H3C Technologies H3C WX6000 Series Access Controllers - Manual (Page 338)

33-2
Fast-roam capable station: A wireless station which directly associates to an AC in the
mobility-group, and supports fast-roam service (supporting key caching).
Roam-out station: A wireless station which has associated with an AC other than the HA in the
mobility-group is referred to as a roam-out station at its HA.
Roam-in station: A wireless station which has associated with an AC other than the HA in the
mobility-group is referred to as a roam-in station at the FA.
Intra-AC roaming: A procedure where a wireless station roams from one AP to another AP, which
are connected to the same AC.
Inter-AC roaming: A procedure where a wireless station roams from one AP to another AP, which
are connected to different ACs.
Inter-AC fast roaming capability: If a station uses 802.1x (RSN) authentication through
negotiation and supports key caching, this station has inter-AC fast roaming capability.
WLAN Roaming Topologies
WLAN Roaming topologies consist of:
Intra-AC roaming topology
Inter-AC roaming topology
Intra-FA roaming topology
Inter-FA roaming topology
Roam-back topology
Intra-AC roaming
Figure 33-1 Intra-AC roaming
IP network
AC
AP 1 AP 2
Intra-AC
roaming
Fast-roam
association
Intra-AC roam
association
1) A station is associated with AP 1, which is connected to an AC.
2) The station disassociates with AP 1 and roams to AP 2 connected to the same AC.
3) The station is associated with AP 2 through intra-AC roam association.