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Occasional Contributor II
Posts: 18
Registered: ‎09-22-2014

how many virtual AP's is too many?

We are a K-12 system.  We have 7210 controllers running 6.5.0.3 with AP models 105, 114, 115, 214, 215, 224, and 225.  We do not use ClearPass.  Most AP's are in dense deployment (one in every classroom, roughly 50 feet apart).  I have 4 or 5 virtual AP's applied to a given AP group (depending on the site).  Each VAP has a separate SSID, appropriate aruba firewall rules for the type of client connecting, and puts them on VLANs with access to various resources within our network or routes them directly out to the internet.  I've gotten requests to add 2 more virtual AP's, and apply them to all AP groups.  I'm wondering at what point I would start to see performance issues.  I ran across a helpful Airheads post entitled "What is the effect of virtual access points on the available throughput?" which was helpful in understanding how / why having multiple VAP's can cause issues, but I wasn't really able to determine when it could become a problem for us in a real-world scenario.  What's your opinion?  How many VAP's do you think are too many in our kind of environment?

Guru Elite
Posts: 21,269
Registered: ‎03-29-2007

Re: how many virtual AP's is too many?

Stop right there.  The performance only gets worse.  How are the two other SSIDs different from the 5 others?



Colin Joseph
Aruba Customer Engineering

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Occasional Contributor I
Posts: 6
Registered: ‎09-06-2015

Re: how many virtual AP's is too many?

You should be using 802.1x and using that to dynamically assign VLAN's when possible.

Aruba
Posts: 1,644
Registered: ‎04-13-2009

Re: how many virtual AP's is too many?

Although you can have up to 16 BSSIDs on most Aruba APs, the Aruba products/solutions leave little reason to have more than 3 different SSIDs (Virtual APs) per AP.   The reason is because through authentication and firewall rules, you can typically keep networks to 1 per encryption type.  Open (Captive Portal), 802.1X, and WPA2-PSK..(to support non-dot1x devices).

 

You may have reason to have additional SSIDs (Virtual APs); but as a general guideline, the less you have the better.  Refer to the link you included as well as  and the "SSID Overhead Calculator" from revolution Wi-Fi to give you an idea of the impact of additional SSIDs/Virtual APs:  .

 

 

------------------------------------------------
Systems Engineer, Northeast USA
ACCX | ACDX | ACMX

Occasional Contributor II
Posts: 18
Registered: ‎09-22-2014

Re: how many virtual AP's is too many?

Thank you for the prompt and helpful responses.  The SSID calculator was rather eyebrow-raising.  I will begin to work towards 802.1x authentication for these devices and users.  My goal is to get down to two SSID's, and I think I can do it by using 802.1x authentication instead of having separate SSID's.

 

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