Excerpts from Mobility Design Guide-
"The default behavior
of the WLC is to block broadcast and multicast traffic from being sent out the
WLAN to other wireless client devices."
In most of the WLAN designs it is considered safe to use
large subnet sizes if you are not allowing Bcast and not much of Mcast traffic.
As long as the WLC is not propagating Bcast/Mcast traffic
and no spanning tree loops, the Mobility subnet sizing is not a constraint for
WLAN. Usual recommendation to Large deployments is ---no subnet size more than
/20 and /19.
Also it depends so much on the type of traffic specially
Bcast/Mcast traffic. So it is NOT advisable to use large subnet size in case of
Bcast/Mcast/STP loops in N/W.
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