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