Cisco Systems UBR904 manual show controller cable-modem mac, errors, hardware, resets, state

Command Reference

show controller cable-modem mac

To show detailed MAC layer information for a cable modem, enter the show cable controller cable-modemnumber mac Privileged EXEC command.

show controller cable-modem number mac [errors hardware log resets state]

Syntax Description

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.

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-modemnumber 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.

26Release 11.3(4)NA