Automatic Channel Selection; Wmm-Unscheduled Apsd; Multiple Vlans Per Wlan - Motorola RFS7000 Series System Reference Manual

1.2.2.14 Automatic Channel Selection

Automatic channel selection works as follows:
1. When a new AP is adopted, it scans each channel. However, the switch does not forward traffic at
this time.
2. The switch then selects the least crowded channel based on the noise and traffic detected on each
channel.
3. The algorithm used is a simplified maximum entropy algorithm for each radio, where the signal
strength from adjoining AP's/MU's associated to adjoining AP's is minimized.
4. The algorithm ensures adjoining AP's are as far away from each other as possible in terms of channel
assignment.
NOTE Individual radios can be configured to perform automatic channel selection.

1.2.2.15 WMM-Unscheduled APSD

This feature is also known as WMM Power Save or WMM-UPSD (Unscheduled Power Save Delivery). WMM-
UPSD defines an unscheduled service period, which are contiguous periods of time during which the switch is
expected to be awake. If the switch establishes a downlink flow and specifies UPSD power management, then
it requests and the AP delivers buffered frames associated with that flow during an unscheduled service
period. The switch initiates an unscheduled service period by transmitting a trigger frame, where a trigger
frame is defined as a data frame (e.g. an uplink voice frame) associated with an uplink flow having UPSD
enabled. After the AP acknowledges the trigger frame, it transmits the frames in its UPSD power save buffer
addressed to the triggering switch.
UPSD is well suited to support bi-directional frame exchanges between a voice STA and its AP.

1.2.2.16 Multiple VLANs per WLAN

The switch permits the mapping of a WLAN to more than one VLANs. When a MU associates with a WLAN,
the MU is assigned a VLAN by means of a load balance distribution. The switch supports 32 VLANs per WLAN.
The VLAN is picked from a pool assigned to the WLAN. The switch tracks the number of MUs per VLAN, and
assigns the least used/loaded VLAN to the MU. This number is tracked on a per-WLAN basis.
A broadcast key, unique to the VLAN, encrypts all packets coming from the VLAN. This ensures broadcast
integrity across wired and wireless networks. If two or more MUs are on two different VLANs, they both are
able to hear the broadcast packet, but only one can decrypt it. The switch provides each MU a unique VLAN
broadcast key as part of the WPA2 handshake or group key update message of a WPA handshake.
Limiting Users Per VLAN
Multiple VLANs mapped to a WLAN cannot map back to the same IP address pool size. Assign a user limit to
each VLAN to allow the mapping of different pool sizes.
Specify an integer value for a VLAN user limit. This specifies the maximum number of MUs associated with a
VLAN for a particular WLAN. When the number of MUs reaches the maximum limit, no more MUs are assigned
to that VLAN.
Packet Flows
The following types of packet flows are supported when the switch is configured for multiple VLAN per WLAN
support:
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Overview