Re: AP 3800 support only support 2,4GHz

QuangTran99 · ‎03-21-2020

Hi all,

I just bought four 3800 AP. But they support only 2,4GHz. The speed of clients only 144Mbps.I checked AP and antena, all support both 2,4GHz and 5GHz

How to enable 5GHz ?

3800 model: AIR-AP3802E-S-K9

Four antennas: AIR-ANT2524DW-R

Leo Laohoo · ‎03-21-2020

The only time 2.4 Ghz is disabled automatically is when FRA (flexible radio assignment) is enabled.

marce1000 · ‎03-21-2020

- I think Leo actually means 5Ghz

M.

-- ' 'Good body every evening' ' this sentence was once spotted on a logo at the entrance of a Weight Watchers Club !

Leo Laohoo · ‎03-21-2020

You're right, M.
I misread the thread.
Well, the only time I see 5.0 Ghz disabled is when there is a Regulatory Domain conflict.

QuangTran99 · ‎03-23-2020

Hi @Leo Laohoo and @marce1000 ,

FRA is disabled as below, but only band 2,4GHz. Please advise. Thanks

(Cisco Controller) >show advanced fra

FRA State........................................ Disabled
FRA Operation State.............................. N/A
FRA Sensitivity.................................. low (100%)
FRA Interval..................................... 1 Hour(s)
Last Run....................................... 21 seconds ago
Last Run Time.................................. 0 seconds
Service Priority................................. Coverage

AP Name MAC Address Slot Current Band COF % Sensor % Suggested Mode
-------------------------------- ----------------- ---- -------------- ---------- ---------- -------------------------
VNSGNB09AP 5c:5a:c7:13:ba:00 0 2.4GHz None None (Static)

COF : Coverage Overlap Factor
[] : COF when radio was in 2.4GHz Band

Leo Laohoo · ‎03-23-2020

Post the complete output to the command "sh sysinfo".

QuangTran99 · ‎03-23-2020

@Leo Laohoo

(Cisco Controller) >show sysinfo

Manufacturer's Name.............................. Cisco Systems Inc.
Product Name..................................... Cisco Controller
Product Version.................................. 8.5.151.0

System Name...................................... me-wlc
System Location..................................
System Contact...................................
System ObjectID.................................. 1.3.6.1.4.1.9.1.2373
IP Address....................................... 140.231.150.45
Last Reset....................................... 2: AP Mode Change

System Up Time................................... 0 days 0 hrs 4 mins 56 secs
System Timezone Location......................... (GMT +7:00) Saigon, Hanoi, Bangkok, Jakatar
System Stats Realtime Interval................... 5
System Stats Normal Interval..................... 180

Configured Country............................... VN - Vietnam

State of 802.11b Network......................... Enabled
State of 802.11a Network......................... Enabled
Number of WLANs.................................. 1

--More-- or (q)uit
Number of Active Clients......................... 46

OUI Classification Failure Count................. 27

Memory Current Usage............................. 65
Memory Average Usage............................. 65
CPU Current Usage................................ 4
CPU Average Usage................................ 12

Flash Type....................................... Compact Flash Card
Flash Size....................................... 1073741824

Burned-in MAC Address............................ 78:BC:1A:49:6D:00
Maximum number of APs supported.................. 100
System Nas-Id....................................
WLC MIC Certificate Types........................ SHA1/SHA2

QuangTran99 · ‎03-23-2020

@Leo Laohoo

Should I enable 802.11g for 5GHz using ?

(Cisco Controller) >config 802.11b 11gSupport enable

Changing the 11gSupport will cause all the APs to reboot when you enable 802.11b network.
Are you sure you want to continue? (y/n)

Or : enable 802.11ac, I just noticed that 3700s use 802.11ac for 5GHz connection.

(Cisco Controller) >config 802.11a 11acSupport enable

Unable to modify while 802.11a network is operational.

Leo Laohoo · ‎03-23-2020

Post the complete output to the follwoing commands:

sh advanced 802.11a txpower
sh advanced 802.11a channel

Are the SSID configured for 2.4 Ghz only or all radios?

