[j-nsp] Throughput monitoring on pp0 units (Branch SRX)

[Andrew Jones]

Hi,
I'm trying to monitor throughput on individual pppoe connections on a 
branch SRX, using SNMP. For example, SRX110 with a PPP dialer on the DSL 
port and another PPPoE connection on an ethernet interface.

If I monitor pp0, I seem to get the aggregate throughput, but if I 
monitor pp0.0, for instance, I hardly see any traffic at all, even 
though the link is being heavily used.

Am I doing something incorrectly, or is this a junos bug/limitation? 
How are others monitoring this type of thing?
Thanks,
Andrew