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Alarm Handling

AR100, AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 V200R010

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_1.3.6.1.4.1.2011.5.25.123.2.1 hwEthernetARPSpeedLimitAlarm

ARP_1.3.6.1.4.1.2011.5.25.123.2.1 hwEthernetARPSpeedLimitAlarm

Description

ARP/4/ARP_SUPP_TRAP:OID [OID] Exceed the speed limit value configured. (Ifnet index=[INTEGER], Configured value=[COUNTER], Sampling value=[COUNTER], Speed-limit type=[OCTET], Source Ip address=[IPADDR], Destination Ip address=[IPADDR], VPN-Instance name=[OCTET]).

The trap was generated when the transmitting rate of ARP packets or ARP Miss Messages was greater than the rate limit. You can run the arp speed-limit source-ip command to set the rate limit. The default rate limit is 500 bit/s.

Attribute

Alarm ID Alarm Severity Alarm Type

1.3.6.1.4.1.2011.5.25.123.2.1

Warning

processingErrorAlarm(4)

Parameters

Name Meaning

OID

Indicates the MIB object ID of the alarm.

Ifnet index

Indicates the interface index.

Configured value

Indicates the configured rate limit.

Sampling value

Indicates the sampling of the number of packets received within a period.

Speed-limit type

Indicates the type of packets configured with timestamp suppression, for example, ARP and ARP Miss.

Source Ip address

Indicates source IP addresses.

Destination Ip address

Indicates the destination IP address.

VPN-Instance name

Indicates the VPN instance name.

Impact on the System

View the type of packets configured with timestamp suppression in trap messages.

If ARP packets are configured with timestamp suppression, some normal ARP packets are discarded. As a result, traffic cannot be forwarded normally.

If ARP Miss messages are configured with timestamp suppression, some ARP Miss messages are discarded. As a result, ARP Request messages cannot be triggered and thus traffic cannot be forwarded normally.

If this trap is cleared shortly, services will not be affected and the system will resume the normal operation.

If this trap is not cleared for a long time, the service processing capability of the system will be affected.

Possible Causes

1:

The interval for enabling the log function and sending traps for potential attack behaviors was set to Ns. Within the period of N+1s, the number of sent ARP packets was greater than the threshold. Within the first Ns, the average number of sent ARP packets was greater than the threshold.

2:

The interval for enabling the log function and sending traps for potential attack behaviors was set to Ns. Within the period of N+1s, the number of sent ARP Miss messages was greater than the threshold. Within the first Ns, the average number of sent ARP Miss messages was greater than the threshold.

Procedure

  1. Check the type of packets with timestamp suppression configured in trap messages.

    • If the type of packets is ARP, go to Step 2.
    • If the type of packets is ARP Miss, go to Step 4.

  2. Run the command to obtain the ARP rate limit value on .
  3. Run the command to reconfigure the maximum value for timestamp suppression of ARP packets. This value must be greater than the value obtained in Step 2 but must be less than ; otherwise, the trap cannot be cleared. Check whether the trap is cleared.
  4. Collect alarm information and configuration information, and then contact technical support personnel.
  5. End.

Related Information

None

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Updated: 2019-08-12

Document ID: EDOC1100034065

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