AIR-LAP1262N-A-K9 802.11b and b/g clients frequent disconnects

[evarner]

I have a new deployment with a Cisco 5508-50 controller running 7.0.220.0 code and 35 AIR-LAP1262N-A-K9 access points. Current legacy clients have trouble connecting and after connecting they may or may not drop off and have trouble connecting again. Any ideas would be appreciated.

[nikhilcherian]

can you try to disable 11n in the 802.11a and 802.11b/g parameters

[evarner]

Yes

Sent from my iPhone please excuse any errors or omissions.

[daviwatk]

We should start with figuring out why the clients are having trouble connecting or are being disconnected in the first place before making changes to the WLC.

Can you capture a client debug for one of the devices?

>config sessions timeout 0

>debug client

Start the debug and then try and connect the client.  If it fails, submit the outputs so we can see at what point the client failed to properly enter the RUN state.  If it connects OK, leave the debug running until it appears the client has been disconnected and then submit the outputs.

[evarner]

I am remote to the site and I will not be on site for a while.

[Vinay Saini]

You may also want to check if Band-select feature is enabled , which results in b/g client connection delayed based on the configuration.

Thanks

[evarner]

Here is what I got  debugging one client.

login as: dci

(Cisco Controller)
User: dci
Password:********
(Cisco Controller) >config sessions timeout 0

(Cisco Controller) >debug client 00022d65b0f8

(Cisco Controller) >
(Cisco Controller) >*apfReceiveTask: Mar 12 15:04:06.303: invalid interface name         (management) in mscb!!!
*apfReceiveTask: Mar 12 15:04:43.903: invalid interface name (management) in msc        b!!!
*apfReceiveTask: Mar 12 15:04:46.703: invalid interface name (management) in msc        b!!!
*apfReceiveTask: Mar 12 15:05:07.903: invalid interface name (management) in msc        b!!!
*apfReceiveTask: Mar 12 15:05:09.703: invalid interface name (management) in mscb!!!
*apfReceiveTask: Mar 12 15:05:25.903: invalid interface name (management) in mscb!!!
*apfReceiveTask: Mar 12 15:05:28.303: invalid interface name (management) in mscb!!!
*apfReceiveTask: Mar 12 15:05:29.303: invalid interface name (management) in mscb!!!
*apfReceiveTask: Mar 12 15:05:38.303: invalid interface name (management) in mscb!!!
*apfReceiveTask: Mar 12 15:05:42.103: invalid interface name (management) in mscb!!!
*apfReceiveTask: Mar 12 15:05:53.103: invalid interface name (management) in mscb!!!
*apfReceiveTask: Mar 12 15:06:07.303: invalid interface name (management) in mscb!!!

(Cisco Controller) >
(Cisco Controller) >no debug client 00022d65b0f8*apfReceiveTask: Mar 12 15:07:03.903: invalid interface name (management) in mscb!!!
*apfReceiveTask: Mar 12 15:07:28.103: invalid interface name (management) in mscb!!!

Incorrect usage.  Use the '?' or key to list commands.

(Cisco Controller) >
(Cisco Controller) >
(Cisco Controller) >*apfReceiveTask: Mar 12 15:07:29.703: invalid interface name (management) in mscb!!!
*apfReceiveTask: Mar 12 15:07:46.103: invalid interface name (management) in mscb!!!

[nikhilcherian]

Can you see if the interface configured for the WLAN is correct and the DHCP server is properly configured for the interface

Please poset show wlan and show interface detailed

Thanks

NikhiL

[evarner]

The interface for the WLAN is the management interface. The customer has a flat network at the facility.I just found out thR Dhcp for the interface points to the controller but the dhcp server is on another network.

Sent from my iPhone please excuse any errors or omissions.

[daviwatk]

Did you attempt to connect your wireless client after you started this debug?  It looks like you ran it for about 3 seconds and at no point did the client even send an association request.  Can you also post your interface summary?

>show interface summary

[nikhilcherian]

Let us know if pointing the DHCP server to the correct interface resolved the issue

[evarner]

If I change the parameter will it disrupt clients connected to the WLAN?

