The APs maintain these configured client limits and enforce them once they reach the limits by
withholding probe responses and authentication responses on any radio that has reached its
limit.
Key Points About Client Load Balancing
Before you enable load balancing, keep the following considerations in mind:
• The load balancing rules apply only to client devices; the AP always responds to another AP
that is attempting to set up or maintain a mesh network.
• Load balancing does not disassociate clients already connected.
• Load balancing takes action before a client association request, reducing the chance of client
misbehavior.
• The process does not require any time-critical interaction between APs and the controller.
• Provides control of adjacent AP distance with safeguards against abandoning clients.
• Can be disabled on a per-WLAN basis. For instance, on a voice WLAN, load balancing may
not be desired due to voice roaming considerations.
• Background scanning must be enabled on the WLAN for load balancing to work.
Band Balancing
Band balancing balances the client load on radios by distributing clients between the 2.4GHz
and 5GHz radios. This feature is enabled by default and set to a target of 25% of clients
connecting to the 2.4GHz band. To balance the load on a radio, the AP encourages dual-band
clients to connect to the 5GHz band when the configured percentage threshold is reached.
Bypassing Apple CNA
Some Apple iOS and OS X clients include a feature called Captive Network Assistant (CNA),
which allows clients to connect to an open captive portal WLAN without displaying the logon
page.
When a client connects to a wireless network, the CNA feature launches a pre-browser login
utility and it sends a request to a success page on the Apple website. If the success page is
returned, the device assumes it has network connectivity and no action is taken. However, this
login utility is not a fully functional browser, and does not support HTML, HTML5, PHP or other
embedded video. In some situations, the ability to skip the login page for open WLANs is a
benefit. However, for other guest or public access designs, the lack of ability to control the entire
web authentication process is not desirable.
The controller provides an option to work around the Apple CNA feature if it is not desirable for
your specific deployment. With CNA bypass enabled, captive portal (web-based authentication)
logon must be performed by opening a browser to any unauthenticated page (HTTP) to get
redirected to the logon page.
SmartCell Gateway 200/Virtual SmartZone High-Scale for Release 3.4.1 Administrator Guide
77
Managing Ruckus Wireless AP Zones
Working with WLANs and WLAN Groups
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