Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. If you'd prefer to explore, try our test area to get started. And see here for current known issues.

New Member

Beamforming troubleshooting on AIR AP1142

Hello!

I set up beamforming (ClientLink) at both frequencies 2.4GHz and 5GHz on AIR-AP1142N-R-K9:

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

AP#sh vers

Cisco IOS Software, C1140 Software (C1140-K9W7-M), Version 15.2(2)JA, RELEASE SOFTWARE (fc1)

AP#sh run int dot11Radio 0

interface Dot11Radio0

...

beamform ofdm

...

AP#sh run int dot11Radio 1

interface Dot11Radio1

...

beamform ofdm

...

AP#sh controllers dot11Radio 0 | i Beam

Hardware Beamforming: Configured Yes, Active Yes, RSSI Threshold -50 dBm

AP#sh controllers dot11Radio 1 | i Beam

Hardware Beamforming: Configured Yes, Active Yes, RSSI Threshold -60 dBm

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

All clients are connected to wifi on 2.4GHz on Dot11Radio0:

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

AP#sh dot11 associations

802.11 Client Stations on Dot11Radio0:

SSID [UE-WiFi] :

MAC Address    IP address      Device        Name            Parent         State

1111.1111.1111 10.255.0.35     unknown       -               self           Assoc

2222.2222.2222 10.255.0.34     unknown       -               self           Assoc

3333.3333.3333 10.255.0.36     unknown       -               self           Assoc

SSID [WiFi-UE-Group] :

MAC Address    IP address      Device        Name            Parent         State

4444.4444.4444 10.10.30.71     ccx-client    -               self           EAP-Assoc

SSID [WiFi-UE-Printers] :

MAC Address    IP address      Device        Name            Parent         State

5555.5555.5555 10.10.30.77     ccx-client    -               self           Assoc

6666.6666.6666 10.10.30.75     ccx-client    -               self           Assoc

7777.7777.7777 10.10.30.70     ccx-client    -               self           Assoc

AP#sh dot11 associations all-client

Address           : 1111.1111.1111     Name             : NONE

CCX Version       : NONE               Client MFP       : Off

Key Mgmt type     : WPAv2 PSK          Encryption       : AES-CCMP

Current Rate      : m5-2               Capability       : WMM ShortHdr ShortSlot

Supported Rates   : 1.0 2.0 5.5 11.0 6.0 9.0 12.0 18.0 24.0 36.0 48.0 54.0 m0-2 m1-2 m2-2 m3-2 m4-2 m5-2 m6-2 m7-2

Voice Rates       : disabled           Bandwidth        : 20 MHz

Signal Strength   : -77  dBm           Connected for    : 3835 seconds

Signal to Noise   : 18  dB            Activity Timeout : 60 seconds

Address           : 2222.2222.2222     Name             : NONE

CCX Version       : NONE               Client MFP       : Off

Key Mgmt type     : WPAv2 PSK          Encryption       : AES-CCMP

Current Rate      : m5-2               Capability       : WMM ShortHdr ShortSlot

Supported Rates   : 1.0 2.0 5.5 11.0 6.0 9.0 12.0 18.0 24.0 36.0 48.0 54.0 m0-2 m1-2 m2-2 m3-2 m4-2 m5-2 m6-2 m7-2

Voice Rates       : disabled           Bandwidth        : 20 MHz

Signal Strength   : -59  dBm           Connected for    : 3475 seconds

Signal to Noise   : 37  dB            Activity Timeout : 60 seconds

Address           : 3333.3333.3333     Name             : NONE

CCX Version       : NONE               Client MFP       : Off

Key Mgmt type     : WPAv2 PSK          Encryption       : AES-CCMP

Current Rate      : m7-2               Capability       : WMM ShortHdr ShortSlot

Supported Rates   : 1.0 2.0 5.5 11.0 6.0 9.0 12.0 18.0 24.0 36.0 48.0 54.0 m0-2 m1-2 m2-2 m3-2 m4-2 m5-2 m6-2 m7-2

Voice Rates       : disabled           Bandwidth        : 20 MHz

Signal Strength   : -56  dBm           Connected for    : 2681 seconds

Signal to Noise   : 31  dB            Activity Timeout : 56 seconds

Address           : 4444.4444.4444     Name             : NONE

CCX Version       : 4                  Client MFP       : Off

Key Mgmt type     : WPAv2              Encryption       : AES-CCMP

Current Rate      : 54.0               Capability       : WMM ShortHdr ShortSlot

Supported Rates   : 1.0 2.0 5.5 11.0 6.0 9.0 12.0 18.0 24.0 36.0 48.0 54.0

Voice Rates       : disabled           Bandwidth        : 20 MHz

Signal Strength   : -57  dBm           Connected for    : 3647 seconds

Signal to Noise   : 33  dB            Activity Timeout : 18 seconds

Address           : 5555.5555.5555     Name             : NONE

CCX Version       : 4                  Client MFP       : Off

Key Mgmt type     : WPAv2 PSK          Encryption       : TKIP

Current Rate      : 48.0               Capability       : WMM ShortHdr ShortSlot 11h

Supported Rates   : 1.0 2.0 5.5 11.0 6.0 9.0 12.0 18.0 24.0 36.0 48.0 54.0

Voice Rates       : disabled           Bandwidth        : 20 MHz

Signal Strength   : -51  dBm           Connected for    : 5973 seconds

Signal to Noise   : 35  dB            Activity Timeout : 274 seconds

Address           : 6666.6666.6666     Name             : NONE

CCX Version       : 4                  Client MFP       : Off

Key Mgmt type     : WPAv2 PSK          Encryption       : AES-CCMP

Current Rate      : 54.0               Capability       : WMM ShortHdr ShortSlot 11h

