WLC 2504 Setup

Question

Presently, in my network, I have 3 SSIDs configured on my WLC. I have (and I know this is definitely not a BP) physically segmented these wireless networks using the available ports on the WLC.
I have a 2970G switch that is lying around that I figured I would put to good use here. I've attached a network diagram for what I am proposing to do and wanted to see if people thought this would work. Basically, if I have my WLC tagging all the traffic with the VLAN it belongs to, shouldn't the switch be able to handle sending it out the right port? Can I get away with this on an L2 switch or do I need an L3 switch?           

Answer 1

#with lag disabled, think of 2500 WLC as L2 switch but not the real switch where all vlans can be passed via multiple uplink trunks. in wlc, the vlan interface mapped to physical interface will also act as uplink for those vlans and no other physical interface on wlc can use it. With lag enabled all vlans are available on that bundled ports which is similar to the normal switch however wLC can't support two different bundle going out.
#WLCs are not multihomed switch that can do multiple uplinks via trunks, it is an edge device, it forwards wireless traffic received from AP via Management interface back to AP using the same management interface for wireless traffic and forwards/receives the wired packet via the appropriate physical port that has the vlan mappings and forwards to Management interface destined for wireless.
#on 2500, if lag not used, Either all interface is mapped to one physical port and use this port as uplink or can multiple vlan(s) per physical port and that physical port will act as uplink for those vlans, we cannot map one vlan to more than one primary interface(and an optional backup) physical interface on wlc.
#this setup works if you've 3 dynamic interface created vlan-14,45,21 and mapped to port 1 or each interface mapped to separate physical port, provided it require one on one trunk connection to the switch from wlc.
#on switch side configure trunk port to allow these vlans based on the physical connection.
#try lag, 2500 WLC support lag from 7.4.