failover timeout

[Abu Abdulla alhanbali]

Hi,

i would like to know how long it will take the secondary DHCP server
to start assigning IPs for all users (including the ranges dedicated
to the primary) in case the primary DHCP is down? is it a
configurable?

i would like also to ask if the DHCP can handle 200K users or above
assuming the H/W is capable and the lease time is big enough (more
than one week). is it recommended to run multiple instances or let one
instance handle this number.

thanks