What does phy_cap mean in AP association table?

MVP Expert
MVP Expert
Q:

What does phy_cap mean in AP association table?



A:

From AOS 6.5, we have included a new field in AP association table "phy_cap". This tells us the actual PHY capability of the client.

 

Example:

1. Connected a MacBook to AP-225.

 

(Master-7240) #show ap active 

Active AP Table
---------------
Name   Group  IP Address    11g Clients  11g Ch/EIRP/MaxEIRP  11a Clients  11a Ch/EIRP/MaxEIRP  AP Type  Flags  Uptime   Outer IP
----   -----  ----------    -----------  -------------------  -----------  -------------------  -------  -----  ------   --------
test   test   172.16.0.149  0                                 1            AP:VHT:60E/8.9/23.0  325      Ea     46m:16s  N/A
AP225  test   172.16.0.146  0                                 0            AP:VHT:52E/7.5/23.0  225      Ea     3m:3s    N/A        <<<< AP is broadcasting in 80Mhz channel width

 


2. In the below output, client is associated to AP with Phy of a-VHT-80sgi-2ss and its PHY capability shows a-VHT-80sgi-2ss.

 

(Master-7240) #show ap assoc

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, M: Mu beam formee, 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)  phy_cap
----   -----              ---                ----  -----  ---  -----  -----        -------  ---------  ---              -----------  ---------  -----  ----------------------  -------
AP225  18:64:72:f0:84:f0  78:4f:43:a0:94:55  y     y      1    10     test-psk-km  100      0x1000e    a-VHT-80sgi-2ss  1m:30s       1          WAB    0/0                     a-VHT-80sgi-2ss
Num Clients:1

 

3. Now, we disable 80Mhz channel bonding in a band.

 

(Master-7240) #show audit-trail 1 

Apr  4 12:23:24  webui[3877]: USER:admin@100.100.100.101 COMMAND:<rf arm-profile "test" no 80MHz-support > -- command executed successfully   

 

4. The AP is broadcasting in 40Mhz channel width as shown below;

 

(Master-7240) #show ap active 

Active AP Table
---------------
Name   Group  IP Address    11g Clients  11g Ch/EIRP/MaxEIRP  11a Clients  11a Ch/EIRP/MaxEIRP  AP Type  Flags  Uptime  Outer IP
----   -----  ----------    -----------  -------------------  -----------  -------------------  -------  -----  ------  --------
AP225  test   172.16.0.146  0                                 1            AP:VHT:36+/7.5/23.0  225      Ea     9m:44s  N/A

 

5. In the output below, we see the client is currently associated at PHY a-VHT-40sgi-2ss. However, we could get the actual PHY capability of the client under phy_cap which shows a-VHT-80sgi-2ss.

 

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)  phy_cap
----   -----              ---                ----  -----  ---  -----  -----        -------  ---------  ---              -----------  ---------  -----  ----------------------  -------
AP225  18:64:72:f0:84:f0  78:4f:43:a0:94:55  y     y      1    10     test-psk-km  100      0x1000e    a-VHT-40sgi-2ss  49s          1          WAB    0/0                     a-VHT-80sgi-2ss
Num Clients:1

 

 

 

Version history
Revision #:
2 of 2
Last update:
‎02-11-2019 11:40 AM
Updated by:
 
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