4-23
Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide
78-5897-01
Chapter4 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 16retries of station
maintenancerequests—the cable modem is marked offline. Besides marking the cable modem and SID
stateoffline, 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
maintenancelist 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
operationalparameters 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.