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Manage Cable Modems on the HFC Network
Configuring Cisco uBR7246 Universal Broadband Router Features VC-157
Validation Tips
To verify if IP broadcast echo has been activated or deactivated, enter the command more
system:running-config and look for the cable interface configuration information as shown in this
command output excerpt:
router# more system:running-config
Building configuration...
Current configuration:
!
interface Cable6/0
ip address 1.1.1.1 255.255.255.0
no keepalive
cable ip-broadcast-echo
cable insertion-interval 150000
cable downstream annex B
cable downstream modulation 64qam
cable downstream interleave-depth 32
cable downstream symbol-rate 5056941
cable upstream 0 frequency 15008000
cable upstream 0 fec
cable upstream 0 scrambler
no cable upstream 0 shutdown
!
Troubleshooting Tips
If you are having trouble, make sure that you entered the correct slot and port numbers when you
entered cable interface configuration mode.
Manage Cable Modems on the HFC Network
After you have completed upstream and downstream signal configuration, there are a number of
different things you can do to manage how your cable modems operate in the HFC network. You can
control access by forcing cable modems to authenticate with the Cisco uBR7246, allow only known
cable modems to send upstream data, move cable modems to different channels, and define a length
of time a cable modem can request a connection.
To manage cable modems, perform the following tasks:
• Activate Cable Modem Authentication
• Activate Cable Modem Upstream Address Verification
• Activate Cable Modem Upstream Address Verification
• Activate Cable Modem Insertion Interval
Note The default values for the commands used in these configuration steps are, in most cases,
adequate to configure the Cisco uBR7246.
Activate Cable Modem Authentication
You can activate authentication so all cable modems must return a known text string to register with
the Cisco uBR7246 for access to the network. The text string can be from 1 to 80 characters in
length. The default is “on” (cable modem authentication is activated).