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30 | Mobility Controller and Access Point Deployment Campus Wireless Networks Validated Reference Design Version 3.3 | Design Guide
VLAN Pools
Network administrators prefer to keep subnet sizes down to what is commonly referred to as class C
network. This is a network with a subnet mask of /24 (255.255.255.0), yielding 253 user devices per
subnet. This size is considered manageable and will limit the broadcast domain size. In networks where
this subdivision needs to be logical as opposed to physical VLANs are employed to limit broadcast
domain size.
One legacy methodology for dividing up large groups of wireless users is to take a set of APs and have
all users associated with those APs placed in a single VLAN. Each set then would have one of the user
VLANs associated with it. This method works if the user count never goes above the user count limit for
that subnet; and if users have no need to roam outside of the AP group. However, this method tends to
fail when large groups of users need to meet in a single location like a lecture hall, or an ‘all hands’
meeting.
arun_048
VLAN 10 VLAN 40
VLAN 30VLAN 20
Mobility
controller