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Alarm Handling

AR100, AR120, AR160, AR1200, AR2200, AR3200, and AR3600 V300R003

This document provides the trap description, attributes, parameters, impact on the system, possible causes, procedures, and references. This document provides a complete set of traps, through which intended readers are kept of the running status of the device so as to locate faults.
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ARP_1.3.6.1.4.1.2011.5.25.123.2.6 hwEthernetARPIPConflictEvent

ARP_1.3.6.1.4.1.2011.5.25.123.2.6 hwEthernetARPIPConflictEvent

Description

ARP/4/ARP_IPCONFLICT_TRAP:OID [OID] ARP detects IP conflict. (IP address=[IPADDR], Local interface=[OCTET], Local MAC=[OCTET], Local vlan=[INTEGER], Local CE vlan=[INTEGER], Receive interface=[OCTET], Receive MAC=[OCTET], Receive vlan=[INTEGER], Receive CE vlan=[INTEGER], IP conflict type=[OCTET]).

An IP address conflict is detected by ARP.

Attribute

Alarm ID Alarm Severity Alarm Type

1.3.6.1.4.1.2011.5.25.123.2.6

Warning

environmentalAlarm(6)

Parameters

Name Meaning

OID

Indicates the MIB object ID of the alarm.

IP address

IP address

Local interface

Interface recorded in the ARP entry of the IP address

Local MAC

Source MAC address recorded in the ARP entry of the IP address

Local vlan

VLAN recorded in the ARP entry of the IP address

Local CE vlan

CEVLAN recorded in the ARP entry of the IP address

Receive interface

Inbound interface of the second ARP packet with the IP address

Receive MAC

Source MAC address of the second ARP packet with the IP address

Receive vlan

VLAN configured on the inbound interface of the second ARP packet with the IP address

Receive CE vlan

CEVLAN configured on the inbound interface of the second ARP packet with the IP address

IP conflict type

IP address conflict type

Impact on the System

This alarm indicates that an IP address conflict occurred. If the IP address conflict is not eliminated timely, route flapping may occur and services may be interrupted.

Possible Causes

  • Cause 1: The source IP address in an ARP packet is the same as the IP address of the inbound interface that receives the ARP packet, but the source MAC address in the ARP packet is different than the MAC address of the inbound interface.

  • Cause 2: The source IP address in an ARP packet is the same as the IP address in an existing ARP entry, but the source MAC address is different than the MAC address in the ARP entry.

  • Cause 3: The source IP address in an ARP packet is 0.0.0.0 (probe ARP packet), the destination IP address is the same as the IP address of the inbound interface that receives the ARP packet, but the source MAC address in the ARP packet is different than the MAC address of the inbound interface.

Procedure

  1. Identify the devices or users that use the same IP address.

    • If the devices or users using the same IP address can be identified, modify the IP address of one device or user. Then, go to step 2.
    • If the devices or users using the same IP address cannot be identified, Collect alarm information and configuration information, and then contact technical support personnel.

  2. End.
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Updated: 2019-03-06

Document ID: EDOC1100041475

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