SW_MATM-4-MACFLAP_NOTIF

[harry pugin]

I need to see how to solve the flapping that occurs in a pair of stack switch in 3750, I have a SUN server computers connected to both network cards in virtual mode and produces the following log on the switch:

SW_MATM-4-MACFLAP_NOTIF: Host 0014.4f3e.b02e in vlan 9 port is flapping entre Gi2/0/7 Gi1/0/7 and port.

While the port are assigned to the vlan 9, spannig tree configuration is:

spanning-tree mode PVST
spanning-tree etherchannel guard misconfig
spanning-tree extend system-id
spanning-tree vlan priority 1-2,9,248 0.

How I can improve this? Passes through the configuration of spanning tree or is a problem of configuration of the server's network card.
by hap