- About This Document
- Using eDesk Pro for Network Inspection and Troubleshooting
- Using Troubleshooting Insights
Risky Operations
Routine Maintenance
Troubleshooting: Hardware
- Hardware Overview
Troubleshooting Guidelines for Hardware
- Device Structure: A Noise Is Heard When the Device Is Shaken
- Device Structure: Network Cables Cannot Be Tightly Inserted into Ethernet Ports
- Power Supply: The AC Power Module Is Faulty
- Power Supply: The Device Fails to Be Powered On
- Power Supply: The Power Indicator on the Device Is Steady Red
- Device Power-On: The AC Can Be Powered On but Cannot Be Started, and No Information Is Displayed on the Console Port
- Device Power-On: The AC Can Be Powered On with Information Displayed on the Console Port, but Cannot Be Started
- Device Power-On: The Maintenance Terminal Does Not Display Anything Or Displays Garbled Characters
- Device Power-On: The Device Restarts Unexpectedly or Repeatedly
- Device Power-On: An AP Cannot Be Powered On or Fails to Start After Power-On
- Optical Module: Typical Optical Module Troubleshooting Procedure
- Optical Module: The Device Cannot Display Any Optical Module Information but Services Are Running Normally
- Optical Module: The Transmit Power of an Optical Module Is Low
- Optical Module: An Optical Module Does Not Send Light Signals
- Optical Module: The Transmit Optical Power of an Optical Module Is in the Normal Range, but Many Packets Are Dropped Due to Bit Errors on the Optical Interface
- Port: Electrical Ports on the AC Cannot Go Up
- Port: Optical Ports on the AC Cannot Go Up
- Port: After an Optical Fiber Is Inserted into an Optical Port on the AC, the Optical Port Cannot Go Up
- Port: Electrical Ports on an AP Cannot Go Up
- Port: Optical Ports on an AP Cannot Go Up
- PoE: The AC Cannot Supply PoE to APs
- PoE: An AP Cannot Be Powered On Using PoE
- Memory: Failed to Write Data to the SD Card or USB Flash Drive on the AC
Troubleshooting Cases for Hardware Faults
- Case Study: No Loads Are Installed on Idle Antenna Ports, Affecting Device Reliability
- Case Study: APs Fail to Go Online or Ping Packets Are Lost Due to Poor Network Cable Quality, Incorrect Cable Installation, or Insufficient Optical Fiber Power
- Case Study: PoE Adapters Fail Because APs Are Not Properly Grounded
- Case Study: No Dustproof Measures Are Taken in the Device Installation Environment, Affecting Heat Dissipation
- Case Study: Lightning Strike Occurs on an AP Due to a Lack of Surge Protectors
- Case Study: Water Enters an AP Because the AP Is Not Waterproofed
- Case Study: Lack of Heat Dissipation Design During Installation Causes an AP to Fail to Operate Properly Due to High Temperature
- Case Study: An AP Is Damaged Due to Electric Leakage in the Installation Environment
- Case Study: Wall Plate APs Are Not Mounted on Walls and Repeatedly Restart Due to Overheat
- Case Study: PoE Injectors Are Damaged Due to Improper Installation
- Case Study: Insufficient Power Supply Affects Device Operation
- Case Study: APs Restart Occasionally
Hardware FAQs
- How Can I Determine Whether an AP Is Qualified?
- How Long Is the Maximum PoE Power Supply Distance?
- Which Lines Do Huawei APs Use to Support PoE? Idle Lines or Signal Lines?
- What Is the Outdoor Coverage Distance of the AP8030DN and AP8050DN? What Is the Coverage Radius of the AP8130DN and AP8150DN with External Omnidirectional Antennas Connected?
- What Installation Modes Are Supported by Indoor and Outdoor APs? What Are the Recommended Installation Heights?
- What Are the Requirements for Pole Dimensions When an Outdoor AP Is Installed on a Pole?
- What Is the Ethernet Cable Length Required for AP Installation?
- Why An Outdoor AP Must Be Grounded?
- How Are Antennas Classified? Which Antennas Are Often Used by Huawei?
- Which WLAN Components Are Commonly Used?
- Can Antennas Amplify Signals?
- What Is Antenna Coverage?
- Is the Antenna Gain Determined During Production? Can the Antenna Gain Be Adjusted?
- What Are Requirements on a Multi-band Combiner?
- Which Passive Components Are Commonly Used?
- What Are the Antenna Tilt, Beamwidth, and Half-Power Beamwidth?
- In Which Scenario Does the Indoor AP Apply To?
- In Which Scenario Does the Outdoor AP Apply To?
- What Are the Requirements for the Pole Dimensions When an Antenna Is Installed on a Pole?
