Controllerless Networks

Reply
Contributor II
Posts: 59
Registered: ‎08-21-2014

Mass client drops at a school site

[ Edited ]

I was hoping to pick some brains out there on where to begin trouble shooting a problem I am facing with clients dropping suddenly on our Aruba Instant 225 deployment at a school site.

 

For reference here is our setup:

-Airwave 8.0.10  - located at Datacenter at District Office

-Instant IAP 225s running firmware 6.4.2.6-4.1.1.11_52666 - located at a school site connected over WAN

-We have 44 IAPs deployed on this campus. One in every classroom.

-We are using a full deployment of Aruba MAS 2500/3500 switches and an Alcatel Lucent OS6900 Fiber router on the site.

-Mix of client devices, but primarily Acer netbooks running Ubermix (Ubuntu mod). Roughly 600 deployed on the campus.

 

Our problem:

We recently noticed that 90-100% of our clients are showing as dropping connection a few times a day. We have heard complaints from a couple of teachers that they are seeing the laptops drop their connections. I have attached an image of the "Clients graph" from airwave for this school site.

client drops.PNG

 

What I know:

-We have 23 school sites with full Aruba deployment and this is the only one showing these kinds of client drops.

-The uptime of the Access Points is 12hours + (as seen in the image) and so there is no suggestion that the AP's are rebooting for any reason.

-We are not losing packets to any of switches/routers out at the school site, so we are confident this is not a network outage scenario or flapping issue.

-There hasn't been any pattern or common factor, that we can identify, as to why the clients are dropping.

 

Anyways, I'm not entirely comfortable with Airwave and was hoping someone could point me in a good starting direction for finding the root cause of these MASS drops.

 

Thanks for any insight you can give!

 

 

 

Guru Elite
Posts: 21,487
Registered: ‎03-29-2007

Re: Mass client drops at a school site

In the SSID profiles, under Advanced, do you have Broadcast Filter ARP enabled?

 



Colin Joseph
Aruba Customer Engineering

Looking for an Answer? Search the Community Knowledge Base Here: Community Knowledge Base

Contributor II
Posts: 59
Registered: ‎08-21-2014

Re: Mass client drops at a school site

Broadcast filter is set to 'Disabled.'

wlan ssid-profile PBVUSD-PSK
 enable
 index 2
 type employee
 essid PBVUSD-PSK
 wpa-passphrase 82895e8f696905660370fe24536864050c2eac882b1370d2
 opmode wpa2-psk-aes
 max-authentication-failures 0
 vlan 20
 rf-band all
 captive-portal disable
 hide-ssid
 dtim-period 1
 inactivity-timeout 86400
 broadcast-filter none
 dmo-channel-utilization-threshold 90
 local-probe-req-thresh 0
 max-clients-threshold 64
Guru Elite
Posts: 21,487
Registered: ‎03-29-2007

Re: Mass client drops at a school site

I would try setting that to ARP....on ALL your SSIDs.   Random broadcasts from clients is exactly that, random, so the client mix at that location might be more prone to broadcasts or you have a single client sending out sustained broadcasts which destroys wireless traffic.  If you have your wireless clients also sharing a Vlan with wired clients, those wired clients send out broadcasts at line rate and punish your client traffic.  Try setting broadcast filter to ARP and see if it continues.

 



Colin Joseph
Aruba Customer Engineering

Looking for an Answer? Search the Community Knowledge Base Here: Community Knowledge Base

Contributor II
Posts: 59
Registered: ‎08-21-2014

Re: Mass client drops at a school site

I will give that a try and let you know how it goes! Thank you for the detailed response :-)

Contributor II
Posts: 59
Registered: ‎08-21-2014

Re: Mass client drops at a school site

Unfortunately, we still saw a complete drop at about 11:00pm last night.

Capture.PNG

 

We do have a very vague error message on our controller though.

18:64:72:c9:aa:92# show ver
Aruba Operating System Software.
ArubaOS (MODEL: 225), Version 6.4.2.6-4.1.1.11
Website: http://www.arubanetworks.com
Copyright (c) 2002-2015, Aruba Networks, Inc.
Compiled on 2015-11-22 at 16:41:06 PST (build 52666) by p4build

AP uptime is 9 hours 5 minutes 44 seconds
Reboot Time and Cause: Reboot caused by kernel panic: Fatal exception in interrupt
18:64:72:c9:aa:92# 

Is this something I need to pursue further through support or is there a known cause for this error message?

 

MVP
Posts: 1,414
Registered: ‎11-30-2011

Re: Mass client drops at a school site

[ Edited ]

that error is to general for some to say what happened. to me it seems your network or at least parts of it just randomly crash / reboot. i would contact TAC asap.

Contributor II
Posts: 59
Registered: ‎08-21-2014

Re: Mass client drops at a school site

Just as an update, TAC was unable to help and our IAPs continue to randomly reboot. 

TAC forwarded the issue onto engineering on Monday and we have not heard anything.

Guru Elite
Posts: 21,487
Registered: ‎03-29-2007

Re: Mass client drops at a school site

What is the TAC ticket #?



Colin Joseph
Aruba Customer Engineering

Looking for an Answer? Search the Community Knowledge Base Here: Community Knowledge Base

Contributor II
Posts: 59
Registered: ‎08-21-2014

Re: Mass client drops at a school site

Case number: 1825652

Search Airheads
Showing results for 
Search instead for 
Did you mean: