H3C Technologies H3C WX3000E Series Wireless Switches - Manual (Page 513)

492
Item Description
Scan
Non-802.11h
Channel
Some of 802.11h channels, also called radar channels, overlap some 802.11a
channels. If the device operates on an overlapping channel, the service quality of the
WLAN might be affected. With this function enabled, the device selects a working
channel from non-802.11h channels belonging to the configured district code to
avoid channel collision.
Selecting the Scan Non-802.11h Channel option enables the function of scanning
non-802.11h channels.
By default, the scan mode is auto, that is, all channels of the country/region code
being set are scanned.
Scan Type
Set the scan type.
• Active—Active scanning requires an AP to send a probe request. This scanning
mode enables an AP to discover devices more easily.
• Passive—Passive scanning is used by a client when it wants to save battery
power. Typically, VoIP clients adopt the passive scanning mode.
For an AP that has the monitoring function:
• Active—The AP simulates a client to send probe requests during the scanning
process.
• Passive—The AP does not send probe requests during the scanning process.
If you set active scanning for the AP, it is more likely to discover devices in the
WLAN.
Scan Interval
Set the scan report interval.
• A longer scan interval enables an AP to discover more devices in the WLAN.
• A shorter scan interval enables an AP to send scanning reports to an AC more
frequently.
If an AP has the monitoring function, the scan report interval will affect whether the
scanning results can be processed in time and the frequency of message exchanges.
Therefore, you need to set the interval correctly according to the actual network
conditions.