Cisco Systems uBR7200 Series manual Polling Cable Modems, Debug and Test Commands

Chapter 4 Troubleshooting the System

Polling Cable Modems

Table 4-15 Upstream Port Parameter Descriptions (continued)

Field		Description
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
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.

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 remote-query receive power level, downstream signal

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

4-16 78-5897-01