I have one Cisco Aironet 1231 access point. It does not use any kind of (server) functionality outside the Cisco device.
I have one SSID and uses WPA-PSK (TKIP).
The configuration seams wary straight forward, but something is wrong.
The access point seams to be unstable. The clients use long time to connect to the access point and it looses connection a lot of times a day. Can I do something to speed up the ?negotiation process? ?
What could be the course of instability?
The configuration was made with the ?web configurator?, but I have a SSH/telnet dump:
While there is a negotiation process between the AP and client, it all happens pretty quickly in a typical (i.e., not severely overloaded) system.
The "access port" problem you described was (probably) because of spanning-tree, that should not be an issue here ... the AP is connected to the switch, and the port is active .. all the spanning-tree stuff should have already occurred.
Try a scan. Find the clearest channel of 1, 6, or 11 and configure your AP for that channel and let us know how it works out.
A "stronger" (more gain) antenna probably won't help. An antenna that transmits with more gain also receives with more gain ..(basically, the same situation, but all of the signals are "louder")
The general remedy, aside from the obvious of going to the least populated channel or moving to the 802.11a band, is usually to add more access points, all using some flavor of "sector" antenna (and / or "patch" antennas) to localize the area of interest.
Because the antennas are covering a more specific area (and usually smaller area), it is usually the case that more APs are needed.
"Seeing" 20 APs is not that alarming ... check the signal strength of each, many will usually be well-below the level that would cause serious interference. The specific level will vary, depending on the location relative to the AP<->client relationship.
If you're seeing 20 APs, and their signal strength is roughly the same as your APs or a little lower, then you've got a problem that only a sectorized antenna system can cure.