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

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Cisco Systems UBR904 manual Sample Displays, Possible but Uncommon Cable Interface Reset Causes, Message Description

UBR904 specifications

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