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AR Router Troubleshooting Guide

This Product Documentation provides guidance for maintaining AR Enterprise Router, covering common information collection and fault diagnostic commands, typical fault troubleshooting guide, and troubleshooting.
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Packets Fail to Be Forwarded on an ADSL Interface Working in ATM Mode

Packets Fail to Be Forwarded on an ADSL Interface Working in ATM Mode

This section provides a troubleshooting flowchart and a step-by-step troubleshooting procedure to use when packets fail to be forwarded on an ADSL interface working in ATM mode.

NOTE:
An ADSL interface can work only in ATM mode.

Common Causes

This fault is commonly caused by one of the following:

  • The cable is not properly connected to the interface or the interface is shut down.
  • The local and remote ADSL interfaces are using different transmission standards.

Troubleshooting Flowchart

Figure 15-5 shows the troubleshooting flowchart.

Figure 15-5 Troubleshooting flowchart for the packet forwarding failure on an ADSL interface working in ATM mode

Troubleshooting Procedure

Procedure

  1. Check that the physical status of the ADSL interface is Up.

    Run the display interface atm command in the system view to check whether the physical status of the ADSL interface is Up. The following information uses the display on ATM1/0/0 as an example.

    • If "Atm1/0/0 current state : Administratively DOWN" is displayed, ATM1/0/0 has been shut down. Run the undo shutdown command on ATM1/0/0 to enable it.

    • If "Atm1/0/0 current state : DOWN" is displayed, check the following items.

      Item

      Expected Result

      Follow-up Operation

      Check the connection between the local and remote interfaces.

      The local and remote interfaces are properly connected using a cable.

      If the local and remote interfaces are not properly connected, reconnect them. If the fault persists, change the cable between the two interfaces.

      Check the transmission standard of the local ADSL interface.

      Run the display dsl interface atm command in the system view to check the parameters settings of the local ADSL interface. The value of the Transmission mode field indicates the transmission standard of the local ADSL interface, which must be the same as the transmission standard of the remote interface. If the local and remote interfaces use different transmission standards, run the adsl standard command on the local ADSL interface to change its transmission standard to be the same as the transmission standard of the remote interface.

      If "Atm1/0/0 current state : DOWN" is still displayed, go to step 3.

    • If "Atm1/0/0 current state : UP" is displayed, ATM1/0/0 is in the Up state. Go to step 2.

  2. Check that ATM is correctly configured.
    • If IP packets are transmitted over ATM links, check the following items.

      Item

      Expected Result

      Follow-up Operation

      Run the display this command in the ADSL interface view to check whether the IP address of the local ADSL interface is on the same network segment as the IP address of the remote interface.

      IP addresses of the local ADSL interface and the remote interface are on the same network segment.

      If IP addresses of the local ADSL interface and the remote interface are on different network segments, run the ip address command in the ADSL interface view to assign the local ADSL interface an IP address that is on the same network segment as the IP address of the remote interface.

      Run the display this command in the ATM-PVC view to check whether IPoA mapping is correctly configured on the PVC.

      The mapped IP address is the IP address of the remote interface.

      If the mapped IP address is not the IP address of the remote interface, run the map ip command in the ATM-PVC view to configure the IP address of the remote interface as the mapped IP address.
    • If IPoE packets are transmitted over ATM links, check the following items.

      Item

      Expected Result

      Follow-up Operation

      Run the display this command in the VE interface view to check whether the IP address of the local VE interface is on the same network segment as the IP address of the remote interface.

      IP addresses of the local VE interface and the remote interface are on the same network segment.

      If IP addresses of the local VE interface and the remote interface are on different network segments, run the ip address command in the VE interface view to assign the local VE interface an IP address that is on the same network segment as the IP address of the remote interface.

      Run the display this command in the ATM-PVC view to check whether IPoEoA mapping is correctly configured on the PVC.

      IPoEoA mapping is correctly configured.

      If IPoEoA mapping is incorrectly configured, run the map bridge command in the ATM-PVC view to reconfigure it on the PVC.
    • If PPP packets are transmitted over ATM links, check the following items.

      Item

      Expected Result

      Follow-up Operation

      Check whether the local VT interface and the remote interface have the same PPP user name and password.

      The local VT interface and the remote interface have the same PPP user name and password.

      If the local VT interface and the remote interface have different PPP user names or passwords, run the ppp pap local-user or ppp chap password command in the VT interface view to change the PPP user name and password of the local VT interface to be the same as those of the remote interface.

      Run the display this command in the ATM-PVC view to check whether PPPoA mapping is correctly configured on the PVC.

      PPPoA mapping is correctly configured.

      If PPPoA mapping is incorrectly configured, run the map ppp command in the ATM-PVC view to reconfigure it on the PVC.
    • If PPPoE packets are transmitted over ATM links, check the following items.

      Item

      Expected Result

      Follow-up Operation

      Check whether the local dialer interface and the remote interface have the same PPP user name and password.

      The local dialer interface and the remote interface have the same PPP user name and password.

      If the local dialer interface and the remote interface have different PPP user names or passwords, run the ppp pap local-user or ppp chap password command in the dialer interface view to change the PPP user name and password of the local dialer interface to be the same as those of the remote interface.

      Run the display this command in the ATM-PVC view to check whether PPPoEoA mapping is correctly configured on the PVC.

      PPPoEoA mapping is correctly configured.

      If PPPoEoA mapping is incorrectly configured, run the map bridge command in the ATM-PVC view to reconfigure it on the PVC.

    If the fault persists, go to step 3.

  3. Collect the following information and contact technical support personnel.

    • Results of the preceding troubleshooting procedure
    • Configuration files, log files, and alarm files of the device

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Updated: 2019-08-09

Document ID: EDOC1000079719

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