Chapter 4 Troubleshooting the System
Troubleshooting Using Cable Flap Lists
Customize Other Flap List Values and Related Commands
The following displays flap list with different sorting options:
show cable modem
The following sets the threshold value for link establishment:
[no] cable flap-list insertion-time <sec>
Note A modem is tagged as flapping if the insertion time exceeds this value. Its value can be set from 60 to 86400 seconds with a default of 180 seconds.
The following sets the number of consecutive missed station
[no] cable flap-list miss-threshold <miss-threshold>
The following clears the counters for a cable modem (or all cable modems) in the station maintenance list:
clear cable modem {
The following displays the QoS, modem status, In and Out octets, IP and MAC addresses per SID:
show int cable slot/port sid
The following drops the modem's RF link by removing a modem from the
clear cable-modem { <mac-addr> <ip-addr> all } reset
The following uses a MAC layer ping to determine if the cable modem is online. It uses smaller data units on the wire than a standard IP ping, resulting in lower overhead. Works even if the IP layer in the modem is down or hasn’t completed registration:
ping DOCSIS cable-modem <mac-addr IP address >
The following displays the timing offset, receive power, and QoS values by cable interface, SID, and MAC address:
show cable modem
The following displays the current allocation table and frequency assignments:
show cable spectrum-group [spectrum group number]
The following displays maximum, average, and minimum% online time and offline times for a given SID on a given Cisco uBR7200 interface:
show int slot/port sid connectivity
The following displays input and output rates, input errors, CRC, frames, overruns, underruns, collisions, interface resets. High input errors in the CMTS retrieved from this query suggests noisy upstream. In older versions of the chassis, loose midplane and line card screws caused a similar problem:
show interface slot/downstream-port
Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide
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