SG500-52P switching to master mode

[ocs-9]

On random occurences I see the following events in the logs:

2147483591	2018-Aug-15 13:12:08	Informational	%MLDP-I-MASTER: Switching to the Master Mode.
2147483592	2018-Aug-15 13:11:59	Warning	%MLDP-W-ABORT: Connection to Unit 1 is aborted due to Stack Management notification.

2147483593

2018-Aug-15 13:11:59

Informational

%Stack-I-STCK-MSTR-SWTCHOVR: Master switchover: unit 2 is now master.

Shortly after all ports go down for about 1-2 min and then come up.  This drops all network activity and connections on those ports.  Has anyone else seen these events and activity?

Software Information
Firmware Version (Active Image):	1.4.9.4

System Summary

System Information
System Stack Mode:	Native Stacking
System Operational Mode:	L2 Mode

[Georg Pauwen]

Hello,

I couldn't find any bugs. Try and reseat the cables, and if possible make another stack member the master...

[paul driver]

Hello

Can you post the output of the following please:

show switch detail
show switch stack-port

show switch neighbors

show switch stack-ring

show version

[ocs-9]

the first four commands you requested are not known on this switch.

CiscoSwitchStack#show ver

       Unit             SW version         Boot version         HW version    
------------------- ------------------- ------------------- -------------------
         1                1.4.9.4            1.4.0.02               V02       
         2                1.4.9.4            1.4.0.02               V02       
         3                1.4.9.4            1.4.0.02               V05   

[ocs-9]

CiscoSwitchStack#sh stack

Current stack mode is  : native
Topology is Ring
Stack image auto synchronization is enabled


Unit Model Name     MAC Address       Software  Master   Status
---- -------------- ----------------- --------- -------- ------
1    SG500-52P      0c:68:03:9a:ce:ed 1.4.9.4   Enabled  backup

2    SG500-52P      0c:68:03:9c:c7:b9 1.4.9.4   Enabled  master

3    SG500-52P      c4:72:95:2c:3c:2f 1.4.9.4   Disabled slave



Unit Port  Connected  Port    Administrative Operational
No.        Unit       Status  Speed          Speed
---- ----- --------- -------- -------------- -----------
1    S3    2         active   Auto           5G
     S4    3         active   Auto           5G
2    S3    3         active   Auto           5G
     S4    1         active   Auto           5G
3    S3    1         active   Auto           5G
     S4    2         active   Auto           5G


After Reboot Configuration:

Current  New      Stack Mode         Stack Ports                        Speed
Unit No. Unit No.
-------- -------- ------------------ ---------------------------------- -----
1        Auto     native             S3-S4                              Auto
2        Auto     native             S3-S4                              Auto
3        Auto     native             S3-S4                              Auto