Lenovo N21 802.11ac

[morrisch@alliancecityschools.org]

We have a number of Lenovo N21 Chromebooks. 802.11ac during our online testing, devices which are all in the same room as the AP they are connnected to, AP-215.  Their speeds are around 6-7 MB.  Any thoughts as to why they top out there?

The devices that aren't in the screenshot below are different devices models and only capable of N 40 MHz.

[Victor Fabian]

Do you have other APs in the vicinity using 5 Ghz ?

Are you using DFS channels ?

You should take a look at how your AP channel utilization and co-channel interference in the controller dashboard ?

Sent from Outlook for iPhone

[cjoseph]

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morrisch@alliancecityschools.org wrote:

We have a number of Lenovo N21 Chromebooks. 802.11ac during our online testing, devices which are all in the same room as the AP they are connnected to, AP-215.  Their speeds are around 6-7 MB.  Any thoughts as to why they top out there?

The devices that aren't in the screenshot below are different devices models and only capable of N 40 MHz.

---

Type "show ap association client-mac <mac address of one of the chromebooks>" and paste in the output here

[morrisch@alliancecityschools.org]

Here is what I see in the Dashboard where the devices are connected.  To me nothing looks too out of the ordinary.  Especially the AP with 29 devices connected.

I'm not sure I'm familiar with DFS Channels or how to enable or configure it.

[morrisch@alliancecityschools.org]

(acsaruba7210) #show ap association client-mac 10:4a:7d:a0:32:55

The phy column shows client's operational capabilities for current association

Flags: A: Active, B: Band Steerable, H: Hotspot(802.11u) client, K: 802.11K client, R: 802.11R client, W: WMM client, w: 802.11w client V: 802.11v BSS trans capable

PHY Details: HT   : High throughput;      20: 20MHz;  40: 40MHz; t: turbo-rates (256-QAM)

             VHT  : Very High throughput; 80: 80MHz; 160: 160MHz; 80p80: 80MHz + 80MHz

             <n>ss: <n> spatial streams

Association Table

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

Name                bssid              mac                auth  assoc  aid  l-int  essid              vlan-id  tunnel-id  phy              assoc. time  num assoc  Flags  Band steer moves (T/S)

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

amsroom612ap-12789  04:bd:88:67:97:b1  10:4a:7d:a0:32:55  y     y      29   10     ACS_Wireless_WPA2  2        0x1067e    a-VHT-80sgi-2ss  1h:25m:12s   1          WAB    0/0

10:4a:7d:a0:32:55-04:bd:88:67:97:b1 Stats

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

Parameter                            Value

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

Channel                              40

Channel Frame Retry Rate(%)          0

Channel Frame Low Speed Rate(%)      0

Channel Frame Non Unicast Rate(%)    0

Channel Frame Fragmentation Rate(%)  0

Channel Frame Error Rate(%)          0

Channel Bandwidth Rate(kbps)         109

Channel Noise                        97

Client Frame Retry Rate(%)           0

Client Frame Low Speed Rate(%)       0

Client Frame Non Unicast Rate(%)     0

Client Frame Fragmentation Rate(%)   0

Client Frame Receive Error Rate(%)   0

Client Bandwidth Rate(kbps)          0

Client Tx Packets                    15205

Client Rx Packets                    3972

Client Tx Bytes                      2365255

Client Rx Bytes                      2228742

Client SNR                           33

A2c_SM SeqNum, Old SeqNums           208 0

[cjoseph]

Now type "show ap debug client-table ap-name  amsroom612ap-12789"
 

[morrisch@alliancecityschools.org]

(acsaruba7210) # show ap debug client-table ap-name  amsroom612ap-12789

Client Table

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

MAC                ESSID              BSSID              Assoc_State  HT_State     AID   PS_State    UAPSD            Tx_Pkts  Rx_Pkts  PS_Qlen  Tx_Retries  Tx_Rate  Rx_Rate  Last_ACK_SNR  Last_Rx_SNR  TX_Chains  Tx_Timestamp              Rx_Timestamp              MFP Status (C,R)  Idle time  Client health (C/R)

