11b/g Android clients roaming to new BSSID's

kemitche · ‎12-21-2015

Hi

This retail environment is using Flex7500 at head office with 2700 AP's at the stores. DHCP and authentication is local (WPA2 Personal). Although the infrastructure vendor has attempted to make the Wi-Fi environment as predictable as possible, 2.4GHz is very congested in the shopping center, and our Android clients keep dropping their association to the correct BSSID and attempting to connect to '3rd party' SSIDs. The signal to the correct BSSID is good.

We have disabled lower speeds on the infrastructure (12Mbps now lowest mandatory), run spectrum analysis and sniffer traces but nothing seems to be obvious.

Any tips for us please?

Thanks

Leo Laohoo · ‎12-21-2015

1. Why prefer 802.11b? What's wrong with 802.11a radio?

2. What happens if you try a different client, like Windows or Apple? Maybe it could be a wireless NIC firmware issue?

3. How's Channel Utilization? How's Spectrum Expert?

4. When the wireless client is connected to the WLAN, can you post the output to the command "sh client detail <wireless client MAC address>".

5. Find the AP connected to the wireless client and post the complete output to the command "sh ap auto-rf 802.11b <AP name>". Do the same to 802.11a.

kemitche · ‎12-21-2015

1. Why prefer 802.11b? What's wrong with 802.11a radio?

No 5GHz support on device

2. What happens if you try a different client, like Windows or Apple? Maybe it could be a wireless NIC firmware issue?

Yes, other Android devices are better, but the manufacturer does not have firmware updates.

3. How's Channel Utilization? How's Spectrum Expert?

SE directed us to ch 6 as the least utilized which we are using.

4. When the wireless client is connected to the WLAN, can you post the output to the command "sh client detail <wireless client MAC address>".

Will do this

5. Find the AP connected to the wireless client and post the complete output to the command "sh ap auto-rf 802.11b <AP name>". Do the same to 802.11a.

Will do this

Thanks

kemitche · ‎12-22-2015

>show sysinfo

Manufacturer's Name.............................. Cisco Systems Inc.
Product Name..................................... Cisco Controller
Product Version.................................. 8.0.120.0
RTOS Version..................................... 8.0.120.0
Bootloader Version............................... 8.0.110.0
Emergency Image Version.......................... 8.0.110.0

Build Type....................................... DATA + WPS

System Name...................................... xxxxxxxxxxxxxxxxxxxxxxxx
System Location..................................
System Contact...................................
System ObjectID.................................. 1.3.6.1.4.1.9.1.1615
Redundancy Mode.................................. Disabled
IP Address....................................... 10.11.15.10
IPv6 Address..................................... ::
System Up Time................................... 81 days 0 hrs 50 mins 47 secs
System Timezone Location......................... (GMT +2:00) Jerusalem
System Stats Realtime Interval................... 5
System Stats Normal Interval..................... 180

--More-- or (q)uit
Configured Country............................... ZA - South Africa
Operating Environment............................ Commercial (10 to 35 C)
Internal Temp Alarm Limits....................... 10 to 38 C
Internal Temperature............................. +21 C
Fan Status....................................... OK

RAID Volume Status
Drive 0.......................................... Good
Drive 1.......................................... Good

State of 802.11b Network......................... Enabled
State of 802.11a Network......................... Enabled
Number of WLANs.................................. 14
Number of Active Clients......................... 541

Burned-in MAC Address............................ 10:05:CA:BF:99:A0
Power Supply 1................................... Present, OK
Power Supply 2................................... Present, OK
Maximum number of APs supported.................. 6000
System Nas-Id.................................... xxxxxxxxxxxxxxxxxxxxxxxxx
WLC MIC Certificate Types........................ SHA1/SHA2

---------------------------------------------------------------------------------------

>show client detail 00:08:22:3a:ec:fc
Client MAC Address............................... 00:08:22:3a:ec:fc
Client Username ................................. N/A
AP MAC Address................................... 54:a2:74:ed:e5:d0
AP Name.......................................... xxxxxxxxxxxxxxxxxxxxxxx
AP radio slot Id................................. 0
Client State..................................... Associated
Client User Group................................
Client NAC OOB State............................. Access
Wireless LAN Id.................................. 22
Wireless LAN Network Name (SSID)................. xxxxxxxxx
Wireless LAN Profile Name........................ MPOS - Apparel
Hotspot (802.11u)................................ Not Supported
BSSID............................................ 54:a2:74:ed:e5:d6
Connected For ................................... 2073 secs
Channel.......................................... 1
IP Address....................................... 10.132.55.131
Gateway Address.................................. Unknown
Netmask.......................................... Unknown
Association Id................................... 1
Authentication Algorithm......................... Open System
Reason Code...................................... 1
Status Code...................................... 0

