Configuring Headend Broadband Access Router Features
Configuring and Activating Frequency Agility
MC-564
Cisco IOS Multiservice Applications Configuration Guide
Activating Baseline Privacy
After the KEK and TEK values have been set, activate encryption on the HFC network by using the
following commands in cable interface configuration mode:
Verifying Baseline Privacy
To verify whether or not baseline privacy is activated, enter the cable privacy enable or cable privacy
mandatory command. By default, cable privacy is enabled and can only be disabled with the no cable
privacy command.
Troubleshooting Tips
To troubleshoot the configuration, perform the following tasks:
• Make sure you entered a valid value for grace time or life time for KEK and TEK privacy.
• If you entered the cable privacy mandatory command, then cable modems will not operate unless
the cable modem configuration file specifies that privacy is on.
Configuring and Activating Frequency Agility
The Cisco uBR7200 series universal broadband routers divide a cable plant into downstream channels.
Downstream channels contain upstream segments.
Each upstream segment typically serves more than one fiber node. Upstream segments can be defined as
one of the following:
• Sparse segment—Containing one upstream channel per upstream segment.
• Dense segment—Containing multiple upstream channels per upstream segment; frequencies must
be different.
Note A cable modem card supports either sparse or dense segments—not both.
Defining sparse segments allows the cable operator to share upstream bandwidth among fiber nodes with
fewer subscribers. Defining dense segments allows the cable operator to provide larger upstream
bandwidth to fiber nodes with many subscribers. Figure 109 illustrates sparse versus dense segments.
Command Purpose
Step 1
CMTS01(config-if)# cable privacy enable
Activates cable privacy. This is the default.
Step 2
CMTS01(config-if)# cable privacy mandatory
Activates cable privacy and does not allow access for
any unencrypted cable modem connections.
