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Optimizing APs Over Low-Speed Links
Depending on your deployment scenario, you may have APs or remote APs that connect to a controller located
across low-speed (less than 1Mbps capacity) or high-latency (greater than 100ms) links.
With low-speed links, if heartbeat or keep alive packets are not received between the AP and controller during
the defined interval, APs may reboot causing clients to re-associate. You can adjust the bootstrap threshold
and prioritize AP heartbeats to optimize these types of links. In addition, high bandwidth applications may
saturate low-speed links. For example, if you have tunnel-mode SSIDs, use them with low-bandwidth
applications such as barcode scanning, small database lookups, and Telnet to avoid saturating the link. If you
have traffic that will remain local, deploying remote APs and configuring SSIDs as bridge-mode SSIDs can also
prevent link saturation.
With high-latency links, consider the amount and type of client devices accessing the links. Dell APs locally
process 802.11 probe-requests and probe-responses, but the 802.11 association process requires interaction
with the controller.
When deploying APs across low-speed or high-latency links, The following best practices are recommended:
l Connect APs and controllers over a link with a capacity of 1Mbps or greater.
l Maintain a minimum link speed of 64Kbps per AP and per bridge-mode SSID. This is the minimum speed
required for downloading software images.
l Adjust the bootstrap threshold to 30 if the network experiences packet loss. This makes the AP recover
more slowly in the event of a failure, but it will be more tolerant to heartbeat packet loss.
l Prioritize AP heartbeats to prevent losing connectivity with the controller.
l If possible, reduce the number of tunnel-mode SSIDs. Each SSID creates a tunnel to the controller with its
own tunnel keep alive traffic.
l If most of the data traffic will remain local to the site, deploy remote APs in bridging mode. For more
information about remote APs, see Access Points on page 566.
l If high-latency links such as transoceanic or satellite links are used in the network, deploy a controller
geographically close to the APs.
l If high-latency causes association issues with certain handheld devices or barcode scanners, check the
manufacturer of the device for recent firmware and driver updates.
Configuring the Bootstrap Threshold
To configure the bootstrap threshold using the WebUI:
1. Navigate to the Configuration > Wireless > AP Configuration page.
2. Select either the AP Group or AP Specific tab. Click Edit by the AP group or AP name.
Dell Networking W-Series ArubaOS 6.4.x | User Guide Access Points |
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