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what is this error line over 3660 router:04:44:54: CIRRUS-5-LINEFLAP: Unit 5 excessive modem control changes

the serial of the 3660 router go down and up, and it carries out this error:04:44:54: CIRRUS-5-LINEFLAP: Unit 5 excessive modem control changes

what is this error?

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Anonymous
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Re: what is this error line over 3660 router:04:44:54: CIRRUS-5-

Explanation: The specified asynchronous interface was determined to have too many automatic control changes in too short a span of time. This error may indicate a hardware or software error in the interface.

Recommended Action: Reset the interface. If this message recurs, copy the message exactly as it appears on the console or in the system log, contact your Cisco technical support representative, and provide the representative with the gathered information.

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