Joining the Elan, Locating the Lecs | IBM ATM OC-3c specification

Joining the ELAN

Before a LAN Emulation Client (LEC) can transmit any Ethernet frames onto the ATM network it must first join an ELAN. To join the ELAN:

1The LEC must know the name of the ELAN it is to join.

The ELAN name is specified through the management software on the Switch.

2The LEC must communicate with the LAN Emulation Server (LES) that is serving that ELAN.

To communicate with the LES, the LEC must first locate the LES. The LEC can find the ATM address of the LES in one of the following ways:

■If there is a LAN Emulation Configuration Server (LECS) on the network, the LEC gets the address of the LES from the LECS.

The way in which the LECS determines which LES the LEC needs to communicate with, depends on the policy that the LECS is running. Refer to the user guide that accompanies your LECS for more details of the policies your LECS uses.

■If the network does not have a LECS, the LEC gets the LES address from the management software on the ATM device.

3The LEC must have a connection to the Broadcast and Unknown Server (BUS).

When the LEC has joined the LES, the LES helps the LEC locate the Broadcast and Unknown Server (BUS) associated with that ELAN.

What is LAN Emulation (LANE)?

2-5

Locating the LECS

Before the LEC can ask the LECS for the address of the LES, the LEC must first locate the LECS. There are three ways in which the LEC can locate the LECS, and the LEC tries these methods in the following order:

■The LEC can ask the adjacent ATM Switch using the Interim Local Management Interface (ILMI).

■The LEC can use a well known ATM address that is reserved for the LECS. The well known address is pre-programmed into most LECS devices. The well known address is:

47007900000000000000000000:00A03E000001:00

■The LEC can use a reserved Permanent Virtual Circuit (PVC) which the ATM Switch has already routed to the LECS. The reserved PVC is

VPI 0, VCI 17.

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IBM ATM OC-3c manual Joining the Elan, LEC must know the name of the Elan it is to join, Locating the Lecs

