etsysStpDiagCistBridgePortMstCistTcTx 1.3.6.1.4.1.5624.1.2.29.1.3.2.1.15

The total number of 802.1s BPDUs transmitted on this port with the Topology Change flag set in the CIST Flags field. These BPDUs are included in the overall count of 802.1s BPDUs transmitted in the etsysStpDiagCistBridgePortMstBpduRx object.