Edward M. Varner

Advanced Technology Consultant

CCDA,CCENT,CWLANDE

evarner@digitalconnections.com

Cell: 678-778-5306

Office: 615-826-5000

Digital Connections Inc.

http://www.digitalconnections.com<>

[evarner]

login as: dci

(Cisco Controller)

User: dci

Password:********

(Cisco Controller) >show interface summary

Interface Name Port Vlan Id IP Address Type Ap Mgr Gu est

[nikhilcherian]

If you change the WLAN parameters it will disrupt the clients, but if the clients are not getting connected properly you can change the paremeters.

show interface summary" output is not there in what you have pasted

[evarner]

login as:

(Cisco Controller)
User: dci
Password:********
(Cisco Controller) >show interface summary

Interface Name                   Port Vlan Id  IP Address      Type    Ap Mgr Gu                 est
-------------------------------- ---- -------- --------------- ------- ------ --                 ---
management                       LAG  untagged 172.16.8.220    Static  Yes    No                
service-port                     N/A  N/A      172.16.0.10     Static  No     No                
virtual                          N/A  N/A      1.1.1.1         Static  No     No                

(Cisco Controller) >show wlan 1

WLAN Identifier.................................. 1
Profile Name..................................... PFGELKTON
Network Name (SSID).............................. PFGELKTON
Status........................................... Enabled
MAC Filtering.................................... Disabled
Broadcast SSID................................... Enabled
AAA Policy Override.............................. Disabled
Network Admission Control

  Radius-NAC State............................... Disabled
  SNMP-NAC State................................. Disabled
  Quarantine VLAN................................ 0
Maximum number of Associated Clients............. 0
Number of Active Clients......................... 36
Exclusionlist Timeout............................ 60 seconds
Session Timeout.................................. Infinity
CHD per WLAN..................................... Enabled
Webauth DHCP exclusion........................... Disabled
Interface........................................ management
Multicast Interface.............................. Not Configured

--More-- or (q)uit
WLAN ACL......................................... unconfigured
DHCP Server...................................... Default
DHCP Address Assignment Required................. Disabled
Static IP client tunneling....................... Disabled
Quality of Service............................... Silver (best effort)
Scan Defer Priority.............................. 5,6
Scan Defer Time.................................. 100 milliseconds
WMM.............................................. Allowed
WMM UAPSD Compliant Client Support............... Disabled
Media Stream Multicast-direct.................... Disabled
CCX - AironetIe Support.......................... Disabled
CCX - Gratuitous ProbeResponse (GPR)............. Disabled
CCX - Diagnostics Channel Capability............. Disabled
Dot11-Phone Mode (7920).......................... Disabled
Wired Protocol................................... None
IPv6 Support..................................... Disabled
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

--More-- or (q)uit
   Accounting.................................... Global Servers
   Dynamic Interface............................. Disabled
Local EAP Authentication......................... Disabled
Security

   802.11 Authentication:........................ Open System
   Static WEP Keys............................... Enabled
        Key Index:...................................... 1
        Encryption:..................................... 104-bit WEP
   802.1X........................................ Disabled
   Wi-Fi Protected Access (WPA/WPA2)............. Disabled
   CKIP ......................................... Disabled
   Web Based Authentication...................... Disabled
   Web-Passthrough............................... Disabled
   Conditional Web Redirect...................... Disabled
   Splash-Page Web Redirect...................... Disabled
   Auto Anchor................................... Disabled
   H-REAP Local Switching........................ Disabled
   H-REAP Local Authentication................... Disabled
   H-REAP Learn IP Address....................... Enabled
   Client MFP.................................... Optional but inactive (WPA2 no                 t configured)
   Tkip MIC Countermeasure Hold-down Timer....... 60
Call Snooping.................................... Disabled

--More-- or (q)uit
Roamed Call Re-Anchor Policy..................... Disabled
SIP CAC Fail Send-486-Busy Policy................ Enabled
SIP CAC Fail Send Dis-Association Policy......... Disabled
Band Select...................................... Disabled
Load Balancing................................... Disabled

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

(Cisco Controller) >show show interface detailed management

Incorrect usage.  Use the '?' or key to list commands.

(Cisco Controller) >