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Parameter
voip-aware-scan
Usage Guidelines
Adaptive Radio Management (ARM) is a radio frequency (RF) resource allocation algorithm that allows each AP to
determine the optimum channel selection and transmit power setting to minimize interference and maximize
coverage and throughput. This command configures an ARM profile that you apply to a radio profile for the 5 GHz
or 2.4 GHz frequency band (see
The default ARM scanning interval is determined by the scan-interval parameter in the ARM profile. If the AP does
not have any associated clients (or if most of its clients are inactive) the ARM feature will dynamically readjust this
default scan interval, allowing the AP obtain better information about its RF neighborhood by scanning non-home
channels more frequently. Starting with ArubaOS 6.2, if an AP attempts to scan a non-home channel but is
unsuccessful, the AP will make additional attempts to rescan that channel before skipping it and continuing on to
other channels.
Using Adaptive Radio Management (ARM) in a Mesh Network
When a mesh portal operates on a mesh network, the mesh portal determines the channel used by the mesh feature.
When a mesh point locates an upstream mesh portal, it will scan the regulatory domain channels list to determine
the channel assigned to it, for a mesh point always uses the channel selected by its mesh portal. However, if a mesh
portal uses an ARM profile enabled with a single-band or multi-band channel/power assignment and the scanning
feature, the mesh portal will scan the configured channel lists and the ARM algorithm will assign the proper channel
to the mesh portal.
If you are using ARM in your network, is important to note that mesh points, unlike mesh portals, do not scan
channels. This means that once a mesh point has selected a mesh portal or an upstream mesh point, it will tune to
this channel, form the link, and will not scan again unless the mesh link gets broken. This provides good mesh link
stability, but may adversely affect system throughput in networks with mesh portals and mesh points. When ARM
assigns optimal channels to mesh portals, those portals use different channels, and once the mesh network has
formed and all the mesh points have selected a portal (or upstream mesh point), those mesh points will not be able
to detect other portals on other channels that could offer better throughput. This type of suboptimal mesh network
may form if, for example, two or three mesh points select the same mesh portal after booting, form the mesh
network, and leave a nearby mesh portal without any mesh points. Again, this will not affect mesh functionality, but
may affect total system throughput.
Example
The following command configures VoIP-aware scanning for the arm-profile named "voice-arm:"
(config) (host) #rf arm-profile voice-arm
voip-aware-scan
Dell PowerConnect W-Series ArubaOS 6.2 | Reference Guide
Description
Dell's VoIP Call Admission Control (CAC) prevents any
single AP from becoming congested with voice calls.
When you enable CAC, you should also enable voip-
aware-scan parameter in the ARM profile, so the AP
will not attempt to scan a different channel if one of
its clients has an active VoIP call. This option requires
that scanning is also enabled.
"rf dot11a-radio-profile" on page 519
Range
—
or
"rf dot11g-radio-profile" on page
Default
disabled
527).
rf arm-profile | 517
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