Cisco Systems uBR7200 Series Manual De Usuario
4-3
Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide
78-5897-01
Chapter 4
Troubleshooting the System
Managing Cable Modems on the HFC Network
Verify Sync Message Interval
To verify whether or not a sync message interval is configured, enter the show running-config
command and look for the cable interface configuration information. If the sync message interval is
deactivated or reset to its default value, the
command and look for the cable interface configuration information. If the sync message interval is
deactivated or reset to its default value, the
no sync interval
command line appears in the output.
Activate Cable Modem Authentication
The Cisco uBR7200 series can be configured to require all cable modems to return a known text string
to register with the CMTS and gain access to the network. The text string can be from 1 to 80 characters
in length. To activate cable modem authentication, use the following command from cable interface
configuration mode.
to register with the CMTS and gain access to the network. The text string can be from 1 to 80 characters
in length. To activate cable modem authentication, use the following command from cable interface
configuration mode.
Tips
Be sure you enter the correct slot and port number in the cable interface configuration
mode. Verify that the cable modem is using BPI and that it is assigned to a QoS with
privacy active. Verify that the cable modem configuration file contains a matching key.
mode. Verify that the cable modem is using BPI and that it is assigned to a QoS with
privacy active. Verify that the cable modem configuration file contains a matching key.
Verify Cable Modem Authentication
To verify whether cable modem authentication is activated or deactivated, enter the command more
system:running-config and look for the cable interface configuration information. If cable modem
authentication is deactivated, it appears in this output as
system:running-config and look for the cable interface configuration information. If cable modem
authentication is deactivated, it appears in this output as
no cable secret-shared.
Activate Cable Modem Upstream Address Verification
Cable modem upstream address verification ensures that only cable modems that have received DHCP
leases through the Cisco uBR7200 series can access the HFC network. The Cisco uBR7200 series
discards all packets received from or for hosts that have not received DHCP-assigned addresses.
leases through the Cisco uBR7200 series can access the HFC network. The Cisco uBR7200 series
discards all packets received from or for hosts that have not received DHCP-assigned addresses.
Table 4-2
Instructions to Activate Cable Modem Authentication
Command
Purpose
CMTS01(config-if)# cable shared-secret
[0|7]
authorization-key
CMTS01(config-if)# no cable shared-secret
Enable cable modem authentication:
0
specifies an
unencrypted authentication key;
7
specifies an
encrypted authentication key.
Disable cable modem authentication.