Help with PC associating to a far away access point
We have an issue in a training room where 4 Dell all in one PC's sometimes have wireless issues. We relocated the AP to directly above the 4 PC's instead of the hallway outside of the training room because off that hallway there is also a lunch room with two microwaves, so we thought that was interfering.
Anyway sometimes one or two of the PC's in this training room fall off the wireless or they must be associating with the AP on the 3rd floor causing the latency to go in upwards of 1900ms in ping times to the machine. Rebooting the PC will usually bring it back to the AP directly above it, resulting in ping times of 1-3 ms.
I drew up a very summarized diagram and what I am thinking is happening is that the wireless signal is bouncing around an emergency stairwell located in the back of the building that has direct access to the 3rd floor, and also that AP on the 3rd floor is at that end of the building near that stairwell. Employees don't use this stairwell, there's two others and also an elevator in the building.
We have a 5508 WLC running on 18.104.22.168 and 6 AP's in this building. Just curious if there is anything I should be checking on the WLC, or do you think this is a PC network card problem where I should be checking drivers, etc...
We could throw a small switch in there and hard wire them, but we got all in ones with wireless because the desks are on castors and being that it is a training room, sometimes they like to move things around in there.
802.11b/g network status and 802.11g support - enabled
Beacon - 100 ms
Short Preamble - Enabled
Fragmentation Threshold - 2346
DTPC Support - Enabled
Maximum Allowed Clients - 200
CCX Location Measurement - Enabled - 60 seconds
Now for the SSID these systems are connecting to,
Client load balancing is unchecked
Client band selected is checked
Coverage hole detection is enabled
MFP Client Protection is optional
DTIM Period is 1 for both a/n and b/g/n
In the trap logs, some of the things I see frequently are:
Interference Profile Failed for Base Radio MAC: 58:35:d9:39:5b:40 and slotNo: 0
Coverage hole pre alarm for client c0:63:94:52:01:cc on 802.11b/g interface of AP 58:35:d9:39:5b:80 (AP3). Hist: 46 14 2 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Interference Profile Updated to Pass for Base Radio MAC: 50:1c:bf:80:5f:d0 and slotNo: 0
And also a bunch of Rouge AP detected or removed from Base Radio MAC.
Hope some of this information helps. It seems that the training room computers have more difficulty when there are people next door with 4 laptops. Still that would only be 8 clients on one AP. That AP has a 1 gig connection to a 3750 switch port.
I even moved up Manditory to 24 Mbps and disabled everything below it. Still an issue.
So I went into device manager and properties for Dell Wireless 1540a/g/n and the advanced tab. I changed Roam Tendancy from Moderate to Conservative, then Roaming Decision from Default to Optimize Bandwidth. I clicked OK. I was remote into the machine and lost the connection. I was able to reconnect (it was MUCH faster). I refreshed the clients screen in the WLC and this particular PC went from the 3rd floor access point, to the access point right above the physical PC. So I am going to make this change to all 4 PC's right under that access point and see if that helps.
Transferring Crash file from standby: Login to the Active WLC in HA.
From CLI: (Cisco Controller) >transfer upload datatype crash (Cisco
Controller) >transfer upload filename (Cisco
Controller) >transfer upload mode tftp (Cisco Controller) >transfer
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