--More-- or (q)uit
Session Timeout.................................. 0
Client CCX version............................... No CCX support
QoS Level........................................ Silver
Avg data Rate.................................... 0
Burst data Rate.................................. 0
Avg Real time data Rate.......................... 0
Burst Real Time data Rate........................ 0
802.1P Priority Tag.............................. disabled
CTS Security Group Tag........................... Not Applicable
KTS CAC Capability............................... No
WMM Support...................................... Enabled
APSD ACs....................................... BK BE VI VO
Power Save....................................... ON
Current Rate..................................... m7
Supported Rates..................................
Mobility State................................... Local
Mobility Move Count.............................. 0
Security Policy Completed........................ Yes
Policy Manager State............................. RUN
Policy Manager Rule Created...................... Yes
Audit Session ID................................. 0a0f0b0a003ca97e60597656
AAA Role Type.................................... none
Local Policy Applied............................. none

--More-- or (q)uit
IPv4 ACL Name.................................... none
FlexConnect ACL Applied Status................... Unavailable
IPv4 ACL Applied Status.......................... Unavailable
IPv6 ACL Name.................................... none
IPv6 ACL Applied Status.......................... Unavailable
Layer2 ACL Name.................................. none
Layer2 ACL Applied Status........................ Unavailable
Client Type...................................... SimpleIP
mDNS Status...................................... Disabled
mDNS Profile Name................................ none
No. of mDNS Services Advertised.................. 0
Policy Type...................................... WPA2
Authentication Key Management.................... PSK
Encryption Cipher................................ CCMP (AES)
Protected Management Frame ...................... No
Management Frame Protection...................... No
EAP Type......................................... Unknown
FlexConnect Data Switching....................... Local
FlexConnect Dhcp Status.......................... Local
FlexConnect Vlan Based Central Switching......... No
FlexConnect Authentication....................... Local
FlexConnect Central Association.................. No
Quarantine VLAN.................................. 0

--More-- or (q)uit
Access VLAN...................................... 1362
Local Bridging VLAN.............................. 1362
Client Capabilities:
CF Pollable................................ Not implemented
CF Poll Request............................ Not implemented
Short Preamble............................. Implemented
PBCC....................................... Not implemented
Channel Agility............................ Not implemented
Listen Interval............................ 2
Fast BSS Transition........................ Not implemented
Client Wifi Direct Capabilities:
WFD capable................................ No
Manged WFD capable......................... No
Cross Connection Capable................... No
Support Concurrent Operation............... No
Fast BSS Transition Details:
Client Statistics:
Number of Bytes Received................... 17708
Number of Bytes Sent....................... 14305
Total Number of Bytes Sent................. 14305
Total Number of Bytes Recv................. 17708
Number of Bytes Sent (last 90s)............ 256
Number of Bytes Recv (last 90s)............ 603

--More-- or (q)uit
Number of Packets Received................. 78
Number of Packets Sent..................... 65
Number of Interim-Update Sent.............. 0
Number of EAP Id Request Msg Timeouts...... 0
Number of EAP Id Request Msg Failures...... 0
Number of EAP Request Msg Timeouts......... 0
Number of EAP Request Msg Failures......... 0
Number of EAP Key Msg Timeouts............. 0
Number of EAP Key Msg Failures............. 0
Number of Data Retries..................... 320
Number of RTS Retries...................... 0
Number of Duplicate Received Packets....... 3
Number of Decrypt Failed Packets........... 0
Number of Mic Failured Packets............. 0
Number of Mic Missing Packets.............. 0
Number of RA Packets Dropped............... 0
Number of Policy Errors.................... 0
Radio Signal Strength Indicator............ -76 dBm
Signal to Noise Ratio...................... 16 dB
Client Rate Limiting Statistics:
Number of Data Packets Received............ 0
Number of Data Rx Packets Dropped.......... 0
Number of Data Bytes Received.............. 0

--More-- or (q)uit
Number of Data Rx Bytes Dropped............ 0
Number of Realtime Packets Received........ 0
Number of Realtime Rx Packets Dropped...... 0
Number of Realtime Bytes Received.......... 0
Number of Realtime Rx Bytes Dropped........ 0
Number of Data Packets Sent................ 0
Number of Data Tx Packets Dropped.......... 0
Number of Data Bytes Sent.................. 0
Number of Data Tx Bytes Dropped............ 0
Number of Realtime Packets Sent............ 0
Number of Realtime Tx Packets Dropped...... 0
Number of Realtime Bytes Sent.............. 0
Number of Realtime Tx Bytes Dropped........ 0
Nearby AP Statistics:
MRP0445-AP8(slot 0)
antenna0: 2073 secs ago.................. -80 dBm
antenna1: 2073 secs ago.................. -81 dBm
MRP0445-AP6(slot 0)
antenna0: 2073 secs ago.................. -68 dBm
antenna1: 2073 secs ago.................. -65 dBm
MRP0445-AP1(slot 0)
antenna0: 2067 secs ago.................. -74 dBm
antenna1: 2067 secs ago.................. -77 dBm