- How Do I Determine the Feeder Length When Installing Antennas?
- What Are the Azimuth and Downtilt of Directional Antennas?
- What Are the Differences Between Dual-Polarized and Single-Polarized Antennas?
- How Do I Select Outdoor Large-Gain Antennas for Transmission and Relay?
- How Do I Calculate AP Power?
- Method for Identifying a PoE Power Supply Failure Caused by High Network Cable Resistance
Troubleshooting: STA Experience Faults
Troubleshooting Guidelines for STA Experience Faults
- The Network Access Speed Is Slow
- The Link Setup Rate of STAs Is Low
- STA Packet Loss (Wireless Side)
- A STA Fails to Ping the Gateway (Packets Are Lost on the Wired Side)
- The Received Signal Strength of a STA Is Weak
- A STA Cannot Detect Wi-Fi Signals
- STAs Cannot Communicate with Each Other
- STA Roaming Fails
- Signal Interference Occurs
Troubleshooting Cases for STA Experience Issues
- Case Study: STAs Encounter Weak Signals or Go Offline Because of the Improper Transmit Power Planning for Properly Deployed APs
- Case Study: Severe Service Suspension Occurs on STAs Due to Improper Channel Planning
- Case Study: Wi-Fi Experience Is Poor When APs Are Installed Too Densely or Sparsely
- Case Study: AP Installation Positions Are Blocked by Obstacles, Causing Weak Signals for STAs
- Case Study: Wi-Fi Cannot Be Used Due to Other Interference in the Installation Environment
- Case Study: STAs Encounter Weak Signals or No Signals in the Coverage Area Due to Incorrect Antenna Selection
- Case Study: STAs Encounter Weak Signals in the Coverage Area Due to Incorrect Installation Directions of Antennas
- Case Study: STAs Encounter Weak Signals in the Coverage Area Due to Insufficient Antenna Power
- Case Study: A STA Prefers Channels 1 to 11 and Does Not Associate with or Roam to the Nearest AP
- Case Study: Mobile Phones Running HarmonyOS Do Not Roam Because Huawei's Proprietary 802.11r Is Disabled
- Case Study: Layer 3 Roaming Fails Because a STA Fails to Obtain an IP Address
- Case Study: A PDA Goes Offline During Roaming Due to Poor Wireless Signal Coverage
- Case Study: A PDA Goes Offline During Roaming Due to Low Roaming Sensitivity
- Case Study: Frame Freezing Occurs in a Tencent Video Conference Due to Network Adapter Compatibility Issues or Wired-Side Link Exceptions
- Case Study: A STA Enters the Power-Saving Mode, Leading to a High Delay
- Case Study: Wired Users Can Connect to Printers but Wireless Users Cannot
- Case Study: The WIDS Containment Effect Is Poor
STA Experience FAQs
- How Can I Calculate the Link Setup Rate of the Wi-Fi Air Interface?
- What Are the Maximum Link Setup Rate, Real-time Packet Sending Rate, and Bandwidth of a STA?
- What Are the Physical Rate, Theoretical Rate, and Actual STA Rate in the 802.11 Standard?
- Is the WLAN Rate the Upstream or Downstream Rate?
- Why Is the Association Rate Displayed on Wireless Terminals Low?
- Does an Online 802.11b/g Terminal Affect the Rate of an Online 802.11n Terminal?
- Does BT Download Occupy High Bandwidth and Reduce WLAN Efficiency?
- What Measures Can Be Taken If the Network Access Rate Is Low Due to Weak WLAN Signal Strength?
- STA Receives Strong Signals from an AP, But the Network Speed Is Slow. How Can I Locate the Problem?
- How Do I Configure Multicast Packet Suppression to Reduce Impact of a Large Number of Low-Rate Multicast Packets on the Wireless Network?
- How Do I Configure Wireless User Isolation?
- How Can I Separate Two STAs that Connect to the Same AP and SSID?
- What Is the Roaming Mechanism of APs?
- What Roaming Types Are Supported by WLAN Devices?
- Is Reauthentication or Re-login Required for a STA During STA Roaming? Do the STA's Subnet Properties (Including the IP Address, Home VLAN, ACL, and Priority) Change?
- Why Is the Channel Switching Sometimes Slow During STA Roaming? How Can I Improve the Roaming Sensitivity of a Wireless NIC?
- Why Does Roaming Fail in Direct Forwarding Mode After IPSG Is Configured on a GE Port?
- Why Did STA Fail to Search 802.11n Signals After the AP Is Enabled with 802.11n?
