The Arris cable modems has what they refer to as "smart download" for their firmware updates, where the device will just download the differences between it's current firmware and the required firmware update.
Are some tftp-hpa specific options in it's configuration to support this feature?
Eric Feldhusen
There is a series of Arris-specific SNMP MIBs placed in the cable modem .CM file, that allow multiple devices to be served their specific version of firmware. The actual mechanism is triggered by the MIB:
SnmpMib = arrisCmDevSWAdminStatus.0 allowArrisProvisioningUpgrade
There follows a list of the device names (SwHwModel), the file to hand out, and the TFTP server to seek.
I haven't seen a "partial firmware" option in the process. Arris firmware loads are monolithic in nature, meaning that if the device contains a modem, wireless router and MTA, there will be the one file to serve up. You won't be updating just the MTA's firmware.