This read-only value identifies which routing controller, PAR, PNNI, or TAG, this resource-partition table row's allocation applies to, serving alongside cesmResPartPortNum as part of the table's index. An administrator uses it to see how the port's available LCN resources (via cesmResPartNumOfLcnAvail) are divided among the different controllers that might route connections onto that port. For example, a port shared between PNNI and TAG controllers would have two separate rows for that port, distinguished by this object showing pnni(2) in one and tag(3) in the other.