Extreme Networks Summit WM User Manual page 255

Mobility domain with session availability
NOTE
If you are configuring mobility, you must synchronize time on all the Summit WM Controllers that are part of the
mobility domain. For more information, see
Figure 23: Mobility Domain with fast failover and session availability features
The user's home session is with WM1.
When the user roams from Wireless AP 1 to Wireless AP 2, he establishes his home session with
WM2.
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
WM1 for that user.
In response to the heart beat message from the mobility manager (WM3), the WM2 sends updates
that the user has a new home on WM2. 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 mobility domain with session
availability, you should configure the heart beat time as one second in order to enable the mobility manager to
update its tables fast.
Summit WM User Guide, Software Version 5.3
"Configuring network time" on page 56.
WM1 and WM2 are
configured for session
availability.
WM1, WM2, WM3,
Wireless AP1,
Wireless AP2 and
Wireless AP3 form a
Mobility Domain
WM3 is the Mobility
Manager whereas
WM1 and WM2 are
Mobility Agents
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