The main advantage of configuring cable modems this way is that everything can be done from the Cisco's CMTS, and no other servers (like DHCP, TFTP, or ToD) and software (like DOCSIS CPE Configurator Tool) are required to successfully send a Cisco IOS configurations to Cisco cable modems and get them operational with a customized configuration. When we want to send a configuration file to cable modems using the CLI to configure the DOCSIS configuration file, we need to add a DHCP option called DHCP Vendor Specific Information Option, also known as option 43. For this we use an enhanced version of the all-in-one configuration which allows the Cisco CMTS to be configured as DHCP, ToD, and TFTP servers, as well as to configure a DOCSIS configuration file on the CMTS itself. This document explains in detail the second way to download an IOS configuration file to Cisco Cable Modems without the need of using a DOCSIS Configurator tool. The second way in which the same task can be accomplished is by using the Command Line Interface (CLI) in Cisco IOS of the Cable Modem Termination System (CMTS). The document Building DOCSIS 1.0 Configuration Files Using Cisco DOCSIS Configurator ( registered customers only) contains a detailed explanation on how to do this. Please see the Cisco DOCSIS CPE Configurator ( registered customers only). The first one, which is the most common way, is to use a DOCSIS CPE Configurator tool. There are two ways to download a Cisco IOS configuration file to Cisco cable modems. To send a Cisco IOS configuration file it is necessary to embed the file in the Data-over-Cable Service Interface Specifications (DOCSIS) configuration file that the cable modems use in the TFTP portion of their initialization process. In the case of Cisco cable modems, the configuration that is sent typically contains access lists, hostnames, SNMP community strings, passwords, or routing configuration that differs from the default bridging configuration. Cisco IOSĀ® Software configuration files are text files which contain the configuration to be sent to routers.
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