Cisco Cisco Aironet 340 Ethernet Bridges Guia Do Utilizador

If this parameter is enabled, the Aironet 340 Series Bridge will add 
extensions to some of the IEEE 802.11 management packets. This passes 
more information to other radio nodes allowing them to associate to the 
best bridge.

Even with the extensions enabled, other manufacturer’s nodes should 
ignore the extra information. However, if they become confused, this 
parameter may be disabled.

This option controls whether client nodes will be allowed to associate if 
they specify the empty or broadcast SSID. Clients that do not know the 
SSID of the bridge can transmit packets with the broadcast SSID. Any 
bridges present will respond with a packet showing their SSID. The cli-
ent will then adopt the SSID and associate.

If you wish to ensure that clients know the SSID beforehand then dis-
able this function.

This parameter determines the minimum size transmitted packet that 
will use the RTS/CTS protocol. The value entered must be in the range 
of 100 to 2048 bytes.

This protocol is most useful in networks where the mobile nodes may 
roam far enough so the nodes on one side of the cell cannot hear the 
transmission of the nodes on the other side of the cell.

When the transmitted packet is large enough, a small packet is sent out 
(an RTS). The destination node must respond with another small packet 
(a CTS) before the originator may send the real data packet. A node at 
the far end of a cell will see the RTS to/from the bridge or the CTS to/
from the bridge. The node will know how long to block its transmitter to 
allow the real packet to be received by the bridge. The RTS and CTS are 
small and, if lost in a collision, they can be retried more quickly and 
with less overhead than if the whole packet must be retried.