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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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FR Frequently Flaps or Cannot Become Up

FR Frequently Flaps or Cannot Become Up

Common Causes

This fault is commonly caused by one of the following:

  • Interfaces at two ends are incorrectly configured. For example, the DLCI range is incorrect or the FR encapsulation format differs at two ends.
  • The link is working improperly.
  • When an E1/T1 card is used, interfaces at two ends work in different modes.
  • Protocol packets are incorrectly transmitted.

Troubleshooting Flowchart

Figure 17-1 shows the troubleshooting flowchart.
Figure 17-1  Troubleshooting flowchart for frequent FR flapping or Down

Troubleshooting Procedure

Context

NOTE:

Saving the results of each troubleshooting step is recommended. If your troubleshooting fails to correct the fault, you will have a record of your actions to provide Huawei technical support personnel.

Procedure

  1. Check that the interfaces at two ends are correctly configured.
    1. Ensure that the interface type is DTE at one end and DCE at the other end.
    2. Ensure that a correct DLCI range is configured. DLCI ranges from 16 to 1022.
    3. Ensure that the two ends are configured with the same FR Local Management Interface (LMI) protocol type.
    4. Ensure that the two ends are configured with the same FR encapsulation format. When the FR protocol is used as the encapsulation protocol, the default frame encapsulation format is the IETF format.
    5. If an E1/T1 card is used, ensure that the timeslots of interfaces at both ends match each other.

    If the fault persists, go to step 2.

  2. Check that the link is working properly.
    1. Check whether a dynamic routing protocol is configured on the interfaces and whether the routing protocol flaps.
    2. Check the interface status to ensure that no error packets are transmitted.

      When an SA card is used, clock signals must be inverted using the following commands:

      • If the remote interface receives error packets, run the invert transmit-clock command to configure the device to invert clock signals transmitted by the synchronous serial interface.
      • If the local interface receives error packets, run the invert receive-clock command to configure the device to invert clock signals received by the synchronous serial interface.

    If the fault persists, go to step 3.

  3. Check that the interfaces at two ends work in the same mode.

    If an E1/T1 card is used, ensure that the interfaces at two ends work in the same mode. By default, an E1/T1 interface works in framed mode.

    If interfaces at two ends work in the different modes, run the using or fe1 unframed command to adjust their working modes.

    If the fault persists, go to step 4.

  4. Check that protocol packets are correctly transmitted.

    You can run one of the following commands to check whether protocol packets are correctly transmitted.

    Run the debugging fr lmi command in the user view to check whether LMI packets are correctly sent and received.

    <Huawei> debugging fr lmi
    Huawei FR/8/debug8:Slot=2;
    LMI: Serial2/0/0:5 (in) status enquiry, liv 
       ssn = 217, rsn = 3
    LMI: Serial2/0/0:5 (out) status, liv
        ssn = 4, rsn = 217

    Run the display fr lmi-info command to check information about LMI packets.

    <Huawei> display fr lmi-info
    Frame relay LMI statistics for interface MFR0/0/0 (DTE, Q933)
      T391DTE = 10 (hold timer 10)
      N391DTE = 5, N392DTE = 3, N393DTE = 4
      out status enquiry = 0, in status = 0
      status timeout = 0, discarded messages = 0
    Frame relay LMI statistics for interface Serial6/0/0 (DCE, Q933)
      T392DCE = 15, N392DCE = 3, N393DCE = 4
      in status enquiry = 250, out status = 250
      status enquiry timeout = 0, discarded messages = 15

    Run the display fr statistics command to check statistics on the currently sent and received RF frames.

    <Huawei> display fr statistics interface mfr 0/0/3
    Frame relay packet statistics for interface MFR0/0/3 (DTE)
      in packets = 2132202, in bytes = 25592466
      out packets = 2132208, out bytes = 25592426

    If the fault persists, go to step 5.

  5. Collect the following information and contact technical support personnel:

    • Result of the preceding procedure
    • Trap, log, and configuration information

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Updated: 2019-05-10

Document ID: EDOC1000079719

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