Specified FC Ports that can register as control nodes. The
number of rows is dependent on the number of possible FC
Port Control Nodes, and if SNMP is enabled to view control
node information, as indicated by cIsnsSrvrInstCntrlNodeAuth.
This table is accessible and usable to view and/or modify the
set of control nodes if cIsnsSrvrInstCntrlNodeAuth is set to
the viewNodes or modifyNodes value.