Troubleshooting guide

Troubleshooting the CMTS
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1. To ping a specific CM IP address or hostname to determine if the CM is
online, use the ping command in Privileged EXEC mode, as shown in the
following example:
RDN#ping {<ip-address> | <hostname>}
where:
ip-address is the IP address of the CM
hostname is the DNS hostname of the CM
2. If there is no IP level conectivity, but you suspect the CM has connectivity at
the MAC layer, use the ping docsis command in to ping a specific CM at the
MAC layer:
RDN(config-if)#ping docsis [<mac-address> | <ip-address>]
3. Determine if the CM is having registration problems by using the debug cable
reg command in Interface Configuration mode, as shown in the following
example:
RDN#debug cable reg
4. To reset a specific CM by using its MAC address, use the clear cable modem
reset command in Privileged EXEC mode, as shown in the following
example:
RDN#clear cable modem [<MAC-address> | <ip-address>] reset
where:
Note: You must use a IP address for the CM you are pinging. If you
cannot ping the CM using its IP address, the CM is not registering.
Note: Be sure to use the correct MAC or IP address of the CM.