Integrated Spectrum Analysis: State of the Market

Integrated Spectrum Analysis: State of the Market

By CWNP On 02/22/2011 - 45 Comments

I wrote a while back about Cisco CleanAir and the strong lead they took in the integrated spectrum analysis trend by incorporating logic gates from the Cognio chip. Aruba met CleanAir with a barrage of press touting their own integrated spectrum analysis, and Aruba is clearly the strongest competitor to Cisco in this arena. Meraki is the third vendor to announce the same feature, though theirs reflects the development of a smaller company playing largely in the mid-market where Cisco and Aruba are the heavy hitters out for the enterprise. CleanAir struck a chord in the industry and there is plenty of information out there about their products. Regarding Cisco’s current, and future, competitors, here are a few things to know.

We all know that almost everyone else in the market uses Atheros chipsets. So, let’s focus there.
Atheros 9300 (3x3) chips are used in most of today’s high-end enterprise APs. However, these APs are reportedly not recommended by Atheros for spectrum analysis due to bugs (or development shortcomings) in low-level code. They would rather push forward on development efforts with 3x3:3 chips, which are coming soon, than fix problems in current 3x3:2 products. In the meantime, you’re out of luck if you bought 9300-based APs and expected full support of spectrum analysis. For example, Aruba’s 124 and 125 APs use this chipset and don’t support the full spectrum analysis feature set. Most painfully, the missing features (as implemented by Aruba) include real-time FFT, duty cycle, and swept spectrogram charts.

This is important because one of Aruba’s initial marketing tactics was to downplay Cisco CleanAir based on the fact that it required a forklift upgrade, while claiming that Aruba’s features are software additions to existing hardware. It is definitely true that Cisco CleanAir requires CleanAir APs and a hardware replacement strategy is necessary (unless you want to provide an overlay), but it is important to differentiate that if you have already deployed Aruba 124s or 125s, you don’t get as much from the software upgrade. I don’t say that to knock Aruba (well, I guess a little, given their marketing). It’s really meant as a fair forewarning to users to read the fine print.

Atheros 9200 (2x2) chips are more common in competitively priced enterprise and SMB APs. These chips reportedly do not have same spectrum analysis limitations as the 9300 chips, making a unique situation for vendors who only use/sell 2x2 chips in their APs (that is, Meraki). Customers who’ve purchased and deployed this type of AP (from Meraki or Aruba) should be happy to know that the full feature set is supported by the hardware. The vendor-provided software is still needed to tease out the feature set, but the support is there today.

I read an opinion recently that integrated spectrum analysis will become commonplace in 2011. I’m having a hard time seeing it. Better software support from Atheros in 2011 (in next-gen 3x3:3 chips) will lead to a lot of good vendor software development this year, but with only one fully developed (sorry Meraki) example of Atheros-based spectrum analysis (and that only for 2x2 APs) to-date, I will bet on real proliferation and mass adoption sometime in 2012 and later.

Motorola probably has a jump on software development after buying AirDefense, who had some limited spectrum data from older 11a/b/g hardware; but, they’ve been heavily focused on architecture lately—though still no v5.x code to show. I predict they’ll be next to join the likes of Cisco and Aruba, especially given Motorola’s classic RF-laden industrial-environment stomping grounds.
Disagreements, agreements, input, complaints, additional data? Please do share!

Tagged with: aruba, Cisco, CleanAir, spectrum analysis, Meraki, Atheros

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02/25/2011 at 08:24am
The Cisco overlay model requires that the 3500s be set to monitor mode - thus the only thing they do is sniff and measure air quality. In this model the non-CleanAir APs are the only ones serving clients.

Scott Stapleton Says:
02/25/2011 at 06:10am
There should be little difference moving from the 1140s to the 3500s as the only major feature is the Spectrum Analysis on the 3500s. Certainly, I can't see this affecting clients roaming... and well, if you've thrown in 1140s and 3500s, you should be binning the 1240s ;)
The other reason mixing 1140s and 3500s is not recommended (given by Cisco), is that admin's may misinterprit the results as without a large majority of 3500s, you are not seeing the full environment. All this tells me is that mixing is fine, but you need to know what you are doing ;)

02/23/2011 at 15:13pm
"(I understand Cisco doesn’t support mixing CleanAir with non-CleanAir APs).”
"This is not the case. They can do an overlay model as well."

