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The third approach, used by Meru Networks, is to rely on a design rule of thumb. Rather than performing a

predictive design or a site survey, Meru recommends that an enterprise install APs every 60 to 75 feet. The Meru

architecture uses the same channel throughout a coverage area and relies on the controller to avoid co-channel

interference. Therefore, AP spacing is primarily driven by the need to provide complete coverage rather than by

the need to minimize co-channel interference.

Some vendors may skew a network design in order to produce a BOM with the lowest cost in order to win a deal.

Then, after winning the deal, the vendor installs more APs and wiring than originally listed in the BOM. At this

point, it is difficult for an enterprise to change direction and award the deal to a different vendor. Enterprises

should require vendors to document their proposed BOM and to pay for any extra wiring and APs that are not

itemized in the original BOM.

For most vendors, the process of network design is disconnected from that of network management. Some

vendors can import the predictive design file into the network-management system. However, aside from

Enterasys Networks, none of the vendors automates the task of reconciling the predictive design with the as-built

network. Therefore, network administrators must manually move APs around the floor plan in the network-

management system in order to ensure that the AP location on a floor-plan map accurately reflects the actual

location in the network. Vendors must continue to simplify the process of network design and provide better tools

to help network administrators reconcile the differences between the network design and the as-built

implementation.

As the price of an 802.11n AP decreases, and as the level of self-optimizing WLAN functionality increases, we

are likely to see enterprises spend less time and money on the network-design process. Instead, enterprises will

increasingly use design rules of thumb—to simplify the design process—and rely on the network equipment to

dynamically self-adjust to the nuances of RF propagation.

Network Management

Nowhere is product differentiation more evident than with a vendor's network-management system. Management

products that enable a network administrator to browse the network by simply scrolling through a list of devices

are best targeted at smaller, less-complex networks. Management products that enable a network administrator to

hierarchically navigate many sites across the world are best targeted at larger, more complex networks.

Virtually all vendors support auto-power assignment and auto-channel assignment. Many vendors also support

AP load balancing and band steering. All vendors provide a method of provisioning guest access with and without

Wi-Fi Protected Access 2 (WPA2) security. Every enterprise should consider these features as baseline

requirements. Ruckus Wireless and Aerohive Networks, in particular, have elegant methods for generating unique

pre-shared keys (PSKs) for every guest. This feature enables an enterprise to uniquely encrypt the traffic for every

guest without the need to deploy 802.1X infrastructure or to configure the guest's wireless supplicant. Refer to the

Methodologies and Best Practices document “Securing WLANs in the Enterprise” for more information regarding

wireless security.

The fundamental enterprise challenge to managing a robust, reliable WLAN is controlling the underlying radio

signals. Unfortunately, radio signals are difficult to control, easy to disturb, and impossible to see. Wireless

vendors have developed a variety of solutions that attempt to improve network performance by mitigating

interference, improving the signal-to-noise ratio (SNR), and maintaining fair access to the WLAN.

Most vendors support some type of airtime fairness (ATF) mechanism. In particular, the Aerohive service-level

assurance (SLA) feature is innovative because the ATF engine automatically re-allocates airtime in order to bring

stations back into SLA compliance. WLAN vendors should implement more of this type of self-calibration

functionality. Every enterprise should include ATF in its request for information (RFI) documents. Although the

ATF features will interoperate with any Wi-Fi Alliance (WFA)-certified station, the mechanisms are non-

standard, and therefore, results will vary from vendor to vendor. Enterprises will need to shoulder the

responsibility of testing the ATF solutions to make certain they satisfy enterprise requirements.

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