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Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide
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Chapter4 Troubleshooting the System
Polling Cable Modems
Sample output:
noisy1#show cable hop
Upstream Port Poll Missed Min Missed Hop Hop Corr Uncorr
Port Status Rate Poll Poll Poll Thres Period FEC FEC
(ms) Count Sample Pcnt Pcnt (sec) Errors Errors
Cable3/0/U0 down 1000 * * * frequency not set * * * 0 0
Cable3/0/U1 admindown 1000 * * * interface is down * * * 0 0
Cable3/0/U2 admindown 1000 * * * interface is down * * * 0 0
Cable3/0/U3 admindown 1000 * * * interface is down * * * 0 0
Cable3/0/U4 admindown 1000 * * * interface is down * * * 0 0
Cable3/0/U5 admindown 1000 * * * interface is down * * * 0 0
Cable4/0/U0 10.800 Mhz 1000 0 0 ----- 100% 300 0 0
Cable6/0/U0 down 1000 * * * frequency not set * * * 0 0

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
Cisco IOS Release 12.0(7)XR2, Cisco IOS Release 12.1(1a)T1 or higher CMTS images, contain
modem status enhancements. You can obtain operating statistics and determine the state of cable
modems on the network.
TheCisco uBR7200 series supports polling of cable modems to obtain parameter and status information
on an ongoing basis. Two new Cisco IOS commands are added to support the feature:
•The cable modem remote command configures the router for the polling interval; theno version
of this command disables the status polling.
•Theshow cable modem remote-query command displays the collected information: downstream
receivepower level, downstream signal to noise ratio, upstream power level,micro reflection in dB.
TheCisco uBR7200 series polls cable modems 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:
•Enable SNMP (required)
•Configure Remote Modem Monitoring (required)
Corr FEC Errors The number of correctable FEC errors on this upstream port
Uncorr FEC Errors The number of uncorrectable FEC errors on this upstream port
Table4-15 Upstream Port Parameter Descriptions (continued)
Field Description