user manual

Configuring Headend Broadband Access Router Features
Managing Cable Modems on the HFC Network
MC-588
Cisco IOS Multiservice Applications Configuration Guide
To activate cable modem upstream address verification, use the following command in cable interface
configuration mode:
To deactivate cable modem upstream address verification (the default), enter the no cable source-verify
command.
Verifying Cable Modem Upstream Address Verification
To verify whether cable modem upstream verification has been activated or deactivated, enter the more
system:running-config command 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.
Activating Cable Modem Insertion Interval
When a cable modem is ready to join the HFC network and send data, it requests an upstream frequency
from the Cisco uBR7200 series. You can limit the amount of time that a cable modem can request an
upstream frequency from the Cisco uBR7200 series for the first time. The initial request of a cable
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.