Cisco UBR904 - Router - EN Troubleshooting Tips page 57

Figure 9 compares the output of the debug cable-modem mac log command with the debug
cable-modem mac log verbose command. The verbose keyword displays periodic events such as
ranging.
Figure 9 Sample Debug Cable-Modem Mac Log and Verbose Output
uBR904# debug cable mac log
Cable Modem mac log debugging is on
uBR904#
uBR904#
uBR904# debug cable mac log verbose
Cable Modem mac log debugging is on (verbose)
uBR904#
574623.810 CMAC_LOG_RNG_REQ_TRANSMITTED
574623.812 CMAC_LOG_RNG_RSP_MSG_RCVD
574627.942 CMAC_LOG_WATCHDOG_TIMER
574633.880 CMAC_LOG_RNG_REQ_TRANSMITTED
574633.884 CMAC_LOG_RNG_RSP_MSG_RCVD
574643.950 CMAC_LOG_RNG_REQ_TRANSMITTED
574643.954 CMAC_LOG_RNG_RSP_MSG_RCVD
574654.022 CMAC_LOG_RNG_REQ_TRANSMITTED
574654.024 CMAC_LOG_RNG_RSP_MSG_RCVD
574657.978 CMAC_LOG_WATCHDOG_TIMER
574664.094 CMAC_LOG_RNG_REQ_TRANSMITTED
574664.096 CMAC_LOG_RNG_RSP_MSG_RCVD
574674.164 CMAC_LOG_RNG_REQ_TRANSMITTED
574674.166 CMAC_LOG_RNG_RSP_MSG_RCVD
uBR904# no debug cable mac log verbose
Cable Modem mac log debugging is off
uBR904#
574684.234 CMAC_LOG_RNG_REQ_TRANSMITTED
574684.238 CMAC_LOG_RNG_RSP_MSG_RCVD
Figure 10 shows display output for the debug cable mac messages command. This command causes
received cable MAC management messages to be displayed in a verbose format. The messages that
are displayed are UCD, MAP, RNG-RSP, REG-RSP and UCC. In addition, transmitted REG-REQs
are displayed in hex dump format. The output from this command is very verbose and is usually not
needed for normal interface debugging. The command is most useful when attempting to attach a
cable modem to an uncertified CMTS. For a description of the displayed fields of each message,
refer to the MCNS DOCSIS RFI spec, v1.0.
Figure 10 Sample Debug Cable-Modem Mac Messages Output
uBR904# debug cable mac messages
*Mar 7 01:44:06:
*Mar 7 01:44:06: UCD MESSAGE
*Mar 7 01:44:06: -----------
*Mar 7 01:44:06:
*Mar 7 01:44:06:
*Mar 7 01:44:06:
*Mar 7 01:44:06:
*Mar 7 01:44:06:
*Mar 7 01:44:06:
*Mar 7 01:44:06:
*Mar 7 01:44:06:
*Mar 7 01:44:06:
*Mar 7 01:44:06:
FRAME HEADER
FC
MAC_PARM
LEN
MAC MANAGEMENT MESSAGE HEADER
DA
SA
msg LEN
DSAP
SSAP
Troubleshooting Tips for the Cisco uBR904 Cable Modem 57
debug cable-modem mac
- 0xC2 == MAC Management
- 0x00
- 0xD3
- 01E0.2F00.0001
- 00E0.1EA5.BB60
- C1
- 0
- 0