Server’s Destination MAC Address Not on LAN AAA | EXP Computer S200

Configuring the PathBuilder S200 Series Switch for Bridging Operation

Frame

PC

?

PC

	LAN	PB S200
?	AAA	PB S200

PC

							PC
	?				?

Figure 22. Server’s Destination MAC Address Not on LAN AAA

3)After receiving no response on the local LAN, the PC uses Source Route Bridging (SRB) to find the path to the remote server. The PC can resend the TEST frame indicating that the frame is to be bridged over all routes.

The PC resends an All Route Explorer (ARE) TEST frame via its SRB software (Figure 23).

PC ?

LAN

AAA

PB S200

ARE Frame

Figure 23. All Route Explorer (ARE) Frame Searches the Network for the Server

4)The TEST frame includes the following:

•Destination Address is server's MAC Address.

•Routing Information Indicator bit (RII) is set to one. This bit is the most significant bit in the source address, indicating this frame has a Routing Information Field (RIF).

•Three bits in the Routing Information Field (RIF) indicate this is an ARE. This instructs all bridges that encounter this frame to forward the frame to their destination LANs. This form of broadcast ensures that at least one copy of the frame arrives at the destination.

•Routing Information Field (RIF) shows the path (LAN number/Bridge number, LAN number/Bridge number, etc.) that each ARE frame took on its search between the source and the destination.

Bridging

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Release 5.2M

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EXP Computer S200 manual Server’s Destination MAC Address Not on LAN AAA

