Cabletron Systems CSX200, CSX400 manual Bridging Basics

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Chapter 4

Bridging

A brief explanation of bridging methods; viewing and managing bridging interfaces; using the Bridge Status window; enabling and disabling bridging; viewing bridge statistics; using Spanning Tree; using the Filtering Database; using the Source Route Configuration window; using the Find Source Address feature; using the Port Source Addresses window; configuring duplex modes; using SONET port configuration options; configuring broadcast suppression; using the Token Ring Bridge Mode window; using the Physical View windows; using the Interface Configuration window; using the Bridge Configuration and Port Configuration windows; and configuring SmartTrunking

Bridging Basics

Bridges are used in local area networks to connect two or more network segments and to control the ßow of packets between the segments. Ideally, bridges forward packets to another network segment only when necessary.

Bridges are also used to increase the fault tolerance in a local area network by creating redundant bridge paths between network segments. In the event of a bridge or bridge segment failure, an alternate bridge path will be available to network trafÞc, without signiÞcant interruption to its ßow.

The method a bridge uses to forward packets, choose a bridge path, and ensure that a sending stationÕs messages take only one bridge path depends on the bridgeÕs type: Transparent (generally used in Ethernet or FDDI environments) or Source Routing (generally used in Token Ring environments), source routing-transparent, or source route-transparentÑthe two latter being combinations that are found in a mixed network environment.

NOTE

Not all of the sections in this chapter Ñ Source Routing and Token Ring information, for example Ñ are applicable to your CSX200/400 device.

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Contents CSX200 and CSX400 User’s Guide Page Virus Disclaimer Page Restricted Rights Notice Page Contents Chapter Bridging Vii Token Ring Physical Status Fields IndexIntroduction HSIM-W6 and HSIM-W84 Using the CSX 200 and CSX400 User’s GuideRelated Manuals Device Name Software ConventionsCommon Window Fields MAC Address Using the MouseIP Address LocationUsing Window Buttons Getting Help from the Cabletron Systems Global Call Center Using On-line HelpGetting Help CSX200 and CSX400 Firmware CSX200 and 400 Chassis View CSX200 and CSX400 Chassis View Windows Viewing Chassis InformationFront Panel Information Date Menu StructureTime Port Status Menu Device MenuPort Menus Utilities MenuHelp Menu Status CSX200/400 Port Status DisplaysSelecting a Port Status View Load Port Status Color Codes Chassis Manager WindowDevice Type Viewing Hardware TypesViewing the Port Description Managing the DeviceViewing I/F Summary Information Using the Find Source Address FeatureDescription IndexRaw Counts Physical StatusLogical Status Interface Performance Statistics/Bar GraphsRate Detail Interface Statistics Viewing Interface DetailNon-Unicast ErrorAddress UnicastMaking Sense of Detail Statistics Enabling and Disabling PortsPackets Transmitted Transmit only CSX200 and 400 Chassis View CSX200 and 400 Chassis View Managing the Device About the CSX200 Series CSX200 and CSX400 WAN ConfigurationWAN Redundancy About the CSX400WPIM-DDS CSX WPIMsEIA-RS449 WAN Logical View Window WAN Logical ViewWAN Logical View Window Fields Changing WAN Logical SettingsCSX200 and CSX400 WAN Configuration CSX200 and CSX400 WAN Configuration WAN Logical View Bridging Basics BridgingAbout Source Route Bridging About Transparent BridgingBridging About Source Route-Translational Bridges About Source Route-Transparent BridgesBridging Viewing and Managing Bridging Interfaces Bridging Bridge Status Window Information Fields Bridge Status WindowBridge State on Interface Up TimeBridge Address Accessing Other Options from the Bridge Status WindowInterface Type Bridging Bridging Bridging From the Bridge Status window Enabling and Disabling BridgingEnabling and Disabling Individual Interfaces From the Chassis View window Enabling and Disabling All Installed InterfacesBridge Statistics Performance GraphsFrom the Bridge Status window Filtered Magenta Bridge Performance Graph Window FieldsFrames Forwarded Green Bridge Detail Breakdown Window Errors RedXmitted Blue Configuring the Bridge Performance GraphsFiltered Frames ForwardedForwarded from XmittedBridge Port Detail Breakdown Window Forwarded toI/F Statistics Window Interface Statistics WindowStatistics Window Fields Transmit Queue Size Csmacd Statistics WindowUnknown Protocol Packets ReceivedAlignment Receive ErrorsTransmission Errors PPP Link Statistics Window Collision ErrorsPackets Too Long ErrorsBad Addresses Bad ControlsStatistics Dot5 Errors Statistics Window Burst Errors Line ErrorsSoft Errors Internal ErrorsCongestion Errors Token ErrorsSource Route Statistics All Paths Expl Bridge Source Routing Window FieldsReceived Frames Specif. RoutedDiscards Transmitted FramesHop Cnt. Exceeded Bridge Spanning TreeBridge Priority Configuring the Bridge Spanning Tree WindowBridge Level Fields Root Port Root BridgeRoot Cost Bridge Port Level Fields Designated Bridge Path CostDesignated Cost Designated RootChanging 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 Bridging From the Bridge Status window Capacity Filtering Database Window FieldsList NumberReceive Port Configuring the Filtering DatabaseAging Time Source PortChanging the Type of Entry Altering the Aging TimeAdding or Deleting Individual Entries Changing the Receive PortChanging the Port Filtering Action Clearing All Permanent, Static, or Dynamic Entries Ethernet and Token Ring Special Filter DatabasesEthernet Special Filter Database Window 13. Ethernet Special Filter Database Window Token Ring Special Filter Database WindowDestination Address EnableSpecial Filter Database Window Fields FileDefining and Editing Filters in the Special Database This 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 Source Route Configuration 16. Source Route ConÞguration Window Information on Source RoutingSource Route Configuration Fields Source Route Configuration WindowHop Count Limit Subnet MaskLocal Segment Target SegmentBridge Number Spanning Tree ExplSpanning Tree Mode Making and Setting Changes Using the Find Source Address FeaturePort Source Addresses Window Setting the Aging Time Duplex Modes Interface Duplex Modes WindowDuplex Modes Window Fields Full Duplex Setting the Duplex ModeEthernet Port Configuration Window Standard ModeFast Ethernet Port Configuration Link State Current Operational ModePort Type Remote Capabilities Desired Operational ModeAdvertised Abilities Setting the Desired Operational Mode for the FE-100FX Setting the Desired Operational Mode for the FE-100TXSONET/SDH Configuration Sonet Port ConfigurationSonet SONET/SDH Statistics Window Bridging 24. The SONET/SDH Statistics Window Loss of Pointer Loss of SignalLoss of Frame Errored SecondsCode Violations Severely Errored SecondsSeverely Errored Framing Seconds Configuring Broadcast Suppression Token Ring Bridge Mode Source Routing Setting The Token Ring Bridge ModeDefining the Bridge Modes TransparentActive Port Using the Physical View WindowsEtwmim Ethernet Port Physical View Ethernet Port Physical Status FieldsEpim Type Etwmim Token Ring Port Physical ViewRing State Token Ring Physical Status FieldsRing Speed Active Monitor FNB StateUsing the Interface Configuration Window 29. Interface ConÞguration Window Defining the Bridge MethodOther Setting the Bridge MethodNetBIOS Defining the Protocol TransmissionUsing the Bridge and Port Configuration Windows From the Bridge Status window Ring Number Virtual Ring NumberBridge Mode/Explorer Type Port ModeNovell Translation Configuring SmartTrunking Name Port# SmartTrunks ModeSmartTrunk State InstanceBridging Bridging 100 Configuring SmartTrunking Index Index-2 Index-3 Index-4
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CSX200, CSX400 specifications

