3-9Configuring an Emulated LAN3.4.1 Configuring an LECS Configuration Database FileThe LECS uses a text configuration file to contain the configuration informa-tion needed by LECs that wish to participate in an ELAN. The LECS configu-ration file may be built and edited using a text editor such as vi or emacs.3.4.1.1 Before You BeginBefore building or modifying the LECS configuration file, you should firstdetermine the topology of the ELAN or ELANs that you want to administer.You must supply the following information when building or editing theLECS configuration file:• Provide the name of each ELAN (engineering, marketing, etc.).• Provide the ATM address of the LES for each ELAN.• If LEC failover is to be made available to clients on a given ELAN, theATM addresses for all LESs in that ELAN’s failover sequence must beincluded.• Provide the address of each LEC that may participate in each ELAN.• If you wish LECs to use a default ELAN, the default LES informationmust also be included.• Provide various other configurable parameters.CAUTION Do not attempt to edit an existing functionalLECS configuration file without first making abackup copy of the file. Incorrect modificationof the configuration file could result in loss ofcommunication between one or more mem-bers of a defined ELAN. It may also result inone or more of the ELAN(s) defined in the filegoing “down”.NOTE: You may make changes to the LECSconfiguration file while the LECS process isrunning. The configuration file is rereadperiodically by the LECS process (the defaultperiod is ten minutes). Consequently, anychanges that you make to the configurationfile are not recognized until the file is reread.
