Siemens EF 711 Series Betriebsanweisung Seite 387

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Configuring Mobility
Mobility Domain Topologies
SCALANCE WLC711
User Guide, V8.11, 07/2012, C79000-G8976-C260-03 13-3
Mobility Domain Topologies
You can configure a mobility domain in the following scenarios:
Mobility domain without any availability
Mobility domain with availability
Mobility domain with session availability
Note:
If you are configuring mobility, you must synchronize time on all the SCALANCE IWLAN Controllers that are
part of the mobility domain. For more information, see “Configuring Network Time” on page 2-49.
Figure 13-1 Mobility Domain with Fast Failover and Session Availability Features
The users home session is with Controller1.
When the user roams from Wireless AP 1 to Wireless AP 2, he establishes his home session
with Controller2.
When the user roams, the Wireless AP 1 receives a notification that the user has roamed away
following which it marks the user session as “inactive”. Consequently, no statistics are sent to
the Controller1 for that user.
In response to the heart beat message from the mobility manager (Controller3), the
Controller2 sends updates that the user has a new home on Controller2. Upon receiving the
updates, the mobility manager updates its own tables.
Note:
The mobility manager’s heart beat time is configurable. If you are configuring a mobility domain with session
availability, you should configure the heart beat time as one second to enable the mobility manager to update
its tables quickly.
• Controller1 and
Controller 2 are
configured for
session availability.
• Controller1,
Controller2,
Controller3, Wireless
AP1, Wireless AP2
and Wireless AP3
form a Mobility
Domain
• Controller3 is the
Mobility Manager
whereas Controller1
and Controller2 are
Mobility Agents
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