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

[Vincent Bernat]

 ❦ 22 juin 2017 00:28 +0200, Thomas Bellman <bellman at nsc.liu.se> :

> 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.

Related question: why isn't cut-through the default mode? Is there any
downside of this mode (apart from forwarding invalid frames which
shouldn't matter much nowaday)?
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