04-03-2008 02:10 AM - edited 03-05-2019 10:09 PM
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
04-03-2008 06:38 AM
Hi,
What switch model/engine?
You have a high Kernel and Idle, Switching OVerhead, and Admin Overhead processes.
Check this link http://www.cisco.com/warp/public/473/82.html
Regards,
Dandy
04-03-2008 06:43 AM
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
04-03-2008 09:14 AM
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
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