04-11-2010 05:05 AM - edited 03-06-2019 10:33 AM
Dear all
i have 4507R with two Supervisor (IV WS-X4515)
i have strage CPU utilization it move from around 25% to around 70% then again to around 25%
from the show processes cpu command
the change happen in this two processes only (this my only 2 unstable cpu process)
Cat4k Mgmt HiPri
Cat4k Mgmt LoPri
then i check with the command
show platform health
i notice this two thing which is always 30% and 10% , also no other things higher then 4%
K2CpuMan Review 30.00 11.87 30 83 100 500 14 11 10 583:25
K2AccelPacketMan: Tx 10.00 1.86 20 0 100 500 2 1 1 81:28
S2w-JobEventSchedule 10.00 0.18 10 6 100 500 0 0 0 11:51
Stub-JobEventSchedul 10.00 2.06 10 76 100 500 2 2 1 113:16
i already check this doucment
http://www.cisco.com/en/US/products/hw/switches/ps663/products_tech_note09186a00804cef15.shtml
which not help that much because
1- i am using MSTP ( my network is 180 switchs) my 4507 is the BACKBONE
2- i already use portfast with BPDU filter ( my Spanning tree proceess is stable with less the 2% cpu proceess)
3- i dont have IPX
4-i dont have any access-list with LOG keywork in it
finally i use this command
sh platform cpu packet statistics
here is part of the command
Packets Received by Packet Queue
Queue Total 5 sec avg 1 min avg 5 min avg 1 hour avg
---------------------- --------------- --------- --------- --------- ----------
Esmp 19095201 55 48 43 34
Control 2203955 7 1 2 0
Host Learning 11682231 0 0 0 12
L3 Fwd Low 1421178 3 0 1 0
L2 Fwd Low 74638357 202 525 262 136
L3 Rx Low 6333218 67 63 52 43
RPF Failure 21 0 0 0 0
ACL fwd(snooping) 5466762 19 14 13 11
ACL log, unreach 139918 0 0 0 0
ACL sw processing 146 0 0 0 0
i can't interpert this part of the out put or clear it without reloading the switch
can any one help me with that ?
04-14-2010 06:51 AM
Hi,
The ouput you have given shows the normal cpu utilization.Please paste the output when cpu utilization is 75% so that we can come on the result which component is actully causing the cpu high utilization.
We have 2 main components which generaly cause High CPU utilization.
K2CpuMan:- It show CPU bound traffic.
K2L2:- These processes are responsible for maintenance of the various L2 tables.
A switch might experience high CPU utilization due to the Cat4k Mgmt LoPri process and the K2CpuMan and K2L2 Address Table reviews (using the show platform health command. High CPU utilization does not impact the traffic switched in hardware.
The problem is seen when a large MAC address table exists and when the switch is frequently relearning MAC addresses on multiple VLANs.
Plz check the loggs as well if any mac address flood is thr in.
Thanks/bhisham
04-14-2010 07:49 AM
Observe few things
1. capture the trend of CPU utilization with any SNMP tool monitoring
2. Capture and share logs of the switches
3. Check is there any frequent topology change either due to L-2 /L-3 loop or similar problem
4. share output of sh ver to see for bugs with IOS if any
Once you share we can have view what could be reason
04-18-2010 02:47 AM
dear all
first Thank you for ur replay , i realy appreachet your effort
before i start let me attech my show version .
i figure out something which make my CPU more stable but not yet normal
As u all know that i m using MST spanning tree and i have more then 180 switch in my network my solution which i figure it out
is enable portfast in all user connection in all the 180 switch which help my because
as enabling portfast will not generate BPDU Topology change ( will make the switch in the clear the mac-address-table)
after doing this my process cpu is better but still up and down but with less frequency
check me output (attached) of
sh processes cpu | ex 0.00% 0.00% 0.00%
i keep entering this command during the 20 sec of high cpu to make u see the output
this output happen every around 90 sec as you see i keep entering this command then it back to normal state around 35% process for 90 sec and so on
also regarding the output of this command
sh platform cpu packet statistics
my output
Queue Total 5 sec avg 1 min avg 5 min avg 1 hour avg
---------------------- --------------- --------- --------- --------- ----------
Esmp 19700188 54 50 42 32
Control 2636521 7 4 1 0
Host Learning 4742955 0 0 0 2
L3 Fwd Low 918530 3 2 0 0
L2 Fwd Low 30051692 112 114 131 91
L3 Rx Low 3555892 21 13 12 4
RPF Failure 2 0 0 0 0
ACL fwd(snooping) 2635551 12 7 6 0
ACL log, unreach 83459 0 0 0 0
ACL sw processing 4 0 0 0 0
which i still don't understand why my L2 Fwd Low and Esmp is high
although my Host leaning is now appear to be normal
can any one let me know what is ESMP is ?
thanks
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