Extreme Networks

ict25 · ‎01-30-2020

Hello,

At our school, we are using an aerohivenetwork. I'm getting a lot of complaints about poor network speeds and a lot of connection errors.

The past weeks I was searching and reading the Aerohive community. I've learned that we had a lot of CRC errors and that one of the reasons could be 'high interference'

In one building (two floors) I'm having 5 AP 130. They are placed in the hallways. I’ve selected manually the channels on 2.4 ghz.

This is the channellayout:

Ground floor

AP1 AP3 AP2

1 11 6

firstfloor

AP4 AP5

6 1

I’ve lowered the transmissionpower to 8-10 db. The CRC rate has dropped but still high (I had sometimes CRCrates of 100!). The error ‘wifi0: A high interference alert was raised’ is still popping up.

What can I do to make the aerohive wireless network preform better?

I copy past the output of some CLI commands …

wifi0: High collision; wifi1: Fair;

wifi0(5) ACSP neighbor list (15/384):

Bssid Mode Ssid/Hive Chan Rssi(dBm) Aerohive AP CU CRC STA Channel-width VID NVID

885b:dd5c:1094 Access PIBO-LEERLING 1 -56 yes 14 18 1 20 20 1

885b:dd5c:1095 Access PIBO 1 -56 yes 14 27 0 20 20 1

885b:dd5c:1096 Access PIBO-DIGIBORDEN 1 -56 yes 14 27 0 20 20 1

885b:dd5c:1097 Access CAMPUS 1 -56 yes 14 27 0 20 20 1

885b:dd5c:1098 Access PIBO-VZW 1 -56 yes 14 27 0 20 20 1

c867:5e5c:1618 Access PIBO-VZW 6 -72 yes 48 98 1 20 20 1

885b:dd5c:8954 Access PIBO-LEERLING 6 -76 yes 27 42 10 20 20 1

885b:dd5c:8955 Access PIBO 6 -75 yes 49 94 0 20 20 1

c867:5e5c:1614 Access PIBO-LEERLING 6 -72 yes 18 40 16 20 20 1

c867:5e5c:1615 Access PIBO 6 -72 yes 48 98 0 20 20 1

c867:5e5c:1616 Access PIBO-DIGIBORDEN 6 -72 yes 48 98 2 20 20 1

c867:5e5c:1617 Access CAMPUS 6 -72 yes 48 98 0 20 20 1

885b:dd5c:8956 Access PIBO-DIGIBORDEN 6 -76 yes 49 94 3 20 20 1

885b:dd5c:8957 Access CAMPUS 6 -76 yes 49 94 0 20 20 1

885b:dd5c:8958 Access PIBO-VZW 6 -76 yes 27 42 0 20 20 1

sderikonja1 · ‎02-09-2020

2.4GHz, hallways and a school setting. You are going to have a hard time achieving low CRC and retries with those three combined.

ict25 · ‎01-30-2020

show radio profile radio_ng_ac0_PIBO

AC=access category; be=best-effort; bg=background; vi=video; vo=voice;

AIFS=Arbitration Inter-Frame space; Txoplimit=transmission opportunity limit;

WMM=Wi-Fi Multimedia; ACK=acknowledgment; min=minimum; max=maximum;

BGSCAN=background scan; PS=Power save; LB=load balance;

A-MPDU=Aggregate MAC protocol data unit; DFS=Dynamic Frequency Selection;

Radio profile=radio_ng_ac0_PIBO;

Phy-mode=11ac; Short preamble mode=enabled;

DFS=enabled; DFS static-channel restore=disabled; A-MPDU=enabled; Short guard interval=enabled;

Channel width=40MHz; Deny client=none;

Transmit chain=static 2; Receive chain=static 2;

Transmit rate=auto; Beacon period=100; Max clients number=150;

AC=be; WMM min CW=4; max CW=6; AIFS=3; txoplimit=0; No ACK mode=disabled;

AC=bg; WMM min CW=4; max CW=10; AIFS=7; txoplimit=0; No ACK mode=disabled;

AC=vi; WMM min CW=3; max CW=4; AIFS=1; txoplimit=3008; No ACK mode=disabled;

AC=vo; WMM min CW=2; max CW=3; AIFS=1; txoplimit=1504; No ACK mode=disabled;

ACSP use last selection=disabled;

AP channel switch=user configure;

Channel switch start time=01:00; End time=04:00; Station number=0;

Backhaul channel switch=once only;

Interference-Switch:

Interference threshold=25%;

CRC error threshold=50%;

Max ACSP tx power=18dBm;

Power floor=8dBm;Power max drop=18dB;

BGSCAN allow=enabled; BGSCAN during voice=disabled;

BGSCAN interval=60 minutes;

BGSCAN with client=enabled; BGSCAN with PS client=disabled;

Backhaul failover=enable; Trigger time=2; Lock static channel=disabled

Interference map=enabled; Short term interval=5 minutes; Channel utilization threshold=50%; CRC error threshold=50%;

Benchmark phy=11b; Rate=11M; Success=60%; Usage=50%;

Benchmark phy=11b; Rate=5.5M; Success=70%; Usage=50%;

Benchmark phy=11g; Rate=36M; Success=70%; Usage=50%;

Benchmark phy=11g; Rate=24M; Success=80%; Usage=50%;

Benchmark phy=11a; Rate=36M; Success=70%; Usage=50%;

Benchmark phy=11a; Rate=24M; Success=80%; Usage=50%;

Benchmark phy=11n; Rate=mcs4/2; Success=80%; Usage=50%;