- I Bought a Wi-Fi NIC That Is Claimed to Comply With 802.11a/b/g/n. Why Are 5 GHz AP Signals (AP Working on Channel 149) Not Detected Using This NIC?
- How Can I Collect Statistics on User Service Interruption?
- What Terminal Types Can Be Identified Using the Terminal Type Identification Function? How Can I View Information About the Identified Terminals?
- Why Is the Signal Strength That a STA Receives from an AP Weak?
- How Can a WLAN Network Be Optimized?
- Is There Interference Between Antennas of an Indoor Distributed AP?
- In a Student Dormitory Building with Indoor Distributed APs Deployed, Internet Users Encounter Video Pauses or Slow Network Access Rates in Peak Hours. Why?
- What Methods Does an AP Use to Prevent Interference?
- What Are Interference Sources on WLANs? How Is the Interference Strength?
- WLAN Network Planning
Troubleshooting: AP Joining Faults
Troubleshooting Guidelines for AP Joining Faults
Troubleshooting Cases for AP Onboarding Issues
- Case Study: APs Fail to Go Online Because the AP Upgrade Is Configured on the AC but the Upgrade File Does Not Exist
- Case Study: An AP Fails to Go Online Again After Going Offline Unexpectedly, and the AP Status Is Displayed as cfgfa
- Case Study: An AP Fails to Go Online Across Network Segments Due to Incorrect Option 43 Configuration
- Case Study: APs on Different Network Segments Fail to Go Online Because the UDP Port of the CAPWAP Tunnel Is Restricted on the Intermediate Network
- Case Study: APs Fail to Go Online Due to a CAPWAP Source IP Address Conflict
- Case Study: In AC VRRP HSB Scenarios, APs Go Offline Unexpectedly Due to a Loop on the Network
- Case Study: The Eth-Trunk Configuration Is Lost and a Loop Occurs on the Network, Causing APs to Go Offline Unexpectedly
- Case Study: An RU Goes Offline Unexpectedly Due to a Loop on the Downlink Wired Interface of the RU
AP Onboarding FAQs
- What Are the Timeout Mechanism of CAPWAP Link and Timeout Period Calculation?
- Does Huawei Provide a Comprehensive Solution for Managing APs of Different Manufacturers?
- Is the Scanned Air Port MAC Address of the SSID Sent by Huawei APs in Multicast Mode the Same as the AP's MAC Address?
- How Is a BSSID Generated? (V200R005C10 and Earlier Versions)
- What Is the Function of a WLAN AC Source or CAPWAP Source?
- How Can I Collect Statistics on APs' Failures to Go Online?
- Why Do IP Address Conflicts Occur on an AC? What Measures Should Be Taken in This Case?
- Why Does an AP Restart Repeatedly or Its IP Address Change Frequently?
- How Can I Know Whether an AP Has Obtained an IP Address?
- What Measures Should Be Taken When an AP Fails to Obtain an IP Address Using DHCP?
- What Measures Should Be Taken When an AC Fails to Respond to the Discovery Packet Sent by an AP After the AP Obtains an IP Address?
- How Do APs Obtain the AC IP Address? What Is the Recommended Method?
- How Can I Configure an AC as a DNS Server?
- What Cautions Should Be Taken When Configuring Option 43 on the AC?
- Can a DHCP Server (BAS, High-End Router, or High-End Switch) Allocate IP Addresses to APs?
- What Cautions Should Be Taken When Configuring a Layer 2 Access Network Between APs and the Gateway on a WLAN?
- How Do I Configure an AP to Go Online Using a Static IP Address?
- What Are the Differences in APs' Layer 2 and Layer 3 Access to ACs?
- What Is the Registration Procedure When a Fit AP and an AC Are Connected Directly or over a Layer 2 Network?
- What Is the Registration (in DNS Mode) Procedure When an AC and a Fit AP Are Connected Across a Layer 3 Network?
- What Is the Registration (in Option 43 Mode) Procedure When an AC and a Fit AP Are Connected Across a Layer 3 Network?
- Can a Central AP Be Used as a Switch and Connected to a Common AP?
- Can a Central AP Be Connected to RUs Through a Switch?
- What Are the Precautions for Deploying a Central AP?
- What States Does an AP Have?
- What Is the Function of an AP Region? (V200R005 and Earlier Versions)
- How Does an AP Go Online?
- How Do I Query the AP Version?
- An AP Can Be Restarted Using Command Lines on the AC, Restarted Manually After Login, By Holding down the Default Button on the AP or Powering off and then Powering on the AP. What Are Their Differences and Application Scenarios?
- How to Batch Upgrade Ap-version in Special Ap-type? Can I Upgrade a Specified AP?
- Can Huawei APs Use IPv4 or IPv6 Addresses to Establish Tunnels with an AC?
