:

1.If necessary, select the desired port by clicking the mouse to highlight the port in the lower right quadrant of the window. The lower left quadrant of the window will now allow you to edit parameters for the selected port.

2.Highlight the port Priority ﬁeld, and enter the new priority identiﬁer. Only valid hexadecimal numbers (0 to FF) are allowed in this ﬁeld. The default is 80 hexadecimal.

3.Click on Set. The new port priority will be saved.

Changing Path Cost

To change the Path Cost:

1.If necessary, select the desired port by clicking the mouse to highlight the port in the lower right quadrant of the window. The lower left quadrant of the window will now allow you to edit parameters for the selected port.

2.Highlight the Path Cost ﬁeld, and type in a new value from 1 to 65535 decimal (default is 100 decimal).

3.Click on Set.

The new path cost will be applied to the port.

Filtering Database

The Filtering Database, which makes up the IEEE 802.1 Source Address Table, is used to determine which frames will be forwarded or Þltered across the deviceÕs bridging ports.

During initialization, the bridge copies the contents of its Permanent Database to the Filtering Database. Next, the bridge learns network addresses by entering the source address and port association of each received packet into the Filtering Database. When in the Forwarding state, the bridge examines each received packet, checks it against the Special Database (refer to Special Filter Databases, page 2-47), and then (if no special Þltering applies) compares the destination address to the contents of the Filtering Database.

If the destination address is located on the network from which the packet was received, the bridge Þlters (does not forward) the packet. If the destination address is located on a different network, the bridge forwards the packet to the appropriate network. If the destination address is not found in the Filtering Database, the bridge forwards the packet to all networks. To keep Filtering Database entries current, older entries are purged after a period of time, which is called the Dynamic Aging Time.

Filtering Database

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Cabletron Systems 2.2 manual Filtering Database, Changing Port Priority, Changing Path Cost

