[c-nsp] Latency Spike

[Pete Lumbis]

Go to Cisco Live 365 and watch my talk called "IOS Routing Internals" from
San Francisco this year. I address exactly this (spoiler: it's what Darren
said)

-Pete


On Thu, Jul 31, 2014 at 1:10 AM, Samol <molasian at gmail.com> wrote:

> Hi All,
>
> Just experienced spike when doing the continuous ping as the result below:
>
> 64 bytes from x.x.152.3: icmp_seq=421 ttl=255 time=3.53 ms
>
> 64 bytes from x.x.152.3: icmp_seq=422 ttl=255 time=2.40 ms
>
> 64 bytes from x.x.160.152.3: icmp_seq=423 ttl=255 time=1.49 ms
>
> 64 bytes from x.x.152.3: icmp_seq=424 ttl=255 time=3.15 ms
>
> 64 bytes from x.x.152.3: icmp_seq=425 ttl=255 time=2.05 ms
>
> *64 bytes from x.x.152.3: icmp_seq=426 ttl=255 time=107 ms*
>
> 64 bytes from x.x.152.3: icmp_seq=427 ttl=255 time=47.4 ms
>
> 64 bytes from x.x.152.3: icmp_seq=428 ttl=255 time=3.77 ms
>
> 64 bytes from x.x.152.3: icmp_seq=429 ttl=255 time=1.12 ms
>
> 64 bytes from x.x.152.3: icmp_seq=430 ttl=255 time=1.35 ms
>
> --- x.x.152.3.152.3 ping statistics ---
>
> 500 packets transmitted, 500 received, 0% packet loss, time 25285ms
>
> *rtt min/avg/max/mdev = 0.634/4.021/107.242/9.067 ms, pipe 2*
>
>
> I tested this segment by segment (point to point) between the two devices,
> and I still see this latency spike. I assume this is normal in the network
> as router/switch needs time to calculate and send back to source.
>
>
> Is There anyone experienced this or anything can cause this ?
>
>
> Regards,
>
> --
> Samol Khoeurn
> (855) 077 55 64 02 / (855) 067 41 88 66
> Network Engineer
> Cisco: CCNA/CCNP SP/CCIP/
> Juniper: JNCIA/JNCIS-ENT,SP,SEC/JNCIP-ENT
> www.linkedin.com/in/samolkhoeurn
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