Controller (MC)—The controller provides mobility management services for
inter-peer group roaming events. The MC provides a central point of contact for
management and policy based control protocols, such as RADIUS. This eliminates
the need for the infrastructure servers to maintain a user's location as it
transitions throughout the network. The MC sends the configuration to all the
mobility agents under its sub-domain of their mobility configuration, peer
group membership and list of members. A sub-domain is synonymous to the MC that
forms it. Each sub-domain consists of an MC and zero or more access switches
that have AP's associated to them.
(MA)— A mobility agent is either an access switch that has a wireless module
running on it or an MC with an internal MA running on it. A mobility agent is
the wireless component that maintains client mobility state machine for a
mobile client that is connected via an AP to the device that the MA is running
Domain— It is an autonomous portion of the mobility domain network. A mobility
sub-domain comprises of a single mobility controller and its associated
mobility agents (MAs).
A mobility sub-domain is the set of devices managed by the
active mobility controller. A mobility sub-domain comprises of a set of
mobility agents and associated access points.
more than one mobility controller is present, only one MC can be active at any
Mobility Group— A
collection of mobility controllers (MCs) across which fast roaming is
supported. The concept of mobility group is the same as a collection of
buildings in a campus across which frequent roaming is expected.
Mobility Domain— A
collection of mobility sub-domains across which mobility is supported. The term
mobility domain may be the same as a campus network.
(MO)—The mobility oracle acts as the point of contact for mobility events that
occur across mobility sub-domains. It also maintains a local database of each
station in the entire mobility domain, their home and current sub-domain. A
mobility domain includes one or more mobility oracle, though only one would be
active at any given time.
Endpoint (MTE)— The mobility tunnel endpoint (MTE) provides data plane services
for mobile devices through the use of tunneling. This minimizes the impact of
roaming events on the network by keeping the user's point of presence on the
network a constant.
Attachment— A station's point of attachment is where its data path is initially
processed upon entry in the network. This could either be the access switch
that is currently providing it service, or the wireless LAN controller.
Point of Presence—
A station's point of presence is the place in the network where the station is
being advertised. For instance, if an access switch is advertising reachability
to the station via a routing protocol, the interface on which the route is
being advertised is considered the station's point of presence.
Switch Peer Group
(SPG)— A peer group is a statically created list of neighboring access switches
between which fast mobility services is provided. A peer group limits the scope
of interactions between switches during handoffs to only those that are
device that connects to and requests service from the network. The device may
have a wired, wireless or both interfaces.
Switch in the same
SPG—A peer switch that is part of the peer group of the local switch.
the SPG—A peer access switch that is not part of the local switch's peer group.
Controller— The mobility controller providing mobility management service for
the station in a foreign mobility sub-domain. The foreign mobility controller
acts as a liaison between access switches in the foreign sub-domain and the
mobility controller in the home domain.
Sub-Domain— The mobility sub-domain, controlled by a mobility controller,
supporting a station which is anchored in another mobility sub-domain
The access switch in the foreign mobility sub-domain currently providing
service to the station.
Controller— The mobility controller providing a single point of control and
mobility management service for stations in their home mobility sub-domain.
Sub-Domain— The mobility sub-domain, controlled by a mobility controller, for a
station where its IP address was assigned.
The switch in the home mobility sub-domain that last provided service to a