Avaya M-ACCF/SF manual Network Layer Concepts LAN Emulation, LAN Emulation Overview

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Chapter 1	Overview

Network Layer Concepts — LAN Emulation

The following Sections describe the LAN emulation and ATM adaptation concepts behind the network layer architecture of a typical ATM network.

Chapter 2 describes how to plan your ATM network and provides some examples of where to use the ATM access module within an ATM network.

LAN Emulation Overview

LAN Emulation (LANE) is a method of connecting LAN users over an ATM network which enables them to communicate with each other as if they were operating over traditional LANs. LANE can be configured in an ATM network in several ways:

•To connect legacy end stations directly to other legacy systems, as well as to servers, routers, switches and other networking devices attached to the ATM network.

•To connect bridged-LAN environments to each other over ATM. In this case the Emulated LAN acts as a bridge on the ATM network.

•To connect ATM end stations to each other, enabling communication between them.

More than one emulated LAN can operate on the same ATM network. However, each of the emulated LANs is independent of the others and users cannot communicate directly across emulated LAN boundaries.

Emulated LAN Components

LAN Emulation is implemented as a set of connection services collectively called an emulated LAN (ELAN). Each ELAN is composed of a set of LAN Emulation Clients (LEC) and a single LAN Emulation Service. The latter consists of a LAN Emulation Configuration Server (LECS), a LAN Emulation Server (LES), and a Broadcast and Unknown Server (BUS).

LAN Emulation Client (LEC)

Each LEC is incorporated in an ATM edge device, such as the M-ACC module and represents a set of the device’s LAN users to the ATM network. A LEC has a unique LEC ID as well as an ATM address by which it is known in the emulated LAN. It handles the forwarding of its LAN users’ data frames over the ATM network to their destination, a task which also includes ascertaining the destination LEC address and setting up the connection between them.

Also provided is a MAC-level emulated Ethernet service interface to higher level software which implements the LAN Emulation User to Network Interface (LUNI).

An ELAN is assigned a name (ELAN name). A LEC joining an ELAN may use the ELAN name in the configuration or join phase.

