Allied Telesis AT-WL2411 - Manual (Page 80)

AT-WL2411 Installation and User’s Guide
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wireless end devices roam. The database also includes the power
management status of each end device, which allows the access point to
support the pending message feature of the network. The forwarding
database allows the bridging software to make efficient forwarding
decisions.
Switch Support
Ethernet switches that do not comply with the 802.1D standard have
difficulty handling wireless end devices that roam between different
switched segments. The access point provides data link tunneling for
switches that do not handle roaming. Using data link tunneling, frames
for a given end device always appear on the root access point’s switched
segment, regardless of roaming, and the switch’s routing tables remain
stable.
Flooding Configurations
When the destination address is unknown, standard LAN bridges flood
frames on all ports. Most wireless end devices supported by the access
point operate at lower speeds than Ethernet; therefore, indiscriminate
flooding from a busy Ethernet backbone to an end device can consume
a substantial portion of the available wireless bandwidth and reduce
system performance. The access point allows you to set flooding control
options for both unicast and multicast frames to free up bandwidth and
improve system performance.
Pending Messages
Wireless end devices may use power management to maintain battery
life. These end devices wake up periodically to receive frames that
arrived while their radio was powered down. The bridging software in
the access point provides a pending message delivery service that
allows frames to be held until the end device is ready to receive them.
Filtering Options
The access point incorporates extensive filtering capabilities. Basic filters
allow you to filter on DIX type, protocol port, socket, or SAP. Advanced
filters let you create and group filters based on data patterns that you
define.
About
Secondary LANs
and Designated
Bridges
There are two types of secondary LANs: one type is connected to the
primary LAN via an IP tunnel the other type is connected wirelessly to
the primary LAN. For help configuring IP tunnels, see Configuring IP
Tunnels on page 94. For help configuring a wireless secondary LAN, see
Configuring WAPs on page 115.