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Lenovo N21 802.11ac
04-13-2016 06:34 AM
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.
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Re: Lenovo N21 802.11ac
04-13-2016 06:47 AM
Are you using DFS channels ?
You should take a look at how your AP channel utilization and co-channel interference in the controller dashboard ?
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Victor Fabian
Lead Mobility Architect @WEI
AMFX | ACMX | ACDX | ACCX | CWAP | CWDP | CWNA
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Re: Lenovo N21 802.11ac
04-13-2016 06:56 AM
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
*Answers and views expressed by me on this forum are my own and not necessarily the position of Aruba Networks or Hewlett Packard Enterprise.*
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Re: Lenovo N21 802.11ac
04-13-2016 06:58 AM
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.
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Re: Lenovo N21 802.11ac
04-13-2016 07:00 AM
(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
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Re: Lenovo N21 802.11ac
04-13-2016 07:05 AM
Now type "show ap debug client-table ap-name amsroom612ap-12789"
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Re: Lenovo N21 802.11ac
04-13-2016 07:06 AM
(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)
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Re: Lenovo N21 802.11ac
04-13-2016 07:19 AM
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.
*Answers and views expressed by me on this forum are my own and not necessarily the position of Aruba Networks or Hewlett Packard Enterprise.*
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Re: Lenovo N21 802.11ac
04-13-2016 07:34 AM
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.
*Answers and views expressed by me on this forum are my own and not necessarily the position of Aruba Networks or Hewlett Packard Enterprise.*
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Re: Lenovo N21 802.11ac
04-13-2016 07:36 AM
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
Sent from Outlook for iPhone
Victor Fabian
Lead Mobility Architect @WEI
AMFX | ACMX | ACDX | ACCX | CWAP | CWDP | CWNA
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