Hi Yuri,
 
Yes I experienced same. The decision which Mesh AP will be chosen as parent its 
not based only on SNR but number of hops to the RAPas well. 
The algorithm also involves some offset values to avoid frequent changes in the 
Mesh tree.
So when you have APs very close to each other, the "ease" value to the RAP is 
not much worse the to the chosen preferred parent and the MAP will go back to 
the RAP.
In other words, just because you force it, it wont choose another parent if the 
path to the RAP is not significantly better.
The way you can make this work in the lab environment, is to have two RAPs.
In this case given that the number of hops is same to a MAP, the SNR difference 
will have major influence on the ease value. This is how it worked for me.
Hope it works for you as well.
 
Oliver

--- On Wed, 9/19/12, Yuri Mecca <[email protected]> wrote:


From: Yuri Mecca <[email protected]>
Subject: [OSL | CCIE_Wireless] Preferred Parent - Indoor Mesh
To: [email protected]
Received: Wednesday, September 19, 2012, 6:38 AM






Hi Guys, 


Yesterday I try to setup a linear mesh with 3 Hops 
(AP-RAP>AP-MAP1>AP-MAP2>AP-MAP3) but I perceived that the feature preferred 
Parents wasn't worked.


I use this sintax:


config mesh parent preferred AP-MAP1 <AP-RAP MAC> 
config mesh parent preferred AP-MAP2 <AP-MAP1 MAC> 
config mesh parent preferred AP-MAP3 <AP-MAP2 MAC> 


I try to reboot any APs, but nothing change and I see that anyone associated to 
the AP-RAP directly.


This 4 APs is near side by side each other, so the SNR is over 50dBM. 


I just use APs 1140, 3500 and 2x 3600. Did anyone expected that before?


Thanks


Yuri
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