Specifications

DOCSIS 1.1 for Cisco uBR905 and Cisco uBR925 Cable Access Routers and Cisco CVA122 Cable Voice Adapters

How to Configure DOCSIS 1.1 Support

Cisco IOS Release 12.2(15)CZ

Step 2 If required, add the optional cosigner’s code verification certificate (C-CVC) to a DOCSIS configuration

file in the Co-Signer’s code verification certificate field (TLV 33). To enter this data directly into the

Configurator tool, click on the Miscellaneous tab and enter this data in the Co-signer CVC table (see

Figure 4 on page 25).

If you are creating an ASCII configuration file and converting it into the binary DOCSIS configuration

file, and if the C-CVC contains more than 254 bytes, you must break it apart into successive TLV 33

fields, and each field except the last must contain exactly 254 bytes. The following shows a typical

example of an C-CVC that is greater than 254 bytes:

33 (Co-signer CVC) = 03 2A E4 35 ... E7 D2 (exactly 254 bytes)

33 (Co-signer CVC) = 12 A4 36 4B ... 11 1F (exactly 254 bytes)

33 (Co-signer CVC) = AB D0 F4 (254 bytes or less)

If you are using Release 3.7 or later of the DOCSIS Configurator tool, you can also specify TLV 330,

which allows you to specify the location of the actual C-CVC binary file on the local disk. The

Configurator then reads the file and saves the CVC as part of the DOCSIS configuration file. This avoids

having to convert the CVC into a hexadecimal format, as shown above.

For example, if you are running the DOCSIS Configurator on a Windows workstation, and you have

saved the C-CVC in the file D:\MSO.cvc, use the following line into the ASCII file:

330 (Co-signer CVC) = D:\MSO.cvc

Note If you use TLV 320 or TLV 330, you must specify the location of the actual CVC file, in its

binary, encoded form. Do not specify a text file with a hexadecimal dump of the CVC.

Step 3 After entering all other required values into the DOCSIS configuration file, reset the Cisco uBR905,

Cisco uBR925, or Cisco CVA122, and download the DOCSIS configuration file to it.

Performing a Secure Software Download

Use the following procedures to download a digitally signed software image to the router using the

secure software download procedure.

• Downloading the Image During Initialization Through the DOCSIS Configuration File, page 28

• Downloading the Image After Initialization Through SNMP, page 30

These procedures assume that the required CVCs have been downloaded to the router (see the

“Configuring for Secure Software Download” section on page 24) and that the router is already running

a DOCSIS 1.1 software image.

Note If the cable modem did not receive a valid CVC in the DOCSIS configuration file, the secure software

download fails with the debug message “Boot file is current.” This indicates that the cable modem is

continuing to use the current software image. Verify that the DOCSIS configuration file contains a valid

CVC for the software image being downloaded.