Method, device and system for WLAN user roaming in wireless local area network

Abstract

The present application discloses a roaming method, device and system for a WLAN user. After the wireless terminal of the user roams three layers, the associated foreign access point FAP receives the first message sent by the wireless terminal; the FAP according to the The first packet searches the pre-established user table to obtain the encapsulation entry of the first roaming tunnel for forwarding the first packet, and the tunnel outer layer destination IP address of the encapsulation entry of the first roaming tunnel is the wireless The IP address of the home access point HAP before the terminal roams, and the tunnel outer layer source IP address of the encapsulation entry of the first roaming tunnel is the IP address of the FAP; The entry encapsulates the first packet; the FAP sends the encapsulated first packet to the HAP through the first roaming tunnel. Because in most campus network scenarios, since users can roam between APs, the distance between these APs is generally not too far. Therefore, directly establishing tunnels between APs can greatly shorten the forwarding path of the roaming tunnel and improve forwarding efficiency. The benefits are obvious, and the establishment time of the roaming tunnel is shortened, thereby shortening the service interruption time of the user during the roaming process.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a WLAN user roaming method, device and system. Background technique [0002] With the increasing maturity of wireless local area network (Wireless Local Area Network, WLAN) technology, in a typical enterprise campus network scenario, it has become a trend to provide a WLAN wireless access function. More and more campus networks have begun to deploy WLAN, such as corporate offices, indoor / outdoor stadiums, venues / theatres / exhibition halls, classrooms / training centers, etc., to provide users with low-cost, ultra-broadband, stable and convenient, anytime, anywhere Wi-Fi experience. [0003] Among them, one of the important advantages of WLAN over wired access is to support user mobility, and it is an important issue of WLAN to ensure that the service experience of users is still smooth and unaffected during roaming. Roaming means that services of a wireless terminal remain ...

AI Technical Summary

Problems solved by technology

In the Layer 3 roaming scenario, to ensure uninterrupted user services, the IP address carried in the packet sent by the user and the service VLAN information added by the AP cannot be changed, that is, the service VLAN information and However, since the user has roamed to a foreign network where APs joining different service VLANs are located, the message cannot be forwarded through the gateway device of the foreign network. The solution to this problem in the prior art generally uses lengthy forwarding The forwarding efficiency is low, and the user service interruption time is long during the roaming process. Therefore, how to better realize the three-layer roaming needs to be solved urgently.

Images