Avaya M-ACCF/SF Address Resolution, If the destination MAC address is listed in the ARP Table

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Chapter 1	Overview

Figure 1.7 LAN Emulation Clients and Ethernet Hosts

Hosts with

MAC Addresses

Avaya M770

Multifunction Switch

ATM Port with 16 LAN Emulation Clients (LECs) each with an ATM Address

ATM Access

Module

These clients represent (act as a proxy for) devices connected to the Ethernet ports.

Whenever an Ethernet device wants to communicate with another device over the ATM network, the LEC must first discover the ATM address of the LEC that is acting as a proxy for the destination MAC address. The LEC must do this for each unicast Ethernet frame sent. The process is known as Address Resolution.

Address Resolution

The process by which a LEC associates a LAN destination address with the ATM address of another LEC (or the BUS) is known as Address Resolution.

Each LEC keeps a LAN Emulation ARP Table (which should not to be confused with the IP ARP Table). The ARP Table lists the remote destination MAC addresses and the ATM address of the LEC through which each destination MAC address can be reached.

Prior to sending a frame with a known destination, the LEC checks the ARP Table to see if the destination MAC address of the frame is listed in the ARP Table. The action the LEC then takes depends on whether the MAC address is listed in the ARP Table:

•If the destination MAC address is listed in the ARP Table:

—and there is an ATM connection to that LEC, the frame is sent directly to that LEC.

—and an ATM connection has not already been set up, the LEC sets up an ATM connection.

•If the destination MAC address is not listed in the ARP Table:

the LEC sends the frame to the BUS. The BUS then sends the frame to all LECs on the Emulated LAN.

Sending a frame to every LEC is an inefficient use of resources, so the LEC also tries to locate the MAC address for future use.

To discover the correct address, the LEC uses a process called LAN Emulation Address Resolution Protocol (LE_ARP).

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 Management Submenu List of FiguresPort Submenu Display Results ATM Submenu Snmp SubmenuList of Tables Page Features and Benefits ATM Access ModulesOverview ATM BenefitsATM Access Module Features Avaya M770 Frame Switch DomainsWire Rate Transmission on ATM port LAN Emulation Lane versionLAN Emulation Overview Network Layer Concepts LAN EmulationEmulated LAN Components LAN Emulation Client LECBroadcast and Unknown Server BUS LAN Emulation Configuration Server LecsLAN Emulation Server LES 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 ServerLAN Emulation Components in Your Network Address ResolutionConnection Management An Example LAN Emulation and Avaya DevicesLEC must know the name of the Elan it is to join Joining the ElanLocating the Lecs Mapping Ethernet and ATM AddressesIf the destination MAC address is listed in the ARP Table Address ResolutionWhat Happens to Broadcast and Multicast Frames? LAN Emulation Address Resolution Protocol LearpWhat Happens to Unicast Frames? Layered Network Architecture Network Layer Concepts ATM & ATM AdaptationATM Basics Asynchronous Transfer Mode ATM LayerATM Adaptation Layer AAL 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 InterfacesATM Layer and Cell Structure ATM Address RegistrationNetworkhostidentifier 15 ATM Cell Structure Extending VLANs into the ATM Network Physical Layer16 Vlan to Elan Mapping 17 Extending VLANs into the ATM Network Planning Your Network ApplicationsPutting Your ATM Network Together Does your network conform to the ATM configuration rules? ATM Configuration RulesAre the LAN Emulation services configured correctly? What logical network domains, VLANs, do you wish to set up?Extending VLANs Through the ATM Network Will you have sufficient Elan resources?ATM 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 DomainSafety Information InstallationInstalling the M-ACC Module Single-mode Module Laser Classification Pre-installation ProcedureMulti-Mode Module LED Warning Agency ApprovalBudget Calculation Examples Domain Usage ConsiderationsAvaya M770 Module DRU Budget DRU Budget Information Window DRU Budget Information WindowInstalling the Module Inserting the Module into the Hub Connecting a Cable to the ATM PortRemoving an Existing ATM Access Module Power On Self TestCAM Contents Addressable Memory tests M-ACC LEDs Descriptions Post-Installation ChecksACC Module Default Settings Configuring the M-ACC ModuleM-ACC Module Default Settings Connecting to the Serial PortFor example telnet Establishing a Telnet SessionTo connect to the M-SPX/S Console port Setting up the M-ACC ModuleAssigning the M-ACC module IP address, Gateway and Netmask Module Setup Main MenuATM IP Configuration Setting up the ATM Access Module There is no need to perform a reset. Configuration ExampleMLS Bridging Accmmls SwitchSwitch Command Line Interface CLI Switch CLI & ATM Terminal InterfaceACC ATM Access Module Terminal Menu Interface IntroductionConventions 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 ProcessCreate Report Set Defaults to Factory SettingsSet Primary Version Clear Mac Address Table Configuration CopyAssigning the M-ACC module IP address, Gateway and Netmask Logging On Commands Tree ChartSubmenus Managing the ATM Access ModuleLogging Off Menu Structure of the ATM Access Module System Menu Configuring System ParametersMain Menu Options Reset Submenu1,4 Passwords Submenu 1,3Display Submenu 1,1 Initialize Submenu 1,2Operational Meanings of Display Flash Log Submenu Items System Logger Submenu 1,5Display Flash Log Messages Submenu 1,5,1 Operational Meanings of Display Memory Submenu Items Display Memory Log Messages Submenu 1,5,2System Software Download Submenu 1,6 Configuring an ATM PortATM access module Configuration 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 MeaningsIP Submenu 3,1 Administering IP and Snmp ManagementSnmp Configuration Submenu 3,2 Configure Submenu Items and their Operational Meanings 18 updSysAtt Submenu 3,2,6 20 Virtual net Submenu VN Configuration MenuVlan Elan ID VlanElan LEC ATMLES ATM LECUpgrading Software Setting up an ATM VLAN/ELANPreliminaries DownloadingATM Port Statistics Monitoring the ATM Access ModulePort Statistics Display Items and their Meanings 22 ATM Port Statistics ScreenStatistics Display Items and their Meanings VCC StatisticsCajun LANEMaster version Network Management and MonitoringCajunView M770 Device Manager version Starting the M770 Manager CajunView M770 Device ManagerRunning M770 Manager from HP-OV for Windows Running M770 Manager from HP Windows NTStarting Cajun LANEMaster LANEMasterOverview Overview Cajun LANEMaster ViewsCajun LANEMaster Window Page ACC ATM Access Module Technical Specifications SpecificationsEnvironmental, Safety, and EMC Specifications ATM Cable SpecificationOptical Standard Supported Table A.3 Standard Multi-mode Cable SpecificationsATM Forum SDH Standard SupportedEIA-492CAAA Table A.4 Standard Multi-mode Cable SpecificationsImportant Safety Information Safety InformationELAN/VLAN TroubleshootingTable B.1 Troubleshooting Tips Page Numerics IndexATM WAN SARText Luni LearpLES ATM VLAN/ELANVCC Emea Europe, Middle East and Africa Region How to Contact UsUnited States UAE AP Asia Pacific Region Avaya.com