Table of Contents
Advertisement
option
The Institute of Electrical and Electronics Engineers (IEEE) is the official issuer of OUI values. The
Tip
IEEE OUI web site is at http://standards.ieee.org/regauth/oui/index.shtml.
Example of Constructing an Option 43 Command
For example, to create a vendor-specific option that downloads a Cisco IOS configuration file, you would
create a hexadecimal data string that first contains suboption 8, to specify the vendor ID in TLV format.
You would then add the hexadecimal string that contains suboption 128, to specify the filename for the
configuration file to be downloaded, in TLV format.
The TLV for the Cisco vendor ID would be 08:03:00:00:0C, where 08 is the suboption type, 03 is the
length, and 00:00:0C is the Cisco OUI vendor ID. If the Cisco IOS filename is ios.cfg, the second TLV
would be 80:07:69:6F:73:2E:63:66:67, where 80 is the suboption type (128 decimal), 07 is the length
of the data, and the data is the filename expressed in hexadecimal ASCII values.
The complete hex data string would be 08:03:00:00:0C:80:07:69:6F:73:2E:63:66:67. The complete
command would be option 43 hex 08:03:00:00:0C:80:07:69:6F:73:2E:63:66:67.
When using the option 43 command, you must manually calculate the length value for each TLV that
Note
you specify in the hex data string. However, you do not have to calculate the length for entire option 43
command, because that is calculated automatically by the CMTS.
Caution
Be certain that you have correctly entered the TLV data when using the hex option. Incorrectly entered
data could cause CMs to reset, go offline, or hang, requiring a power cycle before being able to continue.
Use the instance keyword to construct a DOCSIS configuration file that contains multiple option 43
Tip
commands. The multiple commands can be for the same vendor or for different vendors. Specifying
multiple commands for the same vendor is necessary when the total length of all data is greater than 254
bytes, which is the maximum length of the hex data field.
Examples
The following example shows how to specify a static downstream frequency for a Cisco uBR905,
Cisco uBR924, Cisco uBR925, or Cisco CVA, using the option 43 command to specify Cisco vendor-
specific option 1.
router(config)# cable config-file statfreq.cm
router(config-file)# option 43 hex 08:03:00:00:0C:01:04:05:7F:9F:90
router(config-file)# exit
router(config)#
The hexadecimal data shown in this command consists of the two TLVs shown in
Table 2-20 TLV Values for Sample Option 43 Command
Type
TLV 1—Vendor ID, Suboption 8
08
Cisco Broadband Cable Command Reference Guide
2-450
Length
Value
03
00:00:0C (the ID for Cisco cable equipment)
Chapter 2
Cisco CMTS Configuration Commands
Table
2-20:
OL-1581-08
Advertisement
Table of Contents
