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HCIA-WLAN study materials
HCIA-WLAN study resources

HCIA-WLAN: WLAN O&M and Troubleshooting

HCIA-WLAN · Work through your exam, one topic at a time.

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WLAN O&M and Troubleshooting

Domain 4 - WLAN O&M and Troubleshooting

This domain tests systematic fault isolation on Huawei WLAN: AP online state, CAPWAP establishment, client association, and RF performance. Expect command-output interpretation and ordered troubleshooting.

Core rules

  • Check AP state with display ap all. An AP can be fault, idle, or normal; display ap online-fail-record all shows why registration failed.
  • Verify CAPWAP with display capwap configuration. Common failures: no route to AC, wrong source interface, DHCP option 43 missing, AP MAC not authenticated, certificate or time mismatch.
  • Client issues: display station all shows association and authentication state; display station assoc-fail-record all shows failure reasons. Check security profile, VLAN, and DHCP.
  • Performance issues: use display ap radio and channel/spectrum scanning to find co-channel interference, low SNR, or excessive power.

Worked example

An AP shows fault and never registers. You ping the AC from the AP management VLAN and it fails. The AC source interface is Vlanif100, but the AP is on VLAN 300, and inter-VLAN routing is missing. Fix the SVI or routing, confirm DHCP option 43, then reset the AP. The reasoning: CAPWAP is IP reachability first, then authentication and configuration.

Traps

Do not start with radio power when the AP is not online. Do not assume a client DHCP failure is a WLAN problem-check the service VLAN and gateway. display ap all showing an AP does not prove its VAP is up. Debugging all stations at once can overwhelm the AC.