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Cisco Broadband Cable Command Reference Guide
OL-1581-07
Chapter 6 Cable CPE Commands
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
ping docsis
{
mac-addr
|
ip-addr
} [
count
] [
verbose
]
Syntax Description
Defaults
If no count is specified, five DOCSIS ping packets are sent.
Command Modes
Privileged EXEC
Command History
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:
•
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.
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:
mac-addr
Specifies the 48-bit hardware (MAC) address of the CM.
ip-addr
Specifies the IP address of the CM.
count
Specifies the number of ping packets to be sent.
verbose
Specifies verbose mode for the output, giving additional details about the packets
transmitted and received.
Release
Modification
11.3(4)NA
This command was introduced for the Cisco uBR904 cable access router.
12.0(4)XI1
Support was added for the Cisco uBR924 cable access router.
12.1(3)XL
Support was added for the Cisco uBR905 cable access router.
12.1(5)XU1
Support was added for the Cisco CVA122 Cable Voice Adapter.
12.2(2)XA
Support was added for the Cisco uBR925 cable access router.
Содержание Broadband Cable
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Страница 1266: ...A 50 Cisco Broadband Cable Command Reference Guide OL 1581 07 Appendix A Using the ROM Monitor unset ...