Sub Interfaces

Hi all,

I'm new with cricket. I want to monitor de Discards packages on the 
sub-interfaces of my Cisco 7200 router.
So far cricket is graphing the Discards (ifInDiscards) on the main 
interface, but when i try the same config
with the sub-if I don't get any values.
I'd appreciate any help with this.
Thanks.

P.S: this is part of how i have the cricket configured right now:

# ifInOctets and ifOutOctets come from above, since they
# are used by switch-ports as well

datasource ifInErrors
        ds-source       =       snmp://%snmp%/ifInErrors.%inst%

datasource ifOutErrors
        ds-source       =       snmp://%snmp%/ifOutErrors.%inst%

datasource ifInUcastPackets
        ds-source       =       snmp://%snmp%/ifInUcastPkts.%inst%

datasource ifOutUcastPackets
        ds-source       =       snmp://%snmp%/ifOutUcastPkts.%inst%

targetType  standard-interface
        ds      =       "ifInOctets, ifOutOctets, ifInErrors, ifInDiscards,
                                ifOutErrors, ifInUcastPackets,
                                ifOutUcastPackets, ifInNUcastPackets,
                                ifOutNUcastPackets"
        view    =       "Octets: ifInOctets ifOutOctets,
                UcastPackets: ifInUcastPackets ifOutUcastPackets,
                Errors: ifInErrors ifOutErrors,
                Discards: ifInDiscards"

targetType  sub-interface
        ds      =       "ifInOctets, ifOutOctets"
    view                =       "Octets: ifInOctets ifOutOctets,
                                 Discards: ifInDiscards"


-- 
Danilo Perdomo
Ingeniero de Operaciones NOC
VP Operaciones Técnicas
Inter Barquisimeto - MSO
Ext.: 5393
Tlf.: 58-251-3355393 
      58-251-9355393
Cel.: 58-414-5750938
www.inter.com.ve


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