Activating Cable Modem Insertion Interval

Configuring Headend Broadband Access Router Features

Managing Cable Modems on the HFC Network

To activate cable modem upstream address verification, use the following command in cable interface configuration mode:

Command	Purpose

CMTS01(config-if)#cable source-verify [dhcp]	Activates cable modem upstream verification. The dhcp option
	specifies that queries will be sent to verify unknown IP addresses
	in upstream data packets.

To deactivate cable modem upstream address verification (the default), enter the no cable source-verifycommand.

Verifying Cable Modem Upstream Address Verification

To verify whether cable modem upstream verification has been activated or deactivated, enter the more system:running-configcommand and look for a cable source-verify notation in the cable interface configuration information:

CMTS01# more system:running-config

Building configuration...

Current configuration:

interface Cable6/0

ip address 1.1.1.1 255.255.255.0 no keepalive

cable source-verify

cable insertion-interval 2000 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

To troubleshoot the configuration, perform the following tasks:

•Make sure you entered the correct slot and port numbers when you entered cable interface configuration mode.

•If the Cisco uBR7200 series is reloaded, or the ARP table is cleared, all hosts on the network will be forced to release and renew their IP addresses. Some systems may require restarting if the

IP protocol stack is unable to renew using a broadcast IP address.

•Make sure BPI is active.