show controllers cable-modem mac
Troubleshooting Tips for the Cisco uBR904 Cable Modem 31
show controllers cable-modem mac
To show detailed MAC-layer information for a cable modem, enter the show controllers
cable-modem mac command in privileged EXEC mode.
show controllers cable-modem number mac [errors | hardware | log | resets | state]
Syntax Description
Command Mode
Privileged EXEC
Usage Guidelines
This command first appeared in Cisco IOS Release 11.3 NA.
MAC log messages are written to a circular log file even when debugging is not turned on. These
messages include timestamps, events, and information pertinent to these events. Enter the show
controllers cable-modem mac log command to view MAC log messages.
If the cable modem interface fails to come up or resets periodically, the MAC log will capture what
happened. For example, if an address is not obtained from the DHCP server, an error is logged,
initialization starts over, and the cable modem scans for a downstream frequency.
The most useful keywords for troubleshooting a cable modem are log, errors, and resets. See
Example 1, Example 2, and Example 3.
number
The controller number inside the cable modem.
errors
(Optional) Displays a log of the error events that are reported to SNMP. This keyword
gives you a way of looking at the error events without using a MIB.
hardware
(Optional) Displays all MAC hardware registers.
log
(Optional) Displays a history of MAC log messages, up to 1023 entries. This is the same
output that is displayed when the debug cable-modem mac log command is entered.
resets
(Optional) Extracts all the reset causes out of the MAC log file and summarizes them
into a mini report.
state
(Optional) Displays a summary of the MAC state.