Aruba's test results achieved 830 Mbps on a dual stream laptop, and 240 Mbps on a single stream smart phone.
The fastest 802.11ac rates drop down to 802.11n speeds at 50 ft from the access point. Maintaining this desired distance from the access point is how you can deliver the capacity of 802.11ac to mobile client devices.
The advancements that Aruba has made in ClientMatch allows this technology to work at several different layers of the OSI protocol stack.
- ClientMatch (L1) for link optimization moves clients to APs that have better signal strengths for them to connect to. Simply link optimization for client devices.
- ClientMatch (L2-L3) for traffic optimization takes AP load into consideration when moving clients to other APs. Uses signal strength and load of the AP.
ClientMatch for App Optimization (L4-L7) is a version of SDN to optimize the WLAN to the client/app information.
The client testing Aruba has performed uncovered that the Android software version 2.3 roams notoriously badly.
ClientMatch has device type identification built into it and helps ClientMatch make moving decisions. ClientMatch will stop steering clients for 2 months at a time to stop causing problems with a client device that doesn't want to roam. Aruba is optimizing the bottom 20% of the network instead of the top performing devices that could be improved a small percentage more.
VisualRF now shows the health of the client by the colored circle shown around the client device. Visual RF now integrates with Lync API via a diagnostics API. The QoS for all Lync apps, call admission control and Wi-Fi call quality stats can be shown through Visual RF. Aruba Networks is the only Lync qualified wireless LAN.
The visibility into the diagnostics API of Lync is new. Soon Aruba will be able to tie in Lync diagnostic information into ClientMatch to make more intelligent decisions on client roaming based on Lync application data.
Future of wireless networks
- 2013+
- Mobile
- Personal LANs
- Software-centric
- L4-7 based
- Open architecture
Microsoft Lync over Wi-Fi with Pascal Menezes, Sr. Program Manager at Microsoft
Pascal presented the history of the partnership between Lync and Aruba Networks.
Lync is the enterprise version of Skype. Lync can be an instant messaging platform which can determine presence across Lync and Skype platforms.
Lync 2013 Mobile Client Features don't support viewing shared Lync content on anything other than an iPad or a Windows 8 or Windows RT OS. I found this interesting since it was the only features line without all the check boxes checked.
Microsoft started a Lync Wi-Fi Partner Program and Aruba was the first partner to work with them. The qualification program means Microsoft has done all the testing required to ensure interoperability with vendors' wifi networks. The Lync Network Diagnostic API is the forward looking portion towards Software Defined Networking (SDN) in wireless networks.
Aruba OS 6.1.3.2 and higher is the firmware version Lync tested.
The Lync/Aruba interoperability testing environment
- Two buildings were upgraded to support real-time media.
- Testing facility was B30 and B31 in Redmond. Each building has 600 Lync users.
- There are a total of 182 Aruba APs (about every 60 feet apart). Based on the trial results, MSIT is upgrading the entire global Wi-Fi infrastructure to 802.11n.
- Spent two years tweaking the wireless network.
- Signals -45Bm to -65dbn and snr better than 30db
- OKC enabled (no 802.11r) fast BSS transition support
- Enabled ARM
- WPA2 in enterprise mode
- Adjusted the DTIM timer to 3 for mobile devices to save on battery life
- The sticky clients they saw would hang at -90dbm and then roam to an AP with -60dbm.
- Client devices would experience seconds of audio outages during these roam times.
The rate adaption algorithms and TX retries may take up too much airtime in retries for UC real-time media traffic. Existing STAs rate adaption algorithms not well suited for UC.
The Microsoft Lync team has proposed for a Mobile Multimedia Over Wi-Fi WFA WG
Support of 18 Wi-Fi vendors. The goal of the proposal is to develop a certification that improves the Wi-Fi roaming and application performance in enterprise and public venues in a manner that is impelling for vendors. The ability to verify performance for real-time voice and video over Wi-Fi is the ultimate goal of this proposal, as QoS is difficult to deploy and is expensive and complex to manage. In most enterprise networks, QoS is not widely implemented end to end (from the wireless to the wired networks).
