Overview CPU Protection

There are lots of protocol packets in the device that need to be sent to CPU for processing and we need to specify the queue for each kind of protocol packets. The CPU protection function classifies the protocol packets sent to CPU and the packets enter different CPU queues according to the different protocol priorities. We can set the rate limitation of each queue.

The device totally has eight queues, numbering from 0 to 7. They adopt the strict priorities. The smaller the number is, the lower the priority is. That is to say, the priority of queue 0 is the lowest and the priority of queue 7 is the highest. The packets in the queue with the high priority are earlier sent to the CPU for processing that the packets in the queue with low priority. We can specify them to different priorities of queues according to the importance of each kind of packets, ensuring that the important packets are first sent to the CPU for processing.

Meanwhile, the device can perform the rate limitation for the packets entering each CPU queue, preventing the vicious protocol packet attack in the network from causing the too high CPU utilization of the device and resulting in the abnormal running of the device.