Cisco Router 100% cpu utilization

[dien9]

I run #sh proc cpu, can see:

CPU utilization for five seconds: 100%/81%; one minute: 87%; five minutes: 80%

but I cannot find in the any high cpu process according to the PID.

Do you know why?

The high cpu utilization make the logn ping time even timeout.

[dien9]

It normally over 80% but I cannot find which process has high CPU, all process around 0.xx%.

When the BGP Scanner run, it touch 100%. I think BGP Scanner run is normal, just don't know what process already occupy 80% cpu usage.

[jens.boberg]

Hi, if you use the "show proc cpu sorted" command you would get the list sorted with the highest % at the top, would be easier to see if you might have just missed it.

And next question, what kind of router do you have, and what does it do.

[spremkumar]

Hi

Can you paste the output of show processes cpu and show processes cpu sorted ?

regds

[dien9]

show processes cpu sorted not work.

here is sh proc cpu.

CPU utilization for five seconds: 73%/70%; one minute: 75%; five minutes: 75%

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

1 81836 3758931 21 0.00% 0.00% 0.00% 0 Load Meter

2 23032 102191 225 0.00% 0.00% 0.00% 0 BGP Open

3 341455556 17305788 19730 3.19% 1.31% 0.90% 0 Check heaps

4 0 1 0 0.00% 0.00% 0.00% 0 Chunk Manager

5 0 1 0 0.00% 0.00% 0.00% 0 Pool Manager

6 0 2 0 0.00% 0.00% 0.00% 0 Timers

7 0 2 0 0.00% 0.00% 0.00% 0 Serial Backgroun

8 0 1 0 0.00% 0.00% 0.00% 0 OIR Handler

9 0 1 0 0.00% 0.00% 0.00% 0 IPC Zone Manager

10 168416 18632593 9 0.00% 0.00% 0.00% 0 IPC Periodic Tim

11 16412644 90042477 182 0.00% 0.01% 0.00% 0 IPC Seat Manager

12 48529536 161586057 300 0.00% 0.05% 0.06% 0 ARP Input

13 126740 4418015 28 0.00% 0.00% 0.00% 0 HC Counter Timer

14 0 2 0 0.00% 0.00% 0.00% 0 DDR Timers

15 0 2 0 0.00% 0.00% 0.00% 0 Dialer event

16 0 1 0 0.00% 0.00% 0.00% 0 Entity MIB API

17 0 1 0 0.00% 0.00% 0.00% 0 SERIAL A'detect

18 0 1 0 0.00% 0.00% 0.00% 0 Microcode Loader

19 0 1 0 0.00% 0.00% 0.00% 0 Critical Bkgnd

20 366588 2162867 169 0.00% 0.00% 0.00% 0 Net Background

21 2448 5903 414 0.00% 0.00% 0.00% 0 Logger

[dien9]

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

22 455708 18632592 24 0.00% 0.00% 0.00% 0 TTY Background

23 5114892 18632606 274 0.00% 0.00% 0.00% 0 Per-Second Jobs

24 0 1 0 0.00% 0.00% 0.00% 0 IP Crashinfo Inp

25 0 1 0 0.00% 0.00% 0.00% 0 DSX3MIB ll handl

26 651116 18632606 34 0.00% 0.00% 0.00% 0 RSP Background

27 0 1 0 0.00% 0.00% 0.00% 0 Memory Scanner

28 10000 313151 31 0.00% 0.00% 0.00% 0 Slave Time

29 0 1 0 0.00% 0.00% 0.00% 0 Slave IPC OIR

30 0 1 0 0.00% 0.00% 0.00% 0 IP Flow Backgrou

31 555272 5313532 104 0.00% 0.00% 0.00% 0 Chassis Daemon

32 14176 313261 45 0.00% 0.00% 0.00% 0 RSP Chassis Back

33 230276 8566073 26 0.00% 0.00% 0.00% 0 MIP Mailbox

34 0 1 0 0.00% 0.00% 0.00% 0 vcq_proc

35 0 1 0 0.00% 0.00% 0.00% 0 CT3 Mailbox

36 0 1 0 0.00% 0.00% 0.00% 0 CE3 Mailbox

37 15846032 150310228 105 0.00% 0.03% 0.00% 0 IPC CBus process

38 0 2 0 0.00% 0.00% 0.00% 0 ATM OAM Input

39 0 2 0 0.00% 0.00% 0.00% 0 ATM OAM TIMER

40 17328 3781463 4 0.00% 0.00% 0.00% 0 ATM Periodic

41 0 1 0 0.00% 0.00% 0.00% 0 ATM ARP INPUT

42 209044 18647818 11 0.00% 0.00% 0.00% 0 ATM PA Helper

43 95274268 230013457 414 0.49% 0.22% 0.19% 0 IP Input

[dien9]

