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Understanding TotalWatch Channel Visiting
The Active and DOS channels are visited more frequently than the other channels. The order of preference in
selecting the next channel is:
1. DOS
2. Active
3. reg-domain
4. All-reg-domain
5. Rare
Once a channel is selected, the dwell time for that channel is determined based on the channel type. At the end of
the dwell time, a new channel is picked.
Understanding TotalWatch Age out of Devices
ArubaOS uses a combination of inactivity time and unseen time to age out a device. This ensures that the channel
is scanned a sufficient number of times before a device ages out. AM module maintains the following parameters:
Discovered Time—The absolute time, in seconds, since the device was discovered.
Monitored Time—The number of times the channel was scanned since discovery.
Inactivity Time—The number of times the device was not “seen” when the channel is scanned.
Unseen Time—The absolute time, in seconds, since the device was last “seen.”
Administering TotalWatch
The AM module will initialize the channel list for each of the AP’s radio based on the scan mode setting for the
radio. For example, if scan mode is set to rare, then the channel list will contain all possible channels. You can view
these channels by using the show ap arm scan-times command.
Configuring Per Radio Settings
For each radio, you can configure the following settings (for detailed information on commands, refer to the
Dell
PowerConnect W-Series ArubaOS 6.2 Command Line Interface Guide
):
l the dwell times for the various channel types
l the channel list that should be used for scanning
These settings are configured via the command rfam-scan-profile, which can be attached to the two profiles,
dot11a-radio-profile and dot11g-radio-profile.
The am-scan-profile includes the following parameters that can be configured:
rf am-scan-profile <name>
scan-mode [reg-domain | all-reg-domain | rare]
The default setting is the all-reg-domain. This is consistent with the default functioning of the AM scanning where
the radio scans channels belonging to all regulatory domains.
Configuring Per AP Setting
If the AP is a dual-band single radio AP, an option is available to specify which band should be used for scanning in
AM-mode. This setting is available in the “ap system-profile”, via the am-scan-rf-band command.
ap system-profile <name>
am-scan-rf-band [a | g | all]
DellPowerConnectW-SeriesArubaOS6.2 | User Guide WirelessIntrusion Prevention | 390