Contents

3Com Corporation Restricted Rights Legend Restricted Rights Notification for U.S. Government Users Proprietary Material Page Multiple LANs SolutionsOverview Functionality Transparent TranslationalBridging No Local Bridging This Manual Topic This Notice Topic Bridging Primer Bridging Features and CapabilitiesSwitches Introduction Ethernet LAN WAN application, but you can also bridge across an X.25 WAN ExampleEthernet Bridge Operation Mixed LAN Bridging MAC Addressing LT Example LLC2 Local TerminationLLC2 Local Termination Autolearn for Local Termination Filtering NetBIOS NameFiltering Mac Address Spanning Tree Protocol What Is It? Automatic Manual Spanning Tree Support Dual 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 Interface Bridging Interface Connections Between WAN and LAN Setting Up WAN Operation for Bridging Setting Up WAN Operation for Bridging Configure Maximum Number of Bridge Links Bridge ParametersParameters These parameters make up the Bridge Parameter Record MAN Bad Hello TimeoutStpe Control AUTO, MAN Bridge 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 it SR, TB, Bothsrandtb These parameters make up the Bridge Link RecordEntry Number BridgeType NONE, PASS, Block Hop Count LimitLargest Frame Size MAC Address Filter Action Stpe Link State Netbios Name Filter ActionProtocol Filter Action Virtual Ring Number Link ModeNORMAL,RFC1294, Trans Normal Table Parameters LAN Connection TableOver the WAN LAN Connection LAN Connection Type LAN Forwarder TypeROUT, BRID, Brout Rout Lcon Queue Limit Encapsulation TypeCodex Autocall Mnemonic Traffic Priority Billing RecordsOFF, on OFF Transmission times for large frames become significant Where bridging is done remotely across a WANLimiting Bridge Frame Sizes Overview Max Frame Size Line Speed Range kbps Standard FrameSizes Maximum frame size Configuring Translational Bridging Translational Bridging Example Bridge Frame Handling Individual Bridge Configuring Source Route Bridging OperationConfiguring Node for SRB Bridging Located on remote LAN CCC Figure Connecting a Station to a Server in Source Route BridgingProcedure LAN for a Source Route Bridging operation 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 Then Step Action Result/Description Forwarder Transparent Bridging for Ethernet LANsLearning Filtering LAN link WAN link Link errorForwarder Example Statistics Hardware Accelerator Functions HardwareAccelerator LAN/WAN Handlers Forwarder Functions Forwarder Initialization Aging Learn Only Period Forwarder Database and Spanning Tree Using Filters Control menu located in the Main menu Multicast LinkFrame is dropped List, the frame is dropped Bridge Link Number Transparent Bridge Configuration ParametersTB Forwarding Local MAC Address Bridge Filtering What is It? How Filtering is Used Parameter Action MAC Address Filtering Parameter Action Value Parameter Process MAC Filtering Example of a Frame Passing on a Bridge Link Mac Filtering Process Incoming and Outgoing Frames First Example How To Configure ExampleConfiguring the Bridge Link Record MAC Address Filtering Examples Configuring 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, Blocklist Incoming Destination Address Link Action Outgoing Source Address Link Action List of Links Outgoing Destination Address Link Action Protocol Filtering These parameters make up the Protocol Filter Table Record Protocol Filter Protocol Value Protocol TypeProtocol SAP hex value Protocol OUI/IP hex value Outgoing Protocol Link Action Incoming Protocol Link Action Dsap Values Parameter Actions Transparent Bridging NetBIOS Name FilteringBroadcasts to and from the SVR* name pattern Filters Checking NetBIOSForcing a Local Domain With Step Action Configuring NetBIOS Name FilteringHow to Configure NetBIOS Name Filtering Bridge Bridge Link Select Configure ConfigureStep Action Result Entry Number 1 appears Name Filter Table Configure NetBIOSNetBIOS Name Filter Table Bridge -NetBIOS Name Filter Ascii Typical FilteringString Type Incoming NetBIOS Name List of Links Incoming NetBIOS Name Link Action Outgoing NetBIOS Name List of LInks Outgoing NetBIOS Name Link Action Check Detailed NetBIOS Name Filtering StatisticsNetBIOS broadcasts filtered on the link Each bridge link Either one of the following is true NetBIOS Packet FormatsIBM NetBIOS Formats When to Use NetBIOS Name Filtering All of the following are true Tree Configuration Stpe Control= Auto Stpe Control = Manual MenuSpanning Tree Protocol Entity Stpe Spanning Tree Bridge 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 Number Two Bridge Links Between B3 and B4 Spanning Tree Protocol Entity Stpe Max Age Spanning Tree TimersTimer Parameters Hello Timer Considerations Other Message Events in Network Bridge Forward Delay Timer Spanning 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 application After Local Well as network delaysTerminal session, causing Before Local Improper LT SupportedTopologies Type Name Description Proper LT configurationLLC Protocol LLC Frame Description LLC2 Frame Description Local Termination does not spoof Local Termination spoofs Bridging 105 Local Termination Configuring Local Termination Station Table Entry Number Boot Type LLC LT StationStep LLC Profile Name WAN Parameters T1Reply TimerT2 Rx Ack Timer Local SAP N2 Retry Count Boot Type LLC LT WAN ParametersTi Inactivity Timer N3 ACK Delay Count HIGH, MEDIUM, LOW Configuration Entry NumberTx Window Size LCC LT WAN Data Priority T1 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 from Bothsrandtb Dual LAN Ethernet System powerup Cmem RoutingSupported Dual Ethernet LAN Parameters For Details on LAN Server Subsystem Alarms Virtual Port’s MAC Address Configuring the LSS RecordExample of LCC Record Path Trace Control ENABLE, DisableDisable Virtual Bridge ID Statistics Menu screen Bridge Statistics Term Description Spanning Tree StatisticsStpe Status Status report Parameter is MAN Disabled The Stpe is disabled. If Stpe ControlState Are Detailed Bridge Link Statistics First Detailed Bridge Link Statistics Screen Terms RIF Description Bridge Link Filter SummaryLink Filter Summary Bridging 131 Shown in Figure Transparent Bridge Forwarding Table StatisticsStats Example Stats Descriptions Bridging 133 Terms-Transparent Bridge Second Transparent Bridge Detailed Bridge Link Statistics Received/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 cleared Bridging 139 Connection Summary Statistics Example of LAN shows the LAN Connection Summary Statistics Remote MAC Addr LLC2 LT Session Summary StatisticsHeading Description SAP Heading Session Statistics LLC2 LT Detailed Session Statistics Field, 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 Modem Country Telephone Number Support from3Com Country Telephone Number Fax Number Numerics Index LAN OUI URL A-1 Index-5