[c-nsp] C6800 Sup2T buffering ?

[Saku Ytti]

On Wed, 20 May 2020 at 23:45, james list <jameslist72 at gmail.com> wrote:

Hey,

> Dear experts
> my customer have some multicast flows which are detected sometime with
> peaks/latency.

> They report 10-15 ms average latency and sometimes they detect 500-600 ms.

I wouldn't put it past measuring error. Is 10-15ms expected? I.e. this
is like 1000km?

However based on just information available, perhaps flows timeout
periodically and hit the control-plane. I think SUP2T like PFC3 before
it punts all mcast, then programs flow in HW, then subsequently
hardware format it. If so, perhaps you can tune with multicast flow
timers.

> - what I can use to try to decode pcap taken on Arista switch to check if
> the latency is really obtained checking protocol market timestamp ?

Several samples, coffee and time.

-- 
  ++ytti