tmnxPtpPeerLastTxPortEncapValue 1.3.6.1.4.1.6527.3.1.2.74.2.3.1.16

The value of tmnxPtpPeerLastTxPortEncapValue along with tmnxPtpPeerLastTxPortId and tmnxPtpPeerLastTxPortEncapType indicates the last port used to transmit PTP packets to the PTP peer.