Hi,
Per the title, I've got an issue with 5Ghz clients that have good signal strength because they are sat almost underneath the AP (1832 APs) yet but struggling to get more than 1Mbps throughput. I can see the channel utilisation is over 50% but zero TX/RX, which I assume is a measurement of wifi frames in the channel? We have sub 1ms latency from WLC to the AP on the wired network.
I'm not sure if this has only happened since upgrading to 17.9.4a from 17.9.3 (only done to close IOS XE HTTPS vuln). Out of curiosity, would upgrading WLC and APs cause all APs to change channel or do they remember their last channel and use it post upgrade? Reason for asking is that I have the same issue on multiple APs, which we managed to fix by manually changing the channel.
From what I can understand from the output below, there are no 5Ghz wifi interferers, RSSI is good and SNR is excellent. Does this mean it's likely to be a non-wifi interferer?
We do have Ekahau Pro and a Sidekick, so we can try to identify get to this location and scan the 5Ghz bands to see if we can see an interferer.
MA-WLC-HA#show ap name MGH.1.27.AP24 auto-rf dot11 5ghz
###################################################################
Number of Slots : 2
AP Name : MGH.1.27.AP24
MAC Address : 501c.b0b1.b3a0
Ethernet MAC Address : 501c.b0b0.5368
Slot ID : 1
Radio Type : 802.11ac
Subband Type : All
Noise Information
Noise Profile : Passed
Channel 36 : -102 dBm
Channel 40 : -102 dBm
Channel 44 : -102 dBm
Channel 48 : -102 dBm
Channel 52 : -103 dBm
Channel 56 : -102 dBm
Channel 60 : -103 dBm
Channel 64 : -102 dBm
Channel 100 : -102 dBm
Channel 104 : -102 dBm
Channel 108 : -102 dBm
Channel 112 : -102 dBm
Channel 116 : -100 dBm
Channel 132 : -100 dBm
Channel 136 : -101 dBm
Channel 140 : -101 dBm
Interference Information
Interference Profile : Passed
Channel 36 : -128 dBm @ 0% busy
Channel 40 : -128 dBm @ 0% busy
Channel 44 : -128 dBm @ 0% busy
Channel 48 : -128 dBm @ 0% busy
Channel 52 : -128 dBm @ 0% busy
Channel 56 : -128 dBm @ 0% busy
Channel 60 : -128 dBm @ 0% busy
Channel 64 : -128 dBm @ 0% busy
Channel 100 : -128 dBm @ 0% busy
Channel 104 : -128 dBm @ 0% busy
Channel 108 : -128 dBm @ 0% busy
Channel 112 : -128 dBm @ 0% busy
Channel 116 : -128 dBm @ 0% busy
Channel 132 : -128 dBm @ 0% busy
Channel 136 : -128 dBm @ 0% busy
Channel 140 : -128 dBm @ 0% busy
Rogue Histogram (20/40/80)
Channel 36 : 0/ 0/ 0
Channel 40 : 0/ 0/ 0
Channel 44 : 0/ 0/ 0
Channel 48 : 0/ 0/ 0
Channel 52 : 0/ 0/ 0
Channel 56 : 0/ 0/ 0
Channel 60 : 0/ 0/ 0
Channel 64 : 0/ 0/ 0
Channel 100 : 0/ 0/ 0
Channel 104 : 0/ 0/ 0
Channel 108 : 0/ 0/ 0
Channel 112 : 0/ 0/ 0
Channel 116 : 0/ 0/ 0
Channel 132 : 0/ 0/ 0
Channel 136 : 0/ 0/ 0
Channel 140 : 0/ 0/ 0
Load Information
Load Profile : Passed
Receive Utilization : 0%
Transmit Utilization : 0%
Channel Utilization : 55%
Attached Clients : 7 clients
Coverage Information
Coverage Profile : Passed
Failed Clients : 0 clients
Client Signal Strengths
RSSI -100 dBm : 0 clients
RSSI -92 dBm : 0 clients
RSSI -84 dBm : 0 clients
RSSI -76 dBm : 0 clients
RSSI -68 dBm : 0 clients
RSSI -60 dBm : 2 clients
RSSI -52 dBm : 5 clients
Client Signal to Noise Ratios
SNR 0 dB : 0 clients
SNR 5 dB : 0 clients
SNR 10 dB : 0 clients
SNR 15 dB : 0 clients
SNR 20 dB : 0 clients
SNR 25 dB : 0 clients
SNR 30 dB : 0 clients
SNR 35 dB : 0 clients
SNR 40 dB : 1 clients
SNR 45 dB : 6 clients
Nearby APs
AP 501c.b0b1.9daf slot 1 : -34 dBm on ( 64, 20 MHz) (10.90.160.116)
AP 501c.b0b1.a2ef slot 1 : -53 dBm on (140, 20 MHz) (10.90.160.116)
AP 501c.b0b1.bd2f slot 1 : -54 dBm on ( 36, 20 MHz) (10.90.160.116)
AP 501c.b0b1.9d4f slot 1 : -76 dBm on ( 64, 20 MHz) (10.90.160.116)
AP 501c.b0b1.b78f slot 1 : -79 dBm on (100, 20 MHz) (10.90.160.116)
AP 501c.b0b1.ba0f slot 1 : -82 dBm on ( 48, 20 MHz) (10.90.160.116)
AP 501c.b0b1.bc2f slot 1 : -82 dBm on ( 64, 20 MHz) (10.90.160.116)
Radar Information
Channel changes due to radar : 0
Channel Assignment Information via DCA
Current Channel Average Energy : -86 dBm
Previous Channel Average Energy : -86 dBm
Channel Change Count : 0
Last Channel Change Time : 11/02/2023 23:14:35
Recommended Best Channel : 132
RF Parameter Recommendations
Power Level : 6
RTS/CTS Threshold : 2347
Fragmentation Threshold : 2346
Antenna Pattern : 0
Persistent Interference Devices
Class Type Channel DC (%%) RSSI (dBm) Last Update Time
------------------------- ------- ------ --------- ----------------
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MA-WLC-HA#show ap name MGH.1.27.AP24 neighbor summary
BSSID Channel Channel-width Slot RSSI Last-Heard SSID Neighbour
--------------------------------------------------------------------------------------------------------------------------------------- ----------------------------------------
b095.7582.a5ca 3 40 Mhz 0 -88 11/16/2023 09:32:27 TP-Link_A5CA FALSE
MA-WLC-HA#
Thanks,
Stuart
