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EXP Computer S200 manual Proper LT configuration, Type Name Description

Models: S200

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Proper LT configuration

LLC2 Local Termination

Figure 52 shows a Token Ring LAN properly configured for Local Termination.

SNA FEP

1

LLC2

Keepalives/Acks

LLC2

Keepalives/Acks

2

3

CC

LLC Protocol

LLC Frame Description

LLC2 Frame Description

LLC2
							CC

Keepalives/Acks

Figure 52. Example of Proper LT Configuration

Local Termination running on PathBuilder S200 series switch bridges 1, 2, and 3 at the edge points of the network provide a simple solution to congestion and bandwidth problems across the entire network.

LLC is a link layer protocol used in IBM environments and defined in the IEEE802.2 LAN model. Its function is to establish, maintain, and terminate the logical link between adjacent stations in a network.

There are three types of LLC operations:

Type	Name	Description

Type 1	LLC1	Unacknowledged, connectionless services

Type 2	LLC2	Connection-oriented services

Type 3	LLC3	Acknowledged, connectionless services

Logical Link Control 2 (LLC2) is a connection-oriented, acknowledged protocol. LLC2 requires a connection setup between two LAN devices. LLC2 is based on the HDLC protocol and is used to transport SNA traffic, as well as other protocols.

Bridging

103

T0008-16F

Release 5.2M

Image 107

EXP Computer S200 manual Proper LT configuration, LLC Protocol LLC Frame Description LLC2 Frame Description

