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Table Of Contents
565| Access Points Dell Networking W-Series ArubaOS 6.5.x| User Guide
In the CLI
The show ap arm scan-times ap-name <ap_name> command is used to show scan state and flags for each
channel.
(host)(config) #show ap arm scan-times ap-name <ap-name>
Scanning Optimizations
The following optimizations are introduced in ArubaOS 6.4.3, to enable the AP to achieve optimum RF
monitoring. Unconventional Scans and Relative Priority of Channel Type Categories optimization apply to all AP
types, but Channel Group Scanning optimization applies only to W-AP200 Series models. All optimizations
apply to AP and AM mode scanning.
Unconventional (direction) Scans
l Unconventional scans are 40MHz scans of a channel in the direction away from the channel pair. For
example, in the 44-48 channel pair:
n Conventional scans will be 44+ and 48-
n Unconventional scans will be 44- and 48+
l Unconventional scans are no longer interspersed with conventional scans. Unconventional scans operate
with a lower frequency, because they belong to a new low priority channel type.
l Unconventional scans are performed in all-regulatory and rare scan modes. But these scans will not be
performed if the scan mode is set to regulatory domain. This modification enables the AP to scan through
active channels, regulatory channels, and all-regulatory channels faster.
Currently, W-AP200 Series access points do not support unconventional or rare channel scanning.
Modifications in Scan Frequency
A modification is introduced to increase the frequency of visits to active and regulatory domain channels.
Channel type categories are:
l DOS
l Active
l Regulatory domain
l All-regulatory domain
l Unconventional or rare
Unconventional or rare channels are merged for scanning.
Channel Group Scanning
Since a 11ac AP radio can hear frames sub-channels when it performs an 80MHz wide scan, scanning can be
optimized by categorizing channels into scan groups, which are visited sequentially when a new primary
channel is selected. This allows the AP scan through the list of channels faster, so that the delay between visits
to channels in a group is reduced.
For more information on Channel Group Scanning, see Channel Group Scanning on page 565
Channel Group Scanning
The following section describes channel group scanning: