Thanks for answer Daniel.

all our ports are set to fastport except when we have IP phone or small switch at the wire terminaison.

We do not have manually priorities set to spanning tree.

As thiese logs are seen since a long time now, we will first upgrade distribution stack (N2000 series ) and core stack (N4032F) too.

Then we will check.

Can you confirm us the link for lastest N4032F FW?

Lionel