User's Manual

398 | Virtual APs Dell Networking W-Series ArubaOS 6.4.x| User Guide
Parameter Description
steering mode, the AP will try to steer the client to 5G band (if the client is 5G
capable) but will let the client connect on the 2.4G band if the client persists in
2.4G association attempts.
l Balance-bands: In this band steering mode, the AP tries to balance the clients
across the two radios in order to best utilize the available 2.4G bandwidth. This
feature takes into account the fact that the 5Ghz band has more channels than
the 2.4 Ghz band, and that the 5Ghz channels operate in 40MHz while the
2.5Ghz band operates in 20MHz.
Dynamic Multicast
Optimization (DMO)
Enable/Disable dynamic multicast optimization. This parameter is disabled by
default, and cannot be enabled without the PEFNG license.
Drop Broadcast and
Multicast
Select the Drop Broadcast and Multicast checkbox to filter out broadcast and
multicast traffic in the air.
Do not enable this option for virtual APs configured in bridge forwarding mode. This
configuration parameter is only intended for use for virtual APs in tunnel mode. In
tunnel mode, all packets travel to the controller, so the controller is able to drop all
broadcast traffic. When a virtual AP is configured to use bridge forwarding mode,
most data traffic stays local to the AP, and the controller is not able to filter out that
broadcast traffic.
IMPORTANT: If you enable this option, you must also enable the Broadcast-Filter
ARP parameter on the virtual AP profile to prevent ARP requests from being
dropped. You can enable this parameter by checking the Convert Broadcast ARP
requests to unicast check box as described in the following parameter
description.
Convert Broadcast
ARP requests to
unicast
If enabled, all broadcast ARP requests are converted to unicast and sent directly to
the client. You can check the status of this option using the show ap active and the
show datapath tunnel command. If enabled, the output will display the letter a in
the flags column.
This configuration parameter is only intended for use for virtual APs in tunnel
mode. In tunnel mode, all packets travel to the controller, so the controller is able to
convert ARP requests directed to the broadcast address into unicast.
When a virtual AP is configured to use bridge forwarding mode, most data traffic
stays local to the AP, and the controller is not able to convert that broadcast traffic.
Beginning with ArubaOS 6.1.3.2, this parameter is enabled by default. Behaviors
associated with these settings are enabled upon upgrade to ArubaOS 6.1.3.2. If
your controller supports clients behind a wireless bridge or virtual clients on
VMware devices, you must disable this setting to allow those clients to obtain an IP
address. In previous releases of ArubaOS, the virtual AP profile included two unique
broadcast filter parameters; the drop broadcast and multicast parameter, which
filtered out all broadcast and multicast traffic in the air except DHCP response
frames (these were converted to unicast frames and sent to the corresponding
client) and the conert ARP requests to unicast parameter, which converted
broadcast ARP requests to unicast messages sent directly to the client.
Starting with ArubaOS 6.1.3.2, the Convert Broadcast ARP requests to unicast
setting includes the additional functionality of broadcast-filter all parameter, where
DHCP response frames are sent as unicast to the corresponding client. This can
impact DHCP discover/requested packets for clients behind a wireless bridge and
virtual clients on VMware devices. Disable this option to resolve this issue and allow
clients behind a wireless bridge or VMware devices to receive an IP address.
Default: Enabled
Advanced Configuration Settings
Dynamic Multicast
Optimization (DMO)
Threshold
Maximum number of high-throughput stations in a multicast group beyond which
dynamic multicast optimization stops.
Range: 2-255 stations
Default: 6 stations.