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Log Reference

S9300, S9300E, and S9300X V200R010C00

This document provides the explanations, causes, and recommended actions of logs on the product.
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LLDP/4/BAD_PACKET:[ULONG] invalid packets were received after latest notification. The last invalid packet came from interface [STRING].


The ULONG field specifies the number of invalid LLDP packets received by a device. The STRING field indicates the name of the interface from which the last invalid LLDP packet is received.

When a device receives invalid LLDP packets for the first time, it will print this log and set the counter of invalid LLDP packets to 1. Within the following 30 seconds:
  • If the device receives invalid LLDP packets, the counter will increase by one. This log will be printed again after 30 seconds.
  • If the device does not receive invalid LLDP packets, it will not print the log and clear the counter.


Parameter Name Parameter Meaning
ULONG Indicates the number of received invalid LLDP packets.
STRING Indicates the interface from which the last LLDP packet is received.

Possible Causes

The device received invalid LLDP packets.


  1. Obtain the interface that prints this log, and run the display interface interface-type interface-number command to check the interface status. If the field Line protocol current state is displayed as Up, the interface is in Up state.

    • If the interface is in Up state, go to step 3.
    • If the interface is not in Up state, go to step 2.

  2. Check whether the interface is properly connected.

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

  3. Check whether an invalid connection exists.

    • If so, remove the connection, and go to step 5.
    • If not, go to step 4.

  4. Run the capture-packet interface interface-type interface-number destination terminal command in the system view to capture packets received by the interface STRING. Check whether the captured LLDP packets are sent from the same source MAC address.

    • If so, run the mac-address blackhole mac-address command in the system view to set this MAC address as a blackhole MAC address, and go to step 5.
    • If not, go to step 6.

  5. Check whether the device prints this log again after 30 seconds.

    • If so, go to step 6.
    • If not, no further action is required.

  6. Check whether the LLDP function needs to be enabled on the interface.

    • If so, go to step 7.
    • If not, run the undo lldp enable command on the interface to disable the LLDP function. The problem will be resolved.

  7. Collect log information and configuration information, and then contact technical support personnel.You can collect diagnostic information using the display diagnostic-information command.
Updated: 2019-08-21

Document ID: EDOC1000142069

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