Specifications

DOCSIS 1.1 for Cisco uBR905 and Cisco uBR925 Cable Access Routers and Cisco CVA122 Cable Voice Adapters
Command Reference
73
Cisco IOS Release 12.2(15)CZ
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
show controllers cable-modem number mac {errors | hardware | log | resets | state}
Syntax Description
Command Modes Privileged EXEC
Command History
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 captures 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.
number Cable interface (always 0).
errors Log of the error events that are reported to SNMP. This keyword enables you to look
at the error events without accessing a MIB.
hardware All MAC hardware registers.
log 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.
resets Summary of the reset causes out of the MAC log file.
state Summary of the MAC state.
Release Modification
11.3(4)NA This command was introduced for the Cisco uBR904 cable access router.
12.0(4)XI1 Support was added for the Cisco uBR924 cable access router.
12.1(3)XL Support was added for the Cisco uBR905 cable access router.
12.1(5)XU1 Support was added for the Cisco CVA122 Cable Voice Adapter.
12.2(2)XA Support was added for the Cisco uBR925 cable access router.
12.2(15)CZ 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.