Bridging | EXP Computer S200 instruction

LLC2 Local Termination

N3 ACK Delay Count

Range:	1 to 15

Default:	3

Description:	The Receive Count is used with T2 to reduce the number of
	acknowledgments a station generates. The receive count is used by
	a station to determine how many frames it receives from the
	remote station while withholding acknowledgment of these
	frames. This reduces the number of acknowledgments generated
	by a link station. When this counter expires, the link station
	immediately sends an acknowledgment for all received frames not
	yet acknowledged.

Boot Type:	Tables and Node Record.

Tx Window Size

Range:	1 to 15

Default:	7

Description:	Specifies the maximum number of I frames a station may transmit
	without acknowledgment.

Boot Type:	Tables and Node Record.

112

Bridging

Image 116

EXP Computer S200 manual 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 WAN or Permanent Virtual Circuit PVC for Frame Relay Basic Remote Bridging ExamplesAcross a WAN 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 Bridge WAN Data Priority used for Ethernet only Learn Only Period used for Ethernet onlyAging Period 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 Stpe Link State Netbios Name Filter ActionProtocol Filter Action 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 Forwarder Transparent Bridging for Ethernet LANsLearning LAN link WAN link Link error Forwarder ExampleStatistics Filtering Hardware Accelerator Functions HardwareAccelerator LAN/WAN Handlers 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 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 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 Transparent Bridging NetBIOS Name FilteringBroadcasts to and from the SVR* name pattern 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 Ascii Typical FilteringString Type 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 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 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 Location and forwards packets to it properly Aging TimerBridges can adjust to the change Preventing session timeouts in a Bridging application LLC2 Local Termination Well as network delays Terminal session, causingBefore Local After Local Improper LT SupportedTopologies Type Name Description Proper LT configurationLLC Protocol LLC Frame Description LLC2 Frame Description Local Termination spoofs Local Termination does not spoof Bridging 105 Configuring Local Termination Local Termination Station Table Entry Number Boot Type LLC LT StationStep 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 Mixed LAN Environment Limitations 27x switch, as shown in FigureMixed LAN Operation 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 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 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 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 Access by Analog Modem 3ComFacts Automated Fax ServiceAccess by Digital Modem Country Data Rate Telephone Number Country Telephone Number Support from3Com Country Telephone Number Fax Number Index Numerics LAN OUI URL A-1 Index-5