WLC 2106 - What does a VLAN need an IP Address

Likely a rookie questions, but I'm assigning WLANs to VLANs on a 2106 WLC and when I create the VLAN I'm actually creating an interface that needs layer 3 parameters such as an IP address. Why is this, i.e. whey do I need to create a layer 3 interface vs. just creating a VLAN like I would have done on an autonomous AP?
thanks in advance,
Simon

The main purpose of the full ip address subnet and gateway information for each dynamic interface (vlan) is in order to:
1) Manage VLAN traffic.
2) Manage other communications between other controllers.
3) DHCP relay (WLCs interface will be like the proxy for all the wireless clients)
4) Other stuff, like anchor controllers, web authentication, etc..

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WLC 2106 - What does a VLAN need an IP Address

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