3Com® VCX V7111 VoIP Gateway User Guide 303NFSServers 2 = 192.168.100.7, /d/shared, 2 ;[ \NFSServers ]CptFileUrl = 'file://10.31.2.10/usr/share/public/usa_tones.dat'VpFileUrl = 'file://192.168.100.7/d/shared/3Com/voiceprompt.dat'Startup ProcessThe startup process (illustrated in Figure 112) begins when the gateway is reset (physicallyor from the Web / SNMP) and ends when the operational software is running. In the startupprocess, the network parameters, software and configuration files are obtained.After the gateway powers up or after it is physically reset, it broadcasts a BootRequestmessage to the network. If it receives a reply (from a BootP server), it changes its networkparameters (IP address, subnet mask and default gateway address) to the values provided.If there is no reply from a BootP server and if DHCP is enabled (DHCPEnable = 1), thegateway initiates a standard DHCP procedure to configure its network parameters.After changing the network parameters, the gateway attempts to load the cmp and variousconfiguration files from the TFTP servers IP address, received from the BootP/DHCPservers. If a TFTP servers IP address is not received, the gateway attempts to load thesoftware (cmp) file and / or configuration files from a preconfigured TFTP server (seeAutomatic Update Mechanism). Thus, the gateway can obtain its network parameters fromBootP or DHCP servers and its software and configuration files from a different TFTP server(preconfigured in ini file).If BootP/DHCP servers are not found or when the gateway is reset from the Web / SNMP, itretains its network parameters and attempts to load the software (cmp) file and / orconfiguration files from a preconfigured TFTP server.If a preconfigured TFTP server does not exist, the gateway operates using the existingsoftware and configuration files loaded on its non-volatile memory.Note that after the operational software runs, if DHCP is configured, the gateway attempts torenew its lease with the DHCP server.• Though DHCP and BootP servers are very similar in operation, the DHCP serverincludes some differences that could prevent its operation with BootP clients.However, many DHCP servers, such as Windows ™ NT DHCP server, arebackward-compatible with BootP protocol and can be used for gatewayconfiguration.• The time duration between BootP/DHCP requests is set to 1 second by default.This can be changed by the BootPDelay ini file parameter. Also, the number ofrequests is 3 by default and can be changed by BootPRetries ini file parameter(both parameters can also be set using the BootP command line switches).
