hwdot1sMstiStpPortOperBPDUFmt 1.3.6.1.4.1.43.45.1.2.23.1.14.20.1.31

The format of MST BPDU which the port is sending. Value legacy means that the format of MST BPDU sending on the port is legacy. Value dot1s means that the format of MST BPDU sending on the port is IEEE 802.1s. Effective in CIST.