We are a balanced cluster, notes about load below:

"I’m also noticing that there are much fewer clients on this controller, and 
that ratio doesn’t seem to be improving."

To this point, the action we took that seemed to help the most was adjusting 
our active client load balancing threshold.  We dropped it significantly to 
force clients to balance across controllers.  Once we got below ~5000 active 
clients per controller, we stopped seeing the mass client connection issues.

We still have a controller that hasn't taken significant load, but now that 
we've been running without major issues for the past few days, we're reluctant 
to touch the setting again.
________________________________
From: The EDUCAUSE Wireless Issues Community Group Listserv 
<WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU> on behalf of Rob Harris 
<robert.har...@culinary.edu>
Sent: Thursday, September 2, 2021 10:59 AM
To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU <WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU>
Subject: Re: [WIRELESS-LAN] [External] Re: [WIRELESS-LAN] Anyone else seeing 
any issues in the fall with large classrooms and delayed connection times 
(Aruba 8.5.0.13)


For those of you who have experienced this, what was your user load and how 
were your clusters operating (balancing, active/standby) ?



I wonder if there’s a threshold..



Thx!



From: The EDUCAUSE Wireless Issues Community Group Listserv 
<WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU> On Behalf Of Smith, Nayef
Sent: Thursday, September 2, 2021 10:20 AM
To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
Subject: Re: [WIRELESS-LAN] [External] Re: [WIRELESS-LAN] Anyone else seeing 
any issues in the fall with large classrooms and delayed connection times 
(Aruba 8.5.0.13)







"I’m also noticing that there are much fewer clients on this controller, and 
that ratio doesn’t seem to be improving."



To this point, the action we took that seemed to help the most was adjusting 
our active client load balancing threshold.  We dropped it significantly to 
force clients to balance across controllers.  Once we got below ~5000 active 
clients per controller, we stopped seeing the mass client connection issues.



We still have a controller that hasn't taken significant load, but now that 
we've been running without major issues for the past few days, we're reluctant 
to touch the setting again.





Nayef Z. Smith | Network Services | Voice: 404-727-6019



[cid:image001.png@01D79FE9.A97E6BF0]


________________________________

From: The EDUCAUSE Wireless Issues Community Group Listserv 
<WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU>> 
on behalf of Davis, Jonathan Alan <jonath...@unc.edu<mailto:jonath...@unc.edu>>
Sent: Thursday, September 2, 2021 9:27 AM
To: 
WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU> 
<WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU>>
Subject: Re: [WIRELESS-LAN] [External] Re: [WIRELESS-LAN] Anyone else seeing 
any issues in the fall with large classrooms and delayed connection times 
(Aruba 8.5.0.13)



Lee, don’t you bring your bad Cisco-juju to this conversation! :-)



Now that Lee has been properly handled, this is probably a great opportunity to 
say ‘hello’ to the greater list.



Hello!



Last night, we (UNC) restarted the controller used to test the firewall policy. 
Despite Aruba’s advisory, we’ve been led to believe that restarting STM may not 
be enough, and restarting the whole controller may be required to resolve high 
STM CPU utilization.



This morning we are keeping a close eye on that controller. While STM is 
surging well past 100%, it seems to be averaging much closer to 95%.



However…

We also only have about 7,000 users connected across the cluster. It will be 
interesting to see what happens as the day progresses and students wake up and 
migrate from the ResNET cluster to the Campus cluster.

I’m also noticing that there are much fewer clients on this controller, and 
that ratio doesn’t seem to be improving.



I’ll update as we progress through this.



JD

--

Jonathan Davis

Wireless Architect

The University of North Carolina at Chapel Hill

jonath...@unc.edu<mailto:jonath...@unc.edu>

+1 336 279 3355 (Mobile)

________________________________

From: The EDUCAUSE Wireless Issues Community Group Listserv 
<WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU>> 
on behalf of Lee H Badman <lhbad...@syr.edu<mailto:lhbad...@syr.edu>>
Sent: Thursday, September 2, 2021 9:06:33 AM
To: 
WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU> 
<WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU>>
Subject: Re: [WIRELESS-LAN] [External] Re: [WIRELESS-LAN] Anyone else seeing 
any issues in the fall with large classrooms and delayed connection times 
(Aruba 8.5.0.13)



But you tested in your lab, right? I love that one… put new code on a couple of 
APs, or even a few dozen. That’s supposed to somehow indicate what will happen 
at bigger load… and also maybe implies the vendor didn’t do their own “similar 
lab testing”…

“You should have tested before upgrading the whole environment…” how do you 
REALLY do that? And should you really have to? Just pondering the general state 
of things.

> On Sep 2, 2021, at 08:59, Enfield, Chuck 
> <cae...@psu.edu<mailto:cae...@psu.edu>> wrote:
>
> That's been my experience for years.  The network works great when there are 
> no students around.  My working theory is that students emit RF interference, 
> but research ethics won’t let me run the tests, so we'll never know for sure.
>
> -----Original Message-----
> From: The EDUCAUSE Wireless Issues Community Group Listserv 
> <WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU>>
>  On Behalf Of Patrick McEvilly
> Sent: Thursday, September 2, 2021 8:56 AM
> To: 
> WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU>
> Subject: Re: [WIRELESS-LAN] [External] Re: [WIRELESS-LAN] Anyone else seeing 
> any issues in the fall with large classrooms and delayed connection times 
> (Aruba 8.5.0.13)
>
> Speaking from experience, I would be very concerned.  We had no issues until 
> students returned and we went downhill from there.
>
>
> On 9/2/21, 8:50 AM, "The EDUCAUSE Wireless Issues Community Group Listserv 
> on behalf of Rob Harris" <WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU on behalf of 
> robert.har...@culinary.edu<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU%20on%20behalf%20of%20robert.har...@culinary.edu>>
>  wrote:
>
>    Has anyone seen any details regarding what they consider "Large" 
> environments? We upgraded during the break, but both before and after 
> versions are affected. We didn't notice this happening before, should we be 
> concerned now?
>
>    The "dropped" is 0 and the stm cpu usage is in single digits, but client 
> count is really low (they come back this weekend as well), could we be in the 
> clear?
>
>    (asked the SE team and opened a tac call, same questions to them)
>
>    thx
>
>    -----Original Message-----
>    From: The EDUCAUSE Wireless Issues Community Group Listserv 
> <WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU>>
>  On Behalf Of Jason Healy
>    Sent: Thursday, September 2, 2021 8:45 AM
>    To: 
> WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU<mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU>
>    Subject: Re: [WIRELESS-LAN] [External] Re: [WIRELESS-LAN] Anyone else 
> seeing any issues in the fall with large classrooms and delayed connection 
> times (Aruba 8.5.0.13)
>
>    CAUTION: This email originated from outside The Culinary Institute of 
> America. Do not click links or open attachments unless you recognize the 
> sender and know the content is safe.
>
>    FWIW, Aruba just posted an advisory regarding this issue:
>
>    Aruba Support Advisory ARUBA-SA-20210901-PLVL04, "Wi-Fi Client 
> Connectivity Failures in Large Client Environments"
>
>    Good luck to those of you hit by this. My students start coming back this 
> weekend so I'll be watching this closely!
>
>    Jason
>    **********
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