Clients loose wifi connection in warehouse with 12 APs

[Dusan Sladojevic]

Hi,

We are having problems with wifi connection in a warehouse with 12 Cisco 2702i Access Points.
All clients are having few times a day network breakage that lasts 1-4mins.
in that time client doesnt have any IP address or has APIPA - all clients are configured to receive IP from DHCP.
We have also tried to set clients with static IP address but problem persists.

Acees points are divided into groups of two between these channels - 1,3,5,7,9,11
We are using Motorola VC70N0, WT41N0 and MC9190 as clients connecting to APs.
Warehouse area is around 3500 sqm divided in 9 corridors.

Access points are connected to two Cisco switches  WS-C3650-24PS and the configuration of port is:
description xxx
switchport trunk native vlan 30
switchport mode trunk
switchport nonegotiate
spanning-tree portfast
spanning-tree guard root

All access points are set with power lvl 2, but we have tried lowering power level to 6.
But still we have network loss on Motorola clients.

I have found these logs on both switches:
000838: Nov 12 08:42:17.495: %SW_MATM-4-MACFLAP_NOTIF: Host 4083.de89.d5fe in vlan 30 is flapping between port Gi1/1/4 and port Gi1/0/16
000839: Nov 12 10:22:23.318: %SW_MATM-4-MACFLAP_NOTIF: Host 4083.de83.d508 in vlan 30 is flapping between port Gi1/1/4 and port Gi1/0/17
000840: Nov 12 11:00:32.480: %SW_MATM-4-MACFLAP_NOTIF: Host 4083.de83.d811 in vlan 30 is flapping between port Gi1/0/18 and port Gi1/1/4
000841: Nov 12 11:16:54.552: %SW_MATM-4-MACFLAP_NOTIF: Host 4083.de89.fe9b in vlan 30 is flapping between port Gi1/0/16 and port Gi1/1/4

Does anyone have clue why do we loose wifi connection with these clients?

[Freerk Terpstra]

A few things need to be checked:

• Channel-plan: only use 1,6,11
• Data-rates: tune them for the Motorola devices (at least 11Mbit/s needs to be enabled for some of those type of scanners)
• Complete a real post-deployment site-survey to validate the RF and tune the powerlevels accordingly or maybe even disable radio's if needed)
• Which software version are you running on your WLC?
• On which interfaces do you see those MAC flaps? If you are running flexconnect this is expected behaviour because the clients MAC addresses changes while roaming from AP to AP.
• If flexconnect is being used filter your trunk configuration, if not make it an access-port
• How does your WLAN configuration looks like? (auth, timers etc).
  
  Please rate useful post... :-)

[Dusan Sladojevic]

Hi Freerk,

Thanks for your reply!
We will try changing channel on all AP to only 1,6 and 11. After it we will do the site-survey.
Yes, we are running flexconnect -  nice to hear that MAC flapping is normal thing than.
WLAN authentication is done with certificates.

Will post a another reply to confirm if this has helped.

[Philip Vilhelmsson]

Hi,

Did you ever get this to work?

Regards

Philip

[Dusan Sladojevic]

Hi,

It was fixed with updating the firmware of the WLC.

It turned out that the Version of firmware was making this Problems.

With 2602i everything was running smoothley..

[mohanak]

Refer the link : https://supportforums.cisco.com/discussion/11792136/swmatm-4-macflapnotif-host-00ffffffffff-vlan-112-flapping-between-port-gi301-and