Chapter 4 Troubleshooting the System
Polling Cable Modems
Table
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Corr FEC Errors | The number of correctable FEC errors on this upstream port | ||||||||
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Uncorr FEC Errors | The number of uncorrectable FEC errors on this upstream port | ||||||||
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Sample output: |
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noisy1#show | cable hop |
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Upstream | Port | Poll Missed | Min | Missed Hop | Hop | Corr | Uncorr | ||
Port | Status | Rate Poll | Poll | Poll | Thres | Period | FEC | FEC | |
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| (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
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.
The Cisco 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; the no version of this command disables the status polling.
•The show cable modem
command displays the collected information: downstream to noise ratio, upstream power level, micro reflection in dB.
The Cisco 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)
Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide
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