Avaya M770 M-ACCF/SF ATM Access Modules User’s Guide

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Contents ACCF/SF Module Page ATM Terminology IntroductionFinding Information in This Guide Conventions Page Contents Contents Avaya M770 M-ACCF/SF ATM Access Modules User’s Guide Iii Contents Contents Page Port Submenu Display Results List of FiguresManagement Submenu ATM Submenu Snmp SubmenuList of Tables Page ATM Benefits ATM Access ModulesFeatures and Benefits OverviewLAN Emulation Lane version Avaya M770 Frame Switch DomainsATM Access Module Features Wire Rate Transmission on ATM portLAN Emulation Client LEC Network Layer Concepts LAN EmulationLAN Emulation Overview Emulated LAN ComponentsLAN Emulation Server LES LAN Emulation Configuration Server LecsBroadcast and Unknown Server BUS Control VCCs Emulated LAN ConnectionsData VCCs Flush Protocol Frame OrderingOperation of the LAN Emulation Connecting a LEC to an ElanRegistration Connection Processes of the LEC to Lane ServerConnection Management Address ResolutionLAN Emulation Components in Your Network An Example LAN Emulation and Avaya DevicesMapping Ethernet and ATM Addresses Joining the ElanLEC must know the name of the Elan it is to join Locating the LecsIf the destination MAC address is listed in the ARP Table Address ResolutionWhat Happens to Unicast Frames? LAN Emulation Address Resolution Protocol LearpWhat Happens to Broadcast and Multicast Frames? Layered Network Architecture Network Layer Concepts ATM & ATM AdaptationATM Adaptation Layer AAL Asynchronous Transfer Mode ATM LayerATM Basics Service Processing ATM is Service Transparent10 Communication Channels ATM is Connection-OrientedVirtual Path Identifier VPI Virtual Channel Identifier VCI 11 Connection TerminologySwitched Virtual Circuits SVCs 12 Switching Cells Using VPI and VCI ValuesInterim Local Management Interface Ilmi ATM InterfacesNetworkhostidentifier ATM Address RegistrationATM Layer and Cell Structure 15 ATM Cell Structure Extending VLANs into the ATM Network Physical Layer16 Vlan to Elan Mapping 17 Extending VLANs into the ATM Network Putting Your ATM Network Together ApplicationsPlanning Your Network Does your network conform to the ATM configuration rules? ATM Configuration RulesWill you have sufficient Elan resources? What logical network domains, VLANs, do you wish to set up?Are the LAN Emulation services configured correctly? Extending VLANs Through the ATM NetworkATM Connections Within Your Network ATM Backbone in the Building Network Configuration ExamplesATM Backbone in the Building Avaya M770 Multitechnology Functionality Avaya M770 Multitechnology FunctionalityRouting in the X-Switch Domain Routing in the X-Switch DomainInstalling the M-ACC Module InstallationSafety Information Agency Approval Pre-installation ProcedureSingle-mode Module Laser Classification Multi-Mode Module LED WarningAvaya M770 Module DRU Budget Domain Usage ConsiderationsBudget Calculation Examples DRU Budget Information Window DRU Budget Information WindowInstalling the Module Inserting the Module into the Hub Connecting a Cable to the ATM PortCAM Contents Addressable Memory tests Power On Self TestRemoving an Existing ATM Access Module M-ACC LEDs Descriptions Post-Installation ChecksConnecting to the Serial Port Configuring the M-ACC ModuleACC Module Default Settings M-ACC Module Default SettingsFor example telnet Establishing a Telnet SessionTo connect to the M-SPX/S Console port Setting up the M-ACC ModuleATM IP Configuration Module Setup Main MenuAssigning the M-ACC module IP address, Gateway and Netmask Setting up the ATM Access Module There is no need to perform a reset. Configuration ExampleMLS Bridging Accmmls SwitchIntroduction Switch CLI & ATM Terminal InterfaceSwitch Command Line Interface CLI ACC ATM Access Module Terminal Menu InterfaceConventions Used Commands Summary Table Switch Command Line Interface CLIReset the Module Entering Software Download Parameters Software Download to the X-Switch CPUMonitoring the Software Download Process Starting the Software Download ProcessSet Primary Version Set Defaults to Factory SettingsCreate Report Clear Mac Address Table Configuration CopyAssigning the M-ACC module IP address, Gateway and Netmask Logging On Commands Tree ChartLogging Off Managing the ATM Access ModuleSubmenus Menu Structure of the ATM Access Module Main Menu Options Configuring System ParametersSystem Menu Initialize Submenu 1,2 Passwords Submenu 1,3Reset Submenu1,4 Display Submenu 1,1Display Flash Log Messages Submenu 1,5,1 System Logger Submenu 1,5Operational Meanings of Display Flash Log Submenu Items Operational Meanings of Display Memory Submenu Items Display Memory Log Messages Submenu 1,5,2ATM access module Configuration Configuring an ATM PortSystem Software Download Submenu 1,6 Operational Meanings of Port Submenu Items Port Submenu 2,1VCC Submenu 2,2 ATM Port Physical Submenu 2,1,6Aging Submenu 2,2,4 VCC Submenu Items and their Operational MeaningsSnmp Configuration Submenu 3,2 Administering IP and Snmp ManagementIP Submenu 3,1 Configure Submenu Items and their Operational Meanings 18 updSysAtt Submenu 3,2,6 20 Virtual net Submenu VN Configuration MenuLEC ATM VlanVlan Elan ID ElanLES ATM LECDownloading Setting up an ATM VLAN/ELANUpgrading Software PreliminariesATM Port Statistics Monitoring the ATM Access ModulePort Statistics Display Items and their Meanings 22 ATM Port Statistics ScreenStatistics Display Items and their Meanings VCC StatisticsCajunView M770 Device Manager version Network Management and MonitoringCajun LANEMaster version Running M770 Manager from HP Windows NT CajunView M770 Device ManagerStarting the M770 Manager Running M770 Manager from HP-OV for WindowsOverview LANEMasterStarting Cajun LANEMaster Overview Cajun LANEMaster ViewsCajun LANEMaster Window Page ATM Cable Specification SpecificationsACC ATM Access Module Technical Specifications Environmental, Safety, and EMC SpecificationsSDH Standard Supported Table A.3 Standard Multi-mode Cable SpecificationsOptical Standard Supported ATM ForumEIA-492CAAA Table A.4 Standard Multi-mode Cable SpecificationsImportant Safety Information Safety InformationTable B.1 Troubleshooting Tips TroubleshootingELAN/VLAN Page SAR IndexNumerics ATM WANText ATM VLAN/ELAN LearpLuni LESVCC United States How to Contact UsEmea Europe, Middle East and Africa Region UAE AP Asia Pacific Region Avaya.com