Problem Description

OSN7500 new opening, COMMUN_FAIL alarm reported after adding SSN1SLT1 board in slot 1, host version 5.21.19.22.

Alarm message

COMMUN-FAIL

Processing

1、Switching a single board to another slot does not report an alarm, suspecting a slot problem;

2、Swap a piece of PQ1 and plug it into slot 1, still report alarm;

3、Check the version of the software supporting the initialization of the database or 1 slot will report an alarm,

4、Replace the main control and motherboard, or report an alarm,

5、Use the following command to open the EXT port (does not support the network management to open)

cfg-set-oamport:EXT,open, and reset EOW, the alarm disappears.

Root cause

Possible reasons for the above phenomenon:

1、The single board open state is not normal;

2、Single board software and master control software mismatch;

3、Main control failure or motherboard failure;

4. Inter-board communication function of 1 slot is disabled;

5, EOW board failure.

Recommendations and Summary

Since the R9C04SPC011 version (5.21.19.22) incorrectly closes the 1-slot communication port when closing the EXT port.

The solution is to open the EXT port and then reset the EOW.

Upgrade to R9C04SPC200 version (5.21.30.15P01) to solve the problem completely.