This object is used to determine the end of address shortage.
When the number of free addresses is equal to or greater
than the value contained by this object the
ciscoNetRegFreeAddrHighThreshold notification will be
generated. The ciscoNetRegFreeAddrHighThreshold
notification will only be generated when the first time
the cnrNotifDHCPScopeFreeAddrHigh is exceeded.
These thresholds objects and notifications apply to scopes
defined for the DHCP server. The cnrDHCPScope object
indicates to which scope these objects and notifications
are to be applied.