[j-nsp] Netflow config for MX204

[Tarko Tikan]

hey,

> I've used IPFIX before, here is an example of how that might be setup,
> whether it is good or not I'll let others judge and I can fix if there
> is feedback:
> 
>    <https://github.com/jtkristoff/junos/blob/master/flows.md>

I don't have any 204s but perhaps use flex-flow-sizing instead manual 
table sizes?

And if you do a lot of flow then you need to raise flow-export-rate from 
default as well.

-- 
tarko