Wireless Access

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Occasional Contributor II
Posts: 17
Registered: ‎12-06-2012

Lots of Broadcast Traffic

We're sitting at about 45-65% broadcast frames here and wondering what might be wrong on the Wireless Side.

 

We have 3 SSIDs,

1) Domain machines - same vlan as our wired network

2) BYOD - VLAN #10

3) Guest - VLAN #11

 

I believe all areas where Broadcast Suppression are an option to be turned on, they are. In the VAP, in the Stateful Firewall, and in the IP section of the VLAN. Any thoughts would be appreciated!

Community Administrator
Posts: 2,254
Registered: ‎12-03-2013

Re: Lots of Broadcast Traffic

[ Edited ]

You can check and see which AP most of the traffic is coming from on the dashboard. This may or may not help you zero in on a solution.

 

If you can offer up a little more info or any info on applications you may be running we could better help you out.

 

Broadcast.PNG

 

 

 

CWNA, ACMP, Security +
Occasional Contributor II
Posts: 17
Registered: ‎12-06-2012

Re: Lots of Broadcast Traffic

Thanks for the suggestion. Checking it out, pretty much every AP has >70% of its Frame Type (to client) being the broadcast type.

Guru Elite
Posts: 21,010
Registered: ‎03-29-2007

Re: Lots of Broadcast Traffic

I would turn on broadcast filter all (drop broadcast and unknown multicast) on all of your virtual APS (all three), if you have not already.


Colin Joseph
Aruba Customer Engineering

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

Occasional Contributor II
Posts: 17
Registered: ‎12-06-2012

Re: Lots of Broadcast Traffic

cjoseph - They are all setup that way already. I did, as a test, take it off of all the APs the other day and the network was pretty much unusable (wireless-side)

Guru Elite
Posts: 21,010
Registered: ‎03-29-2007

Re: Lots of Broadcast Traffic

If there is little traffic, the majority of traffic would be broadcasts like the ap beacons. This is not typically a cause for worry.


Colin Joseph
Aruba Customer Engineering

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

Occasional Contributor II
Posts: 17
Registered: ‎12-06-2012

Re: Lots of Broadcast Traffic

There is not "little" traffic unfortunately. We have about 1200 clients connected at the moment. It seems like our performance is being hindered here. 

Guru Elite
Posts: 21,010
Registered: ‎03-29-2007

Re: Lots of Broadcast Traffic

You should be looking at the channel utilization, which is the best barometer of if your bandwidth is saturated or not...


Colin Joseph
Aruba Customer Engineering

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

Occasional Contributor II
Posts: 17
Registered: ‎12-06-2012

Re: Lots of Broadcast Traffic

No problem, here is a little sample of some of the data.

 

All of the below are 2.4Ghz - our 5Ghz doesnt have high utilization due to the minimal amounts of 5Ghz devices we currently have.

 

Checking into the "Channel Busy" list of 30-40%, the following APs:

38% usage - 92% Broadcast Frames

38% usage - 46% Broadcast Frames

30% usage - 21% Broadcast Frames

30% usage - 31% Broadcast Frames

 

40-50%

49% Usage - 50% Broadcast Frames

41% Usage - 18% Broadcast Frames

 

70-80%

77% Usage - <1% Frames (Currently have an assembly)

 

 

Is this what you are talking about?

 

Guru Elite
Posts: 21,010
Registered: ‎03-29-2007

Re: Lots of Broadcast Traffic

I am assuming that this on on the 2.4ghz band?  If so, there are two things you can do if you have high density:

 

- Make sure that the max-tx power for ARM on the 2.4ghz band is at 12 or below

- Remove some of the lower transmit rates on your SSID:  Please look at the article here:  http://community.arubanetworks.com/t5/Unified-Wired-Wireless-Access/Dramatic-utilization-reduction-in-2-4GHz-spectrum/m-p/92186/highlight/true#M2947

 

 

 

 



Colin Joseph
Aruba Customer Engineering

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

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