- What Parameters Are Set to Enable the Plug-and-Play function of Huawei APs?
- Does an AC Manage APs in a Polling Manner or in Real Time? How Does It Manage APs? How Do Packets Queue?
- How Many RUs Can a Central AP Manage?
- The AP Authentication Mode Is Set to MAC or SN. After the MAC Address or SN of an AP Is Added Offline, the AP Can Obtain an IP Address and the License Is Normal. However, the AP Fails to Go Online. How Can I Solve This Problem?
- How Can I Access an AP If I Forget the Static IP Address of the AP and No Serial Cable Is Available?
- Is the Configuration Delivered to an AP Every Time the commit ap Command Is Executed?
- What Commands on the AC Can I Use to View the Status of an AP?
- How Do I Check an AP's Working Radio on the AC?
- How Do I Replace a Faulty AP to Accelerate Service Recovery?
- Does an AP Configured with Multiple SSIDs Support the Same Number of Access Users as an AP Configured with One SSID?
- Can an AP (Single Radio) with Different SSIDs Work at Different Channels?
- Can AP Names and AP IDs Contain Chinese Characters?
- Can SSIDs Contain Chinese Characters?
- How Can I Obtain the AP ID Based on the Air Interface MAC Address of an AP?
- How Many AP Access Control Modes Does an AC Support?
- Why Is a VAP Created?
- How Do I Locate a VAP Creation Failure?
- What Are Service Set Types on an AC? (V200R005C10 and Earlier Versions)
- What Is the Maximum Number of VAPs That Can Be Created on an AC?
- Must a Service VLAN Be Specified for Each Service Set? (V200R005C10 and Earlier Versions)
Troubleshooting: STA Onboarding Faults
Troubleshooting Guidelines for STA Onboarding Faults
Troubleshooting Cases for STA Onboarding Issues
- Case Study: After a WLAN Device Is Upgraded from V200R007 to V200R019, Services Are Interrupted After the Access Control System Connects to the Wireless Network
- Case Study: During Radio Calibration, the AC Redelivers Channels and Transmit Power, Causing Intermittent Disconnection of STAs
- Case Study: A STA Fails to Go Online Because It Fails to Negotiate with an AP Using a Cached PMK
- Case Study: STAs Fail to Go Online Because No IP Address Is Obtained Due to Traffic Filtering
- Case Study: STAs Fail to Obtain IP Addresses and Fail to Go Online Because an Intermediate Device Does Not Create Service VLAN or Transparently Transmit Service VLAN Packets
- Case Study: STAs Fail to Access the Internet Because There Are Other DHCP Servers on the Network and the STAs Obtain IP Addresses on Other Network Segments
- Case Study: Some STAs Cannot Connect to the Wi-Fi Network Due to Radar Interference
- Case Study: Multiple STAs Fail or Take a Long Time to Obtain IP Addresses
STA Onboarding FAQs
- What Are the ESS, BSS, and SSID?
- Why Are STAs Associated with Other APs Than Nearby APs in Multi-AP Scenarios?
- The Laptop Uses the 802.11b/g NIC. How Can I Associate It with a 802.11n AP?
- Why Does a STA Fail to Associate with an AP When WEP and TKIP Encryption Is Configured in 802.11n Mode?
- Can 802.11n Devices Work Only in 802.11n Mode? Can 802.11n Devices Work in 802.11b/g Mode?
- How Can I View Historical Going-Online and Going-Offline Records of a STA on the AC?
- How Can I Check that a STA Successfully Connects to the WLAN?
- Does a STA Blacklist Force STAs to Go Offline?
- Why Cannot STA Associate with an AP When WEP Authentication Is Used?
- Why Cannot Users Associate with APs When WPA-PSK Authentication Is Used?
- What Are the Differences in AP-side Switch Interface Configuration and Intermediate Switch Configuration in Direct and Tunnel Forwarding Modes?
- What Are Advantages and Disadvantages of Direct Forwarding and Tunnel Forwarding?
- How Do I Confirm Wireless Parameters of a STA After the STA Associates with an AP?
- Is the Number of Access Users in Dual-band Mode Twice the Number of Access Users in Single-band Mode?
- Are All Traffic Statistics Collected in Local Forwarding Mode?
- Is service data Aggregated on an AC? What Is the Recommended Forwarding Mode and Why?
- How Do I Defend Against Bogus DHCP Servers at the User Side?
- Do I Need to Create a Service VLAN on an AC When the AC Is Deployed in Bypass Mode and Service Data Is Forwarded in Direct Mode?
- Users Have Been Connected and Assigned IP Addresses, but There Is No User Information in the display access-user Command on the AC. Why?
