DFS No channel available

Unanswered Question
Oct 21st, 2009

Hi

I've several Lwapp ap monitor and I receive alarms in my WCS from some of them with these messages:

%DOT11-6-DFS_TRIGGERED: DFS: triggered on frequency 5620 MHz

%DOT11-6-DFS_TRIGGERED: DFS: triggered on frequency 5620 MHz

%DOT11-6-DFS_TRIGGERED: DFS: triggered on frequency 5620 MHz

%DOT11-2-NO_CHAN_AVAIL: Interface Dot11Radio1, no channel available.

%LINK-5-CHANGED: Interface Dot11Radio1, changed state to administratively down

%LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio1, changed state to down

I'm not sure about the meaning of them.

DFS changes the monitor channel continuously but why it turns the interface down?

I have this problem too.
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jeff.kish Wed, 10/21/2009 - 13:06

You might have a lot of noise in the DFS channel space. DFS is required as part of the standard anytime there's noise in the UNII II frequency range. Note that this noise doesn't need to be other 802.11 signal.

Try UNII I or III channels (36, 40, 44, 48, 149, 153, 157, 161). They aren't subject to DFS.

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