Collecting Performance Information for Faults, Such as Packet Loss and Slow Internet Access and File Download
Checking STA Access on the AC
Check the number of STAs connected to the AP.
[AC6605-wlan-view] display station assoc-num ap 1 radio 0 [AC6605-wlan-view] display station assoc-num ap 1 radio 1
If too many STAs connect to an AP, the AP performance will be degraded. In this case, deploy more APs to balance the number of connected STAs.
Check status information about a specified STA, for example, the STA with a low Internet access rate.
[AC6605-wlan-view]display station status sta 04c0-6fc4-3eeb (04c0-6fc4-3eeb sta MAC)
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Station mac-address : 04c0-6fc4-3eeb
Station ip-address : 0.0.0.0
Station gateway : 0.0.0.0
Associated SSID : g00220884_0
Station online time(ddd:hh:mm:ss) : 000:00:00:48
The upstream SNR(dB) : 37.0
The upstream aggregate receive power(dBm) : -73.0
Station connect rate(Mbps) : 12
Station connect channel : 11
Station inactivity time(ddd:hh:mm:ss) : 000:00:00:30
Station current state
Authorized for data transfer : YES
Qos enabled : YES
ERP enabled : YES
HT rates enabled : YES
Power save mode enabled : YES
Auth reference held : No
uAPSD enabled : No
uAPSD triggerable : No
uAPSD SP in progress : No
This is an ATH node : No
WDS workaround req : No
WDS link : No
Station's HT capability : P
Station ERP element(dBm) : 0
Station capabilities : EPSs
Station's RSSI(dB) : 22
Station's Noise(dBm) : -110
Station's radio mode : 11n
Station's AP ID : 3
Station's Radio ID : 0
Station's Authentication Method : WPA2-PSK
Station's Cipher Type : CCMP
Station's User Name : 04c06fc43eeb
Station's Vlan ID : 101
Station's Channel Band-width : 20MHz
Station's asso BSSID : fc48-ef2f-e180
Station's state : Asso with auth
Station's Qos Mode : NULL
Station's HT Mode : HT20
Station's MCS value : 7
Station's Short GI : nonsupport
Station's roam state : No
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Focus on fields highlighted in bold red, including the signal strength, real-time rate at which the AP sends packets to the STA, channel, terminal capability, and the radio mode of the STA's NIC. You can run the display command multiple times to observe changes in the signal strength and packet transmission rate.
Checking Radio Statistics of an AP on the AC
[AC6605-wlan-view]display statistics mac ap-id x radio-id x ----------------------------------------------------------------------- Wireless received frames :9679 Wireless received bytes :762524 Wireless transmitted frames :2028 Wireless transmitted bytes :309351 Wireless transmitted RTS successes :0 Wireless transmitted unicast frames :1220221 Wireless transmitted broadcast frames :2166 Wireless transmitted failure frames :1082782 Wireless received error frames :4527302 Wireless received physical layer error frames :0 Wireless received FCS error frames :4527279 Wireless received MIC error frames :0 Wireless received private key and decrypt fail frames :23 Wireless retry frames :87245 Wireless down-stream MAC error frames :87245 Wireless PER(%) :3 Wireless PER of the last statistic period(%) :3 Wireless channel utilization(%) :0 Wireless received signal strength(dbm) :- Radio receive power(dbm) :- Wireless received unicast frames :13412 Wireless received management frames :5885884 Wireless received control frames :97 Wireless received data frames :9679 Wireless transmitted management frames :1269888 Wireless transmitted control frames :2808 Wireless transmitted data frames :2028 Wireless received maximal signal strength(dbm) :16 Wireless received minimal signal strength(dbm) :16 Wireless received average signal strength(dbm) :16 Wireless port up rate(Kbps) :0 Wireless port down rate(Kbps) :0 Wireless port drop rate(%) :47 Wireless port PS-Poll Frames :35 Wireless port Association Request :22 Wireless port Association Response :22 Wireless port ReAssociation Request :0 Wireless port ReAssociation Response :0 Wireless port Disassociation Frames :13 Wireless port DisAuth Frames :11 -----------------------------------------------------------------------
Focus on fields highlighted in bold red, including packet retransmission, packet error ratio (PER), and channel utilization on air interfaces. You can run the display command multiple times to observe parameter changes.
Using a Channel Scanning Tool to Check Whether There Is Wi-Fi Signal Interference in Surroundings
Use WirelessMon, NetStumbler, or inSSIDer to check whether there is severe co-channel or adjacent-channel interference in surroundings. Usually, the interference signal strength should be lower than -70 dBm. If multiple co-channel or adjacent-channel interference signals of high signal strength exist on the working channel, implement network optimization to avoid channel conflicts.
Some devices, such as Bluetooth devices, microwave ovens, and radars cause certain interference to the AP but cannot be detected by the preceding tools. These devices must be located onsite and dealt with accordingly.
