Inter Access Point Protocol

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The Inter Access Point Protocol (IAPP) is a protocol for cross-manufacturer communication between access points . It was adopted as a recommendation in the IEEE standard 802.11f in 2003 and withdrawn again in 2006.

IAPP is used for roaming clients between different access points. Roaming was not defined in the 802.11 standard . Roaming was implemented on a manufacturer-specific basis.

Communication between the access points takes place via multicast . When a client changes to another access point (handover request), the accepting access point informs the formerly operating access point. The former access point then deletes the client from its station table. Since the accepting access point transmits this information with the source MAC address of the client, switches available in the LAN learn the new route and can thus update their assignment table.

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