Benchmark phy=11n; Rate=54M; Success=70%; Usage=50%;

Benchmark phy=11ac; Rate=mcs2/2; Success=80%; Usage=50%;

Benchmark phy=11ac; Rate=54M; Success=70%; Usage=50%;

High density=enabled;

Safety net=enabled; Band steering=enabled; Broadcast probe suppress=disabled;

High density continuous probe suppress=enabled; Load balance=disabled; Weak SNR suppress=disabled;

OUI(s) enabled for broadcast probe suppression:

04:46:65

5c:0a:5b

5c:f8:a1

60:21:c0

Band steering: prefer 5G mode, suppression limit=5;

Weak SNR threshold=15 dB; Safety net timeout=15 seconds;

LB hold time=60 seconds; LB station airtime limit=4%;

LB interference utilization=40%;LB crc error limit=30%;

LB neighbor load info query interval=60s;

HDD mgmt tx rate=high;

Detect bssid spoofing=disabled;

Tx beamforming=disabled;

Frameburst=disabled;

A-MSDU=disabled,A-MPDU limit=1048575,A-MPDU 11n limit=1048575;

Bind interfaces=Wifi1;Presence=disabled;Trap interval=120;Aggr interval=120;Aging time=120;

Sensor dwell time=1200;Channel list=all;

Dynamic channel width=disabled;

ict25 · ‎01-30-2020

-- show int wifi0 _count --

show int wifi0 _count

22976321 rx frames

20345938 rx data frames

19939309 rx unicast data frames

331412 rx multicast data frames

75217 rx broadcast data frames

2500680 rx management frames

129703 rx control frames

0 rx unknown frames

112600 rx BAR (Block Ack Request) frames

22976321 11n rx frames

0 rx chip keyix errors

0 rx chip antenna errors

0 rx chip short frame errors

0 rx ieee queue depth

2683846 rx Retries

13% rx retry rate

21269574 rx CRC errors

48% rx CRC rate

309 rx frame errors other than CRC

0 hw FIFO overrun

236 decryption failed

0 MIC failure

67 rx frames dropped

67 frame too short

0 frame too large

0 frame in other mode

0 rx dropped because no skbuff

50915652 tx data frames

37889776 tx unicast data frames

5822630 tx multicast data frames

7203246 tx broadcast data frames

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

33876595 tx WMM best effort data frames

16833 tx WMM background data frames

17018506 tx WMM video data frames

3718 tx WMM voice data frames

7341287 tx management frames other than beacon

83678901 tx beacon frames

0 tx beacon frame stucks

0 PCI errors

1169359 tx BAR (Block Ack Request) frames

7269387 tx aggregated completions

0 tx BAR (Block Ack Request) frames dropped

0 invalid tx rate index

0 invalid rx rate index

1826878 tx retries

289 tx RTS failures

1826589 tx retries

3% tx retry rate

4% unicast data tx retry rate

0 tx retries of sub frames

0 tx frames with no ack marked

1301252 tx frames with rts enabled

0 tx frames with cts enabled

723832 tx frames with short preamble

1014110 tx frames with an alternate rate

1301252 tx frames with protection

202577 tx frames dropped

202577 no tx buffer (data)

0 no tx buffer (mgmt)

1707868 tx frame errors

1707868 too many hw retries

0 hw FIFO underrun

0 transmit filtered by hw

0 tx transmit queue full

1024 tx available buffers

0 exceeded txop

0 exceeded tx timer

2528238 tx frames succeed

70176 tx frames failed

27 rx rssi from histogram

0 no skbuff available for beacon

0 switched from HT40 to HT20

0 switched from HT20 to HT40

585609 channel switches

0 AMRP one-way neighbor timeout detected

667 interference raise alert

666 interference clear alert

0 band steering suppress

0 load balance suppress

0 weak snr suppress

0 safety net bypassed suppress

show int wifi0 _count

22984471 rx frames

20353627 rx data frames

19946764 rx unicast data frames

331598 rx multicast data frames

75265 rx broadcast data frames

2501141 rx management frames

129703 rx control frames

0 rx unknown frames

112600 rx BAR (Block Ack Request) frames

22984471 11n rx frames

0 rx chip keyix errors

0 rx chip antenna errors

0 rx chip short frame errors

0 rx ieee queue depth

2684897 rx Retries

13% rx retry rate

21269884 rx CRC errors

48% rx CRC rate

309 rx frame errors other than CRC

0 hw FIFO overrun

236 decryption failed

0 MIC failure

67 rx frames dropped

67 frame too short

0 frame too large

0 frame in other mode

0 rx dropped because no skbuff

50939995 tx data frames

37909227 tx unicast data frames

5825126 tx multicast data frames

7205642 tx broadcast data frames

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

33891286 tx WMM best effort data frames

16834 tx WMM background data frames

17028157 tx WMM video data frames

3718 tx WMM voice data frames

7342846 tx management frames other than beacon

83682807 tx beacon frames

0 tx beacon frame stucks

0 PCI errors

1169377 tx BAR (Block Ack Request) frames

7273166 tx aggregated completions

0 tx BAR (Block Ack Request) frames dropped

0 invalid tx rate index

0 invalid rx rate index

1827144 tx retries

289 tx RTS failures

1826855 tx retries

3% tx retry rate

4% unicast data tx retry rate

0 tx retries of sub frames

0 tx frames with no ack marked

1302296 tx frames with rts enabled

0 tx frames with cts enabled

724204 tx frames with short preamble

1014112 tx frames with an alternate rate

1302296 tx frames with protection

202654 tx frames dropped

202654 no tx buffer (data)