Mixed LAN Bridging | EXP Computer S200 specification

Bridging Features and Capabilities

Mixed LAN Bridging

What is It?PathBuilder S24x, 26x, and 27x switches support a mixture of Token Ring and Ethernet interfaces configured in the same node. This means the PathBuilder S24x, 26x, and 27x switch is able to perform remote Transparent bridging for Ethernet LANs from the same PathBuilder S24x, 26x, and 27x switch as shown in Figure 6. If you happen to configure two Ethernet LAN interfaces in the same node, instead of a mix of one Ethernet and one Token Ring, you can perform local Transparent bridging between the two Ethernet LANs.

Ethernet 1

Port 13

PB S200

Port 19

Ethernet 2

WAN

Ethernet 1

PB S200

Ethernet 2

Figure 6. Example of Mixed LAN Bridging in PathBuilder S24x, 26x, and 27x Switch

Note

Mixed LAN operation does not support translational bridging, meaning you cannot pass LAN traffic from an Ethernet LAN to a Token Ring LAN without using some sort of conversion software.

For More Details Refer to the “Mixed LAN Operation” section on page 114 for more details.

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Bridging

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EXP Computer S200 manual Mixed LAN Bridging

Contents

3Com Corporation Restricted Rights Notification for U.S. Government Users Restricted Rights Legend Proprietary Material Page Solutions OverviewFunctionality Multiple LANs Translational BridgingNo Local Bridging Transparent This Manual Topic This Notice Topic Bridging Features and Capabilities SwitchesIntroduction Bridging Primer Ethernet LAN Example Ethernet BridgeOperation WAN application, but you can also bridge across an X.25 WAN Mixed LAN Bridging MAC Addressing LLC2 Local Termination LLC2 LocalTermination LT Example Autolearn for Local Termination NetBIOS Name FilteringMac Address Filtering What Is It? Automatic Manual Spanning Tree Support Spanning Tree Protocol Dual Ethernet LANs Basic Remote Bridging Examples Across a WANWAN or Permanent Virtual Circuit PVC for Frame Relay Example of Bridges in an SVC Arrangement Bridge ConnectionsLAN Interface Support Bridging Setting Up WAN Operation for Bridging Interface Connections Between WAN and LAN Setting Up WAN Operation for Bridging Configure Bridge Parameters ParametersThese parameters make up the Bridge Parameter Record Maximum Number of Bridge Links Bad Hello Timeout Stpe ControlAUTO, MAN MAN Learn Only Period used for Ethernet only Aging Period used for Ethernet onlyBridge WAN Data Priority used for Ethernet only Bridged Protocols Parameters control the characteristics of this connection Bridge Link ParametersBridge links as links to the networks attached to it Bridge Link These parameters make up the Bridge Link Record Entry NumberBridgeType SR, TB, Bothsrandtb Hop Count Limit Largest Frame SizeMAC Address Filter Action NONE, PASS, Block Netbios Name Filter Action Protocol Filter ActionStpe Link State Link Mode NORMAL,RFC1294, TransNormal Virtual Ring Number LAN Connection Table Over the WANLAN Connection Table Parameters LAN Forwarder Type ROUT, BRID, BroutRout LAN Connection Type Encapsulation Type CodexAutocall Mnemonic Lcon Queue Limit Billing Records OFF, onOFF Traffic Priority Where bridging is done remotely across a WAN Limiting Bridge Frame SizesOverview Transmission times for large frames become significant Standard Frame SizesMaximum frame size Max Frame Size Line Speed Range kbps Configuring Translational Bridging Translational Bridging Example Bridge Frame Handling Configuring Source Route Bridging Operation ConfiguringNode for SRB Individual Bridge Bridging Connecting a Station to a Server in Source Route Bridging ProcedureLAN for a Source Route Bridging operation Located on remote LAN CCC Figure Server’s Destination MAC Address Not on LAN AAA LAN Bridge Link WAN Adapter Transmits Each are Frame Across the WAN Server Responds with Specifically Routed Test Frame Step Action Result/Description Then Transparent Bridging for Ethernet LANs LearningForwarder LAN link WAN link Link error Forwarder ExampleStatistics Filtering Hardware Accelerator LAN/WAN HandlersHardware Accelerator Functions Forwarder Functions Forwarder Initialization Learn Only Period Aging Forwarder Database and Spanning Tree Using Filters Multicast Link Frame is droppedList, the frame is dropped Control menu located in the Main menu Transparent Bridge Configuration Parameters TB ForwardingLocal MAC Address Bridge Link Number What is It? How Filtering is Used Bridge Filtering MAC Address Filtering Parameter Action Parameter Parameter Action Value MAC Filtering Process Mac Filtering Process Incoming and Outgoing Frames Example of a Frame Passing on a Bridge Link How To Configure Example Configuring the Bridge Link RecordMAC Address Filtering Examples First Example Configuring the MAC Address Filter Table Why it is Important Identifying Address Links for MAC AddressingAddress Links Series Switch Support MAC Wildcard FilteringFiltering works Configuring the MAC Address Filter Table Broadcast frames in the LAN networkCategories