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Command Reference
26
Release 11.3(4)NA
show controller cable-modem mac
To show detailed MAC layer information for a cable modem, enter the show cable controller
cable-modem number mac Privileged EXEC command.
show controller 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
controller cable-modem number 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
Sample Display 1, Sample Display 2, and Sample Displays 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 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.