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Cisco Broadband Cable Command Reference Guide
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Chapter 3 Cisco CMTS Show Commands
show cable modem errors
Note
Also see the information about this command’s behavior in a Hot Standby Connection-to-Connection
Protocol (HCCP) configuration, see the
“Operation with Hot Standby Connection-to-Connection
Protocol (HCCP) Configuration” section on page 3-54
.
Examples
The following example shows sample output for the
show cable modem errors
command for all CMs
on a particular cable interface.
Router#
show cable modem c8/1/0 errors
MAC Address I/F CRC HCS
0050.7366.1243 C8/1/0/U1 0 1
0002.b970.0027 C8/1/0/U4 0 0
0006.5314.858d C8/1/0/U4 8 3
Router#
Table 3-21
describes the fields shown in the
show cable modem errors
displays:
Tip
In Cisco IOS Release 12.1(12)EC, Release 12.2(8)BC1, and later releases, you can add a timestamp to
show
commands using the
exec prompt timestamp
command in line configuration mode.
Related Commands
Table 3-21 Descriptions for the show cable modem errors Fields
Field
Description
MAC Address
The MAC address for the CM.
I/F
The cable interface line card, including the upstream, for this CM.
CRC
Number of times the CMTS upstream receiver flagged a packet with a cyclic
redundancy check (CRC) error from this CM. CRC errors usually indicate
downstream signal interruption or interference noise on a plant. Occasional
CRC errors can always be expected, but a high number of CRC errors could
indicate plant problems such as intermittent upstream problems, laster
clipping, common-path distortion, or impulsive noise or interference.
HCS
Number of times the CMTS upstream receiver flagged a packet with a header
checksum (HCS) error from this CM. HCS errors could indicate the same sort
of plant problems as CRC errors.
Command
Description
cable modem vendor
Associates the name of a vendor with its Organizational Unique Identifier
(OUI).
show cable modem
Displays information for the registered and unregistered CMs.
show cable modem
cnr
Displays information about the upstream carrier-to-noise ratio (CNR) for a
particular cable modem.
show cable modem
connectivity
Displays connectivity statistics for one or more CMs.