802.11 Fast BSS Transition (FT) Part 2 of 2
The IEEE 802.11r amendment introduces a new 3-tier AKM architecture and some new terminology such as Mobility Domain, Key Holders, RICs, and two tiers of Pairwise Master Keys (PMKs). A Mobility Domain is a set of BSSs, within the same ESS, identified by a Mobility Domain Identifier (a numerical value). Fast BSS Transition (FT) is not specified between Mobility Domains. The definition of an authenticator is, under the new amendment, split into two pieces – each being responsible for certain tasks. These two pieces are called the PMK-R0 Key Holder (R0KH) and the PMK-R1 Key Holder (R1KH). These could, in many instances, be considered the WLAN controller (R0KH) and the lightweight AP (R1KH) though this is not a requirement of the amendment.
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