Intermec MobileLAN access WA21 System Manual page 151

MobileLAN access System Manual
Global Flooding Parameter Descriptions (continued)
Parameter
Allow Multicast
Outbound to
Terminals (Multicast
Flood Mode enabled)
Unicast Flooding
Unicast Outbound to
Secondary LANs
(Unicast Flood Mode
enabled)
Allow Unicast
Outbound to
Terminals (Unicast
Flood Mode enabled)
Enable ARP Flooding
Chapter 5 — Configuring the Spanning Tree
Explanation
(802.11b, 802.11a, and OpenAir radios only) Determines if
outbound multicast frames with unknown destination
addresses are flooded toward end devices. Typically, this
parameter is checked. However, if your wired devices do not
need to initiate communication with wireless end devices, you
may want to clear this check box.
Determines the flooding structure when this access point
receives inbound unicast frames on non-root ports with
unknown destination addresses. Choose Disabled if you do not
want the access point to flood any inbound unicast frames.
Choose Universal if the access point forwards the unicast frame
to every port. This option uses more bandwidth.
Choose Hierarchical if the access point forwards the unicast
frame only to the port to which the root access point is
attached.
Specifies if outbound unicast frames with unknown destination
addresses are flooded toward secondary LANs.
Choose Enabled if the root access point controls flooding for
all the designated bridges on secondary LANs. Enabling this
parameter makes managing secondary LANs easier because you
do not need to set secondary LAN flooding parameters.
Choose Set Locally if the designated bridges control flooding
on their LANs.
(802.11b, 802.11a, and OpenAir radios only) Determines if
outbound unicast frames with unknown destination addresses
are flooded toward end devices.
Check this check box to enable ARP flooding. When an access
point receives an ARP request, it checks its ARP cache to
determine if the destination end device's IP address is known.
If you enable ARP flooding and:
• the destination end device is known, the access point
translates the ARP request into a unicast frame, which is
only forwarded to the destination end device. Therefore, all
end devices do not need to wake up to listen to the ARP
request, which saves battery life.
• the destination end device is not known, the access point
forwards the ARP request based on its flooding and filtering
settings.
If you disable ARP flooding, the access point ignores ARP
requests for destination end devices that are not in its ARP
cache. You should only use this option if you have no IP
devices in your wireless network.
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