Installation guide

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Cisco uBR7100 Series Universal Broadband Router Software Configuration Guide
OL-2238-03
Chapter 3 Configuring the Cisco Cable Interface
Configuring Time-of-Day Service
To disable cable DHCP giaddr functionality (the default) after it has been enabled, enter the no cable
dhcp-giaddr command in cable interface configuration mode.
Verifying DHCP giaddr Activation
To determine if DHCP giaddr is activated, enter the show running-config command and look for the
cable interface configuration information. If DHCP giaddr is activated, a notation appears in this output.
If DHCP giaddr is deactivated, no entry appears in this output.
Configuring Time-of-Day Service
Activating Time-of-Day Service
To activate Time-of-Day (ToD) service for the Cisco uBR7100 series CMTS, use the following
command in global configuration mode.
To disable ToD service (the default) after it has been enabled, enter the no cable time-server command
or the cable time-server disable command in global configuration mode.
Verifying Time-of-Day Service
To determine if ToD service is activated, enter the show running-config command and look for the
global cable configuration information. If ToD service is activated, an entry appears in this output. If
ToD service is deactivated, no entry appears in this output.
Setting Optional IP Parameters
You can set additional IP parameters to enable downstream echoing of upstream data. To configure these
optional IP parameters, perform the following tasks:
• “Activating IP Multicast Echo” section on page 3-39
Command Purpose
CMTS01(config)# cable dhcp-giaddr primary
or
CMTS01(config-if)# cable dhcp-giaddr policy
Enable cable DHCP giaddr functionality so
that primary addresses are assigned to both
cable modems and remote hosts.
Enable cable DHCP giaddr functionality so
that primary addresses are assigned to cable
modems and secondary addresses are
assigned to remote hosts.
Command Purpose
CMTS01(config)# cable time-server enable
Enable Time-of-Day (ToD) service for the
Cisco uBR7100 series CMTS