[c-nsp] Netflow/Sflow for "irrelevant" traffic?

[Nick Hilliard]

Radu-Adrian FEURDEAN wrote on 31/07/2020 19:28:
> For sFlow, most (??? all ???) platforms sample*inbound*  traffic only.

Pretty much all chipsets that support sflow allow both ingress and 
egress sampling, even though some of the operating systems don't 
necessarily have the command constructs to configure this.

No idea about Cisco's other operating systems, but NX-OS only supports 
joint ingress + egress sampling and there's no way to turn off egress 
sampling.  Hard to tell what the rationale for this is.  At least on the 
earlier sflow-enabled broadcom platforms, the switch hardware API 
supports it and you can toggle it in bcmsh, so their decision not to 
enable this as a config setting seems to be a bit dysfunctional.

Nick