Yo! Jake here.  Sorry it has taken me a bit to get back with you, its a bit 
crazy for me right now.

We have attempted to solve the same SSID + different VLan issue in two ways.  
The first way involved some custom code and a custom DB table.  Basically the 
way it worked was when a user authenticated on one of our Cisco LWAPPs the APs 
MAC would be found in the table and the associated VLan prefix would be 
appended to the VLan return value.

This worked well for a while but it proved to be a bit of a pain through 
upgrades since if the files I had customized (technically Inverse did most of 
the customizations, I just touched it up a bit due to changes through multiple 
upgrades) needed to be inspected and verified to work properly after a PF 
upgrade.

The last upgrade I did, I botched pretty badly (I thought I was on the dev box 
... turns out I was not ... oops) the net effect of which was I setup PF from 
scratch and imported the DB with all of my nodes, APs, etc from a backup ... 
but that also meant that I had to put back my customizations that made upgrades 
difficult. So I started looking for another way, and I found the way we are 
currently doing it now.

A strange quirk of the WLC is that you cannot have SSIDs with the same name. It 
was at this point I was stumped since I am not allowed to change the name of 
our SSID.  But then I found a very poorly documented feature of the WLC.  

You CAN have duplicate SSIDs so long as the WLAN ID is at least 18, after that 
you can duplicate SSID names as much as you like.

"WHAT?!", I hear you say.  

"Yes, indeed!", I say.

"But why 18? That seems arbitrary and foolish." You respond.

"Yes, yes it does." I sigh.

So, currently our setup is this.  A single SSID per building that is attached 
to the interface group for that building.  The WLC has an IP in the management 
VLan for the interface group so when it talks to PF it will use that IP.  All 
thats left is to add the necessary IPs to PF as independent switches and viola! 
it works with no custom code required and it is upgrade safe, YAY!

I can explain more fully if needed but this is the best way we have found yet.  
If anyone else out there has a better way I would be very interested in 
learning about it.

Jake Sallee
Godfather of Bandwidth
System Engineer
University of Mary Hardin-Baylor
WWW.UMHB.EDU

900 College St.
Belton, Texas
76513

Fone: 254-295-4658
Phax: 254-295-4221

________________________________________
From: forums [[email protected]]
Sent: Wednesday, December 03, 2014 11:12 AM
To: [email protected]
Subject: [PacketFence-users] Cisco WLC same SSID different vlans

I see that Jake back in 2012 had a thread "New Cisco WLC module?" and it
is the same issue I am running into.  I need to offer the same SSID
across the facility but need to use different vlans depending on which
building the user is in.

The WLC is running 7.6.130.0.  Under authentication I can have the Auth
Call Station ID type be the Ethernet mac of the AP, AP Name, AP Group,
AP Location, etc.  I can see the proper AP Ethernet mac address when I
watch the pf.log.

I was looking at using the AP Ethernet mac address, but AP location
would be better as it would involve a smaller database.  I am looking at
custom.pm but am not seeing a variable for the switch_mac that I could
use.

Am I overlooking something?  Has somebody else done this since 2012?

Thanks
Sean

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