LANCOM WLC
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4006 - LANCOM WLC
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4025
Chapter 4: Configuring the WLAN Controller
72
EN
햴
Configure the first WLAN Controller
쐃
as required with the profiles and
the associated AP table for one half of the Access Points. This WLAN
Controller becomes the primary controller for the Access Points entered
into it.
For a backup solution using a secondary WLAN Controller, be sure to
set the time for self-sufficient operations such that the Access Point
has time to find a backup controller. This is because the backup con-
troller is not able to provide a new configuration for the Access Point.
Once the Access Point has established a backup connection to a sec-
ondary WLAN Controller the countdown until expiry of self-sufficient
operation is halted. The Access Point and its WLAN networks remain
active as long as it has a connection to a WLAN Controller.
햵
Configure the second WLAN Controller
쐇
for the other half of the Access
Points, which subsequently treat this WLAN Controller as their primary
controller.
햶
For the backup controller
쐋
, only the time and the root certificate are set
up. There is no further configuration.
햷
After being started, the Access Points search for a WLAN Controller by
emitting a discovery message. In this case, all three LANCOM WLAN
Controllers respond to this message—the Access Points select "their" pri-
mary controller for the DTLS connection that follows. One half of the
Access Points decides on WLAN Controller
쐃
and the other half chooses
WLAN Controller
쐇
. Because WLAN Controller
쐋
does not function as
primary controller for any of the Access Points, none of them log on to it.
햸
In case of failure of, for example, WLAN Controller
쐇
, the Access Points
automatically start searching for another WLAN Controller. They discover
the WLAN Controller
쐃
and
쐋
, whereby
쐃
is already under full load
with its 25 Access Points. Backup controller
쐋
is able to check the validity
of the certificates, i.e. it can authenticate the Access Points and accept
them as managed Access Points. However, because the Access Points are
not
entered with their MAC numbers into the backup controller's AP
table, the backup controller cannot manage the Access Points any further;
they simply continue to operate with their current WLAN configurations.
If WLAN Controller
쐃
is not under full load, for example because
some of "its" Access Points are switched off, then some of the search-
ing Access Points could log on here. WLAN Controller
쐃
remains a