Cisco Systems uBR7200 Series manual Show Cable Modem Maintenance

Chapter 4 Troubleshooting the System

Understanding Show Command Responses

See the following sample output of unregistered modems connected on upstream channel 0 for cable interface 3, port 0:

router#show	cable modem cable 3/0 upstream 0 unregistered
Interface	Prim	Online	Timing	Rec	QoS CPE		IP address	MAC address
	Sid	State	Offset	Power
Cable3/0/U0	1	offline	2264	-0.50	2	0	209.165.200.2	0090.8330.0214
Cable3/0/U0	2	offline	4137	!-3.50	2	0	209.165.200.9	0050.7366.17d3
Cable3/0/U0	3	init(d)	4136	!-2.75	2	0	209.165.200.0	0050.7366.17ab
Cable3/0/U0	4	init(d)	4137	!-3.25	2	0	209.165.200.0	0050.7366.1803
Cable3/0/U0	5	init(d)	4141	!-2.75	2	0	209.165.200.0	0050.7366.1801
Cable3/0/U0	6	offline	2251	-0.25	2	0	209.165.200.3	0090.8330.0213
Cable3/0/U0	7	offline	2254	-1.00	2	0	209.165.200.4	0090.8330.020f
Cable3/0/U0	8	offline	2248	0.00	2	0	209.165.200.5	0090.8330.0211
Cable3/0/U0	9	init(rc)	4665	-0.50	2	0	209.165.200.0	00d0.bad3.c459

See the following sample output of offline modems connected on upstream channel 0 for cable interface 3, port 0:

router#show	cable modem cable 3/0 upstream 0 offline
Interface	MAC address	Prim	Previous	Offline		Rx	Rx	SM
		Sid	State	Time		Power	SNR	Exhaust
								Count
Cable3/0/U0	0050.7366.17d3	2	init(o)	Jan 16 20:30:26 !-3.50			-----	1
Cable3/0/U0	0090.8330.0213	6	init(o)	Jan 16	20:30:55	-0.25	-----	181
Cable3/0/U0	0090.8330.020f	7	init(o)	Jan 16	20:31:07	-1.00	-----	181
Cable3/0/U0	0090.8330.0211	8	init(o)	Jan 16	20:31:23	0.00	-----	181

Show Cable Modem Maintenance

When a cable modem is detected to be offline by the CMTS—no reply after 16 retries of station maintenance requests—the cable modem is marked offline. Besides marking the cable modem and SID state offline, the SID is removed immediately from the CMTS ranging list and an aging timer is started to cleanup the SID completely if the cable modem does not attempt to come online within the next 24 hours.

Output fields are described below:

•The "SM Exhausted Count" value refers to the number of times a cable modem was dropped because it did not reply to station maintenance requests. A CM is removed from the station maintenance list after 16 times of periodic ranging opportunity without seeing the RNG_REQ from the modem.

•The "SM Aborted Count" value refers to the number of times the CM was dropped because its operational parameters were unacceptable. This includes such reasons as the power level is outside the acceptable range, or the timing offset keeps changing. The respective times in the command output indicate when this happened.

Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide

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