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 |
|
|
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
Verifying Cable Modem Upstream Address Verification
To verify whether cable modem upstream verification has been activated or deactivated, enter the more
CMTS01# more
Building configuration...
Current configuration:
!
interface Cable6/0
ip address 1.1.1.1 255.255.255.0 no keepalive
cable
cable
cable downstream modulation 64qam cable downstream
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
Cisco IOS Multiservice Applications Configuration Guide
