An object identifier which points to the SNMP Mib Arc for
that particular component class. For example, a
replication of 1.3.6.1.4.1.562.36.2.1.12 (iso.org.dod.
internet.private.enterprises.nortel.mscCarrier.mscPassport.
mscComponents.mscLp) corresponds to the Lp component class.