--> Before Cisco WLC 7.0 code, the wireless controller requires separate vlan for each wireless LAN or SSID.
--> This means we need very large subnet to be allocated to the users in auditorium or stadium.
--> The only way to solve this problem is to create multiple SSIDs with different vlan. This is not a popular option across the customers as there is no consistency between SSID and VLAN.
--> With the help of VLAN Select feature we can map multiple VLANs to a single SSID using interface groups.
--> Wireless Controller uses round robin algorithm to assign IP Address to the clients.
--> This means the client will get same IP Address whenever it is associated/disassociated to the wireless controller.
--> This means we need very large subnet to be allocated to the users in auditorium or stadium.
--> The only way to solve this problem is to create multiple SSIDs with different vlan. This is not a popular option across the customers as there is no consistency between SSID and VLAN.
--> With the help of VLAN Select feature we can map multiple VLANs to a single SSID using interface groups.
--> Wireless Controller uses round robin algorithm to assign IP Address to the clients.
--> This means the client will get same IP Address whenever it is associated/disassociated to the wireless controller.
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