Normal UE processing for WLAN-GW is performed on the H-GW. After tunnel decapsulation, the UE is received on the anchor ISA. If the UE state already exists on the anchor ISA, then it is treated as a mobility event, and the tunnel information in the UE (to the tunnel toward the V-GW). A mobility-triggered interim-update, if configured, is generated. The AP’s MAC address must be reflected in called-station-ID attribute. The AP MAC is learned from the DHCP circuit-ID. However, if the mobility trigger is a data packet and the tunnel type is L2oGRE, then an ARPoGRE is generated (if configured) to learn the AP MAC. The V-GW forwards ARPoGRE is received on x-connect tunnel to the access tunnel toward the AP and reflects the received response back on x-connect tunnel. If the x-connect tunnel is type L2TPv3, then the AP MAC address can be carried in the cookie field. If the UE state does not exist, then normal UE processing leads to authentication and subsequent UE creation (as DSM or ESM UE).
IPv6 tunnel reassembly is not supported.