- What Is the Difference Between Direct Forwarding and Tunnel Forwarding During STA Login?
- After iPhones or iPads Running Some Versions (Such as iOS 7.0.4) Associate with an AP, No Signal Bar Is Displayed. How Do I Solve the Problem?
- What Should I Do If iTunes Exits Unexpectedly When User Terminals Obtain Service Information Through iTunes?
- iPhones Cannot Obtain IP Addresses Whereas Other Terminals Can. How Can I Solve This Problem?
- An Apple Terminal Goes Offline After the Screen Is Locked. When the Screen Is Turned On, the Terminal Does Not Automatically Associate with the WLAN. Why?
- Android and Windows Terminals Can Properly Access the Web Server on the Intranet but iOS Terminals Cannot. Why?
Troubleshooting: Wireless Access Authentication Issues
802.1X Authentication Failures
HTTP-based External Portal Authentication Failures
Failures in External Portal Authentication Using the Portal Protocol
Portal Redirection Failures
Built-in Portal LDAP or AD Authentication Failures
Failure to Access the Built-in Portal Page
Troubleshooting Cases for STA Authentication Failures
- Case Study: The Portal Page Cannot Be Displayed Because DNS Packets from STAs Are Not Permitted in the AC Authentication-Free Rule Profile
- Case Study: The Portal Authentication Page Cannot Be Displayed After a STA Connects to an AP Because the Network Is Unavailable Between the STA and Portal Server
- Case Study: The Portal Authentication Page Is Not Displayed Because the Portal Server Cannot Identify the URL Pushed by an AP
- Case Study: STA Authentication Fails Because the Shared Keys Configured on the AC and Portal Server Are Different
- Case Study: STA Authentication Fails Due to Inconsistent Portal Protocol Versions on the AC and Portal Server
- Case Study: STA Authentication Fails Because the Portal Server IP Address Specified on the AC Is Different from the Actual IP Address of the Portal Server
- Case Study: STA Authentication Fails Because the Source IP Address for Communication with the Portal Server Is Not Specified on the AC
- Case Study: STA Authentication Fails Due to Incomplete Configuration of the Authentication Scheme Profile on the AC
- Case Study: STA Authentication Fails Due to Incomplete Authentication Profile Configuration
- Case Study: The Portal Authentication Page Is Frequently Displayed on STAs Because the Heartbeat Interval Between the Portal Server and STAs Is Too Short
- Case Study: STA 802.1X Authentication Fails Due to Insufficient AP Signal Coverage
- Case Study: 802.1X Authentication Fails Because a STA Cannot Identify EAP Packets Whose Payload Length Exceeds 1000 Bytes
- Case Study: STA Authentication Fails Because the Shared Key Configured on the RADIUS Server Is Different from That Configured on the AC
- Case Study: STA Authentication Fails Because the RADIUS Server Fails to Deliver ACL Authorization Policies
- Case Study: STA 802.1X Authentication Fails Because the RADIUS Server Does Not Support WPA3-related Attributes
- Case Study: STA Portal Authentication Fails Because the Port Number for Listening to Portal Packets Is Incorrectly Configured on the AC
- Case Study: STAs Fail to Access Specific Websites After Passing Portal Authentication Because the Force-push Function Is Incorrectly Configured in a Domain
- Case Study: STA 802.1X Authentication Fails Because the Response Packet from the RADIUS Server Does Not Carry the Message-Authenticator Attribute
- Case Study: The AC Fails to Disconnect STAs Because It Cannot Identify the MAC Address Format in the Calling-Station-Id Attribute of DM Packets Delivered by the RADIUS Server
- Case Study: STA 802.1X Authentication Fails Because the Service VLAN Is Incorrectly Configured on the AC
- Case Study: STA 802.1X Authentication Fails Because the dot1x-access-profile Configuration Is Lost in the Authentication Profile
- Case Study: 802.1X Authentication Fails When the Agile Controller-Campus Server Is Connected
- Case Study: During 802.1X Authentication, Some STAs Fail Authentication While Some Succeed
- Case Study: After a STA Connects to an SSID and Opens a Browser, the Portal Authentication Page Is Not Displayed
- Case Study: Built-in Portal Authentication Fails
WLAN Authentication FAQs
- How Can I View Device Authentication Specifications?
- Is VLAN-based Authorization Supported by MAC Address Authentication and Portal Authentication?
- What RADIUS Attributes Need to Be Delivered for VLAN-based Authorization?
- What Are the Restrictions of an Authorization ACL?
- Which 802.1X Authentication Modes Are Supported by the Device?
- What Are the Differences Between Fast Roaming and Non-Fast Roaming?
