High CPU Utilization Cisco 1941 Router

[jtillman11]

The CPU utilization has been averaging about 65% which is way up from its usual 3-5%. When I do a "show processes cpu sorted" I do not see anything using a high amount of CPU. What could it be/where else should I look?

[Georg Pauwen]

Hello,

the voice policy is not applied anywhere, so it it not working. Also, you match all IP traffic...for a 'real' voice QoS, you would need to match only certain ports...

Can you check what the 'variance 2' is needed for ? It causes EIGRP to use more than one route if certain conditions are met...is that what you want ?

[jtillman11]

We have an alternate route that we are currently using for unequal-cost load balancing in EIGRP. We will be changing this soon by removing the variance command but for now it is find. Could you explain why it seems that the "no ip nbar protocol-discovery" interface subcommand fixed the high cpu utilization issue?

[Georg Pauwen]

Hello,

NBAR can be CPU intensive due to interrupts (which you don't see with 'show proc cpu'). How old is the 1941 ? There is a first and a second generation, if your 1941 belongs to the first, it is not really that powerful...

[jtillman11]

In the output of show proc cpu, it shows two percentages separated by a forward slash. It’s my understanding that the second percentage is the interrupts utilization, yes? It looks like almost all of my utilization was caused by these interrupts.

How do I see which generation my 1941 is? Anything from the sh ver command? I know it has been in place at least 6-7 years but not sure after that.

[Georg Pauwen]

Hello,

can you post the output of 'show ver' ?

[Georg Pauwen]

Hello,

what I meant to say is that the interrupts don't show up in the list of processes.

'show version' should list a serial number, there are various tools which allow you to look up the details of a device based on the serial number...

[jtillman11]

Here is show ver

CEMC-Adel1941#show ver
Cisco IOS Software, C1900 Software (C1900-UNIVERSALK9-M), Version 15.1(4)M4, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2012 by Cisco Systems, Inc.
Compiled Tue 20-Mar-12 17:58 by prod_rel_team

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

CEMC-Adel1941 uptime is 23 weeks, 4 days, 9 hours, 6 minutes
System returned to ROM by reload at 12:37:02 UTC Mon Feb 26 2018
System restarted at 08:01:02 EASTERN Mon Feb 26 2018
System image file is "flash0:c1900-universalk9-mz.SPA.151-4.M4.bin"
Last reload type: Normal Reload
Last reload reason: Reload Command

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
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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:
http://www.cisco.com/wwl/export/crypto/tool/stqrg.html

If you require further assistance please contact us by sending email to
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Cisco CISCO1941/K9 (revision 1.0) with 487424K/36864K bytes of memory.
Processor board ID FGL162722M6
6 Gigabit Ethernet interfaces
1 terminal line
DRAM configuration is 64 bits wide with parity disabled.
255K bytes of non-volatile configuration memory.
250880K bytes of ATA System CompactFlash 0 (Read/Write)

License Info:

License UDI:

-------------------------------------------------
Device# PID SN
-------------------------------------------------
*0 CISCO1941/K9 FGL162722M6

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 None None None

Configuration register is 0x2102

Does that mean the serial number is FGL162722M6?

[jeramemo]

what does this make changes to the working environment, also can you let me know the commands in brief

no ip source-route
no class-map match-all voice
no policy-map VoiceTraffic
no ip nbar protocol-discovery
no ip default-gateway 10.0.0.254
no access-list 102