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Chapter 2
Cisco CMTS Configuration Commands
Table 2-19
applicable, the table shows the cable config-file command you can use to specify that option.
Table 2-19 Invalid Option Codes for the cable config-file option Command
Option
5, 6, 7, 20
9
12
13
17
18
19
21
Note
For complete information on the other parameters and fields in DOCSIS configuration files, see
Appendix C in the DOCSIS 1.1 Radio Frequency (RF) Interface Specification, available on the DOCSIS
Cable Labs official web site at http://www.cablemodem.com/specifications.html.
Using Option 43 (Vendor-Specific Information Fields)
The most common use of the cable config-file option command is to specify vendor-specific
information field values, which vendors use to implement features that are unique to their products. In
this case, the value for n must be 43.When you use the vendor-specific option (option 43), you must
specify the data using the hex option.
The hexadecimal data must be presented in the DOCSIS Type/Length/Value (TLV) format, where the
first byte specifies the suboption type, the second byte specifies the length of the data, and the remaining
bytes specify the data itself. The exact meaning of the suboption type and data values is defined by each
vendor.
For example, Cisco CMs support a vendor-specific suboption (128) that instructs the CM to download
and execute a Cisco IOS configuration file. The data for this suboption is the fully qualified path name
of the Cisco IOS configuration file on the TFTP server. Other vendors, however, could define vendor-
specific suboption 128 to have a totally different function.
To ensure that a vendor-specific option is executed only by equipment that supports that option, the
vendor ID must always be the first part of the data in an option 43 command. The suboption number for
the vendor ID function is 08, and the data is the three byte Organization Unique Identifier (OUI) for that
vendor, as issued by the Institute of Electrical and Electronics Engineers (IEEE).
The vendor could have defined a global OUI for all of their equipment, or they could have requested a
separate OUI ID for different products or family of products. For example, the global OUI for Cisco
equipment is 00 00 0C.
Each option 43 command must specify one and only one vendor ID, and the vendor ID must be the first
Note
TLV in the hex data string.
OL-1581-08
lists the options that cannot be specified by the cable config-file option command. Where
Description
Internal Configuration File Options
Software Upgrade Filename
Modem IP Address
Service Not Available Response
Baseline Privacy Interface Configuration
Maximum Number of CPE devices
TFTP Server Timestamp
Software Upgrade TFTP Server
Cable Config-File Command
N/A
download
N/A
N/A
privacy
cpe max
timestamp
download
Cisco Broadband Cable Command Reference Guide
option
2-449
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