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Alarm Handling

S9300, S9300E, and S9300X V200R010C00

This document provides the explanations, causes, and recommended actions of alarms on the product.
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L2IFPPI_1. hwMflpIfBlock

L2IFPPI_1. hwMflpIfBlock


L2IFPPI/4/MFLPIFBLOCK:OID [oid] Loop exists in VLAN [INTEGER], Interface [OCTET1] blocked, block-time is [GAUGE] for [OCTET2], Mac Address is [OCTET3].

MAC address flapping occurred and the interface was blocked.


Alarm ID Alarm Severity Alarm Type Warning equipmentAlarm(5)


Name Meaning
oid Indicates the ID of the MIB object.
INTEGER Indicates the VLAN ID.
OCTET1 Indicates the blocked interface name.
GAUGE Indicates the time when the interface was blocked.
OCTET3 Indicates the flapped MAC address.
OCTET2 Indicates the cause why the interface was blocked.

Impact on the System

Traffic cannot be received normally.

Possible Causes

Cause 1:

The interfaces where loops occurred were added to the same VLAN.

Cause 2:

Cables were connected incorrectly.

Cause 3:

STP was enabled to remove loops on the network.


  1. Connect cables on the interfaces correctly and check whether the alarm persists.

    • If so, go to step 2.
    • If not, no further action is required.

  2. Check whether the two interfaces that learn the same MAC address can be added to different VLANs according to the networking.

    • If so, go to step 3.
    • If not, go to step 4.

  3. Add the two interfaces that learn the same MAC address to different VLANs. Then check whether the alarm persists.

    • If so, go to step 4.
    • If not, no further action is required.

  4. Check whether the ring network meets requirements.

    • If so, go to step 7.
    • If not, go to step 5.

  5. Perform the following operations to remove loops:

    (1) Run the display loop-detect eth-loop [ vlan vlan-id ] command to view the blocked interface.

    (2) Run the display mac-address vlan vlan-id command to search an interface that learns the MAC address.

    (3) Shut down one interface according to the networking.

    (4) Run the reset loop-detect eth-loop vlan vlan-id { all | interface interface-type interface-number | mac-address mac-address } command to delete the blocked interface.

  6. Check whether the alarm recovery message is received.

    • If so, no further action is required.
    • If not, go to step 7.

  7. Enable STP. Then check whether the alarm persists.

    • If so, contact technical support personnel.
    • If not, no further action is required.

Updated: 2019-08-21

Document ID: EDOC1000142054

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