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Fast SSID Change - Out Of The Shadows

There are many configuration settings on a piece of networking kit that are just 'there'.

They sit there year after year just minding their own business being a quiet little chunk of configuration sitting in their default state not doing anyone any particular harm. Then, occaisionally, you come across some obscure case that causes you to actually pay attention to what exactly that particular setting is 'bringing to the party'.

One particular instance I came across recently is the 'Fast SSID Change' setting on a Cisco WLC.

From memory, it's been sat there for quite a while on many of the controllers I've installed, sitting dutifully in its default state of 'Disabled'. I've never really paid it much attention as it doesn't (on the face of it) seem to cause anyone any particular problems.

However, I recently ran in to a situation where a customer had some Apple iPads that he wanted to connect to an SSID that was mapped to an internal corpo…