3Com 3031 Command Reference Manual page 685

Route Capacity Configuration Commands 685
The safety-value in the command must be more than the current idle memory
lower limit, and otherwise the configuration will fail.
This command can be used with memory limit command to change the safety
value and lower limit of the router idle memory. The safety-value must be more
than the limit-value in the command, and otherwise the configuration will fail.
For the related commands, see memory auto-establish disable, memory
auto-establish enable, memory limit, and display memory limit.
Example
Set the safety value of the router to 35Mbytes.
[3Com] memory safety 35
[3Com]
%8/19/2002 16:35:41-RM-5-RTLOG:You have changed the memory
limit/safety value
Set the lower limit of the router idle memory to 25Mbytes and the
safety value to 30Mbytes.
[3Com] memory safety 35 limit 25
[3Com3Com]
%8/19/1995 15:45:58-RM-5-RTLOG:Changed the system memory
limit(20->25)/ safety(30->35) successfully