What can i do to restrict client switching between AP's

[Patrick Werner]

Hello Community.

Problem is in one office if the client is exact in the middle of the two AP's the clients jumps from one AP to another all the time if he moves one step to right or one step to the left. How do i change these ap switching sensing ? The client uses a WLAN phone and during the AP's switch he get a little noise on the phone.

Thanks for your help and best regards

[Scott Fella]

That is a tough one since the client is responsible for making the decision. A few basic thing though, are the AP's on different channels and what is the power level on the AP's. Can you also post the show WLAN of the SSID.

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[Patrick Werner]

The APs are on differenet channels because of DCA, the power level where on Automatic "1" i set the power level in TPC from Automatic to fixed "2".

The show wlan:

WLAN Identifier.................................. 1
Profile Name..................................... internet
Network Name (SSID).............................. internet
Status........................................... Enabled
MAC Filtering.................................... Disabled
Broadcast SSID................................... Enabled
AAA Policy Override.............................. Disabled
Network Admission Control
  Client Profiling Status ....................... Disabled
   DHCP ......................................... Disabled
   HTTP ......................................... Disabled
  Radius-NAC State............................... Disabled
  SNMP-NAC State................................. Disabled
  Quarantine VLAN................................ 0
Maximum number of Associated Clients............. 0
Maximum number of Clients per AP Radio........... 200
Number of Active Clients......................... 17
Exclusionlist Timeout............................ 60 seconds
Session Timeout.................................. 64800 seconds
User Idle Timeout................................ 300 seconds

--More-- or (q)uit
User Idle Threshold.............................. 0 Bytes
NAS-identifier................................... WLC01
CHD per WLAN..................................... Enabled
Webauth DHCP exclusion........................... Disabled
Interface........................................ management
Multicast Interface.............................. Not Configured
WLAN IPv4 ACL.................................... unconfigured
WLAN IPv6 ACL.................................... unconfigured
mDNS Status...................................... Enabled
mDNS Profile Name................................ default-mdns-profile
DHCP Server...................................... Default
DHCP Address Assignment Required................. Disabled
Static IP client tunneling....................... Disabled
Quality of Service............................... Silver
Per-SSID Rate Limits............................. Upstream      Downstream
Average Data Rate................................   0             0
Average Realtime Data Rate.......................   0             0
Burst Data Rate..................................   0             0
Burst Realtime Data Rate.........................   0             0
Per-Client Rate Limits........................... Upstream      Downstream
Average Data Rate................................   0             0
Average Realtime Data Rate.......................   0             0
Burst Data Rate..................................   0             0

--More-- or (q)uit
Burst Realtime Data Rate.........................   0             0
Scan Defer Priority.............................. 4,5,6
Scan Defer Time.................................. 100 milliseconds
WMM.............................................. Allowed
WMM UAPSD Compliant Client Support............... Disabled
Media Stream Multicast-direct.................... Disabled
CCX - AironetIe Support.......................... Enabled
CCX - Gratuitous ProbeResponse (GPR)............. Disabled
CCX - Diagnostics Channel Capability............. Disabled
Dot11-Phone Mode (7920).......................... Disabled
Wired Protocol................................... None
Passive Client Feature........................... Disabled
Peer-to-Peer Blocking Action..................... Disabled
Radio Policy..................................... All
DTIM period for 802.11a radio.................... 1
DTIM period for 802.11b radio.................... 1
Radius Servers
   Authentication................................ Global Servers
   Accounting.................................... Global Servers
      Interim Update............................. Disabled
   Dynamic Interface............................. Disabled
   Dynamic Interface Priority.................... wlan
Local EAP Authentication......................... Disabled

