Indicates the global default mode of the Bpdu
Guard feature on the device.
On platforms that does not support per port
Bpdu Guard configuration as indicated by
the object stpxFastStartPortBpduGuardMode,
if the value of this object is set to true(1),
and the Fast Start Feature is operationally
enabled on a port, then that port will be
immediately disabled when the system receives
a BPDU from that port.