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Updated on 2024-01-25 GMT+08:00
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ALM-3276800113 The Rate of Received PDUs Exceeded the Threshold

Description

LLDP/4/RATEEXCESSIVE: OID [OID] The rate of received PDUs exceeded the threshold. (IfName=[STRING])

The LLDP packets received by an interface exceeded five in one second.

Attribute

Alarm ID

Alarm Severity

Alarm Type

3276800113

Warning

Equipment alarm

Parameters

Name

Meaning

OID

Indicates the MIB object ID of the alarm.

IfName

Indicates the interface name.

Impact on the System

If the interface is attacked by LLDP packets, it may not receive LLDP packets sent by a neighbor device. As a result, the judgment of the network topology for the NMS will be affected.

Possible Causes

  • The interface had more than five LLDP neighbors, and all neighbors sent LLDP packets to it simultaneously.
  • The interface was attacked by LLDP packets.

Procedure

  1. Run the display lldp neighbor interface interface-type interface-number command in any view to check the number of LLDP neighbors on the interface found in the alarm. The n in "STRING has n neighbor(s)" displayed in the first line is the number.

    • If n ranges from 0 to 5, the interface is attacked by LLDP packets. Go to step 2.
    • If n is greater than 5, the alarm cause cannot be determined. Go to step 2.

  2. Run the capture-packet interface interface-type interface-number destination terminal command in the system view to capture packets received by the STRING interface. Check whether two or more captured LLDP packets have 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 4.
    • If not, go to step 3.

  3. Check whether the current LLDP neighbor relationships on this interface are needed.

    • If so, this alarm is informational only, and no action is required.
    • If not, go to step 4.

  4. Disconnect unnecessary LLDP neighbor relationships. If the neighbor relationships can be disconnected, run the undo lldp enable command on the neighbor's interface that establishes a neighbor relationship with the local device to disable the LLDP function, or run the undo l2protocol-tunnel lldp enable command to disable transparent transmission for LLDP packets on the intermediate device's interface that connects to the LLDP neighbor device.
  5. If the alarm persists, collect alarm information and configuration information, and then contact technical support personnel.

Related Information

None

Parent topic: V200 LSW Alarms