- Does the Device Support Built-in Portal Page Customization? What Are the Requirements for Page Elements?
- How Do I Use Redirection Parameters?
- Does the AD/LDAP Base DN Support Chinese Characters?
- How Do Different Authentication Modes Support AD/LDAP Authentication?
- What Are the Differences Between CA, Local, and Self-Signed Certificates?
- Which Certificate Formats Are Supported?
- How Do I Manually Import Certificates and an RSA Key Pair?
- In Portal Authentication Mode, iPhones in iOS 6.0 or Higher Versions Cannot Associate with APs, and iPads Are Disconnected Immediately After Passing Authentication. How Can I Solve This Problem?
- In Portal Authentication, Why Does the Redirected Authentication Page Fail to Be Triggered on Some Websites (Such as Google and Baidu)?
- Why Cannot a STA Access the Internet Through WeChat Authentication?
- iPhones Running iOS 6.0 or Later Fail to Associate with a WLAN Using Portal Authentication. iPads Are Disconnected Immediately After Being Authenticated. How Do I Solve These Problems?
- How Do I Perform Configurations to Free Portal Users from Reauthentication When Portal Authentication and Roaming Have Been Enabled and Wi-Fi Coverage Holes Exist?
- What Is the Difference Between Portal Authentication and 802.1X Authentication?
- What Are Advantages and Disadvantages of WAPI Authentication?
- What Is Centralized Authentication?
- In a VRRP HSB Scenario, Portal Authentication Fails. Why?
- What Can I Do If an Error Message Is Displayed During the Weak Password Configuration After the Weak Password Dictionary Is Loaded?
Troubleshooting: Device Login Faults
Troubleshooting Guidelines for Device Login Faults
Device Login FAQs
- What Authentication Protocols Are Supported During STA Login? Which One Is Recommended and Why?
- The admin Account Fails to Log In to the Web System, and Login Still Fails After the Password Is Changed. How Can I Solve This Problem?
- Why Cannot the Web Login Page Be Displayed?
- Why Are Operations on the Web System Often Timed Out?
- Why Are Only the Monitoring and Maintenance Menu Displayed After Login to the Web System?
- How Can a PC Log In to an AP Using Telnet Through a Network Cable When No Serial Cable Is Available?
- After the Encryption Algorithm Is Upgraded, an Error Message Is Displayed When I Attempt to Log In to the Device Using STelnet. What Can I Do to Solve the Problem?
- What Are System Users of WLAN devices?
Troubleshooting: Device Upgrade Faults
Troubleshooting Guidelines for Device Upgrade Faults
Troubleshooting Cases for Device Upgrade Failures
Device Upgrade FAQs
- APs Cannot Load the Version File After the ap-update multi-load Command Is Executed. How Can I Locate the Problem?
- Why Do Many APs Report Failures When Version Files Are Loaded in FTP Mode?
- APs Are Successfully Loaded with Version Files in Batches Using FTP. Why Are They Reset Repeatedly and Loaded with the Version Files Again?
- When a Fit AP Is Upgraded in FTP Mode, the AP State Is Always download-fault. FTP and Links Are Working Properly, and the Upgrade File Is Downloaded From Huawei Support Website Without Changing the File Name. How Can I Solve This Problem?
- After an AC6605 Is Upgraded from V200R002 to V200R003, APs Connected to the AC6605 Cannot Be Upgraded and Their Names Are Incorrectly Displayed. Why?
- What Can Do If a Fat AP Enters the Assistant Package System After Multiple Start Failures?
- How Many AP Upgrade Modes Are Available? How Do I Set the AP Upgrade Mode?
Troubleshooting: Device Management Faults
Troubleshooting Guidelines for Device Management Faults
Device Management FAQs
- License
- How Do I Save Logs to the Log System?
- How Do I Check the MAC Address of a WLAN Device?
- After an 802.3at AP in V200R008C10 Is Connected to a Switch in V200R001, V200R002, or V200R003, the AP Works in 802.3af Mode. How Can I Enable the AP to Work in 802.3at Mode?
- How Do I View Operations on the Device?
- What WLAN Products and Versions Support the PPPoE Dial-up Function?
- How Do I View Debugging Information?
