New Flex 500 has a huge CPU usage

Raymond

We migrate from a USG110 (4.33) to a Flex 500 (5.02) via the Zyxel Configuration Convertor tool. Now we are using the new Flex 500 for a week now. Many users in our network complains about the performance of the network. VPN is slow and VOIP is stuttering for example. The CPU usage is over the 50% in idle stage and sometimes about 95% when downloading a file.

Some people complains in the past too after the upgrade of the USG110 from 4.33 to 4.62. When we downgrade the firmware back to 4.33 the performance was a lot better then.

Any suggestions to improve the performance?

Zyxel_Can

Hi @Raymond,

In order to clarify the issue please share some information with us:

1- Please share your USG FLEX500's startup-config.conf file with me by private message.

2- Please execute following commands when it's in idle state and when your USG FLEX500's CPU is high share the command output with me by private message:

Router> debug system ps
Router> show cpu average
Router> show cpu all
Router> show cpu status

3- When USG FLEX500's CPU is over utilized, please collect diagnostic log under Maintenance > Diagnostics > Collect Now menu, and provide me diagnostic logs by private message.

Raymond

I updated the Flex 500 with the Weekly update and now is the CPU usage in idle around the 10%. Much better.