while we were applying Save configuration command at NE40E its software version is VRP (R) software, Version 5.60 (NE40E&80E V300R006C01SPC003) we found that the CPU reach 99 % , and service affected.
The root cause is that many users connect to this router with many VTY sessions and the router has 40007 command line , so many users use the command save which will consume more CPU resources to copy the configration to the CFCARD .
as shown in the log if the NE40E :
we found that a user named XYZ issused a command of " save" to save the current configuration to the NE40E CFCARD, but issue command of save ,
Nov 4 2010 11:19:58 RMS-NPE-NE40E-01 %%01SRM/4/CPUMEMALARM(l):Board 10 CPU usage is Upper than threshold.
Nov 4 2010 11:19:58 RMS-NPE-NE40E-01 %%01VOSCPU/4/CPU_USAGE_HIGH(l):The CPU is overloaded, and the tasks with top three CPU occupancy are VT6 , ROUT, TRAP. (CpuUsage=99%, Threshold=95%)
Nov 4 2010 11:18:55 RMS-NPE-NE40E-01 %%01SHELL/5/CMDRECORD(l):Record command information. (Task=VT6 , Ip=10.74.0.20, User= XYZ , Command="save")
___ Where VT6 equlas too VTY 6 ._____
suggest for such cenario :
1) Organize the VTY connection to the users.
2) use high speed and large size CFCARDs.