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ping docsis
ping docsis
To determine whether a specific CM is reachable from the CMTS at the DOCSIS MAC layer, use the
ping docsis command in privileged EXEC mode.
Cisco uBR904, uBR905, uBR924, uBR925 cable access routers, Cisco CVA122 Cable Voice Adapter
Syntax Description
mac-addr
ip-addr
count
verbose
Defaults
If no count is specified, five DOCSIS ping packets are sent.
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
Usage Guidelines
The DOCSIS ping is a unique Cisco technology that allows a cable operator to quickly diagnose the
health of a channel between the CMTS and any particular DOCSIS cable CPE device. The DOCSIS ping
is similar in concept to the IP ping but uses the lower MAC layer instead of the datalink or transport
layers. Using the MAC layer has two major advantages:
•
•
In addition to providing connectivity information, the ping docsis command provides a real-time view
and plot of requested power adjustments, frequency, timing offset adjustments, and a measure of optimal
CMTS reception power.
If a CM responds to the ping docsis command, but does not respond to an IP ping, the problem could be
one of the following:
Cisco Broadband Cable Command Reference Guide
6-62
ping docsis {mac-addr | ip-addr} [count] [verbose]
Specifies the 48-bit hardware (MAC) address of the CM.
Specifies the IP address of the CM.
Specifies the number of ping packets to be sent.
Specifies verbose mode for the output, giving additional details about the packets
transmitted and received.
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.
A DOCSIS ping uses only 1/64 of the bandwidth of an IP ping.
A DOCSIS ping can be used with CMs that have not yet acquired an IP address. This allows cable
operators to "ping" CMs that weren't able to complete registration or that were improperly
configured at the IP layer.
Chapter 6
Cable CPE Commands
OL-1581-07
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