How do I locate the 3G dialup failure on an AR

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Run the display cellular interface-number network command to check the value of the Current Service Status field.
- When the value of the Current Service Status field is Service Available, the 3G service is available. Check the following configurations:
1. Check whether the dialer number is configured correctly.
2. If the 3G interface is connected to the WCDMA network or a network that is compatible with the WCDMA network, check whether the APN is configured correctly.
3. Check whether the authentication mode, user name, and password are configured correctly.
4. Check whether the dialer ACL is configured correctly.
5. Check whether static routes are configured correctly.
- When the value of the Current Service Status field is No Service, the 3G service is unavailable. Check the following configurations:
1. If the 3G interface is connected to the WCDMA network or a network that is compatible with the WCDMA network, run the display cellular interface-number network command to check values of the Mobile Country Code (MCC), Mobile Network Code (MNC), and Mobile Operator Information fields and check whether the PLMN selected by the 3G modem is consistent with that of the carrier. If the 3G interface is connected to the CDMA2000 network or a network that is compatible with the CDMA2000 network, you can skip this step.
2. Run the display cellular interface-number radio command to check the value of the Current RSSI field.
3. Check whether the 3G data card is supported by the AR.
4. Run the display cellular interface-number radio command to check the value of the SIM Status field and check whether the SIM, USIM, or UIM card status is normal.
5. Check whether the 3G hardware (including the 3G data card/3G interface card/3G model), SIM/USIM/UIM card, or 3G antenna is damaged, not properly installed, or not fastened.
6. Check whether the angle of the 3G antennas is proper.
7. Check whether 3G/2G services are enabled on the SIM, USIM, or UIM card and whether the users owe fees.
8. Run the display cellular interface-number radio command to check the value of the PIN Status field.

Other related questions:
Why does dialup often fail on a 3G cellular interface

The possible causes are as follows:

  • The 3G data card cannot be identified on the current network or is not supported on the AR.
  • The 3G data card does not match the current network. For example, authentication or service required on the current network is not enabled on the data card or USIM/SIM card. As a result, authentication or negotiation fails in dialup.
  • The 3G data card is not registered with available networks, due to weak signal strength or other reasons. Run the display cellular command to check information about 3G signals. The Current Service Status field must be displayed as "Service available", and the signal strength must be in the allowed range.
  • An incorrect connection mode is configured on the 3G data card. For example, the 3G data card has a SIM card installed but its connection mode is set to WCDMA-only.
  • The USIM/SIM card is not properly installed.
  • The 2G/3G services are not enabled on the USIM/SIM card.
  • The account balance of the USIM/SIM card is insufficient.
  • The USIM/SIM card works incorrectly. Run the display cellular command to check whether the USIM/SIM card is in correct state. The status of the USIM/SIM card must be Ok not Not insert.
  • Check whether 3G configurations, including the dialer number are correct. Check whether PPP authentication is required when the 3G cellular interface accesses a CDMA2000 network.
  • No profile is configured or a profile is incorrectly configured.
  • The 3G cellular interface is shut down using the shutdown command.

How do I locate VAP creation failures
To locate VAP creation failure on a WLAN device, perform the following steps: For an AC: V200R005 and earlier 1. Check whether the AP exists. 2. Check whether the VAPs of the AP are fully configured. 3. Check whether the radio interface is bound to a radio profile. 4. Check whether the service set is configured correctly and bound to the radio interface. 5. Check whether the configuration is committed. 6. Check whether the AP works properly and whether the configuration is delivered successfully. V200R006 and later 1. Check whether the AP exists. 2. Check whether the VAPs of the AP are fully configured. 3. Check whether the radio interface is bound to a radio profile. 4. Check whether the VAP profile is configured correctly and bound to the AP or an AP group. 5. Check whether the AP works properly and whether the configuration is delivered successfully. For a Fat AP: 1. Check whether the VAPs of the AP are fully configured. 2. Check whether the radio interface is bound to a radio profile. 3. Check whether the service set is configured correctly and bound to the radio interface. For an S series switch serving as the AC 1. Check whether the AP exists. 2. Check whether the VAPs of the AP are fully configured. 3. Check whether the radio interface is bound to a radio profile. 4. Check whether the service set is configured correctly and bound to the radio interface. 5. Check whether the configuration is committed. 6. Check whether the AP works properly and whether the configuration is delivered successfully.