Cabletron Systems was a leading developer of networking solutions, and its CSX400 and CSX200 series of high-performance switches represent some of the key innovations in the field of enterprise networking during their time. Both models were geared towards enhancing network reliability, efficiency, and speed, particularly in environments where heavy data traffic and complex networking demands were prevalent.

The CSX400, designed for larger enterprises, boasts a robust architecture capable of handling significant throughput. One of its standout features is its stackable design, allowing multiple switches to be interconnected and managed seamlessly as a single unit. This scalability provides organizations with the flexibility to expand their networks without significant infrastructure overhauls. The CSX400 supports various Ethernet standards, including 10/100 Ethernet and Gigabit Ethernet, positioning it to effectively manage both legacy and modern networking requirements.

In addition to its scalability, the CSX400 is distinguished by its advanced Layer 2 and Layer 3 routing capabilities. This dual-layer functionality enables efficient data handling and is instrumental in managing traffic between different network segments. Moreover, the switch incorporates features like VLAN (Virtual Local Area Network) support and Quality of Service (QoS) prioritization, allowing for enhanced performance of critical applications and streamlined bandwidth allocation.

On the other hand, the CSX200 series is tailored for smaller enterprises or branch offices needing a reliable yet efficient networking solution. Despite its compact design, the CSX200 is equipped with essential features that promote effective network management and security. It offers a simplified management interface, making it user-friendly for network administrators. The switch also provides essential access control measures, employing technologies like IEEE 802.1X for network access security.

Both the CSX400 and CSX200 prioritize performance through the incorporation of advanced switching technologies. They support features such as Spanning Tree Protocol (STP), enabling loop-free topologies and enhanced network resilience. These attributes are particularly crucial in dynamic networking environments where downtime can have significant repercussions on business operations.

Overall, Cabletron Systems' CSX400 and CSX200 series represent a blend of scalability, advanced routing capabilities, and user-friendly management, making them vital assets for organizations looking to optimize their network infrastructure during a period of rapid technological evolution. With their rich feature sets and unwavering performance, these switches helped pave the way for modern networking solutions that cater to diverse enterprise needs.
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