Roaming Behavior - 3Com 3CRWX120695A Reference Manual

Wireless lan mobility system wireless lan switch manager
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Roaming Behavior

For a client session to be considered a roaming session (and not a new
session), the following criteria must be met:
The client associates or reassociates with a MAP in the Mobility
Domain, and the client already has a session on a different MAP in the
Mobility Domain. The existing session can be in one of two states:
Active—The normal state for a client that has left radio range
without sending a request to disassociate
Deassociated—The state of a client that has sent an 802.11
disassociate frame, but has not roamed or aged out yet
Mobility Domain communications are stable. Generally, the
communications required for roaming are the same as those required
for VLAN tunneling. Roaming between ports on a WX is possible even
if the Mobility Domain is down.
Authentication, authorization, and accounting (AAA) on the MAP to
which the client roams is successful on the first attempt. An
authentication or authorization failure clears the client session.
Depending on when the failure occurs, roaming can be disqualified or
delayed.
The client uses the same authorization parameters for the new session
as for the old session. For example, changing the Encryption-Type or
VLAN-Name parameter might cause a new session to be recorded,
rather than a roam within the same session.
A disassociated session has a grace period of 5 seconds in which the
session history can be retrieved and forwarded. After 5 seconds, the
session is cleared, and its accounting is stopped. You cannot configure
the grace period.
If the client MAC address in a Mobility Domain is not found in 5 seconds,
the session is considered new.
The 802.1X reauthentication timeout has little impact on roaming. If the
timeout lapses, 802.1X processing is performed on the existing
association. Accounting and roaming history are not affected if the
reauthentication is successful, because the client is still associated with
the same MAP. If reauthentication fails, the session is cleared, and it is not
eligible for roaming. If the client associates to the same MAP, that is
recorded as a new session.
Defining a Mobility Domain
89

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