Re: ASR-9K CPU troubleshooting

[Rukka Pal <regezos () gmail com>]

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 () 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.
>
> Micah
>
>
> On Tue, Apr 19, 2016 at 4:06 PM, Laurent Dumont <admin () coldnorthadmin com>
> wrote:
>
> > It coincides with nothing else? More traffic? CPU increasing at regular
> > intervals every day without any obvious reasons is probably something
> worth
> > looking into!
> >
> > On 4/18/2016 2:14 PM, Scott Weeks wrote:
> >
> > > --- regezos () gmail com wrote:
> > > From: Rukka Pal <regezos () gmail com>
> > >
> > > How do you guys troubleshoot high CPU utilization on the ASR-9K
> platform?
> > > Detailed guides are available for IOS platforms, but I can't seem to
> find
> > > 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
> day
> > > it increases to 40% and stays there for about an hour (20% spp + 10%
> netio
> > > + 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
> the
> > > investigation I had to realize that I simply don't have the tools to
> > > troubleshoot the ASR CPU.
> > > -----------------------------------
> > >
> > >
> > > On cisco: sho proc cpu
> > >
> > > scott