Extreme Networks WM20 Controller Guide de l'utilisateur Page 151

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Summit WM20 User Guide, Software Release 4.2 151
6 Availability and Controller Functionality
This chapter describes the availability concepts, including:
“Availability Overview” on page 151
“Defining Management Users” on page 157
“Configuring Network Time” on page 158
“Configuring Check Point Event Logging” on page 160
“Enabling SNMP” on page 162
“Using Controller Utilities” on page 164
“Configuring Web Session Timeouts” on page 166
The Summit WM Controller provides additional functionality including:
Availability – Maintains service availability in the event of a Summit WM Controller outage
Availability Overview
The Summit WM Controller, Access Points and Software system provides this feature to maintain
service availability in the event of a Summit WM Controller outage.
The availability feature links two Summit WM Controllers as a pair, to share information about their
Wireless APs. If one controller fails, its Wireless APs are allowed to connect to the backup controller.
The second Summit WM Controller provides the wireless network and a pre-assigned WM-AD for the
Wireless AP.
NOTE
During a failover event, the maximum number of failover APs a backup controller can accommodate is equal to the
maximum number of APs supported by the hardware platform.
NOTE
Wireless APs that attempt to connect to a backup 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 Wireless
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 Wireless 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 AP configuration assignment is only applicable to new APs that failover to the backup controller.
Any AP that has previously failed-over and is already known to the backup system will receive the configuration
already present on that system.
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