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CPU Usage of an AR3260 Is Too High

Latest reply: Dec 27, 2018 07:57:34 2384 6 0 0 0

Hello everyone,

Today I will share with you how to deal with high CPU usage.

Fault Symptom
After devices in the core equipment room of a stadium in the UK were deployed, the AR3260 system responded slowly and the system CPU usage exceeded 70% in the case of a few services. After detailed information was checked, the CPU usage of the SNMP module reached about 40% to 50%.
Alarm Information
None
Troubleshooting Procedure
1. Run the display snmp-agent statistics command to view SNMP statistics. The command output shows that the device received a large number of SNMP packets but did not process these packets because the number of packets exceeded the buffer queue capacity. As a result, error statistics were collected.
2. Capture packet information, finding that the device received a lot of getbulk packets and that the source address of these packets is not the eSight address of the internal network but a public IP address. Therefore, these packets may be attack packets from the public network.
CPU Usage of an AR3260 Is Too High-2516117-1
Root Cause
The device uses the default read-write community name. On the gateway's outbound interface, you can view many SNMP-getbulk packets carrying the public source IP address. These packets are suspected to be attack packets. As a result, the device keeps processing these packets.
Summary and Suggestions
Modify the read-write attribute to solve the problem. During live-network deployment, do not use default parameter values.

That is all I want to share with you! Thank you!

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gululu
Created Oct 9, 2017 05:48:09

thanks
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WoodWood
Created Oct 9, 2017 10:34:59

good
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xiaomumu
Created Dec 24, 2018 02:13:18

This post was last edited by xiaomumu at 2018-12-27 01:38. The AR3260 system is slow to respond. Is this the reason of the system itself? Or something else?
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bahjat1990
Created Dec 24, 2018 15:25:39

It's useful
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3li
Created Dec 25, 2018 15:23:29

Thanks you
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dagui
Created Dec 27, 2018 07:57:34

The command output shows that the device received a large number of SNMP packets but did not process these packets because the number of packets exceeded the buffer queue capacity. As a result, error statistics were collected.How do you understand this sentence?
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