STA Service Exception

STA online failure

Confirm fault information.

• Determine the area and scope where STAs fail to go online.
• Determine the period when STAs fail to go online, for example, 8:00 a.m. to 9:00 a.m.
• Check the types and versions of the STAs that fail to go online, for example, scanner, mobile phone, PC, tablet, and iOS or Android version.
• Determine the involved APs.
• Check the AP coverage mode at the service exception point, for example, one AP for each room or AP deployment in corridors to cover indoor rooms.

Collect information.

1. Run the following commands on the AC to check the MAC addresses of the STAs that cannot go online.

   display vap-profile all, display station offline-record { all | sta-mac sta-mac-address }, display station online-fail-record { sta-mac sta-mac-address | ap-id y }, and display wired-port-profile { all | name xxxx }

2. Enable the trace function on the AC to collect trace information.

   [AC] display trace object //Run this command before the trace operation to ensure that no other AP or STA is traced.

   [AC] trace object mac-address sta-mac-address

   [AC] trace enable

   After the trace operation is complete, disable the trace function.

   [AC] undo trace enable

   [AC] undo trace object all

3. Run the station-trace command to enable the whole-process recording of key packets between the device and STAs.
   • AC:

     [AC-diagnose] station-trace sta-mac sta-mac-address //To stop information display, run the undo station-trace all command.

   • Fat AP:

     [FAT-diagnose] station-trace key-protocol station sta-mac-address //To stop information display, run the undo station-trace key-protocol all command.

     [FAT-diagnose] station-trace assoc station sta-mac-address //To stop information display, run the undo station-trace assoc all command.

4. Collect kernel logs of the AP.

   [AP-diagnose] display kernel-logbuf record-range { 1 | 2 | 3 }

STA going-offline

Confirm fault information.

• Determine the area and scope where STAs go offline unexpectedly.
• Determine the period when STAs go offline unexpectedly, for example, 8:00 a.m. to 9:00 a.m.
• Check the types and versions of the STAs that go offline unexpectedly, for example, scanner, mobile phone, PC, tablet, and iOS or Android version.
• Determine the involved APs and AP installation positions, for example, distance between APs, whether there are partition plates, and whether APs are installed in corridors to cover indoor areas.
• Check the signal strength at the service exception point, including the RSSIs of STAs and APs.

Collect information.

1. Run the following commands on the AC to check the MAC addresses of the two STAs that go offline unexpectedly.

   display station offline-record { all | sta-mac sta-mac-address }, display station online-fail-record { sta-mac sta-mac-address | ap-id y }, display radio { all | ap-id x }, display channel switch-record all, display station steer-history | include sta-mac-address, and display station roam-track sta-mac sta-mac-address

2. Enable the trace function on the AC to collect trace information.

   [AC] display trace object //Run this command before the trace operation to ensure that no other AP or STA is traced.

   [AC] trace object mac-address sta-mac-address

   [AC] trace enable

   After the trace operation is complete, disable the trace function.

   [AC] undo trace enable

   [AC] undo trace object all

3. Run the station-trace command to enable the whole-process recording of key packets between the device and STAs.
   • AC:

     [AC-diagnose] station-trace sta-mac sta-mac-address //To stop information display, run the undo station-trace all command.

   • Fat AP:

     [FAT-diagnose] station-trace key-protocol station sta-mac-address //To stop information display, run the undo station-trace key-protocol all command.

     [FAT-diagnose] station-trace assoc station sta-mac-address //To stop information display, run the undo station-trace assoc all command.

4. For STAs that frequently go offline, you are advised to collect STA association tracks and AP kernel logs.
   • V200R019C00 and earlier versions:

     [AP-diagnose] display wifi sta-trace-info //Record the time point and MAC address information. It is required that logs be collected within 10 minutes after a fault occurs to prevent logs from being overwritten.

     [AP-diagnose] display kernel-logbuf record-range { 1 | 2 | 3 }

     [AP-diagnose] display wifi sta-statistics sta sta-mac-address

     [AP-diagnose] display wifi radio-statistics radio radio-id

   • V200R019C10 and later versions:

     [AP-diagnose] display umac sta-trace-info //Record the time point and MAC address information. It is required that logs be collected within 10 minutes after a fault occurs to prevent logs from being overwritten.

     [AP-diagnose] display kernel-logbuf record-range { 1 | 2 | 3 }

     [AP-diagnose] display lmac sta-statistics sta sta-mac-address

     [AP-diagnose] display lmac radio-tx-statistics radio radio-id

     [AP-diagnose] display lmac radio-rx-statistics radio radio-id

STA packet loss and high delay

Confirm fault information.

