User Manual

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3.2.4!IP!ADDRESS!ASSIGNMENT!AND!CONFIGURATION!FILE!RETRIEVAL!
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The system configuration parameters are maintained in the configuration file saved on flash.
The configuration file saved on flash can exist because of any of the following events:
System finds no configuration file on flash and automatically retrieves a configuration file from a
TFTP server. This depends on whether the CPE is offered a configuration file in the DHCP OFFER
message or not.
! In case no configuration file is offered by DHCP or the CPE fails to acquire an IP using
DHCP, the CPE retrieves either the MAC address configuration file or the default
configuration file.
! In case a configuration file is specified in the DHCP, the CPE retrieves either the
configuration file specified in the DHCP offer message or the MAC address configuration
file or the default configuration file.
! User manually downloads a configuration file using the downloadConfigFile command and
reboots.
! User issues a saveSysConfiguration command which saves the current runtime configurations
to flash.
As soon as the CPE connects to the BS and is in the OPERATIONAL state, the CPE will start
acquiring an IP address using DHCP.
If the CPE successfully acquires an IP address using DHCP, and the DHCP server is configured to
offer a configuration file, then the CPE will attempt to retrieve the specified configuration file
whether or not a file exists on flash.
If the system successfully retrieves the DHCP configuration file, it will compare its timestamp with
the timestamp of the configuration file saved on flash, if newer it will overwrite the file on flash, else
it will ignore the retrieved file and continue operation with the one on flash.
If the system fails to acquire an IP using DHCP (four retries performed) then the system will use the
IP address specified in the configuration file as the CPE_WIMAX_IP_ADDR.
If the system fails to retrieve the specified file or the file is corrupted and no file exists on flash, the
CPE will attempt to retrieve a configuration file from TFTP server baed on its MAC address. If it
fails to find the file or the file is corrupted (wrong CRC or mal formatted XML) the CPE will attempt
to retrieve the default configuration file. If it fails to retrieve the default configuration file or the file
is corrupted (wrong CRC or mal formatted XML), the CPE will use the default configurations saved
as macros.
For each TFTP connection, the system will attempt three times with two minutes gap between each
retry.