Disabling OSPFv3 Memory Overload Control

By default, OSPFv3 memory overload control is enabled. When the system memory is overloaded, each module needs to take necessary measures to control the memory usage. Upon receiving a memory overload notification from the system, the OSPFv3 module no longer imports new routes and starts to control neighbor relationship establishment based on the memory overload condition to enhance OSPFv3 resilience. In this case, new neighbor relationships cannot be established. For existing neighbor relationships, if they are in the Full state, they will be retained; if they are in a non-Full state, they are not reestablished until the memory recovers from overload.