[j-nsp] Cut-through forwarding statistics on QFX5100

[Thomas Bellman]

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We have a QFX5100 on which we have enabled cut-throug forwarding
('set forwarding-options cut-through').  Now I am curious about
how effective that is.  Is there any statistics one can dig out
about how often the switch is able to do cut-through, and how
often it has to fall back to store-and-forward?  I haven't found
anything in 'show interfaces extensive', nor any other promising
'show' command.

The dream would of course be to get counters for every combination
of ingress and egress interface, but I would be happy to get just
counters for just ingress or egress, or even just a total for the
entire system.

The switch is running Junos 17.2R1 if that matters.


- -- 
Thomas Bellman,  National Supercomputer Centre,  Linköping Univ., Sweden
"We don't understand the software, and        ! bellman @ nsc . liu . se
 sometimes we don't understand the hardware,  !
 but we can *see* the blinking lights!"       ! Make Love -- Nicht Wahr!
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