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Cisco Router CPU load too high

Hi,

I have a Cisco 3700 Router routing about 20 Mbps of data. Should be powerfull enough for that, but I have increase of CPU load, and I don't know why.

The proccesses and CPU of each are shown below, and I have noticed that the added % of the processees is much less that the total, any hint?

The router routes multicast and unicast traffic, and no loops had been found.

CPU utilization for five seconds: 76%/47%; one minute: 79%; five minutes: 81%
PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process
1 0 1 0 0.00% 0.00% 0.00% 0 Chunk Manager
2 96 1410 68 0.00% 0.00% 0.00% 0 Load Meter
3 8 245 32 0.00% 0.00% 0.00% 0 CEF Scanner
4 0 1 0 0.00% 0.00% 0.00% 0 EDDRI_MAIN
5 6168 885 6969 0.00% 0.04% 0.04% 0 Check heaps
6 684 1041 657 0.00% 0.00% 0.00% 0 Pool Manager
7 0 1 0 0.00% 0.00% 0.00% 0 AAA_SERVER_DEADT
8 0 2 0 0.00% 0.00% 0.00% 0 Timers
9 0 2 0 0.00% 0.00% 0.00% 0 Serial Backgroun
10 4 118 33 0.00% 0.00% 0.00% 0 IPC Dynamic Cach
11 0 1 0 0.00% 0.00% 0.00% 0 IPC Zone Manager
12 72 7028 10 0.00% 0.00% 0.00% 0 IPC Periodic Tim
13 40 7027 5 0.00% 0.00% 0.00% 0 IPC Deferred Por
14 0 1 0 0.00% 0.00% 0.00% 0 IPC Seat Manager
15 0 1 0 0.00% 0.00% 0.00% 0 IPC BackPressure
16 0 2 0 0.00% 0.00% 0.00% 0 AAA high-capacit
17 0 1 0 0.00% 0.00% 0.00% 0 OIR Handler
18 0 236 0 0.00% 0.00% 0.00% 0 Environmental mo
19 564 2002 281 0.00% 0.00% 0.00% 0 ARP Input
20 72 1761 40 0.00% 0.00% 0.00% 0 HC Counter Timer
21 0 2 0 0.00% 0.00% 0.00% 0 DDR Timers
22 0 2 0 0.00% 0.00% 0.00% 0 Entity MIB API
23 0 2 0 0.00% 0.00% 0.00% 0 ATM Idle Timer
24 0 1 0 0.00% 0.00% 0.00% 0 SERIAL A'detect
25 56 7026 7 0.00% 0.00% 0.00% 0 GraphIt
26 0 2 0 0.00% 0.00% 0.00% 0 Dialer event
27 0 1 0 0.00% 0.00% 0.00% 0 Critical Bkgnd
28 236 2297 102 0.00% 0.00% 0.00% 0 Net Background
29 0 96 0 0.00% 0.00% 0.00% 0 Logger
30 240 7022 34 0.00% 0.00% 0.00% 0 TTY Background
31 360 7026 51 0.00% 0.00% 0.00% 0 Per-Second Jobs
32 0 1 0 0.00% 0.00% 0.00% 0 Inode Table Dest
33 0 1 0 0.00% 0.00% 0.00% 0 OIR Refresh Proc
34 0 1 0 0.00% 0.00% 0.00% 0 AggMgr Process
35 0 2 0 0.00% 0.00% 0.00% 0 SM Monitor
36 0 1 0 0.00% 0.00% 0.00% 0 HDV background
37 0 2 0 0.00% 0.00% 0.00% 0 VNM DSPRM MAIN
38 0 1 0 0.00% 0.00% 0.00% 0 DSPFARM DSP READ
39 8 1175 6 0.00% 0.00% 0.00% 0 mxt5100
40 0 2 0 0.00% 0.00% 0.00% 0 ESWILPPM
41 0 1 0 0.00% 0.00% 0.00% 0 sal_dpc_process
42 0 2 0 0.00% 0.00% 0.00% 0 Net Input
43 136 1410 96 0.00% 0.00% 0.00% 0 Compute load avg
44 2304 159 14490 0.00% 0.00% 0.00% 0 Per-minute Jobs
45 0 236 0 0.00% 0.00% 0.00% 0 Call Management
46 0 1 0 0.00% 0.00% 0.00% 0 CES Line Conditi

Thank you in advance.

NicBrey

Multicast routing does use CPU power, but agree, the router should handle it...
Have you noticed an increase in traffic over your lines?? Do you know what type of traffic is going through the router? Reason I'm asking is that there might be a virus infection on your network that sends loads of ICMP or other packets through the router. Are you sure that your network is virus/worm free and patched with latest security patches?? It might not be a router issue...

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Steve Jennings

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sheahmed

bulk of traffic is ok, but heavy burst of packets cause cpu load shoot up ... there may be any virus OR policy routing? OR any access list for inbound traffic OR IP Accounting OR Logg Buffering of Access Lists which produce heavy logs... there are many reasons ...

go step by step ... first see your traffic is virus free and you are not relaying any virus generated abnormal traffic, then evalute access lists etc ...

good luck ...

Sheeraz Ahmed