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Cisco Broadband Cable Command Reference Guide
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Chapter 3 Cisco CMTS Show Commands
show cable modem cnr
show cable modem cnr
To display information about the upstream carrier-to-noise ratio (CNR) or signal-to-noise ratio (SNR)
for a particular cable modem, use the
show cable modem
command in privileged EXEC mode.
show cable modem
{
ip-address
|
mac-address
}
cnr
Note
This command can be used for cable modems that are using interfaces on a Cisco uBR-MC16S,
Cisco uBR-MC16U/X, Cisco uBR-MC28U/X, and Cisco uBR-MC5X20S/U cable interface line cards
only.
Syntax Description
Command Modes
Privileged EXEC
Command History
Usage Guidelines
This command displays information on the current CNR value for cable modems that are using interfaces
on the Cisco uBR-MC16S, Cisco uBR-MC16U/X, Cisco uBR-MC28U/X, and Cisco uBR-MC5X20S/U
cable interface line cards. For cable modems on all other interfaces, this command displays information
on the modem’s current SNR value.
Tip
If you are using Hot Standby Connection-to-Connection Protocol (HCCP) 1+1 or 1:n (N+1) redundancy,
the new primary processor after a switchover automatically creates a new database of the online cable
modems. This means that the
show cable modem
ip-address
cnr
commands might not show a particular
cable modem until the CMTS receives IP traffic from that cable modem. You can force IP traffic by using
ip-address
Identifies the IP address of a specific CM to be displayed.
mac-address
Identifies the MAC address of a specific CM to be displayed.
Release
Modification
12.1(7)CX1
This command was introduced (in the form of
show cable modem snr
) for
Cisco uBR7200 series routers using the Cisco uBR-MC16S cable interface
line card.
12.2(4)BC2
The command was changed to its current form of
show cable modem cnr
.
12.2(8)BC2
Support was added for the Cisco uBR-LCP2-MC16S cable interface line
card on the Cisco uBR10012 router.
12.2(11)BC3
Support was added for the Cisco uBR-MC5X20S cable interface line cards
on the Cisco uBR10012 router.
12.2(15)BC1
If a cable modem is offline, its CNR value is now shown as “-----”.
12.2(15)CX
Support was added for the Cisco uBR-MC28U/X cable interface line cards
on the Cisco uBR7246VXR router.
12.2(15)BC2
Support was added for the Cisco uBR-MC16U/X and
Cisco uBR-MC5X20U cable interface line cards.