[mrtg] can't get traffice from sub-interface of router

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hello,guys. I have run mrtg2.10 successfully recently. Now it can monitor the 
traffic of ATM aal5 layer, but can't get the value of ATM subinf & gigaethernet's
subif. the gigaethernet port has been configured as 802.1q trunk.
Why mrtg can generate the conf of subif,but can't get the data from those subifs?
plz help me.

the following is the error msg from MRTG, I have tried to get the data using SNMP
v4 by the msg but failed... 

SNMP Error:
Received SNMP response with error code
  error status: noSuchName
  index 1 (OID: 1.3.6.1.2.1.2.2.1.10.18)
SNMPv1_Session (remote host: "192.168.0.1" [192.168.0.1].161)
                  community: "public"
                 request ID: 1030702553
                PDU bufsize: 8000 bytes
                    timeout: 2s
                    retries: 5
                    backoff: 1)
SNMPGET Problem for ifInOctets.18 ifOutOctets.18 sysUptime sysName on
public at 192.168.0.1::::::v4only



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