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debug cable-modem mac messages
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
12.3(2)T
Usage Guidelines
The output from this command is very verbose, displaying the details of the DOCSIS MAC-layer
messages, and is usually not needed for normal interface debugging. The command is most useful when
attempting to attach a router to a CMTS that is not DOCSIS-qualified.
This command should be used only while debugging CM operation. Displaying debugging messages
Caution
consumes system resources, and turning on too many messages could negatively affect system
performance.
Examples
The following example shows typical output from the debug cable-modem mac messages command. A
separate command must be given for each message type to be displayed.
Much of the information, such as REG-REQ messages, is displayed in hexadecimal dump format, using
the Type/Length/Value (TLV) format required by the DOCSIS specification.
For complete descriptions of the MAC-layer management messages, see the DOCSIS Radio Frequency
Note
Interface Specification (SP-RFIv1.1-I07-010829 or later), available from CableLabs at
http://www.cablemodem.com/specifications.html.
Router# debug cable mac messages ucd
ucd message debugging is on
Router# debug cable mac messages map
map message debugging is on
Router# debug cable mac messages rng-rsp
rng-rsp message debugging is on
Router#
*Mar
*Mar
*Mar
*Mar
*Mar
*Mar
*Mar
*Mar
*Mar
*Mar
Cisco Broadband Cable Command Reference Guide
6-196
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.
The dcc-ack, dcc-req, and dcc-rsp options were added to support
DOCSIS 1.1 operations.
The up-dis option was supported.
7 01:44:06:
7 01:44:06: UCD MESSAGE
7 01:44:06: -----------
7 01:44:06:
FRAME HEADER
7 01:44:06:
FC
7 01:44:06:
MAC_PARM
7 01:44:06:
LEN
7 01:44:06:
MAC MANAGEMENT MESSAGE HEADER
7 01:44:06:
DA
7 01:44:06:
SA
Chapter 6
- 0xC2 == MAC Management
- 0x00
- 0xD3
- 01E0.2F00.0001
- 00E0.1EA5.BB60
Cable CPE Commands
OL-1581-07
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