This read-only enumerated value reports whether the protection group switches uniDirectional(1), the default, meaning only the affected direction of traffic switches, or biDirectional(2), meaning both directions switch together even if only one direction faulted. An admin checks this to understand whether a single-direction fault will cause an asymmetric routing situation (uni-directional) or force both directions onto protection together (bi-directional). For example, h3cTeTunnelPsSwitchMode=biDirectional(2) means a fault detected only in the receive direction will still cause the transmit direction to switch to protection as well.