For firewall roles, when load gets too high, symptoms are increased latency and then packet loss.
For IPS, there is a "bypass on overload" feature which leaves connections un-inspected but passes them through when load is too high. This can be disabled in engine editor.
I have an additional question about this thread.
I would like to know the criteria what value does "high loading" means.
For example, "high loading" means
- CPU utilization reaches 98% over.
- Memory usage reaches 98% over.
Do you have any information about it?