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

10:4a:7d:a0:74:54  ACS_Wireless_WPA2  04:bd:88:67:97:b1  Associated   cWvSsEBbR    0x17  Power-save  (0,0,0,0,N/A,0)  4632     4501     0        206         585      6        37            38           3[0x7]     Wed Apr 13 10:06:09 2016  Wed Apr 13 10:06:09 2016  (0,0)             13         97/2

c0:1a:da:c2:33:e2  ACS_Wireless_WPA2  04:bd:88:67:97:b1  Associated   WQSs         0x6   Power-save  (0,0,0,0,N/A,0)  182      631      0        26          150      150      40            37           3[0x7]     Wed Apr 13 10:05:27 2016  Wed Apr 13 10:05:27 2016  (0,0)             55         82/2

10:4a:7d:a1:07:fc  ACS_Wireless_WPA2  04:bd:88:67:97:b1  Associated   cWvSsEBbR    0x19  Power-save  (0,0,0,0,N/A,0)  1675     5115     0        213         650      6        44            44           3[0x7]     Wed Apr 13 10:06:09 2016  Wed Apr 13 10:06:09 2016  (0,0)             13         69/2

10:4a:7d:ae:63:75  ACS_Wireless_WPA2  04:bd:88:67:97:b1  Associated   cWvSsEBbR    0x23  Power-save  (0,0,0,0,N/A,0)  4450     6937     0        415         585      6        40            40           3[0x7]     Wed Apr 13 10:06:20 2016  Wed Apr 13 10:06:20 2016  (0,0)             2          92/2

10:4a:7d:cb:d3:06  ACS_Wireless_WPA2  04:bd:88:67:97:b1  Associated   cWvSsEBbR    0x26  Power-save  (0,0,0,0,N/A,0)  5801     8150     0        506         585      6        38            37           3[0x7]     Wed Apr 13 10:06:19 2016  Wed Apr 13 10:06:19 2016  (0,0)             3          71/2

10:4a:7d:cb:d3:56  ACS_Wireless_WPA2  04:bd:88:67:97:b1  Associated   cWvSsEBbR    0x24  Awake       (0,0,0,0,N/A,0)  6121     8636     0        558         520      12       8             33           3[0x7]     Wed Apr 13 10:06:20 2016  Wed Apr 13 10:05:24 2016  (0,0)             58         55/2

10:4a:7d:cc:16:ef  ACS_Wireless_WPA2  04:bd:88:67:97:b1  Associated   cWvSsEBbR    0x1f  Power-save  (0,0,0,0,N/A,0)  5760     7989     0        552         650      6        35            36           3[0x7]     Wed Apr 13 10:06:07 2016  Wed Apr 13 10:06:08 2016  (0,0)             15         93/2

10:4a:7d:a0:e6:5f  ACS_Wireless_WPA2  04:bd:88:67:97:b1  Associated   cWvSsEBbR    0x11  Power-save  (0,0,0,0,N/A,0)  6654     10048    0        581         650      24       44            45           3[0x7]     Wed Apr 13 10:06:19 2016  Wed Apr 13 10:06:19 2016  (0,0)             3          78/2

10:4a:7d:af:93:e4  ACS_Wireless_WPA2  04:bd:88:67:97:b1  Associated   cWvSsEBbR    0xf   Power-save  (0,0,0,0,N/A,0)  6587     10142    0        508         650      6        41            45           3[0x7]     Wed Apr 13 10:06:10 2016  Wed Apr 13 10:06:10 2016  (0,0)             12         85/2

10:4a:7d:a1:11:70  ACS_Wireless_WPA2  04:bd:88:67:97:b1  Associated   cWvSsEBbR    0xb   Power-save  (0,0,0,0,N/A,0)  9722     12630    0        526         650      6        46            46           3[0x7]     Wed Apr 13 10:06:16 2016  Wed Apr 13 10:06:16 2016  (0,0)             6          98/2

