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Community Member

High CPU Usage on Cisco 1941/K9

Hi All,

I have a problem with one of my main router. It consume a lot of CPU on it.

At first, I thought it was just an upload on my network but it seems like it lasted 3 days consuming my main WAN interface.
Upon check all the bandwidth usage on per VLAN, it doesn't reflect any. So I decided to check my trunk interface and WAN interface.
I'm using HSRP on my network.

Left side - my trunk port going to main switch
Right Side - my WAN interface going to internet

Upon checking on my PRTG, the router CPU consumption is different from my other Cisco 1941 Router. It uses a lot of CPU. 

CPU consumption changes anytime within the day. 

Here's my output for 
show processes cpu sorted

My question is, is there any wrong with my router or what should I do to lower the CPU consumption of it?

Thanks in advance.

Hall of Fame Super Gold

Post the complete output to

Post the complete output to the following commands: 

sh version; and 

sh proc cpu sort | ex 0.00

Community Member

Hi Leo, Here's the outputsh

Hi Leo, 
Here's the output
sh version

Cisco IOS Software, C1900 Software (C1900-UNIVERSALK9-M), Version 15.2(4)M6a, RELEASE SOFTWARE (fc1)
Technical Support:
Copyright (c) 1986-2014 by Cisco Systems, Inc.
Compiled Tue 15-Apr-14 03:31 by prod_rel_team

ROM: System Bootstrap, Version 15.0(1r)M15, RELEASE SOFTWARE (fc1)

NMS_1941_PLDTF uptime is 3 days, 18 hours, 28 minutes
System returned to ROM by power-on
System restarted at 16:56:36 GMT Fri Aug 4 2017
System image file is "flash0:c1900-universalk9-mz.SPA.152-4.M6a.bin"
Last reload type: Normal Reload
Last reload reason: power-on

This product contains cryptographic features and is subject to United
States and local country laws governing import, export, transfer and
use. Delivery of Cisco cryptographic products does not imply
third-party authority to import, export, distribute or use encryption.
Importers, exporters, distributors and users are responsible for
compliance with U.S. and local country laws. By using this product you
agree to comply with applicable laws and regulations. If you are unable
to comply with U.S. and local laws, return this product immediately.

A summary of U.S. laws governing Cisco cryptographic products may be found at:

If you require further assistance please contact us by sending email to

Cisco CISCO1941/K9 (revision 1.0) with 491520K/32768K bytes of memory.
Processor board ID FGL173911F0
2 Gigabit Ethernet interfaces
1 terminal line
DRAM configuration is 64 bits wide with parity disabled.
255K bytes of non-volatile configuration memory.
255488K bytes of ATA System CompactFlash 0 (Read/Write)

License Info:

License UDI:

Device# PID SN
*0 CISCO1941/K9 FGL173911F0

Technology Package License Information for Module:'c1900'

Technology Technology-package Technology-package
Current Type Next reboot
ipbase ipbasek9 Permanent ipbasek9
security None None None
data datak9 Permanent datak9

Configuration register is 0x2102

nd sh proc cpu sort | ex 0.00

Thanks in advance

Hall of Fame Super Gold

What is the bandwidth of the

What is the bandwidth of the link?

NOTE:  That's an old IOS.

Community Member

The bandwidth is 16mbps.If I

The bandwidth is 16mbps.

If I would update this to latest IOS. What IOS should I put.

Hall of Fame Super Gold



Super Bronze

Cisco recommends a 1941 for

Cisco recommends a 1941 for up to 25 Mbps (duplex) bandwidth.

As most of your CPU appears to be "interrupt" usage, and looking at your bandwidth graphs, your CPU consumption might be reasonable.

If that's so, the only way to lower CPU would be to review your configuration and insure that anything that doesn't need doing, isn't, or if needed, it's done as optimally as possible.

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