Cisco SR2016T-NA Reference Manual page 294

cable tftp-enforce
In the above situation, cable modems that do not download a DOCSIS configuration file are marked as
Note
"offline" instead of "reject(c)" by the
%UBR10000-4-REGISTRATION_BEFORE_TFTP error message, however, to allow you to identify
these cable modems as TFTP violators.
Examples
The following example shows how to enforce TFTP downloads for all of the cable modems on cable
interface 3/0. These cable modems must attempt a TFTP download of the DOCSIS configuration file
through the cable interface with the Cisco CMTS. If they do not, they are not allowed to register or come
online, and they are marked as having either a registration error—reject(c)—in the
command.
The initial version of this feature marked CMs that failed the TFTP check as having a Message Integrity
Note
Check (MIC) failure—reject(m). The command was changed to show reject(c) in Cisco IOS Release
12.2(8)BC2 and Release 12.1(19)EC.
Router# configure terminal
Router(config)# interface cable 3/0
Router(config-if)# cable tftp-enforce
Router(config-if)# exit
Router(config)#
Router# show cable modems
Interface
Cable3/0/U1 1
Cable3/0/U0 2
Cable3/0/U0 3
Cable3/0/U1 4
Cable3/0/U1 5
Router#
DOCSIS-compliant cable modems that are rejected with a MIC failure go into the offline state for a short
Note
period of time and then retry the registration process.
The
Router# debug cable interface c3/0 verbose
Router# debug cable registration
CMTS registration debugging is on
Jun
Jun
Jun
Jun
Jun
Jun
Jun
Jun
Jun
Jun
Jun
TFTP
22:33:21 %UBR7200-4-REGISTRATION_BEFORE_TFTP: Registration request unexpected:
Cisco Broadband Cable Command Reference Guide
2-282
Prim Online
Sid State
online(pt)
online(pt)
init(i)
online(pt)
reject(m)
debug cable registration
6 23:27:15.859: Registration request from 00ff.ff66.12fb, SID 7 on Cable3/0/U1
6 23:27:15.859: Found a network access control parameter: Ok
6 23:27:15.859: Found a class of service block: Ok
6 23:27:15.859: Found Baseline Privacy config: Ok
6 23:27:15.859: Found Max CPE: Ok
6 23:27:15.859: Found CM MIC: Ok
6 23:27:15.859: Found CMTS MIC: Ok
6 23:27:15.859: Found modem ip: Ok
6 23:27:15.859: Found modem capabilities: Ok
6 23:27:15.859: Finished parsing REG Request
6 23:27:15.859: Cable Modem sent Registration Request without attempting required
show cable modem
Timing Rec QoS CPE IP address
Offset Power
2734 0.50 5 0
2729 0.25 5 0
2732 0.25 2 0
2737 0.75 5 0
2215 0.25 2 0
command can be used to display additional information:
Chapter 2 Cisco CMTS Configuration Commands
command. The console still displays the
show cable modem
MAC address
10.1.1.38 00ff.fffa.0a35
10.1.1.50 00ff.ff07.382f
10.1.1.48 00ff.ff03.307d
10.1.1.34 00ff.ff59.4477
10.1.1.47 00ff.ff66.12fb
OL-1581-08