A method in a first wireless device of a wireless local area network, WLAN, the first wireless device including a transmitter and modulator for transmitting, and MAC hardware coupled to the transmitter and modulator, the method comprising: for a particular network identifier active in a wireless network, the wireless network supporting a set of one or more network identifiers and having at least one of the set active, each network identifier identifying an infrastructure wireless network of a wireless local area network, WLAN, each infrastructure wireless network having an access point transmitting beacon frames at a beacon frame rate, transmitting off-channel beacon frame (500, 800) from the first wireless device, the off-channel beacon frame being configured to advertise the infrastructure wireless network of the particular network identifier by including advertising information advertising the infrastructure wireless network, the transmitting of off-channel beacon frames being in a provided off-channel-beacon channel different than the channel in which the access point of the infrastructure wireless network of the particular network identifier transmits beacon frames, the transmitting of off-channel beacon frames further being at a rate higher than the beacon frame rate at which the access point of the infrastructure wireless network of the particular network identifier transmits beacon frames, the advertising information in the off-channel frames including information that indicates the channel or channels where the beacon frames of the advertised infrastructure network or networks are being transmitted, such that a second wireless device (11, 12, 21, 22, 23, 24) receiving the off-channel beacon frame can use the information in the off-channel beacon frame to switch to any of the channels of the infrastructure wireless network or networks advertised in the off-channel beacon frame and/or to choose whether or not to associate or reassociate with the channel of any infrastructure network advertised in the off-channel beacon frame, the second wireless device being configured to interpret the information in the off-channel beacon frame that advertises the one or more infrastructure wireless networks. for a particular network identifier active in a wireless network, the wireless network supporting a set of one or more network identifiers and having at least one of the set active, each network identifier identifying an infrastructure wireless network of a wireless local area network, WLAN, each infrastructure wireless network having an access point transmitting beacon frames at a beacon frame rate, transmitting off-channel beacon frame (500, 800) from the first wireless device, the off-channel beacon frame being configured to advertise the infrastructure wireless network of the particular network identifier by including advertising information advertising the infrastructure wireless network, the transmitting of off-channel beacon frames being in a provided off-channel-beacon channel different than the channel in which the access point of the infrastructure wireless network of the particular network identifier transmits beacon frames, the transmitting of off-channel beacon frames further being at a rate higher than the beacon frame rate at which the access point of the infrastructure wireless network of the particular network identifier transmits beacon frames, the advertising information in the off-channel frames including information that indicates the channel or channels where the beacon frames of the advertised infrastructure network or networks are being transmitted,