Today we had a problem on a trunk port within a HP Blade Center 7000 configured with Cisco 3020 switches. The port that was connected to a blade was sending BPDU packets on one of our main production vlans causing constant topology changes. The server infrastructure folks claim that while a blade was installed there was no OS on it yet.
On access ports we have BPDU guard enabled to prevent this type of problem. What can we use on trunk ports that are connected to servers to keep this problem from occurring in the future?