At 01:33 AM 6/18/2003 +0000, The Road Goes Ever On wrote:
>Not knowing firsthand, I've checked the Cisco documentation. For the 1200
>series of AP's, at least, I can find no reference to spanning tree. Not
>saying it isn't there. Just saying I see no reference.

FWIW, the Aironet 1400 wireless bridge does support spanning tree. The 
other Aironet devices probably don't. In fact one of the Aironet 350 
documents mentions that a loop may form if incorrect topology is used.

>A wireless bridge is a device for point to point wireless communication with
>another wireless bridge. It is more like a serial link than what most folks
>think of when they hear the term "bridge".   one of those newfangled terms
>that is in the purist sense misused, but neverless is used differently than
>in the world of switches.

The Aironet 1400 is called (maybe incorrectly?) a wireless bridge and it 
does support point to multipoint setups. I have never used it but from the 
documentation it does look similar to a conventional bridge. I also noticed 
that in the Cisco terminology, access points and bridges are clearly 
distinguished. In other discussions this distinction is not always apparent.

>So, one way for wireless, with it's single ethernet port, to create a loop
>would be for it to bridge to anther AP, which in turn is plugged into the
>same switch. Loops would form and the ensuing broadcast storm could wreak
>havoc.

Shouldn't the switch (assuming it supports STP) break the loop by blocking 
one of the two ports?

Thanks,

Zsombor




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