V6100 and V7122 User Guide 237C HAPTER 7: U SING BOOT P / DHCPThe V7122 uses the Bootstrap Protocol (BootP) and the Dynamic Host ConfigurationProtocol (DHCP) to obtain its networking parameters and configuration automatically after itis reset. BootP and DHCP are also used to provide the IP address of a TFTP server on thenetwork, and files (cmp and ini) to be loaded into memory.DHCP is a communication protocol that automatically assigns IP addresses from a centralpoint. BootP is a protocol that enables a device to discover its own IP address. Bothprotocols have been extended to enable the configuration of additional parameters specificto the V7122.A BootP/DHCP request is issued after a power reset (see the flow chart in Figure 95), orafter a device exception.BootP is normally used to initially configure the V7122. Thereafter, BootP is nolonger required as all parameters can be stored in the gateway’s non-volatilememory and used when BootP is inaccessible. BootP can be used again tochange the IP address of the V7122 (for example).BootP/DHCP Server ParametersBootP/DHCP can be used to provision the following parameters (included in theBootP/DHCP reply). Note that only the IP address and subnet mask are mandatory: IP address, subnet mask - These mandatory parameters are sent to the V7122 every timea BootP/DHCP process occurs. Default gateway IP address - An optional parameter that is sent to the V7122 only ifconfigured in the BootP/DHCP server. TFTP server IP address - An optional parameter that contains the address of the TFTPserver from which the firmware (cmp) and ini files are loaded. DNS server IP address (primary and secondary) - Optional parameters that contain the IPaddresses of the primary and secondary DNS servers. These parameters are availableonly in DHCP and from Boot version 1.92. Syslog server IP address - An optional parameter that is sent to the V7122 only ifconfigured. This parameter is available only in DHCP. SIP server IP address – Two optional parameters that are sent to the V7122 only ifconfigured. These parameters are available only in DHCP. Firmware file name – An optional parameter that contains the name of the firmware file tobe loaded to the gateway via TFTP. ini file name - An optional parameter that contains the name of the ini file to be loaded tothe gateway via TFTP.
