The next available portal index for adding an unregistered
portal to a discovery domain. The portal index used for a
specific portal is persistent across server reinitializations
only when the portal is an explicit member of a Discovery
Domain (DD). This managed object is used when an unregistered
portal is to be explicitly added to a Discovery Domain prior
to it being registered in the server using the iSNS protocol.
Registered portals have an entry in the cIsnsRegPortalTable.
If a portal is already registered in the server, or is
already a member of a Discovery Domain, then it will already
have a portal index, and the use of this managed object is not
required. The same portal index MUST be used for any
additional DD membership registrations for the same portal.