Good day Gentlemen and ladies.   I am running into a similar problem.  I did a high level network scan of all AP's, clients, and generally RF saturation for a College Campus environment.   We have many AP's.  Some of which are MR33's and a smattering of MR52's   Clients keep getting kicked off, or simply time out trying to authenticate.    It is quite un-usable for our clients, at least at times.   Here is what I found.   With the RF Scan, using Kismet, I found the APs being simply overwhelmed by requests to connect, and/or data volume issues.   This was easily demonstrated thusly.   One class, of Many BYOD's, including a mobile lab.  Machine/device count came out to about 42 devices, for a class of 16.   Our MR33, right outside the classroom door, was simply overwelmed.  I finally read the actual specifications of the MR33 and with the 2 Bands (+BLE), 2.4 and 5.2 Ghz.   Just not able to keep up with that many requests.   Even the traffic volume was huge.  > 1.2 Gb (or trying) over the single 1 Gb line (PoE)   I cannot see 16 clients, each receiving streaming video, to keep up.   Kismet confirmed this.  (Delays, simple drops, Interference (Quite a bit))   I had one extra port in the room.  Confirmed it was good to serve as an PoE AP line, and simply put in a second MR33.      That worked perfectly.  All clients, still slow, were connecting.   Further investigation and MR33/52 specs tells the story why.   So, for some of the other troublesome areas, I've put in a MR52, where the client experience has improved by leaps and bounds.   People are still having a little less issue connecting, but once they do, it's usually pretty good.  As long as they do not all stream at the same time.   That being said;  The MR33 has the 2 radios (2.4/5.2/BLE) the MR52 has 4 (2X2.4 2X5.2;  BLE ?)  and importantly, two trunkable ports.  (one of which is NOT PoE)   These MR33s and MR52's are a little older, do we have newer hardware to help out with this issue ?   I've noted that Meshing is NOT enabled, or responding at all.    I would love suggestions on that as well.   I hope that helps!         ... View more

Just a thought, back to the begininng of this thread.   Have you spoken to Cisco direct ? ... View more

Darn, not sure what to suggest.  The switches are not ? recognizing the SFP s ?   If not, First thing I'd do is try different ones.  (If you got)   I was a little lucky.  Had some old dlink media converters to test with.    That confirmed fiber.  (Mind you, techs with good eyes might even see the light - grin)   The only other thing I could suggest, is try the SFP's in other switches. ... View more

Morning All!   K, here was my issue (Fibre backwards).  I put another 1 Gb SFP on different switches in the same area.  (Another switch in each stack)   I know the 1 Gb work, because I was using them for imaging.   I finally tore a SC connector apart (Very easy) and swapped fibres.  Came right up.  At least at  1 Gb   I must have had only one crossover, and must have used it on the 10Gb trunks that work.   If you wish to duplicate, (Move fibre) do so gently.  Watch your optics.   I hope that helps others. ... View more

Thanks for the Fibre idea.   The 10 Gb Fibre had lit up the week before.   I confirmed the Fibre backbone about a week prior.  I wasn't ready to use it yet, and the switches were still configured OK, so I simply shut one of the ports off (Dis-abled)   Week later, confirmed the fibre again with the media converter, put all cables where I wanted them, and hooked up.  No link.   I did read swap fibres, which I haven't done.  I was going to go in the management port to take a close look at the port but could not get logged in the management side.   The run(s) themselves are < 100 meters.  Nice clean Corning Fiber shelves (6 pair a piece;  ALL tested fine) OM3;  Brand new patch SC-SC; Tested. etc.   Just odd, that it fired up fine, well a couple weeks ago, and now not.   ... View more

Curious if you found out what exactly the issue was.   I'm experiencing the same thing.  I have 2 of 3 10 Gb backbones in place.  One of the 10 Gb Fiber backbone will NOT connect.  SFP's have confirmed working (Moved both, over to the working backbone), fired right up.  Took the working backbone SFP's to needed link, of which will not start.   The dashboard sees the SFP's.  I've even confirmed the fiber using some old 100 Mb d-link media converters.   I had read sometimes you must Force those ports to 10 Gb, but that is not even an option.  I can do 1 Gb auto or 1 Gb Forced.   Anybody else having said similar issues ? ... View more