Hi guys, felt I had to share this:

anyone wondered why WLC uses 104 bits
and Autonomous uses 128 bits ?

Well I have and it´s been bugging me in
the background cause I didn´t know why this
difference was, even though stuff was working
as expected with same passwords e.t.c.

But glazing through this TAC collection is both
fun and gives you some flashbacks to stuff that
one has experienced in the past. I am for sure
going to explore this option some more and read
more from that collection.

So this gave me the explaination:

Solution #
K23942005
Title
User receives the "128bit isn't supported on the Access point" error 
message during the configuration of the WEP on the WLC
Core Issue
This error message appears when 128-bit encryption is used in place of the 
104-bit encryption.
Resolution
This 128bit isn't supported on the Access point error message is seen on 
controllers when the key lengths shown are actually the number of bits that are 
in the shared secret and do not include the 24-bits of the IV. Many products, 
which includes the Aironet products, mention a 128-bit WEP key when in reality, 
it is a 104-bit key with 24-bit IV. On the controller, the key size of 104-bit 
is 128-bit.  The 128-bit key size on the controller is actually a 152-bit key. 
So in order to set the 128-bit key, set with the 104-bit.

Pasted from <https://www.ciscotaccc.com/kaidara-advisor/SearchflowRes.do>
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