Cisco Systems UBR904 manual Interpret the MAC Log File and Take Action

Troubleshooting Tips

You can display other aspects of the MAC layer by using variations of the show controller cable-modem 0 mac command:

uBR904# show controller cable-modem 0 mac ?

errors	Mac Error		Log data
hardware	All	CM Mac Hardware registers
log	Mac	log data
resets	Resets of		the MAC
state	Current MAC state

For examples and descriptions on how to use these keywords, see the show controller cable-modem mac command reference page.

Interpret the MAC Log File and Take Action

The MAC log file explains a detailed history of initialization events that occurred in the cable modem. All pertinent troubleshooting information is stored here.

The following sample log file is organized by chronological sequence event. Sample comments are also included.

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Event 1—Wait for the Link to Come Up

Event 2—Scan for a Downstream Channel then Synchronize

Event 3—Obtain Upstream Parameters

Event 4—Start Ranging for Power Adjustments

Event 5—Establish IP Connectivity

Event 6—Establish the Time of Day

Event 7—Establish Security

Event 8—Transfer Operational Parameters

Event 9—Perform Registration

Event 10—Comply with Baseline Privacy

Event 11—Enter the Maintenance State

Event 1—Wait for the Link to Come Up

The MAC layer informs the cable modem’s drivers that it needs to reset. This is the first event that happens after the modem powers up and begins initialization. The fields LINK_DOWN and LINK_UP are similar to a shut and no shut on a standard Cisco interface.

uBR904# show controller cable-modem 0 mac log

528302.040	CMAC_LOG_LINK_DOWN
528302.042	CMAC_LOG_RESET_FROM_DRIVER
528302.044	CMAC_LOG_STATE_CHANGE	wait_for_link_up_state
528302.046	CMAC_LOG_DRIVER_INIT_IDB_SHUTDOWN	0x08098D02
528302.048	CMAC_LOG_LINK_DOWN
528308.428	CMAC_LOG_DRIVER_INIT_IDB_RESET	0x08098E5E
528308.432	CMAC_LOG_LINK_DOWN
528308.434	CMAC_LOG_LINK_UP

10Release 11.3(4)NA