Very High Density Wireless LAN Demonstration for BYOD: #1

Uploaded by merunetworks on 22.06.2010

On June 13th, 2010 we ran a very high-density wireless LAN experiment at Meru Networks.
What I'm going to share with you now is the parameters of this setup. In the test, our
goal was to create a very high-density environment where we wanted to approach one wireless device
per square foot. So we used a space of 500 square feet. Within that we packed 500 Wi-Fi
clients which was a mix of 802.11g, a and n. And in the 802.11n clients, we had a mix
of 2.4 only clients and dual-band 2.4 and 5 gigahertz capable clients. And we had 500
of these packed in an area of 500 square feet. In addition to this, we had 45 devices doing
multicast video streaming and we had 20 phones that were constantly doing phone calls. And
of course, the total mix of these 500 clients was a mix of laptops, net books, iPads, iPhones,
iTouch's, Blackberry, Nokia phones, Ascom phones and a variety of other devices. And
in addition to all of these sort of real applications, if you will, we also induced about 100 megabits
of end-to-end chariot traffic.
So when you think about this network, it is really an intense or extreme high-density
environment. Again, 500 square feet, 500 devices, 45 video streams, 20 simultaneous calls, 100
megabits of traffic. So, this was the environment. In other words, the end-user environment that
we just talked about. In terms of the wireless LAN infrastructure that was created to support
this application workload as well as the end-user workload, we had seven access points. These
were 802.11n access points, which were a mix of Meru's AP300, 320 and the 320i which are
dual-radio 802.11n access points with external antennas and internal antennas. Running our
production, System Direct Release 4.0 with all standard capabilities and all standard
features enabled.
As you might see from some of our companion videos, Meru is unique in its ability to do
what we call a single-channel architecture, wherein we are able to paint the entire floor
of coverage area with a single channel by means of having all the access points coordinate
to each other and present a virtualized wireless LAN to wireless devices. And what we do in
high-density environments is essentially leverage the single-channel concept so if you can paint
the floor with one channel, you can increase capacity by essentially layering more and
more channels. So what we did in this particular environment, to support this high-density,
was create four channels in the 5GHz range, and these were 40MHz wide, and three channels
in the 2.4GHz range and these were 20MHz wide. So we had a total of seven channels. We enabled
Virtual Port, which is a core Meru architectural construct that allows every advice to essentially
get its own virtualized access point in the network and see a view wherein every device
has sort of its access point that it carries wherever it goes in the network. This is how
we are able to support wireless-like wide-user experience and is a core principal of our
virtualized wireless LAN.
There's some companion videos that explain more of the technical detail. For the purpose
of this video, all I want to tell you is at the top-level, all our core features were
enabled. Channel layering was enabled, Virtual Port was enabled on all the channels. We also
enabled a feature called Band Steering, wherein dual-band devices were preferentially moved
to the 5GHz band so that we were able to evenly distribute the load across the bands. Then
we also enabled Load Balancing within the channels.
As you recall, Meru is unique in its ability to do channel layering, so within the channel
layers of a single band we are able to dynamically load-balance devices across all of these channels
so that, essentially, the goal is to get an even spread of devices between bands and within
a band, between all the channel layers. Since multicast was obviously a very key element
of our test, and multicast video is being coming more and more important in enterprise
networks, we enabled Meru's multicast group management capability which essentially does
optimizations in terms of figuring out how to direct multicast traffic to those devices
that have subscribed to multicast groups. And finally, in terms of the security mechanisms,
we enabled both WPA2-PSK as well as Clear. 75% of the clients were in WPA2-SPK, 25% of
the clients were in clear. So this was the wireless LAN setup.
Okay, so now we've talked about the end-user environment, the devices and we've talked
about the wireless LAN setup. So the following were the use cases that we show in this video.
The first one is all the clients are essentially accessing web pages at a 45 second refresh
time. So they're constantly refreshing and doing web access. This is essentially to create
background data traffic, ambient data traffic going on in the background, while we run 45
clients that are subscribed to a one megabit multicast stream. So this is adding an increment
of traffic over the air, multicast traffic that equates to 45 megabits per second. And
then we layered on top of that 20 phones that were making G711 client-to-client calls. And
on top of all of this, we added artificial workload which is essentially running a chariot
application generating a hundred megabits of traffic.
So the total summary is all devices accessing web pages at 45 second periodicities, 45 clients
subscribing to one megabit per second video streams, 20 phones doing 64Kbit/s G711 codec-based
phone calls, and an additional 100Mbps of end-to-end traffic. So this is what you're
going to see in the network, and what we want to show is obviously the quality, the density
and also in terms of web access, the response time. At the end of all of this, one of the
things we were really interested in was to understand how quickly clients could come
back into the network if in fact clients came in as a burst.
So what we did was we simultaneously rebooted all the access points and then allowed the
clients to come back into the network, and as you will see in the following clip in the
video, clients were able to come back very quickly and effectively re-establish the network
in a couple of minutes. Thank you and enjoy.