Siemens Communications Inc. AP36V1A User Manual
Availability, mobility, and controller functionality
hwc_controlleravailmobility.fm
Availability overview
A31003-W1050-U100-2-7619
,
March 2008
252
HiPath Wireless Controller, Access Points and Convergence Software V5 R1 , C20/C2400 User Guide
The availability feature links two HiPath Wireless 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 HiPath Wireless
Controller provides the wireless network and a pre-assigned VNS for the Wireless
AP.
information about their Wireless APs. If one controller fails, its Wireless APs are
allowed to connect to the backup controller. The second HiPath Wireless
Controller provides the wireless network and a pre-assigned VNS 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.
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 VNS that is defined in the system’s default AP
configuration provided the administrator has not assigned the failover Wireless
APs to one or more VNSs. If a system default AP configuration does not exist for
the controller (and the administrator has not assigned the failover Wireless APs
to any VNS), the APs will not be assigned to any VNS during the failover.
failover event are assigned to the VNS that is defined in the system’s default AP
configuration provided the administrator has not assigned the failover Wireless
APs to one or more VNSs. If a system default AP configuration does not exist for
the controller (and the administrator has not assigned the failover Wireless APs
to any VNS), the APs will not be assigned to any VNS during the failover.
A HiPath Wireless Controller will not accept a connection by a foreign AP if the
HiPath Wireless Controller believes its availabilitty partner controller is in service.
HiPath Wireless Controller believes its availabilitty 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.
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.
For more information, see
Section 4.5.7, “Configuring the default Wireless AP
settings”, on page 128
.
From the viewpoint of a Wireless AP, if a HiPath Wireless Controller or the
connection to it fails, the Wireless AP begins its discovery process. The Wireless
AP is directed to the appropriate backup controller of the pair. This connection
may require the Wireless AP to reboot. Users on the Wireless AP must log in
again and be authenticated on the second HiPath Wireless Controller.
connection to it fails, the Wireless AP begins its discovery process. The Wireless
AP is directed to the appropriate backup controller of the pair. This connection
may require the Wireless AP to reboot. Users on the Wireless AP must log in
again and be authenticated on the second HiPath Wireless Controller.
Note: The availability feature provides APs with a list of interfaces to which the
AP should attempt to automatically connect to when a connection with an active
controller link is lost. The provided list identifies the local active interfaces
(enabled on the primary and backup controllers) for the active controller as well
as the active interfaces for the backup controller. The list is sorted by top-down
priority. If the active link is lost (poll failure), the AP automatically scans (pings) all
addresses in its availability interface list. The AP will then connect to the highest
priority interface that responds to its probe.
AP should attempt to automatically connect to when a connection with an active
controller link is lost. The provided list identifies the local active interfaces
(enabled on the primary and backup controllers) for the active controller as well
as the active interfaces for the backup controller. The list is sorted by top-down
priority. If the active link is lost (poll failure), the AP automatically scans (pings) all
addresses in its availability interface list. The AP will then connect to the highest
priority interface that responds to its probe.