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-timescommand.

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):

the dwell times for the various channel types

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-profileand 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]

Dell PowerConnect W-Series ArubaOS 6.2 User Guide

Wireless Intrusion Prevention 390

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Dell 6.2 Administering TotalWatch, Understanding TotalWatch Channel Visiting, Understanding TotalWatch Age out of Devices

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