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Frequent Contributor II
Posts: 123
Registered: ‎03-04-2011

AP-93h and Mode Aware

Hi,

 

In one of our dorms, we've installed an AP-93h, for every two rooms, totalling 40. So two rooms (4 students) would be sharing an access point. 

 

Currently, each AP-93h radio is set to 2.4GHz being that the unit has only a single radio. I'd love for those students who have 5GHz-capable devices to be able to access that band whenever possible. If I turn on the Mode-Aware feature, will the controller switch some of the APs to 5GHz? The manual is vague on this topic.

 

Thanks for the help.

Guru Elite
Posts: 20,820
Registered: ‎03-29-2007

Re: AP-93h and Mode Aware

Mode-Aware only Turns off Radios when there is too much coverage.  It does not change bands on a single-radio AP, no.

 



Colin Joseph
Aruba Customer Engineering

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Frequent Contributor II
Posts: 123
Registered: ‎03-04-2011

Re: AP-93h and Mode Aware

So there's no way of dynamically switching the radio's band depending on need?

Guru Elite
Posts: 20,820
Registered: ‎03-29-2007

Re: AP-93h and Mode Aware

There is no way of doing that.  Can we assume that if a user is 5ghz capable, he is also 2.4ghz capable?

 



Colin Joseph
Aruba Customer Engineering

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

Frequent Contributor II
Posts: 123
Registered: ‎03-04-2011

Re: AP-93h and Mode Aware

yes definately.  I was just wondering on how we can get our dorm to have both bands available, as needed with the 93h.

Guru Elite
Posts: 20,820
Registered: ‎03-29-2007

Re: AP-93h and Mode Aware

I would advise you that if you have 4 students using 1 2.4ghz radio, you should be good.

 



Colin Joseph
Aruba Customer Engineering

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Occasional Contributor II
Posts: 20
Registered: ‎01-10-2012

Re: AP-93h and Mode Aware

I have not tried this myself but I will be testing out 93h for use in dorm rooms in January,  the Aruba user guide does indicate that ARM and modeaware can switch the ap from 2.4gz to 5ghz if it doesn't see available 2.4ghz channels but does see 5ghz ones as available.  So it wont look at the user device and pick the channel but it will put some of the APs onto 5ghz.

 

 

From the ArubaOS 6.1 user guide starting at the bottom of page 179.

 

""

Aruba recommends using the multi-band ARM assignment and Mode Aware ARM feature for single-radio
APs in networks with traffic in the 802.11a and 802.11g bands. This feature allows a single-radio AP to
180 | Adaptive Radio Management (ARM) ArubaOS 6.1 | User Guide
dynamically change its radio bands based on current coverage on the configured band. This feature is
enabled via the AP's ARM profile.
When you first provision a single-radio AP, it initially operates in the radio band specified in its AP system
profile. If the AP finds adequate coverage on multiple channels in its current band of operation, the modeaware
feature allows the AP to temporarily turn itself off and become an AP Air Monitor (APM). In AP
Monitor mode, the AP scans all channels across both bands to verify that each channel meets or exceeds its
required level of acceptable radio coverage (as defined by the in the ARM profile).
If the AP Monitor detects that a channel on the 802.11g band does not have adequate radio coverage, it will
convert back to an AP on that 802.11 channel. If the 802.11g band is adequately covered, the AP Monitor will
next check the 802.11a band. If a channel on the 802.11a band lacks coverage, the AP Monitor will convert
back to an AP on that 802.11a channel.

 

""

Guru Elite
Posts: 20,820
Registered: ‎03-29-2007

Re: AP-93h and Mode Aware

[ Edited ]

mverlis wrote:

I have not tried this myself but I will be testing out 93h for use in dorm rooms in January,  the Aruba user guide does indicate that ARM and modeaware can switch the ap from 2.4gz to 5ghz if it doesn't see available 2.4ghz channels but does see 5ghz ones as available.  So it wont look at the user device and pick the channel but it will put some of the APs onto 5ghz.

 

 

From the ArubaOS 6.1 user guide starting at the bottom of page 179.

 

""

Aruba recommends using the multi-band ARM assignment and Mode Aware ARM feature for single-radio
APs in networks with traffic in the 802.11a and 802.11g bands. This feature allows a single-radio AP to
180 | Adaptive Radio Management (ARM) ArubaOS 6.1 | User Guide
dynamically change its radio bands based on current coverage on the configured band. This feature is
enabled via the AP's ARM profile.
When you first provision a single-radio AP, it initially operates in the radio band specified in its AP system
profile. If the AP finds adequate coverage on multiple channels in its current band of operation, the modeaware
feature allows the AP to temporarily turn itself off and become an AP Air Monitor (APM). In AP
Monitor mode, the AP scans all channels across both bands to verify that each channel meets or exceeds its
required level of acceptable radio coverage (as defined by the in the ARM profile).
If the AP Monitor detects that a channel on the 802.11g band does not have adequate radio coverage, it will
convert back to an AP on that 802.11 channel. If the 802.11g band is adequately covered, the AP Monitor will
next check the 802.11a band. If a channel on the 802.11a band lacks coverage, the AP Monitor will convert
back to an AP on that 802.11a channel.

 

""


Yes.  All of that is true and correct.

 

The one thing that it does not do, and this was Derbystar's question, is sense if a device supports 802.11a and changes to that channel.  All AP93Hs start on the 2.4ghz band.  If it does not sense there is too much coverage, it will never leave it.  You also do not want to worry about it changing to 5ghz and blackholing your 2.4ghz devices, so I would NOT enable ARM Mode Aware on a single radio device.



Colin Joseph
Aruba Customer Engineering

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

Frequent Contributor II
Posts: 123
Registered: ‎03-04-2011

Re: AP-93h and Mode Aware

According to the manual, the AP will switch from 2.4 to 5 if it determines that the 2.4 band is congested? Am I understanding this correctly?

Guru Elite
Posts: 20,820
Registered: ‎03-29-2007

Re: AP-93h and Mode Aware


derbystar16 wrote:

According to the manual, the AP will switch from 2.4 to 5 if it determines that the 2.4 band is congested? Am I understanding this correctly?


No.  If too many of your access points are broadcasting your networks on the 2.4 it will switch. It is designed to remove some access points from the equation when you have way jtoo much coverage.  It does not work well with a single band AP, because it does not factor in the bands of  the clients that are in the area.  I would go as far as to say it should not be used in a single band AP deployment because the algorithm requires a bit of fine tuning and that is not the environment that it was intended to deal with specifically.



Colin Joseph
Aruba Customer Engineering

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

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