Chapter 8: Wireless Distribution System Bridges
116
You cannot use static WEP or WPA Enterprise on VAP0 of a WDS
bridge.
Dynamic
Frequency
Selection
Dynamic frequency selection (DFS) is an industry standard that defines
how wireless access points are to respond to the presence of radar
signals on 5GHz channels. The standard states that a wireless access
point that detects radar signals on its current 5GHz channel has to stop
transmitting and select another channel to avoid interfering with the
signals.
The wireless access points support DFS on 5GHz channels that countries
or regions have designated as DFS channels. If an access point detects a
radar signal on its current 5GHz channel and if the channel is designated
as a DFS channel, it immediately marks the channel as unusable for a
minimum of thirty minutes and randomly selects another channel with
which to communicate with its clients.
If a wireless access point is using a DFS 5GHz channel for a WDS bridge
and it detects radar signals, it randomly selects another channel so as not
to interfere with the signals. This action, however, renders the bridge
non-functional.
You can prevent this from occurring by selecting a non-DFS 5GHz
channel as the communication link between the wireless access points of
a WDS bridge. Here are three examples of non-DFS channels:
36 - 5180 MHz
40 - 5200 MHz
44 - 5220 MHz
Here are the guidelines for DFS on the wireless access points:
DFS channels vary by country or region.
DFS cannot be disabled on the wireless access points.
DFS does not apply to channels on the 2.4GHz radio.
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