[j-nsp] dsc interface on qfx5100

[sthaug at nethelp.no]

>> Yes we (large ISP) tried using dsc interfaces (MX series) to count RTBH
>> traffic and found, 1) they don't count, and 2) IPv6 is unsupported for dsc.
>> As with many Junos features, there is not parity between IPv4 and IPv6.
>> That alone bugged us, but especially as the counters did not work, we
>> abandoned dsc and just made the IPv4 RTBH sink a discard route:
> 
> I'm pretty convinced I've had filter counters work on discard
> interface, but it's like 15 years ago, so I may misremember.

I can confirm that filter counters work on the discard interface at
least for IPv4 and JunOS 15.1R6.

Steinar Haug, Nethelp consulting, sthaug at nethelp.no