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show cable modem
You can also specify the MAC address or IP address for a CPE device, and the Cisco CMTS will display
Tip
the information for the CM that is associated with that CPE device in its internal database.
Operation with Hot Standby Connection-to-Connection Protocol (HCCP) Configuration
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 command might not show a particular cable
modem until the CMTS receives IP traffic from that cable modem. You can force IP traffic by using the
ping ip-address command, and then the show cable modem ip-address command will show the cable
modem. You can also display any particular cable modem by using the show cable modem | include ip-
address command.
In addition, when HCCP redundancy has been configured, the Cisco IOS software automatically
synchronizes the secondary, backup cards whenever the configuration is changed. The cards can also be
synchronized manually, using the
CLI commands might be very slow to respond. In particular, if you enter the show cable modem
command at the same time a SYNC event is occurring, the command might respond produce a blank
display, or it might display an error message similar to the following:
%No response from slot 6/1. Command aborted
If this occurs, wait a minute or so and retry the command.
Operation of the show cable modem Commands with Different Cable Interface Line Cards
The show cable modem commands display the most current information for standard cable interface
line cards, such as the Cisco uBR-MC16C, Cisco uBR-MC16S, and Cisco uBR-MC28C cards. If the
card itself is down, the show cable modem commands still show whatever information is appropriate
(such as offline cable modems and flap list information).
The show cable modem commands function slightly differently when used on routers that are using
Broadband Processing Engine (BPE) cable interface line cards (such as the Cisco uBR-MC16U/X,
Cisco uBR-MC28U/X, or Cisco uBR-MC5X20S/U). When BPE cards are the only cable interface cards
installed, the show cable modem commands do not display any output until at least one BPE card is up
and communicating with the router processor. If the BPE cards are not yet up, the show cable modem
command does not display any output.
Additional show cable modem Commands
Other forms of the show cable modem command display additional information about CMs and their
current status. See the following commands for more details:
show cable modem
•
show cable modem
•
show cable modem
•
cable interface line cards with hardware spectrum-management capabilities.
show cable modem connectivity
•
show cable modem
•
show cable modem
•
show cable modem
•
•
show cable modem
Cisco Broadband Cable Command Reference Guide
3-54
hccp resync
command. When a SYNC event command is occurring,
access-group—Displays information about the access group for each CM.
classifiers—Displays information about the classifiers being used for each CM.
cnr—Displays carrier-to-noise ratio (CNR) information for CMs that are using
—Displays connectivity information for each CM.
counters—Displays traffic counters for each CM.
cpe—Displays information about the CPE devices using each CM.
errors—Displays packet error information for each CM.
flap—Displays flap-list information for each CM.
Chapter 3
Cisco CMTS Show Commands
OL-1581-08
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