Contents

3Com Corporation Restricted Rights Legend Restricted Rights Notification for U.S. Government UsersProprietary Material Page Multiple LANs SolutionsOverview FunctionalityTransparent TranslationalBridging No Local BridgingThis Manual Topic This Notice Topic Bridging Primer Bridging Features and CapabilitiesSwitches IntroductionEthernet LAN WAN application, but you can also bridge across an X.25 WAN ExampleEthernet Bridge OperationMixed LAN Bridging MAC Addressing LT Example LLC2 Local TerminationLLC2 Local TerminationAutolearn for Local Termination Filtering NetBIOS NameFiltering Mac AddressSpanning Tree Protocol What Is It? Automatic Manual Spanning Tree SupportDual Ethernet LANs WAN or Permanent Virtual Circuit PVC for Frame Relay Basic Remote Bridging ExamplesAcross a WAN Example of Bridges in an SVC Arrangement Support BridgeConnections LAN InterfaceBridging Interface Connections Between WAN and LAN Setting Up WAN Operation for BridgingSetting Up WAN Operation for Bridging Configure Maximum Number of Bridge Links Bridge ParametersParameters These parameters make up the Bridge Parameter RecordMAN Bad Hello TimeoutStpe Control AUTO, MANBridge WAN Data Priority used for Ethernet only Learn Only Period used for Ethernet onlyAging Period used for Ethernet only Bridged Protocols Bridge Link Parameters control the characteristics of this connectionBridge Link Parameters Bridge links as links to the networks attached to itSR, TB, Bothsrandtb These parameters make up the Bridge Link RecordEntry Number BridgeTypeNONE, PASS, Block Hop Count LimitLargest Frame Size MAC Address Filter ActionStpe Link State Netbios Name Filter ActionProtocol Filter Action Virtual Ring Number Link ModeNORMAL,RFC1294, Trans NormalTable Parameters LAN Connection TableOver the WAN LAN ConnectionLAN Connection Type LAN Forwarder TypeROUT, BRID, Brout RoutLcon Queue Limit Encapsulation TypeCodex Autocall MnemonicTraffic Priority Billing RecordsOFF, on OFFTransmission times for large frames become significant Where bridging is done remotely across a WANLimiting Bridge Frame Sizes OverviewMax Frame Size Line Speed Range kbps Standard FrameSizes Maximum frame sizeConfiguring Translational Bridging Translational Bridging Example Bridge Frame Handling Individual Bridge Configuring Source Route Bridging OperationConfiguring Node for SRBBridging Located on remote LAN CCC Figure Connecting a Station to a Server in Source Route BridgingProcedure LAN for a Source Route Bridging operationServer’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 Then Step Action Result/DescriptionForwarder Transparent Bridging for Ethernet LANsLearning Filtering LAN link WAN link Link errorForwarder Example StatisticsHardware Accelerator Functions HardwareAccelerator LAN/WAN Handlers Forwarder Functions Forwarder Initialization Aging Learn Only PeriodForwarder Database and Spanning Tree Using Filters Control menu located in the Main menu Multicast LinkFrame is dropped List, the frame is droppedBridge Link Number Transparent Bridge Configuration ParametersTB Forwarding Local MAC AddressBridge Filtering What is It? How Filtering is UsedParameter Action MAC Address FilteringParameter Action Value ParameterProcess MAC FilteringExample of a Frame Passing on a Bridge Link Mac Filtering Process Incoming and Outgoing FramesFirst Example How To Configure ExampleConfiguring the Bridge Link Record MAC Address Filtering ExamplesConfiguring the MAC Address Filter Table Address Links Why it is ImportantIdentifying Address Links for MAC Addressing Filtering works Series Switch SupportMAC Wildcard Filtering Categories Configuring the MAC Address Filter TableBroadcast frames in the LAN network Pass These parameters make up the MAC Address Filter TableIncoming Source Address Link Action PASS, BLOCK, PASSLIST, BlocklistIncoming Destination Address Link Action Outgoing Source Address Link ActionList of Links Outgoing Destination Address Link ActionProtocol Filtering These parameters make up the Protocol Filter Table Record Protocol FilterProtocol Value Protocol TypeProtocol SAP hex value Protocol OUI/IP hex valueOutgoing Protocol Link Action Incoming Protocol Link ActionDsap Values Parameter Actions Transparent Bridging NetBIOS Name FilteringBroadcasts to and from the SVR* name pattern Filters Checking NetBIOSForcing a Local Domain WithStep Action Configuring NetBIOS Name FilteringHow to Configure NetBIOS Name FilteringBridge Bridge Link Select Configure ConfigureStep Action Result Entry Number 1 appearsName Filter Table Configure NetBIOSNetBIOS Name Filter Table Bridge -NetBIOS Name FilterAscii Typical FilteringString Type Incoming NetBIOS Name List of Links Incoming NetBIOS Name Link ActionOutgoing NetBIOS Name List of LInks Outgoing NetBIOS Name Link ActionCheck Detailed NetBIOS Name Filtering StatisticsNetBIOS broadcasts filtered on the link Each bridge linkEither one of the following is true NetBIOS Packet FormatsIBM NetBIOS Formats When to Use NetBIOS Name Filtering All of the following are trueTree Configuration Stpe Control= Auto Stpe Control = Manual MenuSpanning Tree Protocol Entity Stpe Spanning TreeBridge Links Spanning Tree Protocol Entity Stpe Bridge Network Stpe Parameter Setting ConsiderationsExample of a Determining Root Links Designated Links Setting the Root Bridge Spanning TreeBridge ID equals Bridge Priority Value in hex + MAC Address Type of Network Speed Stpe Path Cost SVCs ConsiderNature Expected NumberTwo Bridge Links Between B3 and B4 Spanning Tree Protocol Entity Stpe Max Age Spanning Tree TimersTimer Parameters Hello TimerConsiderations OtherMessage Events in Network Bridge Forward Delay TimerSpanning Tree Protocol Entity Stpe Location and forwards packets to it properly Aging TimerBridges can adjust to the change LLC2 Local Termination Preventing session timeouts in a Bridging applicationAfter Local Well as network delaysTerminal session, causing Before LocalImproper LT SupportedTopologies Type Name Description Proper LT configurationLLC Protocol LLC Frame Description LLC2 Frame Description Local Termination does not spoof Local Termination spoofsBridging 105 Local Termination Configuring Local TerminationStation Table Entry Number Boot Type LLC LT StationStep LLC Profile Name WAN Parameters T1Reply TimerT2 Rx Ack Timer Local SAPN2 Retry Count Boot Type LLC LT WAN ParametersTi Inactivity Timer N3 ACK Delay CountHIGH, MEDIUM, LOW Configuration Entry NumberTx Window Size LCC LT WAN Data PriorityT1 Reply Timer 112 Bridging Deleting LT Configuration Records Mixed LAN Environment Limitations 27x switch, as shown in FigureMixed LAN Operation CTP Main menu, to activate Bridge link Select Configure BridgeBridge Link Parameters menu Bridge Link Parameters fromBothsrandtb Dual LAN Ethernet System powerupCmem RoutingSupported Dual Ethernet LANParameters For Details onLAN Server Subsystem Alarms Virtual Port’s MAC Address Configuring the LSS RecordExample of LCC RecordPath Trace Control ENABLE, DisableDisable Virtual Bridge IDStatistics Menu screen Bridge StatisticsTerm Description Spanning Tree StatisticsStpe Status Status reportParameter is MAN Disabled The Stpe is disabled. If Stpe ControlState AreDetailed Bridge Link Statistics First Detailed Bridge Link StatisticsScreen Terms RIF Description Bridge Link Filter SummaryLink Filter SummaryBridging 131 Shown in Figure Transparent Bridge Forwarding Table StatisticsStats Example Stats DescriptionsBridging 133 Terms-Transparent Bridge Second Transparent Bridge Detailed Bridge Link StatisticsReceived/transmitted of all types on this link FF-FF-FF-FF-FF-FFFrame Totals This is a count of the number of frames Detailed LAN Connection Statistics LAN Connection StatisticsStatistics Menu Detailed LAN Connection Statistics Second SVCs. The possible states are Blank for PVCs blank Explains why the last call was clearedLast clear diagnostic code This is the diagnostic code Connection and explains why the call was clearedBridging 139 Connection Summary Statistics Example of LAN shows the LAN Connection Summary StatisticsRemote MAC Addr LLC2 LT Session Summary StatisticsHeading Description SAPHeading Session Statistics LLC2 LT Detailed Session StatisticsField, ring number, and bridge number information Last Statistics Last time statistics were reset ResetRouting information field used in all frames transmitted Heading Description Local Station Session Summary Heading Description Remote Spoofer Session Summary Reset Statistics 148 Bridging Technical Support Country Data Rate Telephone Number Access by Analog Modem3ComFacts Automated Fax Service Access by Digital ModemCountry Telephone Number Support from3Com Country Telephone Number Fax Number Numerics IndexLAN OUI URL A-1 Index-5