Excessive Flow of USG2016 Causes The CPU Usage is High

Publication Date:  2012-09-13 Views:  217 Downloads:  0
Issue Description
Some clients send feedback that it delays for a long time to access to the external network when using USG160 acting as gateway to external. View the performance, it shows the CPU usage is 96%
Alarm Information
Excessive flow
Handling Process
1、 view the CPU usage, it is 96%;
2、 view the CPU in hide mode, find SOCK occupy 60% which is device forwarding occupation of CPU;
3、 view the interface, discover it has basically reached broadband upper limit;
4、 do IP-CAR rate limit operation of internal network, control the whole network flow;
5、 do rate limit successfully, CPU usage declines to 55%, and the rate to visit external network is normal.
Root Cause
USG2100’s CPU is single-core, it is used to manage device and forward data, so the performance reaches broadband upper limit easily. It can do flow control or not log in to device when business is busy to avoid that CPU reaches the upper limit.