Router 2600 CPU Usage 100%

Answered Question
Feb 17th, 2009
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I have the below router in production which is showing CPU usage 100% during some file transfer between the segments.


IOS (tm) C2600 Software (C2600-I-M), Version 12.3(19), RELEASE SOFTWARE (fc2)


I am using only two fast ethernet interfaces on this router which are connected to a cisco switch and are autonegotiated to 100MBPS. IP CEF is also set on the router.


Is it natural for the router to show CPU usage 100% during big file transfer? Is there any work around?

Correct Answer by Leo Laohoo about 8 years 1 month ago

The 3560 is a multi-layer (L2/L3). You can do OSPF if you have the Enhanced license installed.

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Overall Rating: 4 (2 ratings)
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Paolo Bevilacqua Tue, 02/17/2009 - 17:59
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There is no work around. The performances of the 2600 are just not adequate for fast ethernet, and it is also slowing down the file transfer


Get a bigger router or perhaps a L3 switch like an 8 ports 3560, that is very cost effective.

avilt Wed, 02/18/2009 - 16:56
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My current router is running OSPF with 2 fa interfaces. I am not looking for a switch though, but can I use the above switch as router as well?

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Leo Laohoo Wed, 02/18/2009 - 17:31
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The 3560 is a multi-layer (L2/L3). You can do OSPF if you have the Enhanced license installed.

Leo Laohoo Wed, 02/18/2009 - 19:03
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Thanks for the rating.

avilt Sun, 04/05/2009 - 21:42
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I have some more queries.

1. How can I see the active traffic session on the router like netstat -n on windows?

2. I have set IP CEF on my router. Is it O.K? Do I need to configure ip route-cache {path} or Fast switching on any interface?

CPU utilization on my router goes high even when I transfer a 50MB file.


Joseph W. Doherty Mon, 04/06/2009 - 03:38
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"CPU utilization on my router goes high even when I transfer a 50MB file."


Yes, that's to be expected! Reread Paolo's post.


For even a single FastEthernet interface, you need a much, much faster software router or a L3 switch. (The software routers are often most suitable for WAN bandwidths.)


PS:

#1 netflow cache or IP accounting stats might provide the information you want


#2 generally you always want CEF active, with it you don't need route-cache (CEF is even better than fast switching), however you might also activate flow cache

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