Without looking at the configuration, what I can recommend you is to try the following: - The "distance" command on the root bridge (in km). In your case it would be 3. - The data rates set for best range; use the "speed range" command on the radio interface
if these recommendations don't work then get the output from the show tech command to verify the configuration and the quality of the link. If everything is properly configure and you are running the latest software code already then there is nothing else to do other than troubleshoot the RF issue itself by finding the sources of interference near the antennas, making sure that the LOS is clear as well as the Fresnel zone, verifying the quality of the cabling, connectors etc. Or just perform a professional site survey to let you know all of this information.