How do I configure a 3G interface on an AR router
When WCDMA is used, the procedure for configuring a 3G interface is as follows: [Huawei] apn profile 3gprofile //Create an APN profile. [Huawei-apn-profile-3gprofile] apn 3GNET [Huawei-apn-profile-3gprofile] user name 3guser password cipher Password@123 authentication-mode auto [Huawei-apn-profile-3gprofile] quit [Huawei] dialer-rule //Configure a dialer ACL. [Huawei-dialer-rule] dialer-rule 1 ip permit [Huawei-dialer-rule] quit [Huawei] interface cellular 0/0/0 [Huawei-Cellular0/0/0] link-protocol ppp [Huawei-Cellular0/0/0] ip address ppp-negotiate //Configure an IP address through PPP negotiation. [Huawei-Cellular0/0/0] ppp ipcp dns request //Configure a DNS server address through PPP negotiation. [Huawei-Cellular0/0/0] dialer enable-circular //Enable C-DCC. [Huawei-Cellular0/0/0] dialer-group 1 //Associate Cellular0/0/0 to the dialer access group. [Huawei-Cellular0/0/0] dialer number *99# //Configure a dialer number for calling the remote end. [Huawei-Cellular0/0/0] mode wcdma wcdma-precedence //Configure a network connection mode. [Huawei-Cellular0/0/0] apn-profile 3gprofile //Bind the APN profile to the 3G cellular interface. [Huawei-Cellular0/0/0] shutdown [Huawei-Cellular0/0/0] undo shutdown [Huawei-Cellular0/0/0] quit When CDMA2000 is used, the procedure for configuring a 3G interface is as follows: [Huawei] dialer-rule //Configure a dialer ACL. [Huawei-dialer-rule] dialer-rule 1 ip permit [Huawei-dialer-rule] quit [Huawei] interface cellular 0/0/0 [Huawei-Cellular0/0/0] link-protocol ppp [Huawei-Cellular0/0/0] ip address ppp-negotiate //Configure an IP address through PPP negotiation. [Huawei-Cellular0/0/0] ppp ipcp dns request //Configure a DNS server address through PPP negotiation. [Huawei-Cellular0/0/0] dialer enable-circular //Enable C-DCC. [Huawei-Cellular0/0/0] dialer-group 1 //Associate Cellular0/0/0 to the dialer access group. [Huawei-Cellular0/0/0] dialer number #777 //Configure a dialer number for calling the remote end. [Huawei-Cellular0/0/0] mode cdma hybrid //Configure a network reconnection mode. [Huawei-Cellular0/0/0] quit

How to locate the ping failure
When the ping operation fails, locate the fault based on the following troubleshooting roadmap: 1. Check whether the AR interface is Up and whether the IP address is configured correctly. Command: display interface brief and display ip interface [ < interface-type > < interface-number > ] 2. If a Layer 2 interface is used, check whether STP is running on the AR and check whether the physical interface where ping packets pass is blocked. Command: display stp [ instance < instance-id > ] [ interface < interface-type > < interface-number > ] [ brief ] 3. Check whether routes are reachable: If routes are unreachable, troubleshoot the fault. Command: display ip routing-table 4. Check whether policies are configured on local and remote devices. If the remote device is a firewall, check whether the remote interface is added to a zone and whether the inter-zone rule is enabled. 5. Check whether ARP entries of the direct route are learned correctly. If ARP entries cannot be learned, check whether strict ARP learning is enabled. Disable strict ARP learning and try again. If the fault persists, perform the ping operation on one device and check whether ARP request packets are sent out from the interface and whether the remote device sends ARP reply packets based on ARP packet statistics. Commands: display arp and display arp learning strict 6. If there is no preceding problem, collect statistics on ICMP packets, determine the position where packets are lost and locate the packet loss point.

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