A method of allowing a client (12, 13) with a Media Access Control, MAC, address to re-initiate a Dynamic Host Configuration Protocol, DHCP, request after undergoing a Virtual Local Area Network, VLAN, change at a Network Access Server, NAS, from a first VLAN to a second VLAN, wherein a leaf comprised of a plurality of Layer 2, L2, bridges or switches (5, 9) is connected to the NAS, the method comprising the steps of: sending, by the NAS, a first message downlink to at least one L2 bridge or switch of the plurality of L2 bridges or switches; at each L2 bridge or switch in the plurality of L2 bridges or switches, after receiving the first message from the NAS or from another L2 bridge or switch of the plurality of L2 bridges or switches: determining whether the client is directly or indirectly connected to a port of the respective L2 bridge or switch, and if the client is directly connected, bouncing the port to which the client is connected, and sending a second message uplink to the NAS or to another L2 bridge or switch of the plurality of L2 bridges or switches, if the client is indirectly connected, sending the first message downlink, via the port to which the client is indirectly connected, to another L2 bridge or switch of the plurality of L2 bridges or switches, or if the client is not connected directly or indirectly to a port of the respective at least one intermediate L2 bridge or switch, sending a third message uplink to the NAS or another L2 bridge or switch of the plurality of L2 bridges or switches; and after receiving the second or third message from downlink, forwarding the second or third message uplink to the NAS or to another L2 bridge or switch in the leaf; and initiating, by the client, a DHCP request in the second VLAN. sending, by the NAS, a first message downlink to at least one L2 bridge or switch of the plurality of L2 bridges or switches; at each L2 bridge or switch in the plurality of L2 bridges or switches, after receiving the first message from the NAS or from another L2 bridge or switch of the plurality of L2 bridges or switches: determining whether the client is directly or indirectly connected to a port of the respective L2 bridge or switch, and if the client is directly connected, bouncing the port to which the client is connected, and sending a second message uplink to the NAS or to another L2 bridge or switch of the plurality of L2 bridges or switches, if the client is indirectly connected, sending the first message downlink, via the port to which the client is indirectly connected, to another L2 bridge or switch of the plurality of L2 bridges or switches, or if the client is not connected directly or indirectly to a port of the respective at least one intermediate L2 bridge or switch, sending a third message uplink to the NAS or another L2 bridge or switch of the plurality of L2 bridges or switches; and after receiving the second or third message from downlink, forwarding the second or third message uplink to the NAS or to another L2 bridge or switch in the leaf; and initiating, by the client, a DHCP request in the second VLAN. determining whether the client is directly or indirectly connected to a port of the respective L2 bridge or switch, and if the client is directly connected, bouncing the port to which the client is connected, and sending a second message uplink to the NAS or to another L2 bridge or switch of the plurality of L2 bridges or switches, if the client is indirectly connected, sending the first message downlink, via the port to which the client is indirectly connected, to another L2 bridge or switch of the plurality of L2 bridges or switches, or if the client is not connected directly or indirectly to a port of the respective at least one intermediate L2 bridge or switch, sending a third message uplink to the NAS or another L2 bridge or switch of the plurality of L2 bridges or switches; and if the client is directly connected, bouncing the port to which the client is connected, and sending a second message uplink to the NAS or to another L2 bridge or switch of the plurality of L2 bridges or switches, if the client is indirectly connected, sending the first message downlink, via the port to which the client is indirectly connected, to another L2 bridge or switch of the plurality of L2 bridges or switches, or if the client is not connected directly or indirectly to a port of the respective at least one intermediate L2 bridge or switch, sending a third message uplink to the NAS or another L2 bridge or switch of the plurality of L2 bridges or switches; and after receiving the second or third message from downlink, forwarding the second or third message uplink to the NAS or to another L2 bridge or switch in the leaf; and initiating, by the client, a DHCP request in the second VLAN.