Users Guide

Dell PowerConnect W-AirWave 7.4 | Configuration Guide Configuration Reference | 115
Multi Band Scan Yes If enabled, single radio channel APs scans for rogue APs across multiple channels. This
option requires that Scanning is also enabled.
The Multi Band Scan option does not apply to APs that have two radios as these devices
already scan across multiple channels. If one of these dual-radio devices are assigned an
ARM profile with Multi Band enabled, that device will ignore this setting.
Rogue AP Aware No If you have enabled both the Scanning and Rogue AP options, Dell PowerConnect W APs
may change channels to contain off-channel rogue APs with active clients. This security
feature allows APs to change channels even if the Client Aware setting is disabled.
This setting is disabled by default, and should only be enabled in high-security
environments where security requirements are allowed to consume higher levels of
network resources. You may prefer to receive Rogue AP alerts via SNMP traps or syslog
events.
Scan Interval (sec) 10 If Scanning is enabled, the Scan Interval defines how often the AP will leave its current
channel to scan other channels in the band.
Off-channel scanning can impact client performance. Typically, the shorter the scan
interval, the higher the impact on performance. If you are deploying a large number of new
APs on the network, you may want to lower the Scan Interval to help those APs find their
optimal settings more quickly. Raise the Scan Interval back to its default setting after the
APs are functioning as desired.
The supported range for this setting is 0 to 2,147,483,647 seconds.
Active Scan No When the Active Scan checkbox is selected, an AP initiates active scanning via probe
request. This option elicits more information from nearby APs, but also creates additional
management traffic on the network.
Active Scan is disabled by default, and should not be enabled except under the direct
supervision of Dell Support.
Scanning Yes The Scanning field enables or disables AP scanning across multiple channels. Disabling
this option also disables the following scanning features:
 Multi Band Scan
 Rogue AP Aware
 VoIP Aware Scan
 Power Save Aware Scan
Do not disable Scanning unless you want to disable ARM and manually configure AP
channel and transmission power.
Scan Time 110 msec The amount of time, in milliseconds, an AP will drift out of the current channel to scan
another channel. The supported range for this setting is 50 to 2,147,483,647 milliseconds. A
scan time between 50 to 200 msec is recommended.
VoIP Aware Scan No VoIP Call Admission Control (CAC) prevents any single AP from becoming congested with
voice calls. When you enable CAC, you should also enable this ARM profile setting 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, as well as a Voice Service/Policy
Enforcement Firewall license.
Power Save Aware
Scan
Yes If enabled, the AP will not scan a different channel if it has one or more clients and is in
power save mode.
Ideal Coverage
Index
10 The Dell PowerConnect W coverage index metric is a weighted calculation based on the
RF coverage for all Dell PowerConnect W-Series APs and neighboring APs on a specified
channel. The Ideal Coverage Index specifies the ideal coverage that an AP should try to
achieve on its channel. The denser the AP deployment, the lower this value should be. The
range of possible values is 2 to 20.
Acceptable
Coverage Index
4 For multi-band implementations, the Acceptable Coverage Index specifies the minimal
coverage an AP it should achieve on its channel. The denser the AP deployment, the lower
this value should be. The range of possible values is 1 to 6.
Table 53 Profiles > RF > 802.11a/g Radio > ARM Profile Settings (Continued)
Field Default Description