Contents

Bridge/Router Interface Brim User’s Guide Page Virus Disclaimer Restricted Rights Notice Contents Contents Index Chapter Fddi ApplicationsChapter WAN Applications Chapter ATM Conﬁguration Contents Introduction BRIM-E100 Using the Brim User’s Guide Brim Management Applications Related Manuals Software Conventions Using the Mouse Left Mouse Button Right Mouse Button Location Common Device Window FieldsDevice Name IP Address Using Window Buttons Getting Help Using On-line HelpAccessing On-line Documentation Hours a day, 365 days a year Getting Help from the Cabletron Systems Global Call Center Introduction Getting Help About Transparent Bridging Bridging Basics Bridging About Source Route Bridging About Source Route-Transparent Bridges About Source Route-Translational Bridges Viewing and Managing Bridging Interfaces Bridging Bridge Status Window Up Time Bridge Status Window Bridge Address Accessing Bridge Status Window OptionsBridge State on Interface Interface Type Bridging Bridging Bridging Bridging Enabling and Disabling Individual Interfaces Enabling and Disabling All Installed InterfacesEnabling and Disabling Bridging Performance Graphs Bridge Statistics Bridging Xmitted Blue Errors RedFrames Forwarded Green Filtered Magenta Bridge Detail Breakdown Xmitted ErrorsFrames Forwarded Filtered Forwarded from Interface StatisticsForwarded to Type DescriptionAddress Discarded ErrorUnicast Non-Unicast Csmacd Statistics Receive Errors Transmission Errors PPP Link Statistics Collision Errors Errors Statistics Dot5 Errors Burst Errors Line Errors Soft Errors Internal ErrorsCongestion Errors Token Errors Source Route Statistics Received Frames Discards Transmitted Frames Spanning Tree Bridge Priority Bridge Level Protocol Root BridgeRoot Cost Root Port Bridge Port Level Designated Bridge Path CostDesignated Cost Designated Root Changing the Spanning Tree Algorithm Protocol Type Conﬁguring Spanning TreeChanging Bridge Priority Changing Max Age Time Changing Forwarding Delay TimeChanging Hello Time Changing Path Cost Filtering DatabaseChanging Port Priority Bridging 11. The Filtering Database Window Aging Time ListNumber Capacity Altering the Aging Time Conﬁguring the Filtering DatabasePort Filtering Adding or Deleting Individual Entries Changing the Type of EntryChanging the Receive Port Changing the Port Filtering Action Clearing All Permanent, Static, or Dynamic Entries Special Filter Databases Ethernet and Token Ring Special Filter Database Windows File EnableSpecial Filter Database Window Data Offset Destination AddressSource Address Data Type Deﬁning and Editing Filters in the Special Database Changing the Port Filtering Action Setting the Port Filtering ActionChanging the Receive Ports Clearing the Port Filtering Action Enabling and Disabling a FilterSaving a Set of Filters to a File Interface Conﬁguration Source Routing Bridge MethodsTransparent Source Route Transparent Setting the Bridge MethodNetBIOS Protocol Transmission Methods 16. Source Route ConÞguration Window Source Route Conﬁguration Source Route Conﬁguration Source Routing Information Subnet Mask Spanning Tree Expl Local SegmentTarget Segment Hop Count Limit Bridge Number Spanning Tree Mode Making and Setting Changes Using the Find Source Address Feature Using the Port Source Addresses Window Setting the Aging Time Using the Token Ring Bridge and Port Conﬁguration Windows Bridging Ring Number Virtual Ring Number Bridge Mode/Explorer Type Port ModeNovell Translation Ring Speed Source Route/STE Duplex Modes Full Duplex Duplex Modes WindowInterface Ethernet Port Conﬁguration Setting the Duplex Mode Fast Ethernet Port Conﬁguration Standard Mode Bridging Link State Current Operational ModeDesired Operational Mode Port Type Setting the Operational Mode for the FE-100TX SONET/SDH Conﬁguration Setting the Operational Mode for the FE-100FXSonet Port Conﬁguration Sonet SONET/SDH Statistics Bridging 26. The SONET/SDH Statistics Window Errors Statistics Bridging 27. The SmartTrunk ConÞguration and Status Window Conﬁguring SmartTrunking SmartTrunk State PortName Mode Bridging Conﬁguring Broadcast Suppression Token Ring Bridge Mode Setting Token Ring Bridge Mode Setting Bridge Translation 32. Bridge Translation Window Enabling and Disabling Auto and Dual Translate Modes Conﬁguring Novell Token Ring Packet Translation Conﬁguring Token Ring Packet Translation IBM Translation Table State Index Conﬁguring Snap Translation Snap Translation Table Using the Novell Translation Window Bridging Ethernet Port Physical View Using the Physical View Windows for the Etwmim Epim Type Active Port 41. Token Ring Port Physical View Token Ring Port Physical View FNB State Ring State Active Monitor Bridging 104 Using the Physical View Windows for the Etwmim Fddi Applications Conﬁguration Window Accessing the Fddi Menu MAC State Concentrator M Ports SMT VersionReq. Requested Target Token Rotation Time Neg. Negotiated MAC Path Connection Policy WindowConcentrator Non-M Ports Number of MACs Connection Policy Window 15 32,768 Ð a permanently set value for this bit Number of Nodes Address ModeStation List Window Upstream Neighbor Node Class Receive Frames Fddi Performance WindowTransmit Frames Ring Ops Setting the Time IntervalFrame Errors Fddi Applications Fddi Performance Window WAN Applications Accessing the WAN Status Windows Current Primary Viewing WAN Interface StatusCurrent Active Desired Primary Conﬁguring the Synchronous Connection State Change InspeedOutspeed Clock Source Line Coding Conﬁguring T-1 PortsWAN Port Name Line Type Xmt Clock Source Loopback ModeSignal Mode Circuit ID Interface LineCoding Using the T1 FracTable Conﬁguration Window Conﬁguring the Fractional Table ChannelsMax Bandwidth Changing the Interface Line Coding Restoring a Fractional Table Compression Displaying the WAN Logical View CRC Length Changing WAN Logical Settings Operational Status Viewing the WAN Port Admin/StatusSynchronous Admin/Status WAN Interfaces T1 Admin/StatusAdmin Status Oper and Admin Frame Check Displaying Synchronous Port StatisticsEnabling and Disabling WAN T1 Interfaces Interrupted Frames Total ErrorsXmit UnderRuns Receive OverRuns WAN Applications Displaying Synchronous Port Statistics ATM Conﬁguration Accessing the ATM Connections Window Connection Data Settings VPI Conﬁguring Connections Adding a New Connection Deleting a Connection ATM Conﬁguration Conﬁguring Connections Index Index-2 Index-3 Index-4 Index-5 Index Index-6