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

44 352 178 1977 0.00% 0.01% 0.00% 2 Virtual Exec

45 0 1 0 0.00% 0.00% 0.00% 0 PPP IP Add Route

46 0 1 0 0.00% 0.00% 0.00% 0 X.25 Encaps Mana

47 0 1 0 0.00% 0.00% 0.00% 0 MPC Router Proce

48 0 2 0 0.00% 0.00% 0.00% 0 SSCOP Input

49 0 2 0 0.00% 0.00% 0.00% 0 SSCOP Output

50 24580 313263 78 0.00% 0.00% 0.00% 0 SSCOP Timer

51 46046448 315738 145842 1.31% 0.17% 0.12% 0 IP Background

52 0 2 0 0.00% 0.00% 0.00% 0 ILMI Input

53 0 1 0 0.00% 0.00% 0.00% 0 SNMP Timers

54 0 2 0 0.00% 0.00% 0.00% 0 ILMI Request

55 0 2 0 0.00% 0.00% 0.00% 0 ILMI Response

56 0 1 0 0.00% 0.00% 0.00% 0 ILMI Timer Proce

57 8 2 4000 0.00% 0.00% 0.00% 0 ATM PVC Discover

58 0 2 0 0.00% 0.00% 0.00% 0 ATMSIG ILMI Time

59 283240 18632626 15 0.00% 0.00% 0.00% 0 ATMSIG Timer

60 0 2 0 0.00% 0.00% 0.00% 0 ATMSIG Input

61 0 2 0 0.00% 0.00% 0.00% 0 ATMSIG Client

62 615912 315740 1950 0.00% 0.00% 0.00% 0 Adj Manager

63 48 228 210 0.00% 0.00% 0.00% 0 TCP Listener

64 484048 10627573 45 0.00% 0.00% 0.00% 0 TCP Timer

65 640 769 832 0.00% 0.00% 0.00% 0 TCP Protocols

[dien9]

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

66 0 1 0 0.00% 0.00% 0.00% 0 Probe Input

67 0 19 0 0.00% 0.00% 0.00% 0 RARP Input

68 0 1 0 0.00% 0.00% 0.00% 0 HTTP Timer

69 0 1 0 0.00% 0.00% 0.00% 0 Socket Timers

70 1452784 3216909 451 0.00% 0.00% 0.00% 0 DHCPD Receive

71 20016248 327028 61207 0.00% 0.10% 0.06% 0 IP Cache Ager

72 0 1 0 0.00% 0.00% 0.00% 0 PAD InCall

73 0 2 0 0.00% 0.00% 0.00% 0 X.25 Background

74 0 1 0 0.00% 0.00% 0.00% 0 ISDN Timer

75 0 1 0 0.00% 0.00% 0.00% 0 Time Range Proce

77 0 1 0 0.00% 0.00% 0.00% 0 SYSMGT Events

78 0 1 0 0.00% 0.00% 0.00% 0 ISDNMIB Backgrou

79 0 1 0 0.00% 0.00% 0.00% 0 CallMIB Backgrou

80 0 1 0 0.00% 0.00% 0.00% 0 SNMP ConfCopyPro

81 116732 37017704 3 0.00% 0.00% 0.00% 0 cbus utilization

82 3093352 77067422 40 0.00% 0.00% 0.00% 0 Net Input

83 122552 3758941 32 0.00% 0.00% 0.00% 0 Compute load avg

84 6168412 313261 19691 0.00% 0.00% 0.00% 0 Per-minute Jobs

85 263892 127111 2076 0.00% 0.00% 0.00% 0 IP SNMP

86 136 219 621 0.00% 0.00% 0.00% 0 SNMP Traps

87 0 2 0 0.00% 0.00% 0.00% 0 IP NAT Ager

88 11323668 145384242 77 0.00% 0.02% 0.03% 0 IP-EIGRP Hello

[dien9]

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

92 2208 156974 14 0.00% 0.00% 0.00% 0 DHCPD Timer

93 74952 5323552 14 0.00% 0.00% 0.00% 0 DHCPD Database

94 2025236 15325450 132 0.00% 0.00% 0.00% 0 IP-EIGRP Router

95 30490304 79120443 385 0.00% 0.07% 0.06% 0 BGP Router

96 1942376 13666865 142 0.00% 0.00% 0.00% 0 BGP I/O

97 1231761996 5331444 231058 0.00% 3.02% 3.72% 0 BGP Scanner

98 27576 102219 269 0.00% 0.00% 0.00% 0 BGP Open

[Michael Stuckey]

This is a much cleaner way to get only the high processes.

show process cpu | exclude 0.00%__0.00%__0.00%

HTH,

Mike

[jens.boberg]

There is a very good document about troubleshooting high CPU caused by the BGP scanner

http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a00801c4f48.shtml

[dien9]

That may not caused by the BGP Scanner

[jens.boberg]

Sorry, I posted the link before I saw your output from the sh proc cpu.

Is there a lot of traffic going through your router?

Do you have some sort of debuging on,

use the "no debug all" just to make sure there isn't anything going on in the background.

What sort of router is it?

And what IOS do you have?

[spremkumar]

In addition to the above post are you seeing any logs in your router which indicates any spurious activities ..

regds

[stephtchoko]

There is cause of cpu overload:

- nat

- debug all (runing)

-bgp

please try

- activate ip cef, it'll reduce automatically cpu usage

- if nat is running, you can tun the nat

- if debug all is on, turn off the debug

- if it is bgp because too enougth routing information , you can filter the input information with prefix-list.

Best regards.