Ping Docsis - Cisco SR2016T-NA Reference Manual

Chapter 2 Cisco CMTS Configuration Commands

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.
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 NA
12.1(1a)T1
12.1(3)XQ1
12.1(5)EC
12.2(1)XF1
12.2(4)BC1
Usage Guidelines
The DOCSIS ping is a unique Cisco patented 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
headend reception power.
OL-1581-08
ping docsis {mac-addr | ip-addr} [count] [verbose]
Specifies the 48-bit hardware (MAC) address of the CM. If you specify the MAC
address of a CPE device, the command will resolve it to the MAC address of the
CM servicing that CPE device and send the DOCSIS ping to the CM.
Specifies the IP address of the CM. If you specify the IP address of a CPE device,
the command will resolve it to the IP address of the CM servicing that CPE
device and send the DOCSIS ping to 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 uBR7200 series router.
The command output was enhanced.
Support was added for wireless radio modems.
Support was added for the Cisco uBR7100 series routers.
Support was added for the Cisco uBR10012 router.
Support was added to the Release 12.2 BC train.
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.
Cisco Broadband Cable Command Reference Guide
ping docsis
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