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Cisco Broadband Cable Command Reference Guide
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Chapter 2 Cisco CMTS Configuration Commands
cable tftp-enforce
cable tftp-enforce
To require that all CMs on a cable interface attempt to download a DOCSIS configuration file using the
Trivial File Transfer Protocol (TFTP) through the cable interface before being allowed to register and
come online, use the
cable tftp-enforce
command in cable interface configuration mode. To disable this
feature, use the
no
form of this command.
cable tftp-enforce
[
mark-only
]
no cable tftp-enforce
[
mark-only
]
Syntax Description
Defaults
TFTP downloads through the Cisco CMTS are not required (
no cable tftp-enforce
).
Command Modes
Interface configuration (cable interface only)
Command History
Usage Guidelines
The
cable tftp-enforce
cable interface configuration command requires all cable modems on a cable
interface to attempt a TFTP request for the DOCSIS configuration file through the cable interface with
the Cisco CMTS router before being allowed to register and come online. This can help prevent the
following situations from occurring:
•
Users who attempt theft-of-service by reconfiguring their local networks to allow the downloading
of an unauthorized DOCSIS configuration file from a local TFTP server. Typically, some users do
this to obtain services that they have not paid for, such as higher guaranteed bandwidths or a higher
priority Quality of Service (QoS) profile.
mark-only
(Optional) Allow CMs to come online without attempting to download
a DOCSIS configuration file through the Cisco CMTS cable interface,
but prints a warning message and marks those CMs with a pound sign
(#) in the
show cable modem
command.
Release
Modification
12.1(11b)EC1
This command was introduced for the Cisco uBR7100 series and
Cisco uBR7200 series universal broadband routers.
12.1(19)EC
CMs that fail the TFTP checked are now marked with a reject(c) error in the
show cable modem
command, instead of the original reject(m) error, so as
to be consistent with the behavior in the Release 12.2 BC train.
12.2(8)BC2 Support
for this command was added to the 12.2 BC release train for the
Cisco uBR7100 series, Cisco uBR7200 series, and Cisco uBR10012
universal broadband routers.
12.2(15)BC1
The command was enhanced on the Cisco uBR10012 router to prevent the
router from rejecting cable modems that did properly download a DOCSIS
configuration file. See the
“Operation on the Cisco uBR10012 Router”
section on page 2-281
.
