sdpBindTlsStpRootGuard 1.3.6.1.4.1.6527.3.1.2.4.4.6.1.39

The value of the object sdpBindTlsStpRootGuard specifies whether this port is allowed to become STP root port. It corresponds to the parameter 'restrictedRole' in 802.1Q. If set, it can cause lack of spanning tree connectivity.