• Check whether the configuration is changed or the network is adjusted.
• Check whether packet loss or delay occurs only on the wireless or wired network. If packet loss or delay occurs on the wired network, check the wired network first.
• Check the areas with packet loss (high delay) and check whether there are differences between different STAs.
• Obtain the AP installation positions or the AP distribution diagram to check whether there are coverage holes or inappropriate installation positions.

Collect information.

1. Collect radio information.

   Run the following commands on the AC:

   display station all | include sta-mac-address

   display radio ap-id

   display ap traffic statistics wireless ap-id radio y ssid XXX

   display ap radio-reload-record all //In the diagnostic view, check the reloading records after an AP radio exception occurs.

   Run the following commands in the diagnostic view of the AP:

   • V200R019C00 and earlier versions:

     [AP-diagnose] display wifi base-info radio //Run this command several times to check the current channel utilization.

     [AP-diagnose] display wifi sta-list radio //Check the radio information and negotiated rate of STAs.

     [AP-diagnose] display wifi radio-reload-record //Check the radio reloading record.

     [AP-diagnose] display wifi base-info { history | top-history } radio //Check the recent records about the channel utilization, proportion of channels occupied due to co-channel interference, and noise floor on the radio.

   • V200R019C10 and later versions:

     [AP-diagnose] display lmac base-info radio //Run this command several times to check the current channel utilization.

     [AP-diagnose] display lmac sta-list radio //Check the radio information and negotiated rate of STAs.

     [AP-diagnose] display umac radio-reload-record //Check the radio reloading record.

2. Collect the channel and STA steering records on the AC.

   display channel switch-record { all | ap-id } //Check the channel switching records of APs.

   display station steer-history | include sta-mac-address //Check the STA steering records.

   display station roam-track sta-mac sta-mac-address //Check whether a STA roams frequently.

3. Collect STA information.

   display station sta-mac sta-mac-address //Test and compare multiple STAs.

4. Run the rf-ping command on the AC to check the quality of wireless links between the air interface and STAs.

   [AC-wlan-view] rf-ping -c 300 -m 100 sta-mac-address //Test and compare multiple STAs.

5. Perform a fast ping operation on a STA from the STA gateway.

   ping -c 1000 -m 100 sta-ip-address //Compare the ping result against the rf-ping command outputs to check whether packet loss occurs because the STA enters the power-saving mode.

6. Run the station-trace command to enable the whole-process recording of key packets between the device and STAs.
   • AC:

     [AC-diagnose] station-trace sta-mac sta-mac-address //Stop information display: undo station-trace all

   • Fat AP:

     [FAT-diagnose] station-trace key-protocol station sta-mac-address //Stop information display: undo station-trace key-protocol all

     [FAT-diagnose] station-trace assoc station sta-mac-address //Stop information display: undo station-trace assoc all

Roaming exception

Confirm fault information.

• Confirm the STA type: PDA, PC, or mobile phone.
• Check STA exceptions during roaming, for example, packet loss.
• Check whether this problem occurs on all types of STAs.
• Check the roaming mode: Layer 2 roaming or Layer 3 roaming.
• Determine the fault scope: specific AP or APs, a specific area, or all areas.
• Check the signal strength in the roaming area, including the RSSIs of STAs and APs.
• Check the AP layout: whether APs are deployed in corridors to cover indoor rooms, AP installation mode (ceiling-mounted or wall-mounted), AP installation height, distance between APs, and obstacles.

Collect information.

1. In an area where roaming fails, use the CloudCampus APP to scan signal coverage of the area and check for locations with strong interference or coverage holes.
2. Collect radio and roaming track information.

   display radio ap-id

   display ap neighbor ap-id

   display station roam-track sta-mac sta-mac-address //Check STA roaming records.

   display station steer-history | include sta-mac-address //Check STA steering records.

3. Run both the trace and station-trace commands.
4. If data retransmission occurs due to a roaming failure, collect the following AP information before and after roaming.
   • V200R019C00 and earlier versions:

     [AP-diagnose] display wifi sta-trace-info //Check STA association, authentication, and steering information.

     [AP-diagnose] display kernel-logbuf record-range { 1 | 2 | 3 } //Check kernel memory information.

   • V200R019C10 and later versions:

     [AP-diagnose] display umac sta-trace-info //Check STA association, authentication, and steering information.

     [AP-diagnose] display kernel-logbuf record-range { 1 | 2 | 3 } //Check kernel memory information.