sdpBindTlsStpOperProtocol 1.3.6.1.4.1.6527.3.1.2.4.4.6.1.28

The value of the object sdpBindTlsStpOperProtocol indicates whether stp, rstp or mstp is running on this spoke sdp. If the protocol is not enabled on this spoke-sdp the value notApplicable is returned.