After the presentation from Pascal, we had our roundtable discussion about the Aruba announcement and our opinions on 802.11ac. We discussed sticky clients, antenna design of the Aruba 220 access point, the Lync diagnostic API and our wish for a portable tool which would allow wireless engineers to view the Lync diagnostic data without requiring a login to the Lync server.
Designing Wi-Fi for Voice & Video with Mike Kail, Netflix VP of IT
Mike D. Kail VP of IT Operations at Netflix described how 802.11ac affects their all-wireless office environment.
Netflix uses Wi-Fi for Voice and Video throughout their offices. Netflix has a 100% mobile office. This increases productivity to be able to work anywhere within wifi range. Some graphic designers have iMacs that are hardwired, but everyone else is wireless. The docking station may be used for Accounting people, but it's rare to be wired into the network. Netflix employees still have desk phones but most people use their cell phones. They are desk phone optional (internal recruiting team and the legal team probably use wired phones).
The ultimate goal of the Netflix network design is to achieve a Zero Trust Network
- Goal is no perimeter firewall 'gate'
- Identity is the new perimeter
- Moving all devices to EAP-TLS
- Evaluating ClearPass
- They use Google+ hangouts for collaboration
- Telepresence and Lifesize are used for video conferencing.
Netflix prioritizes multimedia on the same SSID as data and all Android and iOS devices are allowed, no exceptions. Netflix is beta testing Aruba's 802.11ac access points and evaluating Aruba RAPs for remote locations to extend corporate networks to home users.
Netflix Content Operations does the QC streaming testing of the UI across wifi networks. The Los Gatos campus is 5 buildings with 280 APs, and at any given time, there are 1300 - 1400 people accessing the Internet. Typical Netflix upload/download speeds are 199 Mbps down / 174 Mbps up.
Netflix employees can use any device, as they've implemented security to access to the data, not the access to the device.
Netflix had some original access point placement issues, some areas have multiple SSIDs and there are a few roaming problems that are problems on the client side. Overall, Netflix has one main SSID and a couple others that give them presence into other countries. The additional SSIDs are locked down to specific floors for testing.
Smart TVs and Apple TVs (due to the authentication method used [EAP-TLS]) are wired.
100% EAP-TLS, no captive portals, but there is an open guest network that uses ClearPass. Netflix is also looking to implement their own open source certificate framework. Netflix uses CACTI and MRTG to monitor their wireless network in conjunction with AirWave. Netflix is also active in Github and uses open source software whenever possible. Netflix is also working to implement NAC on the wired ports to form the Zero Trust Network.
Next-gen Access Network Design with Arun Kanchi, Exafort CEO
Arun Kanchi CEO of Exafort
Exafort is a Cloud and Mobile Systems Integrator
Mobility needs summarized in three words:
- Security
the security of corporate data
- Privacy
the personal privacy of workspace apps
- Experience
ease of use, self registration, content based access
Exafort manages the wireless infrastructure for Arista for site surveys, design and deployment as well as IT help desk as a service. Arista's IT infrastructure is 90% cloud based - Wi-Fi, tools, corporate business applications. Exafort has planned an AP deployment ratio of 75 access points to 1000 people. Exafort has planned a 100% redundant wireless LAN design. They've planned the access point placements so that there was bleed over between floors and this bleed through coverage would support users on that floor.
Exafort is pulling two cables to the APs, the additional expense is the physical cabling. They're not having to pull a new run. The second run is half the cost of the first run. The ports on the AP will only have one live at a time, but each access point is occupying two full switch ports. The new Arista building is going live in the fall of 2013 and will be the first wireless network for Arista. Exafort has been managing Arista's IT infrastructure since 2009.
Exafort used AirWave to do a predictive survey for the new building deployment. Exafort didn't use SNR or RSSI metrics within AirWave to design the predictive deployment, the used the coverage model to design so that all areas of the building were covered in signal strength shown in green in AirWave. Exafort is using a 20 MHz channel plan for 2.4GHz and 40 MHz for the 5 GHz, and they're relying on RRM to auto adjust the channels/and keep the noise floor low.
