This column together with the next column - avstrTrackerPtrsValue uniquely identify the object pointing to this object-tracker, in a machine-friendly manner. This column provides the semantics for interpreting the contents of the next column - avstrTrackerPtrsValue: none(1) - next column is N/A trackerList(2) - next column is taken from avstrTrackerId of the object-tracker list that points to this object-tracker. ifIndex(3) - next column is InterfaceIndex TC (IF-MIB) isakmpPeer(4) - next column is avipsIsakmpPeerIdType followed by avipsIsakmpPeerId (AVAYA-IPSEC-MIB). ipStaticRoute(5) - next column is the following OIDs in the following order: {ipCidrRouteStaticDest, ipCidrRouteStaticMask, ipCidrRouteStaticIfIndex, ipCidrRouteStaticNextHop, ipCidrRouteStaticPreference} (CROUTE-MIB). ipPbrNhListEntry(6) - next column is the following OIDs in the following order: {nextHopListIndex, nextHopIndex} (CROUTE-MIB).