Hi Dear,
recently I have a problem with network access due to Spanning Tree spam...

I have a N5200PRO. I have attached all my hosts to 5200's switch.
Sometimes happens that when I poweroff a host I see all this messages on the network:
07:10:14.712241 00:00:00:00:00:00 (oui Ethernet) > 01:80:c2:00:00:01 (oui Unknown)
, ethertype Unknown (0x8808), length 60:
0x0000: 0001 ffff 0000 0000 0000 0000 0000 0000 ................
0x0010: 0000 0000 0000 0000 0000 0000 0000 0000 ................
0x0020: 0000 0000 0000 0000 0000 0000 0000 ..............
07:10:14.742253 00:00:00:00:00:00 (oui Ethernet) > 01:80:c2:00:00:01 (oui Unknown)
, ethertype Unknown (0x8808), length 60:
0x0000: 0001 ffff 0000 0000 0000 0000 0000 0000 ................
0x0010: 0000 0000 0000 0000 0000 0000 0000 0000 ................
0x0020: 0000 0000 0000 0000 0000 0000 0000 ..............

And I lost the network communications.

Is there any way to disable spanning tree or to solve my problem?
Thanks
Zioalex