Contents

User’s Guide Research Triangle Park NC First Edition October Contents Accessing Management Features Screen Map Glossary Bibliography Page Introduction About this GuideTerminology ATM Terminology Conventions Finding Information in This GuideTask Location Icon Alerts you to Bold Related Documentation About this Guide ATM Benefits Features and Benefits Wire Rate Transmission on ATM port ATM Module Features Layered Network Architecture Network Layer Concepts Upper Layer Protocols What is LAN Emulation LANE? LAN Emulation Components LAN Emulation Configuration Server LecsLAN Emulation Client LEC LAN Emulation Server LES LAN Emulation and IBM Devices LAN Emulation Components in Your Network Locating the Lecs Joining the ElanLEC must know the name of the Elan it is to join If the destination MAC address is listed in the ARP Table Address ResolutionMapping Ethernet and ATM Addresses What Happens to Broadcast and Multicast Frames? LAN Emulation Address Resolution Protocol LearpWhat Happens to Unicast Frames? ATM is Cell-based Asynchronous Transfer Mode ATM LayerATM Adaptation Layer AAL ATM is Connection-oriented ATM is Service Transparent Virtual Path Identifier VPI Virtual Channel Identifier VCI 7Switching Cells using VPI and VCI values Permanent Virtual Circuits PVCs Switched Virtual Circuits SVCsATM Interfaces Networkhostidentifier Interim Local Management Interface IlmiATM Address Registration 10ATM Cell Structure ATM Layer and Cell Structure Sonet STS-3c Physical Layer 16CHAPTER 2 Network Layer Concepts Virtual LAN Concepts What is a Virtual LAN VLAN?Creating Inter-switch VLANs 2VLAN to Elan Mapping Extending VLANs into the ATM Network Extending VLANs into the ATM Network 4CHAPTER 3 Virtual LAN Concepts Planning Your Network Putting Your ATM Network TogetherDoes your existing ATM network have sufficient resources? Can your ATM devices communicate with each other? Extending VLANs Through the ATM Network ATM Configuration Rules ATM Connections Within Your Network Are the LAN Emulation services configured correctly? 1SVC Signalling Not Supported in Remote Edge-device ATM Backbone in the Building Network Configuration Examples Campus Configuration Campus Configuration Making a Building Resilient to Network Failure 3Resilient Link Configuration Following Safety Information Installing and Setting UP the Module Ebezpečí Îïàñíî Device Support Pre-installation ProcedureCheck the Power Supply 1Fitting the ATM Module Installation Connecting a cable to the ATM Port Post-Installation ChecksPowering Up the Switch Power On Self Test Post LED Summary Checking the Physical Connections Checking the Power SupplyChecking that the ATM Module is Installed Correctly 8CHAPTER 6 Installing and Setting UP the Module Screen Map Accessing Management FeaturesKeyboard Shortcuts Correcting Text Entry Screen Map Main Banner Logging On Automatic Logout User Name Default Access Level PasswordLogging Off 1Management Screen Map Managing the ATM Module 2ATM Module Configuration Screen Configuring an ATM Port Desired Value of VPI Number of bits Required Configuring an ATM Port 3ATM LEC Setup Screen Displaying all VLANs 4Switch Management Screen 5VLAN Selected Screen ATM Port Setup Problem Solution 7ATM Port Setup Screen 8ATM ARP Table Screen Mapping Far End MAC Addresses Mapping Far End MAC Addresses Creating a MAC Address to ATM Entry Finding an Address Entry Displaying an ATM ConnectionUpdating Address Entries Deleting an Address Entry Finding an ATM Connection Setting Up Resilient Links Upgrading Software 10Software Upgrade Screen Error Messages Active Status MessagesDownload successful Load Paused 1Status Monitoring Screen Map Monitoring the ATM Module MonitoringUse Statistics OverviewPhysical Connection ATM Physical Layer Statistics screen ATM Port Statistics 2Switch Management Screen 4CHAPTER 9 Monitoring the ATM Module 4ATM Vlan LEC Status Screen ATM Vlan LEC Status Timeout State Possible Causes Possible Solutions NoneUndefined Error LEC State Description State Possible Causes Possible Solutions Duplicated ATM State Possible Causes Possible Solutions Invalid RequestParameters Duplicate LAN State Possible Causes Possible Solutions Invalid State Possible Causes Possible Solutions InsufficientAccess Denied No Configuration Error State Possible Causes Possible SolutionsConfiguration Connecting to BUS Following button is available on this screen ATM Physical Layer Statistics ATM Physical Layer Statistics Using Physical Layer Statistics to Troubleshoot ATM Physical Layer Statistics 14CHAPTER 9 Monitoring the ATM Module World Trade Safety Information Safety InformationSafety Notices 2APPENDIX a Safety Information Safety Notices Neodstraňujte desky modulů, pokud je připojeno napájení Safety Notices 6APPENDIX a Safety Information Safety Notices 8APPENDIX a Safety Information Screen Access Rights 2APPENDIX B Screen Access Rights ATM Cable Specification ATM Module Technical SpecificationsEnvironmental Specifications Numerical Aperture Specification DescriptionDoes the Cable Provide Sufficient Bandwidth? Example 4APPENDIX C ATM Module Technical Specifications How to Use this Guide to Troubleshoot Troubleshooting Using LEDs Identifying the Problem Figure D-1Troubleshooting Flow Diagram Are there Physical Layer Errors? Access the Physical Layer Statistics Screen Check the Physical Connections Access the ATM Port Setup Screen Enable the ATM Port Is the ATM Port Enabled?Access the ATM Port Statistics Screen Are Cells being transmitted and received? Is the ATM Switch Using AAL5? Access the ATM Vlan LEC Status ScreenIs the LEC ATM Address Valid for the Default VLAN? Is Signalling Compatible? Access the ATM Module Configuration ScreenMake Signalling Compatible Both Devices Must be AAL5 Compliant Make Ilmi VPI/VCI Same at Both Ends of the Link Is the Ilmi Connection Set Up Correctly?Are the MAX VPI and VCI Bits Compatible? Make the MAX VPI and VCI Bits Compatible Operational Why has the LEC Operation Failed? State Possible Causes LEC is trying to join Is the LEC Operational Now? Has the Problem been Solved? Elan Configuration ProblemsAre the LECs on the Same Emulated LAN? Re-map or Route the LEC Enter the MAC Address in the Switch Database Is the MAC Address in the Switch Database?Is There Still a Problem? Use routing Solving Known Problems Switch powers up but then Power Supply ProblemsShuts itself down after a Few minutes Self Test Post Power On Self Test Post FailureATM Module Fails Power on Far End Status LED indicates Cable Connection Problems Connections ATM ProblemsOnly showing reserved ATM Communicate with each Vlan or Elan ProblemsOther Insufficient Resources Example To clean the cable connectors Cleaning Dirty Fiber Optic ConnectorsTo clean fiber optic connectors on the ATM Module Electronic Support Technical Support and ServiceVoice Support IBM Bulletin Board System 2APPENDIX E Technical Support and Service Trademarks Production Status Statement of Limited WarrantyIBM Warranty for Machines Extent of Warranty Warranty Service Limitation of Liability Federal Communications Commission FCC Statement Electronic Emission Notices European Union EU Statement Information To The User How to Identify and Resolve Radio-TV Interference Problems ATM Forum ATM SwitchGlossary Cell ByteCell Header Connectionless Link LAN Emulation Lane Octet MultiplexOC-n Payload UNI Telnet Virtual Channel VCI Bibliography Asynchronous Transfer Mode ATMLAN Emulation Lane Books Bibliography ATM Index SDH STM-1 Sonet Index