I would recommend using DHCP reservations in large organizations with many devices since it allows the administrators to have a common reference point for all IP address allocations in the organizations. When using the DHCP administration, there is a complete outline of all the active leases and all active reservations in one location. It is an important aspect in tracking down specific clients or even reallocating new scopes.
Short lease time in large companies allows frequent removal and connection of machines to the network without running out of the IP addresses available. Also, a short lease time enables the computer to hold on to the address for a short period which is a vital aspect of an organization with many devices yet a short IP range. Most of the desktops do not get a daily use as the laptops have taken up most of their functions. Due to this, short lease times would be very favorable for such desktop as it reduces configuration problems brought about by many active devices.
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Short lease time has a disadvantage, especially when used where the amount of load on the devices is high as it adds traffic to the network. If used where machines are frequently removed and connected to the network, one may run out of IP addresses available. Short lease time renders the devices unstable as their IP addresses keep changing frequently.
In case of an unavailable DHCP server, a short lease time helps free up addresses while the machines go off from the network unlike for long lease times. The typical lease time in big organizations is expected to be about eight days though it depends on allocation efficiency and stability.
