zxr10PortGroupProtectDirection reports whether the port group's protection switching acts in one direction only or in both directions together, per its description. This matters to an admin troubleshooting an asymmetric failover, since a bidirectional(3) group switches both the transmit and receive paths together while a unidirectional(2) group may switch only one direction independently. For example, seeing bidirectional(3) on a group tells an admin that a fault detected on either end will trigger a coordinated switch on both directions of that port group.