![]() The understanding is that the signal strength/quality will be so low reliable communication will not be established. Valid values for this field are -80 through -90. If a clients RSSI value is below this threshold it will not associate/authenticate to the access point, instead it will continue to look for a better signal from different access points. The first thing you need to do when you want to customize these settings is change the mode to custom this will allow you to edit the default values for the rest of the parameters. On your Cisco Wireless LAN Controller, you want to navigate to Wireless -> 802.11a/n or 802.11b/g/n (depending on which frequency you want to customize) -> Client Roaming. To see if your clients are CCXv4 compliant go to Monitor -> Clients -> click on the client in question. I would also like to mention your clients should be CCXv4 or higher to take advantage of these features. Just keep in mind, making these settings will effect the entire WLAN not just individual sections. The reason you need to know the details of your wireless environment is because you are going to set RSSI limits concerning when your clients should begin looking for a new AP to associate to and, how quickly they are roam between access points. Now, if you have done a proper site survey and have solid data to work off of, you can control the roaming behavior of your WLAN clients. If the roaming process is not quick enough then you could see conversations and clients gets dropped forcing them reconnect to the WLAN, and I can guarantee you your end users will be calling. They expect to walk freely around the office to conference rooms or far off cubicles and have their laptop or handheld remain connected while downloading files or in the middle of a conversation. Roaming is just another expectation from your end users.
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