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FR Frequently Flaps or Cannot Become Up Highlighted

Latest reply: Aug 11, 2017 05:37:30 3421 1 0 0 0

Hello everyone,

Today, I'll show you how to deal with frequent frame-relay flapping or a failure to go Up.

1. 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.

2. Troubleshooting Flowchart

Figure 1-1 shows the troubleshooting flowchart.

Figure 1-1 Troubleshooting flowchart for frequent FR flapping or down

2


3. 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

Step 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.

Step 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.

Step 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.

Step 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.

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

Result of the preceding procedure

Trap, log, and configuration information

----End

That is all I want to share with you! Thank you!


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gululu
Created Aug 11, 2017 05:37:30

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