--More-- or (q)uit
MRP0445-AP4(slot 0)
antenna0: 2072 secs ago.................. -73 dBm
antenna1: 2072 secs ago.................. -77 dBm
MRP0445-AP2(slot 0)
antenna0: 2306 secs ago.................. -66 dBm
antenna1: 2306 secs ago.................. -74 dBm
DNS Server details:
DNS server IP ............................. 0.0.0.0
DNS server IP ............................. 0.0.0.0
Assisted Roaming Prediction List details:
Client Dhcp Required: False
Allowed (URL)IP Addresses
AVC Profile Name: ............................... none

--------------------------------------------------------------

show ap auto-rf 802.11b xxxxxxxxxxxxxxxxxx

Number Of Slots.................................. 2

AP Name.......................................... xxxxxxxxxxxxxxx

MAC Address...................................... 54:a2:74:39:6a:e0

Slot ID........................................ 0

Radio Type..................................... RADIO_TYPE_80211b/g

Sub-band Type.................................. All

Noise Information

Noise Profile................................ PASSED

Channel 1.................................... -91 dBm

Channel 2.................................... -91 dBm

Channel 3.................................... -92 dBm

Channel 4.................................... -96 dBm

Channel 5.................................... -91 dBm

Channel 6.................................... -96 dBm

Channel 7.................................... -94 dBm

Channel 8.................................... -82 dBm

Channel 9.................................... -80 dBm

Channel 10................................... -91 dBm

Channel 11................................... -95 dBm

Channel 12................................... -78 dBm

Channel 13................................... -89 dBm

--More-- or (q)uit-------

Interference Information

Interference Profile......................... PASSED

Channel 1.................................... -70 dBm @ 8 % busy

Channel 2.................................... -128 dBm @ 0 % busy

Channel 3.................................... -74 dBm @ 7 % busy

Channel 4.................................... -128 dBm @ 0 % busy

Channel 5.................................... -64 dBm @ 19 % busy

Channel 6.................................... -60 dBm @ 2 % busy

Channel 7.................................... -72 dBm @ 10 % busy

Channel 8.................................... -128 dBm @ 0 % busy

Channel 9.................................... -128 dBm @ 0 % busy

Channel 10................................... -128 dBm @ 0 % busy

Channel 11................................... -128 dBm @ 0 % busy

Channel 12................................... -128 dBm @ 0 % busy

Channel 13................................... -63 dBm @ 13 % busy

Load Information

Load Profile................................. PASSED

Receive Utilization.......................... 0 %

Transmit Utilization......................... 0 %

Channel Utilization.......................... 55 %

Attached Clients............................. 1 clients

Coverage Information

Coverage Profile............................. PASSED

--More-- or (q)uit

Failed Clients............................... 0 clients

Client Signal Strengths

RSSI -100 dbm................................ 0 clients

RSSI -92 dbm................................ 0 clients

RSSI -84 dbm................................ 1 clients

RSSI -76 dbm................................ 0 clients

RSSI -68 dbm................................ 0 clients

RSSI -60 dbm................................ 0 clients

RSSI -52 dbm................................ 0 clients

Client Signal To Noise Ratios

SNR 0 dB.................................. 0 clients

SNR 5 dB.................................. 0 clients

SNR 10 dB.................................. 0 clients

SNR 15 dB.................................. 1 clients

SNR 20 dB.................................. 0 clients

SNR 25 dB.................................. 0 clients

SNR 30 dB.................................. 0 clients

SNR 35 dB.................................. 0 clients

SNR 40 dB.................................. 0 clients

SNR 45 dB.................................. 0 clients

Nearby APs

AP 54:a2:74:57:e0:70 slot 0.................. -69 dBm on 11 (0a:0b:0f:0a:17:70)

AP e8:65:49:35:93:40 slot 0.................. -69 dBm on 1 (0a:0b:0f:0a:17:70)

--More-- or (q)uit

AP f4:ea:67:be:80:e0 slot 0.................. -56 dBm on 6 (0a:0b:0f:0a:17:70)

Radar Information

Channel Assignment Information

Current Channel Average Energy............... unknown

Previous Channel Average Energy.............. unknown

Channel Change Count......................... 0

Last Channel Change Time..................... Thu Dec 10 18:00:14 2015

Recommended Best Channel..................... 1

RF Parameter Recommendations

Power Level.................................. 2

RTS/CTS Threshold............................ 2347

Fragmentation Threshold...................... 2346

Antenna Pattern.............................. 0

Persistent Interference Devices

Class Type Channel DC (%%) RSSI (dBm) Last Update Time

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Scott Fella · ‎12-22-2015

A few things... You have 14 defined WLAN's. Are all these being used and how many wlans are being used on a given AP? If you have good density and if the AP's are line of sight, your TX power might be lowering too much. Set your max and min TX and make then 3-6dbi apart. I would also look at setting the lowest mandatory maybe at 24mbps and see if things improve and then go up to 36mbps and test again. The other issue you might be running into is the other open SSIDs are probably being sent at a high TX power and the device is preferring that SSID over your customers. I would look at testing a given problematic area and create a new AP Group for testing. Then create an RF profile to be able to play around with max and min tx power and data rates. See what works well and then you have at least a template to use in other locations.

-Scott

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-Scott
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