Most routers set the SNMP interface ID upon bootup and I haven't seen an easy way to get this from any device yet from the CLI. You can do a snmpwalk on ifName or ifDesc and get the interface that is associated with 102 in your case.
<br><br>The OID to get the In/Out counters is ifInOctets/ifOutOctets (32 bit counters) or ifHCInOctets/ifHCOutOctets (64 bit counters). 64 bit should always be used on speeds over 100Mb to prevent the counter from looping more than once during your polling interval.
<br><br>To get the full OID add "-On" for numerical output or "-Of" for text output to your snmpwalk command.<br><br>Paul