These parameters make up the MAC Address Filter Table Incoming Source Address Link ActionPASS, BLOCK, PASSLIST, Blocklist Pass Outgoing Source Address Link Action Incoming Destination Address Link Action Outgoing Destination Address Link Action List of Links Protocol Filtering Protocol Filter These parameters make up the Protocol Filter Table Record Protocol Type Protocol SAP hex valueProtocol OUI/IP hex value Protocol Value Incoming Protocol Link Action Outgoing Protocol Link Action Dsap Values Parameter Actions NetBIOS Name Filtering Broadcasts to and from the SVR* name patternTransparent Bridging Checking NetBIOS Forcing a LocalDomain With Filters Configuring NetBIOS Name Filtering How to ConfigureNetBIOS Name Filtering Step Action Select Configure Configure Step Action ResultEntry Number 1 appears Bridge Bridge Link Configure NetBIOS NetBIOS Name Filter TableBridge -NetBIOS Name Filter Name Filter Table Typical Filtering String TypeAscii Incoming NetBIOS Name Link Action Incoming NetBIOS Name List of Links Outgoing NetBIOS Name Link Action Outgoing NetBIOS Name List of LInks NetBIOS Name Filtering Statistics NetBIOS broadcasts filtered on the linkEach bridge link Check Detailed NetBIOS Packet Formats IBM NetBIOS Formats When to Use NetBIOS Name FilteringAll of the following are true Either one of the following is true Configuration Stpe Control= Auto Stpe Control = Manual Menu Spanning Tree Protocol Entity StpeSpanning Tree Tree Bridge Links Spanning Tree Protocol Entity Stpe Stpe Parameter Setting Considerations Example of aBridge Network Setting the Root Bridge Spanning Tree Bridge ID equals Bridge Priority Value in hex + MAC AddressDetermining Root Links Designated Links Type of Network Speed Stpe Path Cost Consider NatureExpected Number SVCs Two Bridge Links Between B3 and B4 Spanning Tree Protocol Entity Stpe Spanning Tree Timers Timer ParametersHello Timer Max Age Other Considerations Bridge Forward Delay Timer Message Events in Network Spanning Tree Protocol Entity Stpe Aging Timer Bridges can adjust to the changeLocation and forwards packets to it properly Preventing session timeouts in a Bridging application LLC2 Local Termination Well as network delays Terminal session, causingBefore Local After Local Supported TopologiesImproper LT Proper LT configuration LLC Protocol LLC Frame Description LLC2 Frame DescriptionType Name Description Local Termination spoofs Local Termination does not spoof Bridging 105 Configuring Local Termination Local Termination Boot Type LLC LT Station StepStation Table Entry Number WAN Parameters T1Reply Timer T2 Rx Ack TimerLocal SAP LLC Profile Name Boot Type LLC LT WAN Parameters Ti Inactivity TimerN3 ACK Delay Count N2 Retry Count Configuration Entry Number Tx Window SizeLCC LT WAN Data Priority HIGH, MEDIUM, LOW T1 Reply Timer 112 Bridging Deleting LT Configuration Records 27x switch, as shown in Figure Mixed LAN OperationMixed LAN Environment Limitations Select Configure Bridge Bridge Link Parameters menuBridge Link Parameters from CTP Main menu, to activate Bridge link Bothsrandtb System powerup Dual LAN Ethernet Routing SupportedDual Ethernet LAN Cmem For Details on Parameters LAN Server Subsystem Alarms Configuring the LSS Record Example of LCCRecord Virtual Port’s MAC Address ENABLE, Disable DisableVirtual Bridge ID Path Trace Control Bridge Statistics Statistics Menu screen Spanning Tree Statistics Stpe StatusStatus report Term Description Disabled The Stpe is disabled. If Stpe Control StateAre Parameter is MAN Detailed Bridge Link Statistics Detailed Bridge Link Statistics First Screen Terms RIF Bridge Link Filter Summary Link FilterSummary Description Bridging 131 Transparent Bridge Forwarding Table Statistics Stats ExampleStats Descriptions Shown in Figure Bridging 133 Transparent Bridge Detailed Bridge Link Statistics Terms-Transparent Bridge Second FF-FF-FF-FF-FF-FF Frame Totals This is a count of the number of framesReceived/transmitted of all types on this link LAN Connection Statistics Statistics MenuDetailed LAN Connection Statistics Detailed LAN Connection Statistics Second Explains why the last call was cleared Last clear diagnostic code This is the diagnostic codeConnection and explains why the call was cleared SVCs. The possible states are Blank for PVCs blank Bridging 139 Example of LAN shows the LAN Connection Summary Statistics Connection Summary Statistics LLC2 LT Session Summary Statistics Heading DescriptionSAP Remote MAC Addr Heading LLC2 LT Detailed Session Statistics Session Statistics Last Statistics Last time statistics were reset Reset Routing information field used in all frames transmittedField, ring number, and bridge number information Heading Description Local Station Session Summary Heading Description Remote Spoofer Session Summary Reset Statistics 148 Bridging Technical Support Access by Analog Modem 3ComFacts Automated Fax ServiceAccess by Digital Modem Country Data Rate Telephone Number Support from 3ComCountry Telephone Number Country Telephone Number Fax Number Index Numerics LAN OUI URL A-1 Index-5