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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.
This command can be used for cable modems that are using interfaces on a Cisco uBR-MC16S,
Note
Cisco uBR-MC16U/X, Cisco uBR-MC28U/X, and Cisco uBR-MC5X20S/U cable interface line cards
only.
Syntax Description
ip-address
mac-address
Command Modes
Privileged EXEC
Command History
Release
12.1(7)CX1
12.2(4)BC2
12.2(8)BC2
12.2(11)BC3
12.2(15)BC1
12.2(15)CX
12.2(15)BC2
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
Cisco Broadband Cable Command Reference Guide
3-70
show cable modem {ip-address | mac-address} cnr
Identifies the IP address of a specific CM to be displayed.
Identifies the MAC address of a specific CM to be displayed.
Modification
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.
The command was changed to its current form of show cable modem cnr.
Support was added for the Cisco uBR-LCP2-MC16S cable interface line
card on the Cisco uBR10012 router.
Support was added for the Cisco uBR-MC5X20S cable interface line cards
on the Cisco uBR10012 router.
If a cable modem is offline, its CNR value is now shown as "-----".
Support was added for the Cisco uBR-MC28U/X cable interface line cards
on the Cisco uBR7246VXR router.
Support was added for the Cisco uBR-MC16U/X and
Cisco uBR-MC5X20U cable interface line cards.
Chapter 3
Cisco CMTS Show Commands
OL-1581-08
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