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Alarm Handling

S600-E V200R010C00

This document provides the explanations, causes, and recommended actions of alarms on the product.
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DLDP_1.3.6.1.4.1.2011.5.25.173.3.1 hwDldpUnidirectionalLink

DLDP_1.3.6.1.4.1.2011.5.25.173.3.1 hwDldpUnidirectionalLink

Description

DLDP/4/DETECTUNIDIRECT(t): OID [oid] The port is detected in one way status. (IfIndex=[integer], IfName=[STRING])

A unidirectional link was detected in either of the following situations:

Single-neighbor mode: If one of the two connected devices could receive packets from the remote device but the remote device could not receive packets from the local device, the two devices were connected unidirectionally.

Multi-neighbor mode: A device detected that one of its neighbors was in unidirectional state or the device receives the disable packet.

Attribute

Alarm ID Alarm Severity Alarm Type
1.3.6.1.4.1.2011.5.25.173.3.1 Warning equipmentAlarm(5)

Parameters

Name Meaning
[oid] Indicates the MIB object ID of the alarm.
IfIndex Indicates the index of the interface where the unidirectional communication alarm is generated.
IfName Indicates the name of the interface where the unidirectional communication alarm is generated.

Impact on the System

The interface cannot receive packets.

Possible Causes

To ensure bidirectional communication between interfaces, establish a bidirectional connection between the interfaces. The interfaces can be connected through optical fibers or twisted-pair cables.

Figure 11-1 shows the correct connection between interfaces using two pairs of interfaces on two devices as an example.

This alarm was generated due to one of the following causes:

Cause 1: Interfaces of the two devices were not connected one to one, as shown in Figure 11-2.

Cause 2: One or more cables were disconnected, as shown in Figure 11-3.

NOTE:

Figure 11-3 uses the connection method shown in Figure 11-1 as an example.

Cause 3: Links were disconnected because of faults, as shown in Figure 11-4.

NOTE:

Figure 11-4 uses the connection method shown in Figure 11-1 as an example.

Procedure

  1. Run the display dldp command in the system view to check the DLDP unidirectional-shutdown field. The DLDP unidirectional-shutdown field specifies the mode in which an interface is disabled when a unidirectional link is detected. Perform the following operations according to the DLDP unidirectional-shutdown field value:

    • If the DLDP unidirectional-shutdown field displays manual, the interface is disabled manually.

      Run the shutdown command in the interface view to disable the interface from sending or receiving packets. Then go to step 2.

    • If the DLDP unidirectional-shutdown field displays auto, the interface is disabled automatically.

      The system sends logs and alarm messages automatically and sets the interface status to Block. Go to step 2.

  2. Check whether devices are cross-connected.

    • If so, connect the devices correctly and go to step 4.

    • If not, go to step 3.

  3. Check whether the physical connection between the two devices is correct.

    • If so, go to step 5.

    • If not, connect the optical fiber or twisted-pair cable to the two devices and go to step 4.

    If any of the following situations occurs, the physical connection between the two devices is incorrect:
    • An optical fiber is disconnected.
    • The twisted-pair cable is disconnected.

  4. Check whether the alarm is cleared.

    • If so, go to step 7.

    • If not, go to step 5.

  5. Check whether any optical fiber or twisted-pair cable is damaged.

    • If so, replace the optical fiber or twisted-pair cable and go to step 4.

    • If not, go to step 6.

  6. Contact technical support personnel.
  7. End.

    The following situations indicate that the fault is rectified:

    • The alarm is not displayed on the NMS.
    • This alarm is not displayed in the display trapbuffer command output.
    • This alarm is not displayed when you run the terminal monitor or terminal trapping command.

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Updated: 2019-04-18

Document ID: EDOC1000141873

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