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memory (System)


Hierarchy Level


Configure the memory monitoring system on your PTX and MX Series routers. The memory monitoring system on your device monitors anomalies with respect to the memory utilization of Junos applications and overall system in the control plane of your device. Apart from monitoring the system memory, you can also configure the device to monitor the per-process memory footprint as well to help detect possible leaks and take configured action.

Memory can be exhausted when there is over scaling, for instance when you test a high scale on a device that does support the scale because of physical resource limitations. Memory can also be exhausted when there are temporary spikes for example when a new FIB object is added before the older FIB objects are deleted. These temporary spikes are usually transient and resolve after a while. Also, a memory leak in any one of the applications or even in the kernel can lead to memory exhaustion. So, it is necessary that you monitor memory usage across applications and the kernel.

The remaining statements are explained separately.

Required Privilege Level

system—To view this statement in the configuration.

system-control—To add this statement to the configuration.

Release Information

Statement introduced in Junos OS Release 20.1R1.