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6
Availability and session availability
This chapter describes the availability feature, including:
"Availability" on page 231
"Session availability" on page 237
"Viewing the Altitude AP availability display" on page 251
"Viewing SLP activity" on page 251
Availability
The Summit WM Software system provides the "availability" feature to maintain service availability in
the event of a Summit WM Controller outage.
The availability feature links two Summit WM Controllers - the primary controller and the secondary
controller (backup controller). The primary and the secondary controllers share information about their
Altitude APs. If the primary controller fails, its Altitude APs failover to the secondary controller. The
secondary controller provides the wireless network and a pre-assigned WM-ADs for the Altitude APs.
NOTE
During the failover event, the maximum number of failover APs the secondary controller can accommodate is equal
to the maximum number of APs supported by the hardware platform.
NOTE
Altitude APs that attempt to connect to the secondary controller during a failover event are assigned to the WM-AD
that is defined in the system's default AP configuration, provided the administrator has not assigned the failover
Altitude APs to one or more WM-ADs. If a system default AP configuration does not exist for the controller (and the
administrator has not assigned the failover Altitude APs to any WM-AD), the APs will not be assigned to any WM-AD
during the failover. A Summit WM Controller will not accept a connection by a foreign AP if the Summit WM
Controller believes its availability partner controller is in service. Also, the default Altitude AP configuration
assignment is only applicable to new APs that failover to the backup controller. Any Altitude AP that has previously
failed over and is already known to the backup system will receive the configuration already present on that system.
For more information, see
"Configuring the default Altitude AP settings" on page 125
During the failover event when the Altitude AP connects to the secondary controller, the users are
disassociated with the Altitude AP. Consequently, the users must log on again and be authenticated on
the secondary controller before the wireless service is restored.
NOTE
If you want the user session to be maintained, you must use the 'session availability' feature that enables the
primary controller's Altitude APs to failover to the secondary controller fast enough to maintain the session
availability (user session). For more information,
Summit WM User Guide, Software Version 5.3
"Session availability" on page
237.
231
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