48:d7:05:cf:5d:09  ACS_Wireless_WPA2  04:bd:88:67:97:b1  Associated   cAWvSsEeBbM  0x7   Awake       (0,0,0,0,N/A,0)  495834   440774   0        1286        866      866      51            52           3[0x7]     Wed Apr 13 10:06:21 2016  Wed Apr 13 10:06:22 2016  (0,0)             0          100/2

a4:d1:d2:5c:87:c6  ACS_Wireless_WPA2  04:bd:88:67:97:b1  Associated   QM           0x5   Power-save  (0,0,0,0,N/A,0)  2277     5917     0        144         65       39       47            47           3[0x7]     Wed Apr 13 10:05:47 2016  Wed Apr 13 10:05:47 2016  (0,0)             35         100/2

a4:d1:d2:64:5f:2b  ACS_Wireless_WPA2  04:bd:88:67:97:b1  Associated   QM           0x4   Power-save  (0,0,0,0,N/A,0)  3673     22179    0        272         65       65       46            46           3[0x7]     Wed Apr 13 10:05:49 2016  Wed Apr 13 10:05:50 2016  (0,0)             32         100/2

a4:d1:d2:5c:89:2b  ACS_Wireless_WPA2  04:bd:88:67:97:b1  Associated   QM           0x3   Power-save  (0,0,0,0,N/A,0)  2810     6419     0        214         65       65       45            43           3[0x7]     Wed Apr 13 10:04:51 2016  Wed Apr 13 10:04:53 2016  (0,0)             89         100/2

b8:c7:5d:f3:00:24  ACS_Wireless_WPA2  04:bd:88:67:97:b1  Associated   QM           0x2   Power-save  (0,0,0,0,N/A,0)  3643     7831     0        25          65       52       39            39           3[0x7]     Wed Apr 13 10:04:51 2016  Wed Apr 13 10:04:53 2016  (0,0)             89         100/2

a4:d1:d2:64:5c:b2  ACS_Wireless_WPA2  04:bd:88:67:97:b1  Associated   QM           0x1   Power-save  (0,0,0,0,N/A,0)  19267    28268    0        463         58       65       44            43           3[0x7]     Wed Apr 13 10:05:47 2016  Wed Apr 13 10:05:58 2016  (0,0)             24         91/2

Num of associated clients: 16

UAPSD:(VO,VI,BK,BE,Max SP,Q Len)

HT  Flags: A - LDPC Coding; W - 40MHz; S - Short GI 40; s - Short GI 20

          D - Delayed BA; G - Greenfield; R - Dynamic SM PS

          Q - Static SM PS; N - A-MPDU disabled; B - TX STBC

          b - RX STBC; M - Max A-MSDU; I - HT40 Intolerant; t turbo-rates (256-QAM)

VHT Flags: C - 160MHz; c - 80MHz;  V - Short GI 160; v - Short GI 80

                    E - Beamformee; e - Beamformer

HT_State shows client's original capabilities (not operational capabilities)

[cjoseph]

Unfortunately, that client moved away from that access point so the data is not reflected in your output.  The "speed" is just a snaphot in time and quite a few of the devices are in Power Save mode, so their "speed" will not indicate a device that is actually sending tons of data.  You should get ahold of one of those devices and do a test in your lab to make sure things are okay.  The "speed" number indicates a snapshot of the device rate, and is only a single component of what is used to troubleshoot devices.  It is not the overall speed over the lifetime of a device.

[cjoseph]

In addition, that specific client is not sending any traffic: "Client Bandwidth Rate = 0"  Client Retries, Client Error rate are also 0, so even though the client is not sending traffic, it is also not having any specific issues:

Please also know that the statistics in the "show ap association client-mac" command is updated at most once/minute, but the lack of errors means that there are no wifi issues seen on this association.

[Victor Fabian]

Based on the screenshot you provided overall the RF environment looks good .

Here's more detail information about 802.11ac RF optimization :
http://community.arubanetworks.com/aruba/attachments/aruba/Aruba-VRDs/28/1/RF%20and%20Roaming%20Optimization%20for%20Aruba%20802.11ac%20Networks.pdf

How to configure and enable DFS channels :
http://community.arubanetworks.com/t5/Controller-Based-WLANs/What-is-Dynamic-Frequency-Selection-DFS-How-to-Enable-it-What/ta-p/179170


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