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Alarm Handling

CloudEngine 8800, 7800, 6800, and 5800 V200R002C50

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

Detected an IP address collision. (IpAddress=[IpAddr], Local MacAddress=[LocalMacAddr], Local InterfaceName=[LocalIfName], Local VLAN=[LocalPVid], Local INNER-VLAN=[LocalCVid], Received MacAddress=[RcvMacAddr], Received InterfaceName=[RcvIfName], Received VLAN=[RcvPVid], Received INNER-VLAN=[RcvCVid], Collision Type=[type])

An IP address conflict is detected by ARP.

Attributes

Attribute

Description

Alarm or Event

Event

Trap Severity

Warning

Mnemonic Code

hwEthernetARPIPConflictEvent

Trap OID

1.3.6.1.4.1.2011.5.25.123.2.6

Alarm ID

0x08591021

Alarm Type

This is an event trap and does not involve alarm type.

Raise or Clear

This is an event trap and does not involve alarm generation or clearance.

Match trap

This is an event trap and does not involve the matching trap.

Parameters

Parameter Description

IpAddress

IP address

Local MacAddress

Interface recorded in the ARP entry of the IP address

Local InterfaceName

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 INNER-VLAN

INNER-VLAN recorded in the ARP entry of the IP address

Received MacAddress

Inbound interface of the second ARP packet with the IP address

Received InterfaceName

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

Received VLAN

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

Received INNER-VLAN

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

Collision Type

IP address conflict type

VB

VB OID

VB Name

VB Index

1.3.6.1.4.1.2011.5.25.123.1.28.1

hwEthernetARPIPConflictIPAddress

None

1.3.6.1.4.1.2011.5.25.123.1.28.2

hwEthernetARPIPConflictLocalInterfaceName

None

1.3.6.1.4.1.2011.5.25.123.1.28.3

hwEthernetARPIPConflictLocalMAC

None

1.3.6.1.4.1.2011.5.25.123.1.28.4

hwEthernetARPIPConflictLocalVLAN

None

1.3.6.1.4.1.2011.5.25.123.1.28.5

hwEthernetARPIPConflictLocalCEVLAN

None

1.3.6.1.4.1.2011.5.25.123.1.28.6

hwEthernetARPIPConflictReceiveInterfaceName

None

1.3.6.1.4.1.2011.5.25.123.1.28.7

hwEthernetARPIPConflictReceiveMAC

None

1.3.6.1.4.1.2011.5.25.123.1.28.8

hwEthernetARPIPConflictReceiveVLAN

None

1.3.6.1.4.1.2011.5.25.123.1.28.9

hwEthernetARPIPConflictReceiveCEVLAN

None

1.3.6.1.4.1.2011.5.25.123.1.28.10

hwEthernetARPIPConflictType

None

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 4: The source IP address in an ARP packet is 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, go to step 2.
    • If the devices or users using the same IP address cannot be identified, go to step 3.

  2. Run the ip address command to change the IP address of one device or user. Then check whether there is any alarm generated for IP address conflict.

    • If there is any IP address conflict, go to step 3.
    • If there is no IP address conflict, go to step 4.

  3. Collect trap, log, and configuration information, and contact technical support personnel..
  4. End.
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Updated: 2019-03-20

Document ID: EDOC1000166558

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