Marcus is correct that you can run them together but Cisco will tell you not to use the EDRRM feature on the WLC if your controller is supporting both clean air and non clean air APs.
So as I understand and have been told by Cisco AS, yes you can deploy the 3500 series APs alongside older models such as the 1242 or 1140s. I can not speak to how well your WLAN would perform shifting from all the different model types, but the controller won't stop the two different AP types from joining it and serving clients.

02/23/2011 at 10:58am
All three vendors support an overlay model, but the majority of customers do not prefer mounting all these sensor APs without them serving clients. The whole point is to be able to serve clients and perform spectrum analysis simultaneously, which i believe only Cisco can do that as it has a dedicated hardware in the 3500 APs to do just that.
One other important element is the ability to "proactively" mitigate against those non-WiFi interferers. Otherwise, customers will only benefit from paying those spectrum analysis licenses when people in a room complain about the wireless experience so much that they call IT and have them turn the AP into spectrum mode (disconnecting all clients connected to that AP) to see if there are interferers.
So i guess as long as vendors try to rely on Atheros WiFi chipsets to do the job of signal analysis, we may not get there.

02/22/2011 at 22:07pm
"(I understand Cisco doesn’t support mixing CleanAir with non-CleanAir APs)."
This is not the case. They can do an overlay model as well.

02/22/2011 at 21:56pm
Ben, any elaboration? I see the point that the client location matters, but why is it necessarily better than the AP's location/perspective?
Bob, that is a set of questions for which I should charge a lot of money to answer. :) Generally speaking, I'd say yes, they do the same things. I don't have as much hands-on with Aruba's solution, but both solutions go beyond troubleshooting and definitely step into the territory of automated response. The best solutions to RF interference will almost always require human intervention, but temporary solutions that maximize availability for all client stations are also very important. Making short-term optimization decisions are automated. RF visibility aids this process by providing a more holistic assessment of what is happening on the medium. L1 and L2 performance are critical.
Can other vendors surpass what is offered by Cisco? Sure, Cisco isn't perfect. However, if any vendor surpasses Cisco capability it will do so with software enhancements, which will take a lot of time and engineering cycles. Atheros' spectrum hardware is no better than Cisco's. In fact, my guess is that at least for the short-term, Cisco still has the edge in both software and hardware by virtue of a more mature product.
Wilddev, I understand those points. There are some slight performance advantages to 3x3, but with a steep price difference, I agree that they may not be worth the cost for many environments. Pair that with better spectrum feature support and it is a no-brainer. Sucks for Aruba that the sales pitch has to be temporarily trimmed to favor the lower cost AP. :)
I'm not sure I understand the comment about mixed CleanAir and non-CleanAir. They don't recommend running them in the same environment, but I'm not aware of any limitation that doesn't allow them both to co-exist, even on the same WLC.

Chris Lyttle Says:
02/22/2011 at 21:09pm
Marcus, The AP-124/5 are now an older AP for Aruba, we tend to sell way more of the Atheros AP-105 (which have the 9200 chipset) and they make a more suitable AP for this purpose (and cheaper too). Honestly although I agree with your analysis about the shortcoming of support for spectrum analysis for these APs, I really wouldn't recommend them even before I read what you said above simply because why use a higher priced 3x3 AP for an application that doesn't need high performance when there is a cheaper alternative? When I am designing a network for high performance with Aruba I would tend to use the 124/5 for client access and then use the 105 for WIPS and Spectrum Analysis. This means an overlay for them (which I tend to recommend anyway) for monitoring and I think makes more sense than using the older AP-124/5. I would also point out that the 105 is a way cheaper solution than the Cisco CleanAir solution and additionally doesn't require the customer to rip out all of their APs to get spectrum analysis (I understand Cisco doesn't support mixing CleanAir with non-CleanAir APs).

02/22/2011 at 18:02pm
This is helpful, Marcus. It's getting really hard to cut through the marketing hype these days. Can you provide any other insights on what makes the available solutions/approaches different? Do they do the same things? Are they just tools for troubleshooting interference or can they provide some level of automation? Are you saying Aruba and Moto both have the potential to meet or exceed Cisco's approach using the Atheros chipsets?

02/22/2011 at 14:28pm
The problem I see with all of these is that they show you spectrum at the AP rather than the station.

02/22/2011 at 12:01pm
[...] This post was mentioned on Twitter by Jennifer Huber, Juan Carlos Basurto and John Yrigoyen, Marcus Burton. Marcus Burton said: New CWNP blog post. Some info about today's Atheros-based integrated spectrum analysis. [...]

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