[c-nsp] Huge SP CPU usage spikes 100%

[James Bensley]

On 1 March 2018 at 08:29, james list <jameslist72 at gmail.com> wrote:
> Dear experts,
> has anybody experienced a 100% SP CPU usage on C6500-Sup720 (12.2(33)SXI5)
> with a lot of interrupts ?
> The main process is Heartbeat.
>
> Cisco TAC is struggling in having an idea to sorting out the issue, they
> are working since 3 days on it..
>
> STP is stable, no mac moving, no real issue found… maybe somebody
> experienced the same due to something in particular?
>
> Thanks for any hints.
>
> Cheers,
> James
>
>
> xxx#remote command switch show process cpu sorted
>
> CPU utilization for five seconds: 91%/83%; one minute: 96%; five minutes:
> 97%

When you say a lot of interrupts, what do you get from:

show platform netint
remote command switch show platform hardware earl status
show ibc
show eobc

I don't know what that Heartbeat process is for, e.g. between SP and
RP, or SP and DFCs, or SP and line cards etc. In terms of fixing the
issue, perhaps reboot the RSP or line card? That obviously doesn't
give you a root cause though :)

It seems like the process is stuck in a loop if you are saying that
forwarding is working without issue.

You could run a NetDR capture to see if that is control-plane traffic
and maybe where its coming from or going to:
https://null.53bits.co.uk/index.php?page=netdr-captures

Cheers,
James.