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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).
VRRP Troubleshooting

VRRP Troubleshooting

This section describes common causes of VRRP faults and provides the corresponding troubleshooting flowcharts, troubleshooting procedures, alarms, and logs.

Double Master Devices Exist in a VRRP Backup Group

This section describes common causes and the troubleshooting flowchart, and provides a step-by-step troubleshooting procedure for the fault that allows two master nodes to coexist in a VRRP backup group.

Common Causes
This fault commonly results from one of the following causes:
  • The VRRP backup group configurations on two devices do not match.

  • The link over which VRRP Advertisement messages are transmitted fails.

  • Causing a loop, and then an interface is blocked on the link over which VRRP Advertisement messages are transmitted.

  • The lower-priority device in the VRRP backup group considers the received VRRP Advertisement message illegal and discards it.

Troubleshooting Flowchart
Figure 4-22 Troubleshooting flowchart for the fault that allows double master devices to exist in a VRRP backup group

Troubleshooting Procedure

Context

NOTE:

After the commands are configured to troubleshoot the faults, check the configuration validation mode to ensure that the configurations take effect. Unless otherwise specified, this manual defaults to immediate validation mode.

  • In immediate validation mode, the configurations take effect after the commands are entered.
  • In two-phase validation mode, after the commands are configured, the commit command needs to be run to commit the configurations.

Save the results of each troubleshooting step so that if your troubleshooting attempts fail to correct the fault, you will have a record of your actions to present to Huawei.

Procedure

  1. Run the display vrrp statistics command to check whether the VRRP device with a lower priority than the other device receives VRRP Advertisement packets.

    • If the VRRP Advertisement packets are received, go to Step 2.

    • If no VRRP Advertisement packets are received, go to Step 6.

  2. Check whether the configurations of the VRRP backup group on the two devices match.

    On an interface configured with the VRRP backup group, run the display this command to check whether the configurations of the VRRP backup group on the two devices match, including VRIDs, virtual IP addresses, and the network segment of interface addresses.
    • If the configurations are inconsistent, change them so that they are the same on the two devices. Then, go to Step 3.

    • If the configurations are consistent, go to Step 4.

  3. Run the display vrrp command to check whether there is only one master device in the VRRP backup group.

    • If so, the VRRP backup group is working normally.

    • If there are still two master devices, go to Step 4.

  4. Check whether the interfaces transmitting the VRRP Advertisement packets are correctly connected and run the display interface interface-type interface-number command several times to check whether the interfaces transmitting the VRRP Advertisement packets are Up.

    • If the interfaces are correctly connected and are always in the Up state, go to Step 6.

    • If the interfaces are incorrectly connected, reconnect them. After the interfaces go Up, go to Step 5.

  5. Run the display vrrp command to check whether there is one master device and one backup device in the VRRP backup group.

    • If so, the VRRP backup group is working normally.

    • If there are still two master devices, go to Step 6.

  6. Check whether the two interfaces configured with the VRRP backup group can ping each other.

    • If the ping succeeds, go to Step 7.

    • If the ping fails, the link has failed. See the section The Ping Operation Fails for help on rectifying the fault on the link and then go to Step 8.

  7. Run the display vrrp command to check whether there is only one master device in the VRRP backup group.

    • If there is only one master device, the VRRP backup group is working normally.

    • If there are still two master devices, go to Step 8.

  8. If the fault persists, collect the following information and contact technical support personnel.

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

Relevant Alarms and Logs

None.

VRRP Status of the Backup Device Flaps

This section describes common causes and the troubleshooting flowchart, and provides a step-by-step troubleshooting procedure for the fault that causes the VRRP backup group in the Backup state to flap.

Common Causes
This fault commonly results from one of the following causes:
  • The link transmitting the VRRP Advertisement packets flaps.

  • VRRP advertisement packets are filtered before being forwarded because of packet congestion.

Troubleshooting Flowchart
Figure 4-23 Troubleshooting flowchart for the fault that causes the VRRP status of the backup device to flap

Troubleshooting Procedure

Context

NOTE:

After the commands are configured to troubleshoot the faults, check the configuration validation mode to ensure that the configurations take effect. Unless otherwise specified, this manual defaults to immediate validation mode.

  • In immediate validation mode, the configurations take effect after the commands are entered.
  • In two-phase validation mode, after the commands are configured, the commit command needs to be run to commit the configurations.

Save the results of each troubleshooting step so that if your troubleshooting attempts fail to correct the fault, you will have a record of your actions to present to Huawei.

Procedure

  1. Check whether the following log message VRRP/4/vrrpTrapNewMaster is displayed, which indicates that the backup device becomes the master device because the VRRP timer expires.

    %%01vrrp/4/vrrpTrapNewMaster(l):CID=2149918552;The status of VRRP changed to master.(ifIndex=5, VrId=1, MasterIPAddress=1.1.1.2, sysName=VRPV8, ifName=Ethernet3/0/1, ChangeReason=priority calculation)
    • If this log message is displayed, go to Step 2.

    • If the preceding log message is not displayed and the fault persists, go to Step 7.

  2. Run the display interface interface-type interface-number command several times to check whether the physical status of the interface transmitting the VRRP Advertisement packets flaps.

    • If the physical interface alternates between Up and Down, repair the network cable or rectify the fault on the interface. Then, go to Step 3.

    • If the physical interface status is stable and the fault persists, go to Step 3.

  3. Run the display vrrp command several times to check whether the VRRP status of the backup device is always Backup.

    • If the backup device is in the Backup state, the VRRP backup group is working properly.

    • If the backup device is not in the Backup state, go to Step 4.

  4. Run the display vrrp statistics command to check whether any VRRP Advertisement packets with the priority value of 0 have been received.

    • If such a packet has been received, go to Step 7.

    • If no such packet has been received, go to Step 5.

  5. Run the display this command to check whether a policy for filtering packets is configured on the interface board.

    • If cpu-defend-policy is displayed in the command output, go to Step 6.

    • If cpu-defend-policy is not displayed in the command output, no policy for filtering packets is configured. Go to Step 7.

  6. Run the display this command to check whether a policy (for example, an ACL rule) for filtering VRRP Advertisement packets is configured on the interface board.

    • If a policy for filtering VRRP Advertisement packets is configured, go to Step 7.

    • If no policy for filtering VRRP Advertisement packets is configured, go to Step 8.

  7. Run the display vrrp command several times to check whether the backup device is always in the Backup state.

    • If the backup device remains in the Backup state, the VRRP backup group is working properly.

    • If the backup device status changes frequently, go to Step 8.

  8. If the fault persists, collect the following information and contact technical support personnel.

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

Relevant Alarms and Logs
Relevant Alarms

None.

Relevant Logs

VRRP/4/vrrpTrapNewMaster

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Updated: 2019-06-11

Document ID: EDOC1000175918

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