little confusion on trying to get snmp working for some mrtg graphs

Ok I resolved the first issue. The problem was that my client, by default, did not include a pre-configured snmp.conf file in /etc/snmp. I create it and added just the two lines:

mibdirs /usr/share/snmp/mibs
mibs +ALL

That causes snmp to recognize the F5 files.

Ok, so then I run this command:

snmpget -On -v2c -c wm-prod-lb-ro 10.1.0.5 ltmVirtualServStatClientBytesOut.\"my_vip\"

which with the -O returns the OID. But now I am stuck trying to get the OID to be recognized by mrtg. This Target line:

Target[forum]: ltmVirtualServStatClientBytesOut.my_vip&ltmVirtualServStatClientBytesIn.my_vip:wm-prod-lb-ro@10.1.0.5:

don'te work. And neither does using the OID's.

help?