- Description of Common Logs on ACs
Troubleshooting: Reliability Faults
Troubleshooting Guidelines for Reliability Faults
- Dual-Link Switchover or Revertive Switching Fails
- Services Are Not Switched as Expected in a Dual-Link Backup Scenario
- An Incorrect Active AC Is Selected in a Dual-Link Backup Scenario
- Failed to Set Up Dual Links
- Dual-Link HSB Fails
- VRRP HSB Fails to Be Deployed
- Wireless Configuration Synchronization Fails
Troubleshooting Cases for Reliability Issues
- Case Study: VRRP Switchback Fails Due to a Short Recovery Delay of the VRRP Group
- Case Study: A Dual-Link Switchover Occurs When the Active Link Is Normal
- Case Study: When the Active AC Is Faulty, APs on the Active AC Fail to Go Online on the Standby AC
- Fault Case: In a Dual-Link Scenario, an Active/Standby AC Switchover Occurs and a Revertive Switchover Is Performed. Before the Revertive Switchover, the AP Restarts. After the AP Goes Online Again, an Incorrect Active/Standby AC Is Selected
- Case Study: In a Dual-Link Scenario, an AP Does Not Select an AC with a Higher Priority to Go Online
- Case Study: After the Active and Standby ACs Are Upgraded and Restarted, APs Go Online on the Standby AC but Not on the Active AC
- Fault Case: In AC HSB Scenarios, New STAs Cannot Go Online and All APs Go Offline After an Active/Standby AC Switchover
- Case Study: Wireless Configuration Synchronization Does Not Take Effect
Reliability FAQs
- What Are WLAN Reliability Features?
- What Are Precautions for Deploying the WLAN Standby Plan?
- Do ACs Working in VRRP HSB Mode Support VRRP Load Balancing?
- After VRRP HSB Is Deployed on ACs, the AP Status on the Active AC Is Normal. Is the AP Status on the Standby AC Automatically Backed Up?
- In a VRRP Scenario, a User Can Ping the Web Server IP Address, but the Web Page Displays an Authentication Failure After Redirection. Why?
- Does the Virtual IP Address in a VRRP HSB Scenario Exist?
- In a VRRP Scenario, Advertisement Packets Cannot Be Forwarded Between the Active and Standby ACs, and the Standby AC Fails to Become the Active AC. Why?
- VRRP Is Configured on the Downlinks of ACs but Not on the Uplinks of ACs. If a Downlink Fails, Will User Services Be Interrupted? If So, Can the Services Be Recovered?
- In a VRRP HSB Scenario, When the Master AC Is Restarted, an Active/Standby Switchover Is Triggered Normally. After the Original Master AC Is Restarted, All APs Become Faulty and Services Are Interrupted. Why?
- What Is Configuration Rollback? What Is Version Rollback?
- How Can I Activate a Suspended AP When the AP Uses the PoE Power Supply?
Troubleshooting: Wireless Bridge Service Faults
Troubleshooting Guidelines for Wireless Bridge Service Faults
Wireless Bridge FAQs
- Can a Root Node on a WDS Network Send Signals of WDS VAPs and Service VAPs at the Same Time?
- What Are the Precautions for WDS Backhaul?
- What Factors Affect WDS Backhaul Bandwidth?
- Do All Huawei APs Support the Mesh Function?
- Is Redundancy Used or a Proximate AP Selected as a Repeater AP to Ensure That Other WDS Bridges Work Properly When the Middle AP Is Faulty or Powered Off?
Troubleshooting: Radio Management Service Faults
Troubleshooting Guidelines for Radio Management Service Faults
Radio Management FAQs
- Why Does a Manually Configured Radio Channel Not Take Effect?
- What Is Load Balancing? Do APs Support Load Balancing Based on the Number of Users? (If One AP Has More Users Than Another AP in an Area, Can Users Be Evenly Distributed Between the Two APs?)
- What Are the Requirements for a Radio to Join a Load Balancing Group?
- Why Is Displayed Radio Member Traffic Information Inaccurate?
- Do Channel and Power Changes Cause Service Interruption on STAs During Automatic Radio Calibration?
- Why Does an AC Fail to Report Unauthorized APs After Calibration Is Enabled?
- Why Cannot Authorized Neighbors Be Detected After Radio Calibration Is Enabled?
- Can APs Automatically Select Channels with Higher Quality? Can They Change Channels When Current Channels Encounter Interference from an Electromagnetic Wave Source such as a Microwave Oven?
- Can Spectrum Be Analyzed? If Yes, How Can I Analyze It?
- Why Is No Data Displayed After the AP Spectrum Graph Is Opened on eSight?
- Do APs Support Power Adjustment and What Is the Power Adjustment Mechanism?
- How Does an AP Adjust the Rate?
- Can Huawei 802.11n APs Automatically Switch Between 2.4 GHz and 5 GHz?
- Can Antennas in an Antenna Group on APs That Support MIMO Technology Be Used Independently?
- Do Huawei APs Support Automatic Power Adjustment? How Do They Implement It? Why Cannot Automatic Power Adjustment Implement High-Density Access?
