Installation guide

5-15
Cisco uBR7100 Series Universal Broadband Router Software Configuration Guide
OL-2238-03
Chapter 5 Troubleshooting the System
Polling Cable Modems
Debug and Test Commands
To enable display of frequency hopping debugging messages, enter:
debug cable freqhop
To enable display of spectrum management debugging messages, enter:
debug cable specmgmt
To force a frequency hop decision on the port or ports, enter:
test cable hop cable-if I portnum
Polling Cable Modems
You can obtain operating statistics and determine the state of CMs on the network. The Cisco uBR7100
series CMTS supports polling of CMs to obtain parameter and status information on an ongoing basis.
The following Cisco IOS commands have been added to support the feature:
• cable modem remote configures the router for the polling interval; the no version of this command
disables the status polling.
• show cable modem remote-query displays the collected information: downstream receive power
level, downstream signal to noise ratio, upstream power level, micro reflection in dB.
The Cisco uBR7100 series CMTS polls CMs on the network and caches the state information on the
CMTS, allowing administrators to use SNMP to manage the system.
This section describes how you can enable this. See the following configuration tasks:
• “Enabling SNMP” section on page 5-15 (required)
• “Configuring Remote Modem Monitoring” section on page 5-15 (required)
Enabling SNMP
Configuring Remote Modem Monitoring
Verifying Remote Query Information
To display information from a queried modem, enter the show cable modem remote-query command.
R7732-01-uBR7246# show cable modem remote-query
IP address MAC address S/N US DS Tx Time Micro (dB) Modem
Ratio Power Power Offset Reflection State
5.108.1.2 0010.4bd7.ccf2 0.0 0.0 0.0 0 0 offline
5.109.1.2 0000.0000.0022 0.0 0.0 0.0 0 0 offline
Command Purpose
Router(config)# snmp-server manager
Opens the SNMP manager.
Router(config)# snmp-server community [Community
String]
[Permissions]
Defines user permissions.
Command Purpose
Router(config)# cable modem remote-query
[polling interval] [Community string]
Specifies how often SNMP polls the
modem and allows you to configure access.