
show controllers cable-modem mac
This output indicates that the Cisco uBR900 series acquired a downstream lock, successfully read a UCD, and successfully read a MAP. However, it was unable to communicate with the CMTS after ranging through all upstream transmit power levels. The Cisco uBR900 series tried to communicate with the CMTS 16 times without success, after which it reset the cable interface to try to find a better downstream frequency.
If the DHCP server could not be reached, the error would look like this in the MAC error display:
uBR924# show controllers
No available DHCP Server. No available DHCP Server. No available DHCP Server.
Example 3
The show controllers
Reset messages and brief explanations are included in the following examples and in Table 10; however, the reset messages in Table 10 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 might have incorrect permissions.
uBR924# show controllers 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, or that it took too long to respond.
uBR924# show controllers
497989.804 CMAC_LOG_RESET_DHCP_WATCHDOG_EXPIRED 498024.046 CMAC_LOG_RESET_DHCP_WATCHDOG_EXPIRED 498058.284 CMAC_LOG_RESET_DHCP_WATCHDOG_EXPIRED
Configuring the Cisco uBR900 Series Cable Access Routers 91