- What Is the AP Bandwidth When an AP Does Not Use the MIMO Antenna?
- What Is the Minimum Adjustment Value of Radio Power for Huawei APs?
- Why Is the RU Channel Utilization 0 on the AC or Central AP?
- What Is the Capacity of nxn MIMO?
- How Can the Uplink/Downlink Signal Power Be Improved by Increasing the AP Antenna Gain?
- How Do I Query the Power of an AP on an AC?
- How Does an AP Adjust the Rate?
- What Can I Do If an AP Cannot Detect Radar Signals?
- What Is EIRP?
- What Are Radar Channels? How Do They Affect Other Channels?
- How Does a STA Synchronize the Channel When the Associated AP Switches to Another Channel?
- Does an AP Listen to and Send Frames over One Channel?
- What Are the Differences Between H20 and H40, How Is the 11n 40 MHz Channel Is Partitioned, and What Are the Meanings of Plus and Minus?
- What Are MIMO, MRC, Beamforming, STBC, and Spatial Multiplexing?
- What Is the Working Process of 802.11n Short GI?
Troubleshooting: Cloud Management Faults
Troubleshooting: CPE Service Faults
Troubleshooting: Others
Troubleshooting Guidelines for Other WLAN Service Faults
Troubleshooting Cases for Other WLAN Service Issues
FAQs About Other WLAN Services
- What Are Characteristics of a Fat AP and a Fit AP? What Are Differences Between Them? What Are Their Applicable Scenarios?
- How Can I Obtain the Surfilter terminal location Plug-in and Related Documentation?
- How Can I Obtain the Paibo terminal location Plug-in and Related Documentation?
- What Are the Differences Between Wi-Fi Tag Location and Terminal Location?
- What Is the Difference Between the WMM Mandatory Switch and WMM Function Switch?
- What Is the Function of the WLAN QoS Profile?
- How Do I Set Parameters Such as the CIR and CBS When Configuring Rate Limiting?
- Why Is a Faulty AP Still in Normal State on eSight and eSight Receives No Alarm?
- What Are the Mappings Between WMM Queues and 802.1p Priorities?
- What Is a High-Density AP?
- Can ACLs Be Configured Based on Domain Names on an AC?
- Are Wi-Fi Signals Hazardous to Human Health?
- What Are the Implementations of 802.11n Frame Aggregation Technologies, MSDU and MPDU?
- What Is the Relationship Between WMM and 802.11e?
- What Are the Advantages and Disadvantages of FHSS and DSSS?
- What Are the Relationship and Difference Between WLAN and Wi-Fi?
- What Are the Differences Between 802.11a/b/g/n/ac/ac Wave2/ax Standards?
- What Are Common Problems on a WLAN Network?
TechNotes
WLAN Network Optimization
How an AP Joins an AC and Troubleshooting Any Join Failures
How to Log In to WLAN ACs and APs
- Introduction
- Logging In to an AC
- Logging In to an AP
- Common Causes and Troubleshooting Methods for Login Failures
- FAQ: What Can I Do If I Forget the Login Password?
- FAQ: How Can I Obtain the MAC Address of an AP?
- FAQ: How Do I Know Whether an AP Supports Bluetooth?
- FAQ: What Can I Do If an AP Fails to Detect Surrounding Bluetooth Signals and the Management SSID?
- FAQ: Why Does the Login to a Cloud AP Using the Original Account and Password Fail After the Cloud AP Goes Online on iMaster NCE-Campus?
- FAQ: Why Does an AC Fail to Log In to a Fit AP as an STelnet Client?
Troubleshooting WLAN Password Issues
AP Mode Switching - Overview, Configuration Examples, and Troubleshooting
TechNotes: Mapping Between WACs and APs
TechNotes: Wireless Packet Obtaining
VLAN Deployment Guide for WLAN
WLAN Performance Test Guide
How to Configure Option 43 When Huawei APs Are Connected to DHCP Servers of Different Vendors
- What Is Option 43 in DHCP?
- Relationship Between Option 43 and Huawei APs
- Option 43 Formats Supported by Huawei APs
- Option 43 Formats Supported by DHCP Servers of Different Vendors
- Configuring Option 43 on a Huawei DHCP Server
- Configuring Option 43 on a Cisco DHCP Server
- Configuring Option 43 on a Juniper DHCP Server
- Configuring Option 43 on a Linux ISC DHCP Server
- Configuring Option 43 on a Windows DHCP Server
- Configuring Option 43 on an Infoblox DHCP Server
Common WLAN Configuration Errors
Appendix: Common Information Collection and Fault Diagnostic Commands
- Appendix: Indicators
- Contacting Huawei Technical Support