In one embodiment, a method comprises: detecting, by a wireless mirror device in a wireless data network, link layer transmission of a wireless data unit between a wireless access point (AP) device and a wireless client device on a first allocated frequency channel at a first transmission interval; and transmitting, by the wireless mirror device based on detecting the link layer transmission, the wireless data unit at a second transmission interval on a second allocated frequency channel that is allocated to the wireless mirror device for a mirror transmission between the wireless AP device and the wireless client device at the second transmission interval.