This object indicates whether the port is enabled to send or receive BPDUs.
disable(1): indicates that the function of sending or receiving BPDUs is in the disabled state on the port.
enable(2): indicates that the function of sending or receiving BPDUs is in the enabled state on the port.
undo(3): indicates that the port is not configured with the function of sending or receiving BPDUs.
By default, a port is not configured with the function of sending or receiving BPDUs.