SECE_1.3.6.1.4.1.2011.5.25.165.2.2.2.12 hwARPMissSIPSpeedLimitALarm

Description

SECE/4/ARPMISS_SIP_SPEEDLIMIT_ALARM: OID [oid] The arp-miss packet speed with source ip [OCTET] exceed the speed-limit value configured [INTEGER].

The rate of ARP Miss messages with the specified source IP address exceeds the configured alarm threshold.

Attribute

Alarm ID	Alarm Severity	Alarm Type
1.3.6.1.4.1.2011.5.25.165.2.2.2.12	Warning	equipmentAlarm(5)

Parameters

Name	Meaning
oid	Indicates the MIB object ID of the alarm.
OCTET	Indicates the source IP address of packets.
INTEGER	Indicates the alarm threshold.

Impact on the System

If the alarm is generated, the user traffic volume exceeds the threshold. The device discards excess traffic. As a result, user traffic may be interrupted intermittently.

Possible Causes

If a host sends a large number of IP packets with unresolvable destination IP addresses to attack a device (the device has a route to the destination IP address of a packet but has no ARP entry matching the next hop of the route), the device generates a large number of ARP Miss messages. When the rate of ARP Miss messages with the specified source IP address exceeds the alarm threshold, the device generates the alarm.

Procedure

Run the reset cpu-defend statistics command to clear statistics on the ARP Miss messages sent to the CPU.
Wait for 1 minute, and run the display cpu-defend statistics all command to check the number of ARP Miss messages sent to the CPU within 1 minute. Check whether a large number of packets are discarded:
- If so, locate the attack source according to the IP address in the alarm information and check whether the attack source is attacked by viruses.
  - If so, you are advised to remove viruses from the user host. You can also add the address of the user to the blacklist or configure a blackhole MAC address entry to discard ARP request packets sent by the attacker.
  - If not, go to step 3.
- If not, verify that the network is secure and use either of the following methods to prevent generation of this alarm:
  - Run the arp-miss speed-limit source-ip [ ip-address ] maximum 0 command to disable the rate limit on ARP Miss messages based on source IP addresses.
    - If ip-address is not specified, ARP Miss message rate limiting is disabled for all source IP addresses. If a large number of ARP Miss messages are generated for a certain source IP address, the CPU usage may be excessively high.
    - If ip-address is specified, ARP Miss message rate limiting is disabled for this source IP address. If a large number of ARP Miss messages are generated for the source IP address, the CPU usage may be excessively high.
  - Run the info-center source SECE channel 4 log state off command to disable the device from sending SECE alarm information.
Run the display arp anti-attack configuration arpmiss-speed-limit command to check the configuration of source-based ARP-Miss suppression.
Run the arp-miss speed-limit source-ip [ ip-address ] maximum maximum command to modify the maximum rate of ARP Miss messages based on the site requirements.
If the alarm is frequently generated, collect alarm information and contact technical support personnel.