Cisco Systems UBR904 manual Sample Displays, The format of the DOCSIS configuration file acquired

show controller cable-modem mac

Sample Displays 3

The show controller cable-modem 0 mac resets command shows only the entries in the cable MAC log that begin with the field CMAC_LOG_RESET. Collectively presenting these fields provides you with a summary of the most recent reasons why the cable interface was reset.

Reset messages and brief explainations are included in the following examples and in Table 1. However, the reset messages in Table 2 do not commonly occur.

In the following example, the configuration file downloaded from the TFTP server could not be read. The file might not exist, or the file has incorrect permissions.

uBR904# show controller cable-modem 0 mac resets

62526.114	CMAC_LOG_RESET_CONFIG_FILE_READ_FAILED
62564.368	CMAC_LOG_RESET_T4_EXPIRED
62677.178	CMAC_LOG_RESET_CONFIG_FILE_READ_FAILED
62717.462	CMAC_LOG_RESET_CONFIG_FILE_READ_FAILED
62757.746	CMAC_LOG_RESET_CONFIG_FILE_READ_FAILED
62796.000	CMAC_LOG_RESET_T4_EXPIRED
62908.808	CMAC_LOG_RESET_CONFIG_FILE_READ_FAILED
62949.092	CMAC_LOG_RESET_CONFIG_FILE_READ_FAILED
62989.380	CMAC_LOG_RESET_CONFIG_FILE_READ_FAILED
63029.662	CMAC_LOG_RESET_CONFIG_FILE_READ_FAILED
63069.944	CMAC_LOG_RESET_CONFIG_FILE_READ_FAILED
63110.228	CMAC_LOG_RESET_CONFIG_FILE_READ_FAILED
63148.484	CMAC_LOG_RESET_T4_EXPIRED
63261.296	CMAC_LOG_RESET_CONFIG_FILE_READ_FAILED

The following example shows that the DHCP server could not be reached. The DHCP server took too long to respond.

uBR904# show controller cable-modem 0 mac resets

497989.804 CMAC_LOG_RESET_DHCP_WATCHDOG_EXPIRED 498024.046 CMAC_LOG_RESET_DHCP_WATCHDOG_EXPIRED 498058.284 CMAC_LOG_RESET_DHCP_WATCHDOG_EXPIRED

This next example indicates that an event in the cable interface driver caused the interface to reset. This is often because a shut or clear command is currently being issued on the interface.

uBR904# show controller cable-modem 0 mac resets 527986.444 CMAC_LOG_RESET_FROM_DRIVER 528302.042 CMAC_LOG_RESET_FROM_DRIVER 528346.600 CMAC_LOG_RESET_FROM_DRIVER 528444.494 CMAC_LOG_RESET_FROM_DRIVER

Table 2	Possible but Uncommon Cable Interface Reset Causes
Message		Description
CMAC_LOG_RESET_CONFIG_FILE_PARSE_FAILED		The format of the DOCSIS configuration file acquired
		from the TFTP server is not acceptable.
CMAC_LOG_RESET_LOSS_OF_SYNC		Synchronization with the CMTS has been lost (SYNC
		messages are not being received).
CMAC_LOG_RESET_T4_EXPIRED		Maintenance ranging opportunities for this modem are
		not being received from the CMTS.
CMAC_LOG_RESET_DHCP_WATCHDOG_EXPIRED		The DHCP server took too long to respond.
CMAC_LOG_RESET_TOD_WATCHDOG_EXPIRED		The Time Of Day server took too long to respond.

Troubleshooting Tips for the Cisco uBR904 Cable Modem 29