No relevant resource is found in the selected language.

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies. Read our privacy policy>

Reminder

To have a better experience, please upgrade your IE browser.

upgrade

Cyclic CPU overload happens everyday at the same time by process FIB

Publication Date:  2013-04-04 Views:  16 Downloads:  0
Issue Description
Every night "CPU overload" messages appeared in the logs.
Handling Process
Several month at the same time CPU overload happened on device

Feb 21 2013 00:02:07.800.2+04:00 MAH-PE-NE40E-1 %%01VOSCPU/4/CPU_USAGE_HIGH(l):Slot=2;The CPU is overloaded(CpuUsage=86%, Threshold=80%), and the tasks with top three CPU occupancy are:
FIB   total      : 71%
NonDopraTask(k)  total      : 10%
IPCR  total

Feb  7 2013 00:01:26.600.3+04:00 MAH-PE-NE40E-1 %%01VOSCPU/4/CPU_USAGE_HIGH(l):The CPU is overloaded(CpuUsage=81%, Threshold=80%), and the tasks with top three CPU occupancy are:
FIB   total      : 44%
IPCR  total      : 6%
LDP   total      : 4%


Nov 25 2012 00:01:41.350.3 MAH-PE-NE40E-1 %%01VOSCPU/4/CPU_USAGE_HIGH(l):The CPU is overloaded(CpuUsage=85%, Threshold=80%), and the tasks with top three CPU occupancy are:
FIB   total      : 68%
IPCR  total      : 8%
LDP   total      : 5%

Nov 14 2012 00:01:32.850.3 MAH-PE-NE40E-1 %%01VOSCPU/4/CPU_USAGE_HIGH(l):The CPU is overloaded(CpuUsage=84%, Threshold=80%), and the tasks with top three CPU occupancy are:
FIB   total      : 38%
IPCR  total      : 5%
ROUT  total      : 5%

On 13, November there was software upgrade. Before it such messages appeared too but at another time:

Oct  5 2012 23:57:16.740.2 MAH-PE-NE40E-1 %%01VOSCPU/4/CPU_USAGE_HIGH(l):The CPU is overloaded, and the tasks with top three CPU occupancy are FIB (55%), IPCR(12%), STND(12%). (CpuUsage=83%, Threshold=80%)

Sep 14 2012 23:58:57.440.2 MAH-PE-NE40E-1 %%01VOSCPU/4/CPU_USAGE_HIGH(l):The CPU is overloaded, and the tasks with top three CPU occupancy are FIB (61%), STND(7%), IPCR(5%). (CpuUsage=81%, Threshold=80%)


FIB stands for Forwarding Information Base. So such high CPU usage can be caused by routes learning or another update of forwarding infoermation.
But nor debug, nor capturing, nor observing the network show us any suspicious event. So only way is ask R&D.
Root Cause
According to information provided by R&D it is 24-hour cycle of synchronization between routing table abd FIB. It will happen each day at the same time.

There is no reason to worry about it.
Solution
This is normal and wil not cause any trouble in network. So customer shouldn't worry about this messages while FIB is a highest process.

END