--More-- or (q)uit
Security

   802.11 Authentication:........................ Open System
   FT Support.................................... Disabled
   Static WEP Keys............................... Disabled
   802.1X........................................ Disabled
   Wi-Fi Protected Access (WPA/WPA2)............. Enabled
      WPA (SSN IE)............................... Disabled
      WPA2 (RSN IE).............................. Enabled
         TKIP Cipher............................. Disabled
         AES Cipher.............................. Enabled
                                                               Auth Key Management
         802.1x.................................. Disabled
         PSK..................................... Enabled
         CCKM.................................... Disabled
         FT-1X(802.11r).......................... Disabled
         FT-PSK(802.11r)......................... Disabled
         PMF-1X(802.11w)......................... Disabled
         PMF-PSK(802.11w)........................ Disabled
      FT Reassociation Timeout................... 20
      FT Over-The-DS mode........................ Enabled
      GTK Randomization.......................... Disabled
      SKC Cache Support.......................... Disabled

--More-- or (q)uit
      CCKM TSF Tolerance......................... 1000
   WAPI.......................................... Disabled
   Wi-Fi Direct policy configured................ Disabled
   EAP-Passthrough............................... Disabled
   CKIP ......................................... Disabled
   Web Based Authentication...................... Disabled
   Web-Passthrough............................... Disabled
   Conditional Web Redirect...................... Disabled
   Splash-Page Web Redirect...................... Disabled
   Auto Anchor................................... Disabled
   FlexConnect Local Switching................... Disabled
   flexconnect Central Dhcp Flag................. Disabled
   flexconnect nat-pat Flag...................... Disabled
   flexconnect Dns Override Flag................. Disabled
   FlexConnect Vlan based Central Switching ..... Disabled
   FlexConnect Local Authentication.............. Disabled
   FlexConnect Learn IP Address.................. Enabled
   Client MFP.................................... Optional
   PMF........................................... Disabled
   PMF Association Comeback Time................. 1
   PMF SA Query RetryTimeout..................... 200
   Tkip MIC Countermeasure Hold-down Timer....... 60
AVC Visibilty.................................... Disabled

--More-- or (q)uit
AVC Profile Name................................. None
Flow Monitor Name................................ None
Call Snooping.................................... Disabled
Roamed Call Re-Anchor Policy..................... Disabled
SIP CAC Fail Send-486-Busy Policy................ Enabled
SIP CAC Fail Send Dis-Association Policy......... Disabled
KTS based CAC Policy............................. Disabled
Assisted Roaming Prediction Optimization......... Disabled
802.11k Neighbor List............................ Disabled
802.11k Neighbor List Dual Band.................. Disabled
Band Select...................................... Disabled
Load Balancing................................... Disabled
Multicast Buffer................................. Disabled

Mobility Anchor List
WLAN ID     IP Address            Status
-------     ---------------       ------

802.11u........................................ Disabled

MSAP Services.................................. Disabled

[Scott Fella]

Looks fine. The phone might be looking at the QBSS load on the ap and making a decision. How many AP's do you have and how many clients per ap.

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[Patrick Werner]

11 AP and about 10 clients

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[Scott Fella]

The reason I asked is that that ap you posted has 17 clients. So depending on how the client device reacts to the QBSS information, it might or will want to roam to an adjacent access point with a lower load.

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[Patrick Werner]

17 clients per Wlan?

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[Scott Fella]

My bad... Look at the access point client load which the device flips back and fourth on. What is the client count in each? There is nothing you can configure on the WLC to stop a device from wanting to connect to whatever access point. Typically supplicants can be adjusted on the client, but you really don't want to touch that. You can try to reduce the cell size by disabling the lower data rates and setting the power lower, but I don't think that will matter since you said that the device is in between two access points and roaming from one to the other. See if the device has an updated driver.

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[George Stefanick]

I might add .. What kind of client is having this issue .. Also are you on the newest driver for this devices .. Is the supplicant for this device configured for aggressive roaming ?

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[Patrick Werner]

Its a cisco 7921 phone.

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[Patrick Werner]

How do i check the client load on the ap. I checked the monitor - client tab and saw that the client is sometime on the ap1 and sometime on the ap2. But yes, i understand the problem, its the same problem if you where between to WWAN antennes with a mobile device.

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