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What can I do when there is a memory shortage even after a swap?
It is not recommended for the system to operate in this state, notwithstanding the existence of swap. The protocols that run in the routing protocol process usually have a real-time requirement that cannot reliably withstand the latency of being swapped to hard disk. If the memory shortage has not resulted from a memory leak, then either a reduction in the memory usage or an upgrade to a higher memory-capacity Routing Engine is required.
For more information, see Junos OS Routing Protocols Library for Routing Devices