Cisco UBR924 - uBR 924 Router Troubleshooting Tips page 11

Step 3—Display the Cisco uBR924's MAC Log File
A MAC-layer circular log file is stored inside the Cisco uBR924. This file contains a history of the
log messages such as state event activities and timestamps. This is the most valuable information for
troubleshooting the cable interface.
The MAC log file is displayed by entering the show controllers cable-modem 0 mac log command
from privileged EXEC mode.
The most useful display fields in this log file are the reported state changes. These fields are preceded
by the message
through the various processes involved in establishing communication and registration with the
CMTS. The
the normal state when the interface is shut down.
Note
display the Cisco uBR924's log file within 5 minutes after the reset or problem occurs.
The following is the normal progression of states as displayed by the MAC log:
Note
Log File and Take Action" on page 13.
Following is an example of what the MAC log file looks like when the Cisco uBR924 interface
successfully comes up and registers with the CMTS. The output you see is directly related to the
messages that are exchanged between the Cisco uBR924 and the headend CMTS.
CMAC_LOG_STATE_CHANGE
maintenance_state
Because the MAC log file only holds a snapshot of 1023 entries at a time, you should try to
wait_for_link_up_state
ds_channel_scanning_state
wait_ucd_state
wait_map_state
ranging_1_state
ranging_2_state
dhcp_state
establish_tod_state
security_association_state
configuration_file_state
registration_state
establish_privacy_state
maintenance_state
To translate this output into more meaningful information, see "Step 4—Interpret the MAC
uBR924# show controllers cable-modem 0 mac log
508144.340 CMAC_LOG_DRIVER_INIT_IDB_RESET
508144.342 CMAC_LOG_LINK_DOWN
508144.344 CMAC_LOG_LINK_UP
508144.348 CMAC_LOG_STATE_CHANGE
508144.350 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND
508144.354 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND
508144.356 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND
508144.360 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND
508144.362 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND
508144.366 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND
508144.370 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND
508144.372 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND
508144.376 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND
508144.380 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND
508144.382 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND
508144.386 CMAC_LOG_WILL_SEARCH_DS_FREQUENCY_BAND
Step 3—Display the Cisco uBR924's MAC Log File
. These fields show how the Cisco uBR924 progresses
is the normal operational state; the
Troubleshooting Tips for the Cisco uBR924 Cable Access Router 11
wait_for_link_up_state
0x08098FEA
ds_channel_scanning_state
88/453000000/855000000/6000000
89/93000000/105000000/6000000
90/111250000/117250000/6000000
91/231012500/327012500/6000000
92/333015000/333015000/6000000
93/339012500/399012500/6000000
94/405000000/447000000/6000000
95/123015000/129015000/6000000
96/135012500/135012500/6000000
97/141000000/171000000/6000000
98/219000000/225000000/6000000
99/177000000/213000000/6000000
is