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Chapter 6
Cable CPE Commands
show controllers cable-modem mac
To display detailed MAC-layer information for the router's cable interface, use the show controllers
cable-modem mac command in privileged EXEC mode.
Cisco uBR904, uBR905, uBR924, uBR925 cable access routers, Cisco CVA122 Cable Voice Adapter
Syntax Description
number
errors
hardware
log
resets
state
Command Modes
Privileged EXEC
Command History
Release
11.3(4)NA
12.0(4)XI1
12.1(3)XL
12.1(5)XU1
12.2(2)XA
12.2(15)CZ
Usage Guidelines
MAC log messages are written to a circular log file even when debugging is not turned on. These
messages include timestamps, events, and information pertinent to these events. Use the show
controllers cable-modem mac log command to view MAC log messages.
If the router interface fails to come up or resets periodically, the MAC log will capture what happened.
For example, if an address is not obtained from the DHCP server, an error is logged, initialization starts
over, and the router scans for a downstream frequency.
The most useful keywords for troubleshooting a router are log, errors, and resets. See the following
examples for typical outputs for these options.
OL-1581-07
show controllers cable-modem number mac {errors | hardware | log | resets | state}
Identifies the cable interface (always 0).
Displays a log of the error events that are reported to SNMP. This keyword enables
you to look at the error events without accessing a MIB.
Displays all MAC hardware registers.
Displays a history of MAC log messages, up to 1023 entries. This is the same output
that is displayed when using the debug cable-modem mac log command.
Extracts all of the reset causes out of the MAC log file and summarizes them in a mini
report.
Displays a summary of the MAC state.
Modification
This command was introduced for the Cisco uBR904 cable access router.
Support was added for the Cisco uBR924 cable access router.
Support was added for the Cisco uBR905 cable access router.
Support was added for the Cisco CVA122 Cable Voice Adapter.
Support was added for the Cisco uBR925 cable access router.
Support for DOCSIS 1.1 and BPI+ operation was added to the state option
for the Cisco uBR905 and Cisco uBR925 cable access routers, and the
Cisco CVA122 Cable Voice Adapter.
show controllers cable-modem mac
Cisco Broadband Cable Command Reference Guide
6-97
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