2-23Chapter 2 Installing the Model 5399 Remote Access Concentrator ModuleNortel Networks 5399 Access Switch Hardware Installation GuideBooting the Remote Access ConcentratorYou can boot the operational software by downloading the image from ahost system or another Model 5399 Remote Access Concentrator, or byusing the image contained in Flash memory (self-boot). However, beforeactually booting the unit, you must first initialize the IP addressparameters either manually or by using the auto-initialize feature. Thefollowing sections describes the two methods of initializing the IP addressparameters, and the various boot methods.Auto-initializing the IP Address ParametersThe Remote Access Concentrator is distributed without an IP address orpreferred load host defined in ROM. When the device is booted, theRemote Access Concentrator attempts to auto-initialize itself usingBOOTP (bootstrap protocol) and RARP (Reverse Address ResolutionProtocol).This method of initializing the IP address parameters isgenerally done when booting from a host system (not whenself-booting).The Remote Access Concentrator supports the BOOTP and RARPprotocols. Use these protocols to obtain boot information from a UNIXhost without requiring any manual set-up on the Remote AccessConcentrator.• BOOTP allows a diskless client to determine its IP address,the IP address of the server, and the name of the file to beloaded into memory.• RARP maps a hardware address into an IP address.The ROMs invoke this system of acquiring boot information when a bootis initiated and the Remote Access Concentrator is not initialized. Underthis condition, the Remote Access Concentrator first tries to get bootinformation via BOOTP or RARP.
