show controllers cable-modem mac
90 Cisco IOS Release 12.0(7)T
00:14:32: 872.856 CMAC_LOG_RANGING_SUCCESS
00:14:32: 872.874 CMAC_LOG_STATE_CHANGE dhcp_state
00:14:33: 873.386 CMAC_LOG_DHCP_ASSIGNED_IP_ADDRESS 188.188.1.62
00:14:33: 873.388 CMAC_LOG_DHCP_TFTP_SERVER_ADDRESS 4.0.0.32
00:14:33: 873.392 CMAC_LOG_DHCP_TOD_SERVER_ADDRESS 4.0.0.32
00:14:33: 873.396 CMAC_LOG_DHCP_SET_GATEWAY_ADDRESS
00:14:33: 873.398 CMAC_LOG_DHCP_TZ_OFFSET 60
00:14:33: 873.402 CMAC_LOG_DHCP_CONFIG_FILE_NAME platinum.cm
00:14:33: 873.406 CMAC_LOG_DHCP_ERROR_ACQUIRING_SEC_SVR_ADDR
00:14:33: 873.410 CMAC_LOG_DHCP_COMPLETE
00:14:33: 873.536 CMAC_LOG_STATE_CHANGE establish_tod_state
00:14:33: 873.546 CMAC_LOG_TOD_REQUEST_SENT
00:14:33: 873.572 CMAC_LOG_TOD_REPLY_RECEIVED 3140961992
00:14:33: 873.578 CMAC_LOG_TOD_COMPLETE
00:14:33: 873.582 CMAC_LOG_STATE_CHANGE security_association_state
00:14:33: 873.584 CMAC_LOG_SECURITY_BYPASSED
00:14:33: 873.588 CMAC_LOG_STATE_CHANGE configuration_file_state
00:14:33: 873.592 CMAC_LOG_LOADING_CONFIG_FILE platinum.cm
00:14:34: %LINEPROTO-5-UPDOWN: Line protocol on Interface cable-modem0, changed state to up
00:14:34: 874.728 CMAC_LOG_CONFIG_FILE_PROCESS_COMPLETE
00:14:34: 874.730 CMAC_LOG_STATE_CHANGE registration_state
00:14:34: 874.734 CMAC_LOG_REG_REQ_MSG_QUEUED
00:14:34: 874.744 CMAC_LOG_REG_REQ_TRANSMITTED
00:14:34: 874.754 CMAC_LOG_REG_RSP_MSG_RCVD
00:14:34: 874.756 CMAC_LOG_COS_ASSIGNED_SID 1/16
00:14:34: 874.760 CMAC_LOG_RNG_REQ_QUEUED 16
00:14:34: 874.768 CMAC_LOG_REGISTRATION_OK
00
:14:34: 874.770 CMAC_LOG_REG_RSP_ACK_MSG_QUEUED 0
00:14:34: 874.774 CMAC_LOG_STATE_CHANGE establish_privacy_state
00:14:34: 874.778 CMAC_LOG_PRIVACY_NOT_CONFIGURED
00:14:34: 874.780 CMAC_LOG_STATE_CHANGE maintenance_state
00:14:34: 874.784 CMAC_LOG_REG_RSP_ACK_MESSAGE_EVENT
00:14:34: 874.788 CMAC_LOG_REG_RSP_ACK_MSG_SENT

If the DHCP server cannot not be reached, the error will look like this in the MAC log:

00:14:32: 872.874 CMAC_LOG_STATE_CHANGE dhcp_state
00:14:33: 873.386 CMAC_LOG_RNG_REQ_TRANSMITTED
00:14:33: 873.388 CMAC_LOG_RNG_RSP_MSG_RCVD
00:14:33: 873.386 CMAC_LOG_RNG_REQ_TRANSMITTED
00:14:33: 873.392 CMAC_LOG_RNG_RSP_MSG_RCVD
00:14:33: 873.396 CMAC_LOG_WATCHDOG_TIMER
00:14:33: 873.398 CMAC_LOG_RESET_DHCP_WATCHDOG_EXPIRED
00:14:33: 873.402 CMAC_LOG_STATE_CHANGE reset_interface_state
00:14:33: 873.406 CMAC_LOG_DHCP_PROCESS_KILLED

The fields in this display are explained in the section “Basic Troubleshooting” on page23.

Example 2

MAC error log information is displayed in the following example, which is also reported via SNMP:

uBR924# show controllers cable-modem 0 mac errors
74373.574 R02.0 No Ranging Response received. T3 time-out.
74374.660 R02.0 No Ranging Response received. T3 time-out.
74375.508 R02.0 No Ranging Response received. T3 time-out.
74375.748 R02.0 No Ranging Response received. T3 time-out.
74375.748 R03.0 Ranging Request Retries exhausted.
74376.112 R02.0 No Ranging Response received. T3 time-out.
74376.354 R02.0 No Ranging Response received. T3 time-out.
74376.778 R02.0 No Ranging Response received. T3 time-out.
74377.442 R02.0 No Ranging Response received. T3 time-out.