Dense environment in a AP per classroom deployment issues and concerns.

  • 1
  • Question
  • Updated 3 years ago
Photo of Arison Mercado

Arison Mercado

  • 113 Posts
  • 8 Reply Likes

Posted 3 years ago

  • 1
Photo of Nick Lowe

Nick Lowe, Official Rep

  • 2491 Posts
  • 451 Reply Likes
Hi Arison,

I am not sure what you are asking here. Please can you elaborate about what your issues and concerns are?

I can say initially that if you have deployed with an AP per classroom it is likely that things have not been done optimally.

See the following link for a great explanation of this: http://www.wlanpros.com/one-ap-per-classroom-approach-wrong/

Cheers,

Nick
(Edited)
Photo of Arison Mercado

Arison Mercado

  • 113 Posts
  • 8 Reply Likes
Nick, 

My apologies but I posted the message wrong. I should have this updated shortly.
Photo of subietodd

subietodd

  • 6 Posts
  • 0 Reply Likes
It would be interesting to see the floor plans, wall construction material, and your proposed design along with a detailed question.
Photo of Arison Mercado

Arison Mercado

  • 113 Posts
  • 8 Reply Likes
Hi Aerohive,

Exactly one year ago I inherited an entire school district Aerohive deployment of around 575 AP’s. I’ve done the best I can to learn Aerohive and acquire help from support in order to perfect a Aerohive environment consisting of several SSID’s and flat networks. Long story short, I have made my wireless network a lot better from when it was given to me but they’re still a few things I need to fix and I’m hoping to have it done by the end of the school year.

So far all my K-8 schools have been doing significantly better but I have certain clients on Lenovo laptops that report they have Wireless connectivity but are not able to access anything on the LAN or internet. When tested you cannot ping the users device and the Client monitor doesn’t report any issues, because the HMOL believes it is still connected, and last but not least when I run a Speed test it reports more upload speeds vs. downloads speeds 75% of the time.

 

K-8 Notes config

With Area maps Channels 1,6,11 have been manually set accordingly.

 2.4 Ghz is “Administratively down” in every other classroom.

2.4 Ghz dBm power set to 3 and 5 Ghz dBm power set to 6

3 SSID’s

Guest (CWP) with Open SSID (DMZ network)

Internal with WPA2-Enterprise

Internal 2 with WPA personal devices non compatible

Radio Profile 2.4 mode: 802.11a/n/ac Urge clients to 5Ghz, Disable WIPS

Radio Profile 5 mode: 802.11a/n/ac Disable WIPS

 

 

 

Now the High school is a different beast, within this building they’re 220 AP’s which is extreme. Not only is there an AP per classroom but our hallways has an AP 50 feet from each other. Also this building has almost the same configuration as my k-8 with a couple of differences. The first thing is that this building is soo dense that I had to begin disabling the 5 GHz per radio band on every two classrooms. 2 this school is using 5 SSID's but I cannot convince my staff to minimize it to three. Reason they don’t want to reduce the number of SSID’s is because they’re highly concerned with security. Below is the listed SSID’s and there purposes.


Highschool Notes

SSID1: Guest (DMZ network)

SSID2: Internal devices WPA-Personal (non WPA-2 enterprise compatible)

SSID3: Internal users WPA-2 Enterprise  IP Multicast enabled

SSID4: Smartphone network that can connect to our VoIP (secured server network) + QoS profile

SSID5: Polycom Wireless Phones (Soon will merge with SSID4) + QoS profile

In addition: Lower Data Rates are disable on both radios and start on 12mbps Optional

Issues: Upload speed are higher than download speeds, Clients randomly lose connectivity without roaming and when it is viewed on client monitor, the device is only associating itself with the same AP it was connected to.


(Edited)
Photo of Crowdie

Crowdie, Champ

  • 972 Posts
  • 272 Reply Likes
3 and 6 dBm transmit powers are extremely low.  Are you sure this is not contributing to the issues?  If some of the wireless clients are smartphones and/or tablets from my experience dropping below an 11 dBm transmit power will cause you issues.
Photo of subietodd

subietodd

  • 6 Posts
  • 0 Reply Likes
Question...What is your lowest mandatory data rate? I would think that if you disabled the 6 and 9 data rates, then you would need to make 12 the mandatory data rate so that clients could associate to the AP. So what are your Mandatory and Supported and Disabled data rates?
Photo of subietodd

subietodd

  • 6 Posts
  • 0 Reply Likes
That is interesting. "Clients randomly lose connectivity without roaming and when it is viewed on client monitor, the device is only associating itself with the same AP it was connected to." It is almost as if the radios are not part of the same ESS and the client can't roam correctly. Have you debugged the roaming of a client?

What tools have you used to troubleshoot and measure these issues with? Have you completed a post-install validation survey? That might show you quite a bit of useful information concerning the RF and Channel Utilization and Co-Channel Interference. 

Interesting stuff today. Kept my mind off of the wifi troubles I am working on. :D
Photo of Nick Lowe

Nick Lowe, Official Rep

  • 2491 Posts
  • 451 Reply Likes
I think that's more likely to be related to buggy client drivers if these clients are using Intel's 7260... Arison, did you see that I had replied to your other thread?

I'd also be minded to try setting the 11 Mb/s rate to disabled, setting 12 Mb/s and 24 Mb/s to basic and setting 36 Mb/s to optional for the 2.4 GHz radios. (This will kill all 802.11b clients.)

12 Mb/s and 24 Mb/s to basic and 36 Mb/s to optional for the 5 GHz radios.
(Edited)
Photo of Arison Mercado

Arison Mercado

  • 113 Posts
  • 8 Reply Likes
@Nick Lowe I really don't need the 802.11b compatibility should I remove that from the radio profile? Also I saw your article you posted several months ago, in regards the AP per classroom implementation and I agree with it 100%, I'm just trying to fix the issue regardless to how many AP's I reconfigure to not broadcast. 

Also in regards the other thread, I'm aware you mention that there might be an issue with Wifi adapter but I have this issue occur with my very own MBP and other Lenovo laptops of a different model. In addition, I was recommended by your tech support team to run a packet capture with there instructions on wireshark and we could not determine why the laptops lose "network" connectivity while indicating it is online by reviewing the WiFi Connection on HMOL and the laptop itself. Also I'll update my configuration on the data rates to reflect your suggestion but please keep in mind my school district is looking for throughput and not coverage since they've overloaded each schools with Aerohive AP's.
(Edited)
Photo of Arison Mercado

Arison Mercado

  • 113 Posts
  • 8 Reply Likes
@subietodd I'm not familiar with debugging a client for troubleshooting. And as far as troubleshooting, I just followed Aerohive tech support instructions with wireshark and I did not get any good feedback from the capture. And all i've been doing is running ASCP commands on the AP CLI's. In additon, as far as a "Post Validation" survey, how would I go about that?
Photo of Arison Mercado

Arison Mercado

  • 113 Posts
  • 8 Reply Likes
Sorry @Nick Lowe to correct myself, I actually have 802.11b removed from the radio profile since we're not using it.


BTW hows this for data rates?
(Edited)