[rbak-nsp] List connected subs via SNMP

[Jim]

Is it possible to get a list of subs connected to an SE800 via SNMP by 
either username or Session ID?

I looked through the mib and found these two which appears to be what I 
require:

redBackNetworks(2352).rbnMgmt(2).rbnSubscriberActiveMib(27).rbnSubsActiveObjects(1).rbnSubsActive(1).rbnSubsActiveTable(1).rbnSubsActiveEntry(1).rbnSubsActiveName(1)
redBackNetworks(2352).rbnMgmt(2).rbnSubscriberActiveMib(27).rbnSubsActiveObjects(1).rbnSubsActive(1).rbnSubsActiveTable(1).rbnSubsActiveEntry(1).rbnSubsActiveSessionId(2)

However a walk of those returns nothing, but if I do a walk on the next 
one which is CircuitDescription I get a list of descriptions for all users:

redBackNetworks(2352).rbnMgmt(2).rbnSubscriberActiveMib(27).rbnSubsActiveObjects(1).rbnSubsActive(1).rbnSubsActiveTable(1).rbnSubsActiveEntry(1).rbnSubsActiveCircuitDescr(3)

Should a walk of rbnSubsActiveName and rbnSubsActiveSessionId return 
values?  Is there somewhere else I can get a current list of all 
connected subscribers from the device? (I want to compare to this to our 
Radius database periodically).

Thanks.

Jim.