Supported Rates   : 1.0 2.0 5.5 11.0 6.0 9.0 12.0 18.0 24.0 36.0 48.0 54.0

Voice Rates       : disabled           Bandwidth        : 20 MHz

Signal Strength   : -52  dBm           Connected for    : 3090 seconds

Signal to Noise   : 44  dB            Activity Timeout : 308 seconds

Address           : 7777.7777.7777     Name             : NONE

CCX Version       : 4                  Client MFP       : Off

Key Mgmt type     : WPAv2 PSK          Encryption       : AES-CCMP

Current Rate      : 54.0               Capability       : WMM ShortHdr ShortSlot 11h

Supported Rates   : 1.0 2.0 5.5 11.0 6.0 9.0 12.0 18.0 24.0 36.0 48.0 54.0

Voice Rates       : disabled           Bandwidth        : 20 MHz

Signal Strength   : -64  dBm           Connected for    : 75 seconds

Signal to Noise   : 30  dB            Activity Timeout : 328 seconds

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

All clients have a low Signal Strength (below RSSI Threshold -50 dBm), but only clients with MAC 4444.4444.4444 and 7777.7777.7777 is involved by ClientLink. Why?

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

AP#sh int dot11Radio 0 lbf rbf

RBF Table:

Index   Client MAC      Reserved        Valid   Tx BF   Aging   Locked

1       4444.4444.4444          Yes     Yes     Yes     No      No

2       7777.7777.7777          Yes     Yes     Yes     No      No

Everyone's tags (4)
10 REPLIES
Hall of Fame Super Silver

Re: Beamforming troubleshooting on AIR AP1142

This might help, but it's from a WLC. Your using beamforming from an autonomous ap which I have never tried.

Beamforming starts only when the signal from the client falls below these thresholds:
?802.11a clients?RSSI of -60 dBm or weaker
?802.11g clients?RSSI of -50 dBm or weaker


Sent from Cisco Technical Support iPhone App

-Scott
*** Please rate helpful posts ***
New Member

Re: Beamforming troubleshooting on AIR AP1142

Hi, Scott

I updated a subject, the situation changed a little, but all the same it isn't clear.

1111.1111.1111, 2222.2222.2222, 3333.3333.3333 - it 802.11n clients therefore ClientLink isn't used, but all others - is 802.11g clients and only two of them are serviced by ClientLink.

New Member

Re: Beamforming troubleshooting on AIR AP1142

I suppose it would be interesting to know what would happen if you remove one of the clients that do get the ClientLink and see if there will be annother that assumes its role. There are limmitted amount of simultaneous clients that AP will be capable to beamform to and I don't know how many are supported by AP1142 at the same time.

New Member

Re: Beamforming troubleshooting on AIR AP1142

Vlad,

According to this article (http://www.revolutionwifi.net/2010/07/beamforming-clientlink-and.html), maximum number of Beamforming-clients = 15:

"...Cisco's documentation states that a maximum of 15 clients per radio can be supported using ClientLink at the same time..."

...and I saw, on other access point AIR-AP1142N-R-K9 there were at the same time 6 clients at one frequency (2.4GHz).

I have an assumption that ClientLink doesn't service the client, at which "Current Rate: 54.0" (without beamforming), irrespective of values "Signal Strength: ... ". In my case with client 5555.5555.5555 situation disputable as it is on boundary - 51Bdm, though "Current Rate      : 48.0".

Here the white paper on ClientLink 1.0 / 2.0 / 3.0 technologies:

http://www.cisco.com/en/US/prod/collateral/wireless/ps5678/ps11983/at_a_glance_c45-691984.pdf

New Member

Re: Beamforming troubleshooting on AIR AP1142

Anton,

Right. I was thinking that 15 was taken from a particular model of an AP and, perhaps, 1142 may have it different. Just a thought.

New Member

Re: Beamforming troubleshooting on AIR AP1142

Scott,

This technology is by default enabled on WLC & LAP? If yes, that since what release?

Hall of Fame Super Silver

Re: Beamforming troubleshooting on AIR AP1142

It is enabled by default on the WLC starting in v7.0.x. Since then, there is three versions of ClientLink up to v3.0 on the newer AP's.

Sent from Cisco Technical Support iPhone App

-Scott
*** Please rate helpful posts ***
Hall of Fame Super Silver

Re: Beamforming troubleshooting on AIR AP1142

It would be setting that would need to be tested out just to see if it works or not. I know is configurable, but I don't see any docs that show me how to actually check it or what it's suppose to show. Unless you have a doc? I will see if I have the today to test it out, I will just need to dig out an autonomous AP or convert one to autonomous.

Sent from Cisco Technical Support iPhone App

-Scott
*** Please rate helpful posts ***
New Member

Re: Beamforming troubleshooting on AIR AP1142

Hall of Fame Super Silver

Re: Beamforming troubleshooting on AIR AP1142

Yeah... What I want to see is a doc with ClientLink testing on autonomous. To be honest, I never have used it on autonomous only in lightweight and really never had to check it because of dense ap deployments.

Sent from Cisco Technical Support iPhone App

-Scott
*** Please rate helpful posts ***
1629
Views
0
Helpful
10
Replies