Cisco Systems UBR904 manual Release 11.34NA, uBR904# debug cable mac log, debug cable mac messages

Debug Commands

Figure 9 compares the output of the debug cable-modem mac log command with the debug cable-modem mac log verbose command. The keyword verbose 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 Privileged EXEC 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:	FRAME HEADER
*Mar	7	01:44:06:	FC	-	0xC2 == MAC Management
*Mar	7	01:44:06:	MAC_PARM	-	0x00
*Mar	7	01:44:06:	LEN	-	0xD3
*Mar	7	01:44:06:	MAC MANAGEMENT MESSAGE HEADER
*Mar	7	01:44:06:	DA	-	01E0.2F00.0001
*Mar	7	01:44:06:	SA	-	00E0.1EA5.BB60
*Mar	7	01:44:06:	msg LEN	-	C1
*Mar	7	01:44:06:	DSAP	-	0
*Mar	7	01:44:06:	SSAP	-	0

50Release 11.3(4)NA