Best practices for MCLT Time and State Switchover interval enterprise environment?

[Max Coder]

Hi,

I have 2 DHCP/DNS/AD servers. DHCP is running in Hot/standby mode.

1  - by default 5% of the addresses are reserved for the standby server. what exactly does that mean?
AFAIK , While operating in a Communication Interrupted state it only makes use of addresses from its reserved pool
There are 18 DHCP scopes.  Total number of addresses : 3328 So, is it 5 percent of 3328 or is it 5 percent for each scope?

2 -  Should the “Auto state switchover interval” value be equal to or greater than the “Maximum client lead time” value?

It would be so much appreciated if you include your own definitions of MCLT & ASSI in your responses.


3 - If the primary server comes back online, will it take ownership of all scopes again?
or do both servers need the MCLT time to be expired for it to become normal? I mean, do I have to wait 1 hour?  or MCLT + ASSI 2 hour ?

Thanks in advance!