Proc CPU hit to 96%

Unanswered Question
Apr 3rd, 2008
User Badges:

Hi NetPro,


does anyone who encountered this problem before ? show proc cpu hit to 96% .


what is the most common problem caused this ?


CPU utilization for five seconds: 82.56%

one minute: 69.16%

five minutes: 65.30%


PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process

--- ----------- ---------- -------- ------- ------- ------- --- ---------------

1 3119734053 0 0 17.44% 30.84% 34.70% -2 Kernel and Idle

23 287829042 45111228 55000 4.45% 4.00% 4.00% -2 SptBpduRx

24 79253724 7987102 39000 1.53% 1.92% 1.98% -2 SptBpduTx

28 565262007 169065436 10000 7.97% 9.76% 9.95% -2 McastRx

38 44394 3705 42000 3.77% 3.00% 3.00% -2 Acct Send Bkg

147 33486 442 41000 5.23% 6.84% 6.96% 1084656276 telnet147

193 580308540 989270583 12783 7.43% 7.66% 7.47% 0 Packet forwardi

194 1601268361 400927856 8696 28.78% 26.46% 25.23% 0 Switching overh

195 497364026 527775876 24650 6.09% 6.18% 6.17% 0 Admin overhead


your reply will be highly appreciated.


regards,

jack

  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 2.3 (3 ratings)
Loading.
ney25 Thu, 04/03/2008 - 06:43
User Badges:

hi dandy,


the switch model is 4506 and running on Sup2


what do you think of the consequences causing switch hit to 96% ?


thanks.


regards,

jack

Danilo Dy Thu, 04/03/2008 - 09:14
User Badges:
  • Blue, 1500 points or more

Well from the document it mentioned the MAC address.


1. It can be done by flushing the MAC address table. But if the CPU is high all the time, I don't think someone is too free to keep doing that 24x7.

2. The switch may have flapping connection to another switch which in turn connected to a lot of hosts - which makes the MAC Addresses widthrawn and re-learned.


If its a L3 switch, look at routing loop. Routing loop can happen both in Static and Dynamic routing. One way to avoid this is to create a NULL interface and route shorter prefix of your entire network to it.


You can check on attacks also by performing sniffing (Wireshark) in your trunk.


Regards,

Dandy

Actions

This Discussion