Cisco UBR904 Troubleshooting Guide - Page 10

Troubleshooting Steps You can display other aspects of the MAC layer by using variations of the show controllers cable-modem 0 mac command: uBR904# show controllers 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 of how to use these keywords, see the show controllers cable-modem mac command reference page. Step 4-Interpret the MAC Log File and Take Action The MAC log file gives 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 broken down into the chronological sequence of events listed below. Sample comments are also included in the log file. • 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 the shut and no shut conditions on a standard Cisco interface. uBR904# show controllers cable-modem 0 mac log 528302.040 CMAC_LOG_LINK_DOWN 528302.042 CMAC_LOG_RESET_FROM_DRIVER 528302.044 CMAC_LOG_STATE_CHANGE 528302.046 CMAC_LOG_DRIVER_INIT_IDB_SHUTDOWN 528302.048 CMAC_LOG_LINK_DOWN 528308.428 CMAC_LOG_DRIVER_INIT_IDB_RESET 528308.432 CMAC_LOG_LINK_DOWN 528308.434 CMAC_LOG_LINK_UP wait_for_link_up_state 0x08098D02 0x08098E5E 10 Cisco IOS Release 12.0(3)T