Cisco SR2016T-NA Reference Manual page 401

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Cisco CMTS Configuration Commands

Usage Guidelines

This command instructs the Cisco CMTS to stop sending DOCSIS station maintenance messages to one

or more CMs, which effectively terminates the link to those CMs. A CM responds to this by resetting

itself. Depending on when the CM received the last station maintenance message, it can take up to 30

seconds before the CM detects the missing station maintenance messages and resets itself.

In some circumstances, the customer premises equipment (CPE) devices behind a CM stops receiving

traffic after the CM is reset. This is because the CMTS still has the CPE device listed in its address tables,

but the CM does not after being reset, so the traffic passes through the CMTS but is dropped by the CM.

To resolve this situation, the CPE device should simply send some type of traffic to the CM, such as a

ping packet. (You can also resolve this situation by using the clear arp-cache command on the

Cisco CMTS router to clear the router's address table, but this is not recommended, because it

temporarily interrupts all traffic on the router.)

The clear cable modem all reset command can result in the CPU utilization temporarily reaching

100 percent for a couple of minutes, as the CPU processes the command for all CMs. The CPU

utilization will return to normal within a couple of minutes.

The clear cable modem all reset command should normally be used only on a test or lab network. If

used on a large network, it could impact service for a significant period of time, as it would force all

CMs to simultaneously reset and reregister with the Cisco CMTS.

You can also specify the MAC address or IP address for a CPE device or host, and the Cisco CMTS resets

the CM that is associated with that CPE device in its internal database.

The following example shows how to reset the CM at 172.23.45.67:

Router# clear cable modem 172.23.45.67 reset

The following example shows how to reset all CMs that have a OUI that has been defined as having the

vendor name of Cisco using the

Router# clear cable modem oui Cisco reset

The following example shows how to reset all CMs that are currently in one of the reject states:

Router# clear cable modem reject reset

Related Commands

Modification

The all option was removed from the Release 12.2 BC train, and replaced

with the interface option.

The cable interface was made an optional keyword for this command.

cable modem vendor

Cisco Broadband Cable Command Reference Guide

clear cable modem reset

Broadband cable