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Knowledge Base

Serial Port Is Printing the Error Message "lsw flush" All the Time

Publication Date:  2015-07-25  |   Views:  1412  |   Downloads:  0  |   Document ID:  EKB1000073636


Issue Description

The customer reports that the serial port on the newly delivered U1930 is printing error messages "lsw flush" and "phy 1 is invalid" all the time, which affects the configuration, as shown in the following figure.

Handling Process

Ask the customer to connect the device to a switch through an Ethernet cable. The alarm information printing stops and the fault is rectified.

Root Cause

According to the messages, the error is related to the LAN switch. The fault is caused by network problems. Ask the customer to check the network. The customer finds that no network cable is connected to the U1930.