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ME60 Troubleshooting Guide V1.0 (VRPv8)

This document provides the maintenance guide of the device, including daily maintenance, emergence maintenance, and typical troubleshooting.
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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
MPLS Forwarding Troubleshooting

MPLS Forwarding Troubleshooting

This chapter describes common causes of the MPLS forwarding faults, and provides troubleshooting flowcharts and procedures, alarms, and logs to help identify and rectify these faults.

A Host Cannot Send or Receive Packets Through an LSP

This section describes how to troubleshoot a failure in a host to send or receive packets through an LSP.

Common Causes

This section describes common causes of a failure in a host to send or receive packets through an LSP.

Common causes are as follows:

  • Routing information is incorrect.

  • The LSP does not exist.

  • The LSP status is incorrect because the BFD status is Down.

  • The system status is incorrect.

Troubleshooting Flowchart

This section describes the troubleshooting flowchart for a failure in a host to send or receive packets through an LSP.

The troubleshooting roadmap is as follows:
  • Check that the routes are correct.

  • Check that the LSP exists.

  • Check that the LSP status is normal.

  • Check that the system status is normal.

Figure 4-98 shows the troubleshooting flowchart.

Figure 4-98 Flowchart for troubleshooting a failure in a host to send or receive packets through an LSP

Troubleshooting Procedure

This section describes the procedure for troubleshooting a failure in a host to send or receive packets through an LSP.

NOTE:

Commands can be run in one of two modes: immediate validation mode or two-phase validation mode.

  • In immediate validation mode, the configurations take effect immediately after a command is run.
  • In two-phase validation mode, the configurations do not take effect until after the commit command is run.

Unless otherwise specified, this troubleshooting guide defaults to the immediate validation mode.

Save the results of each troubleshooting step. If the fault persists after following this procedure, Huawei will need these results for further troubleshooting.

Procedure

  1. Check that the routes are correct.

    Run the display fib verbose command to check whether the routing information on the ping initiator and the ping destination node.

    • If the LspFwdFlag field is not 1 and the LspToken field is 0, the IGP routes are incorrect. For instructions on how to rectify the fault, see the section "IGP Route Troubleshooting."

    • If the LspFwdFlag field is 1 and the LspToken field is not 0, IGP the routes are correct. Go to Step 2.

  2. Check that the LSP exists.

    Run the display tunnel-info command on the ping initiator and destination nodes.

    • If the LSP does not exist, see the section LDP LSP Goes Down for more information on rectifying the fault.

    • If the LSP exists and the fault persists, go to Step 3.

  3. Check that the LSP status is normal.

    Run the display mpls lsp verbose command.

    If a value of the Token field in the display mpls lsp verbose command output is the same as a value of the LspToken field in the display fib verbose command output, the LSPs indicated by the two identical tokens are the same. In this case, check whether the label, label operation mode, and next-hop information of the LSP in the output of these two commands are the same. Also, check whether the BFD status associated with the LSP is Up.

    • If BFD is configured but the BFD status is Down, see the section BFD Session Cannot Go Up for more information on rectifying the fault.

    • If the label, label operation mode, and next-hop information in the output of these two commands are the same and BFD is Up, go to Step 4.

  4. Check that the system status is normal.

    Run the display cpu-usage command.

    • If CPU usage of the MPU or interface board becomes abnormal, see the section The CPU Usage Is High for more information on rectifying the fault.

    • If memory usage of the MPU or interface board is normal, go to Step 5.

  5. contact technical support personnel:

    • Results of this troubleshooting procedure
    • Configuration files, log files, and alarm files

Relevant Alarms and Logs

This section describes relevant alarms and logs for a failure in a host to send and receive packets along an LSP.

Relevant Alarms

None

Relevant Logs

None

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Updated: 2019-06-11

Document ID: EDOC1000175918

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