QuangTran99 · ‎03-23-2020

@Leo Laohoo

(Cisco Controller) >show advanced 802.11a txpower

Leader Automatic Transmit Power Assignment

Transmit Power Assignment Mode................. AUTO

Transmit Power Update Interval................. 600 seconds

Transmit Power Threshold....................... -70 dBm

Transmit Power Neighbor Count.................. 3 APs

WLAN Aware TPC................................. Disabled

Min Transmit Power............................. -10 dBm

Max Transmit Power............................. 30 dBm

Update Contribution

Noise........................................ Enable

Interference................................. Enable

Load......................................... Disable

Device Aware................................. Disable

Transmit Power Assignment Leader............... me-wlc (140.231.150.45) (::)

Last Run....................................... 187 seconds ago

Last Run Time.................................. 0 seconds

TPC Mode....................................... Version 1 Channel Aware NO

AP Name Channel TxPower Allowed Power Levels

--More-- or (q)uit

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

VNSGNB04AP *100 *1/6 (17 dBm) [17/14/11/8/5/2/2/2]

VNSGNB09AP 36* *1/6 (16 dBm) [16/13/10/7/4/2/0/0]

VNSGNB03AP (64,60,52,56)* *1/6 (17 dBm) [17/14/11/8/5/2/2/2]

VNSGNB07AP *100 *1/6 (17 dBm) [17/14/11/8/5/2/2/2]

VNSGNB06AP *36 *1/6 (17 dBm) [17/14/11/8/5/2/2/2]

(Cisco Controller) >show advanced 802.11a channel

Leader Automatic Channel Assignment
Channel Assignment Mode........................ AUTO
Channel Update Interval........................ 600 seconds
Anchor time (Hour of the day).................. 0
Update Contribution
Noise........................................ Enable
Interference................................. Enable
Load......................................... Disable
Device Aware................................. Disable
CleanAir Event-driven RRM option............... Enabled
CleanAir Event-driven RRM sensitivity.......... Medium
CleanAir Event-driven RRM Rogue Option......... Disabled
Channel Assignment Leader...................... me-wlc (140.231.150.45) (::)
Last Run....................................... 261 seconds ago
Last Run Time.................................. 0 seconds
DCA Sensitivity Level.......................... MEDIUM (15 dB)
DCA 802.11n/ac Channel Width................... BEST
DBS Max Channel Width.......................... 80 MHz
DCA Minimum Energy Limit....................... -95 dBm
Channel Energy Levels
Minimum...................................... -71 dBm

--More-- or (q)uit
Average...................................... -71 dBm
Maximum...................................... -71 dBm
Channel Dwell Times
Minimum...................................... 0 days, 03 h 49 m 44 s
Average...................................... 0 days, 03 h 49 m 51 s
Maximum...................................... 0 days, 03 h 50 m 07 s
802.11a 5 GHz Auto-RF Channel List
Allowed Channel List......................... 36,40,44,48,52,56,60,64,100,
104,108,112,116,120,124,128,
132,136,140,149,153,157,161
Unused Channel List.......................... 165
DCA Outdoor AP option.......................... Disabled

Leo Laohoo · ‎03-23-2020

VNSGNB04AP                       *100       *1/6 (17 dBm) [17/14/11/8/5/2/2/2]
VNSGNB09AP                       36*        *1/6 (16 dBm) [16/13/10/7/4/2/0/0]
VNSGNB03AP                       (64,60,52,56)* *1/6 (17 dBm) [17/14/11/8/5/2/2/2]
VNSGNB07AP                       *100       *1/6 (17 dBm) [17/14/11/8/5/2/2/2]
VNSGNB06AP                       *36        *1/6 (17 dBm) [17/14/11/8/5/2/2/2]

Any of the AP in question in this list?

Allowed Channel List......................... 36,40,44,48,52,56,60,64,100,104,108,112,116,120,124,128,132,136,140,149,153,157,161

Whao, are you even allowed to use UNII-2E in VN?

QuangTran99 · ‎03-23-2020

Hi @Leo Laohoo ,

Only VNSGNB09AP is 3800 which 5GHz doesn't work. Others are 3700s which work good for 5GHz.

I am new to AP, and actually don't know about UNII-2E, googling now.

Leo Laohoo · ‎03-23-2020

@QuangTran99 wrote:

Only VNSGNB09AP is 3800 which 5GHz doesn't work.

According to the output provided, the AP VNSGNB09AP is operating on Channel 36 and a radio power of 16 dBm.

@QuangTran99 wrote:

No 5GHz clients for AP 3800

So what actually is the problem? No 5.0 Ghz clients or no 5.0 Ghz radio?

QuangTran99 · ‎03-23-2020

@Leo Laohoo

3800 is serving only 2,4GHz with speed 144Mbps and no 5GHz clients

Leo Laohoo · ‎03-25-2020

Ok, let's do a test:
1. Disable 2.4 Ghz across the network.
2. Disable 5.0 Ghz across the network.
3. Enable 5.0 Ghz on VNSGNB09AP ONLY.