ASR-9K CPU troubleshooting
regezos at gmail.com
Wed Apr 20 13:02:01 UTC 2016
This document (BRKARC-2017) turned out to be very useful to determine the
possible root-cause. The utilization of the spp and netio processes
increase if the router/line-card is software switching traffic, in our case
ICMP. We will test the policing feature and implement it.
On Wed, Apr 20, 2016 at 1:17 AM, Micah Croff <micahcroff at gmail.com> wrote:
> I've experienced similar behavior on other platforms as well. Sometimes
> the output of the box is not correct. We were able to prove this to the
> vendor by conducting experiments and graphing the CPU. One of the
> protocols they said "couldn't possibly be causing this" turned out to be
> the root of the problem.
> I live by one rule when troubleshooting:
> The box is a lie.
> On Tue, Apr 19, 2016 at 4:06 PM, Laurent Dumont <admin at coldnorthadmin.com>
> > It coincides with nothing else? More traffic? CPU increasing at regular
> > intervals every day without any obvious reasons is probably something
> > looking into!
> > On 4/18/2016 2:14 PM, Scott Weeks wrote:
> >> --- regezos at gmail.com wrote:
> >> From: Rukka Pal <regezos at gmail.com>
> >> How do you guys troubleshoot high CPU utilization on the ASR-9K
> >> Detailed guides are available for IOS platforms, but I can't seem to
> >> anything useful for the ASR.
> >> The average line-card (0/0/CPU0: A9K-24x10GE-TR) CPU utilization of my
> >> routers is about 10%, however recently I have noticed that 3-5 times a
> >> it increases to 40% and stays there for about an hour (20% spp + 10%
> >> + the rest).
> >> I know this is well withing the acceptable range, but I am the kind of
> >> person who likes to understand every change in his network and during
> >> investigation I had to realize that I simply don't have the tools to
> >> troubleshoot the ASR CPU.
> >> -----------------------------------
> >> On cisco: sho proc cpu
> >> scott
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