Switch Ports on 2920-24g-poe+ toggle on/off constantly

[MG2018]

Hi, we have some HP 2920-24g-poe+ Switches showing that connected ports
are toggling on/off constantly. The Logs are showing:

10/16/18 08:52:43 00077 ports: port 9 is now off-line
10/16/18 08:52:46 00076 ports: port 9 is now on-line
10/16/18 08:53:27 00077 ports: port 9 is now off-line
10/16/18 08:53:30 00076 ports: port 9 is now on-line
10/16/18 09:09:50 00077 ports: port 9 is now off-line
10/16/18 09:09:52 00076 ports: port 9 is now on-line
10/16/18 09:10:41 00077 ports: port 9 is now off-line
10/16/18 09:10:42 00076 ports: port 9 is now on-line

All connected ports are affected.
Spanning Tree and Energy-Efficient-Ethernet is disabled.
Any Ideas how to fix this?

[MG2018]

163 Views and nobody has an idea?

[frenchy94]

What is firmware version ?

What kind of devices are connected to these ports ?



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L'absence de virus dans ce courrier électronique a été vérifiée par le logiciel antivirus Avast.
https://www.avast.com/antivirus

[MG2018]

Hi,

Firmware is 16.06.0006 - and connected devices are of all kinds from printers to "normal PCs" to virtual Desktop-Devices (which suffer the most from this issue).

I already changed the configuration from "auto" to "auto 100" and "auto 1000" with no effect. Changing to 100FDX causes RX/TX Errors.

Switches are monitored by an NAC, but I don´t really know if this could be the reason...:-/

[frenchy94]

Speed and mode must match on both end



---
L'absence de virus dans ce courrier électronique a été vérifiée par le logiciel antivirus Avast.
https://www.avast.com/antivirus

[MG2018]

Yes, sure. Any other ideas why the ports turn on/off repeatedly?

[frenchy94]

Does problem appears also when device connected are power off ?



---
L'absence de virus dans ce courrier électronique a été vérifiée par le logiciel antivirus Avast.
https://www.avast.com/antivirus

[MG2018]

Hi,

when the connected Device is powered off, the port is going down until device is powered on again.

While testing this with a Laptop booting Windows, I recognized that the port is also going on/off several times during the windows boot process. Is this behaviour normal? The logs show:

I 11/07/18 08:52:24 00076 ports: port 7 is now on-line
I 11/07/18 08:52:24 00076 ports: port 7 is now on-line

I 11/07/18 08:52:25 00077 ports: port 7 is now off-line
I 11/07/18 08:52:30 00076 ports: port 7 is now on-line
I 11/07/18 08:52:43 00077 ports: port 7 is now off-line
I 11/07/18 08:52:46 00076 ports: port 7 is now on-line
I 11/07/18 08:53:05 05101 amp-server: AMP server configuration is disabled due
            to first configuration.
I 11/07/18 08:53:06 00077 ports: port 7 is now off-line
I 11/07/18 08:53:09 03125 mgr: Startup configuration changed by SNMP.  New seq.
            number 15830
I 11/07/18 08:53:10 00076 ports: port 7 is now on-line
I 11/07/18 08:54:26 00077 ports: port 7 is now off-line

[frenchy94]

Yes this is a normal behavior during boot up process, will problem still
occurs after boot up



---
L'absence de virus dans ce courrier électronique a été vérifiée par le logiciel antivirus Avast.
https://www.avast.com/antivirus

[MG2018]

Yes, if i would wait an unknown amount of time, then it will occur in irregular intervals.

Normally, a user doesn´t recognize this "toggling", except when working on one of our thin clients, where the desktop freezes and the user is - in worst case - kicked out of the session.