i need to understand how DHCP failover is done from 1 windows server 2008 to another window server

also if i want to upgrade dhcp from windows server 2008 to windows server 2012

what should all be considered? is there any shell i have to use
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you need to setup failover cluster upto 2008 R2 OS where another server can take over if 1st server goes down. This is typical failover cluster with shared quorum
U can update DHCP from 2008 to 2012, its very straight forward process:
backup DHCP database on 2008
restore it on 2012 server having dhcp role installed
uninstall 2008 dhcp server role
step by step:

U can use software based cluster with 2012 DHCP server where you don't need shared storage and cluster service for same if you have two windows 2012 dhcp servers

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Setup two DHCP servers with identical scopes, use excluded ranges to differentiate which Ips each server allocates.
Static Io exclusion should exist on both, any DHCP based reservation must be setup on each.
Commonly the break is a 80/20 or you can use 65/35 of the dynamically allocated Ip space.
You could leave them, or properties of the one you would like to function as the secondary, delay its response to a dhcpdiscovery to 1 or 2, this way your designated primary will respond to clients looking for an ip, and only when the primary will have issues, the secondary having also received a request, will respond.
Cluster for DHCP IMHO is unnecessary.

I.e your scope is 192.169.02-
The first 2-31 static IPs exclude range on both
32-40 DHCP assigned reservation, add these on both
Server1 allocates 41-191exclude 192-254
Server2 allocates 192-254 exclude 41-191

The point of the exclusion is to about issuing an IP previously allocated by the other DHCP server (connected devices on network must have unique IPs)
A DHCP server only has info on IPs it allocates and has allocated.
pramod1Author Commented:
Commonly the break is a 80/20 or you can use 65/35 of the dynamically allocated Ip space.-can you please elaborate more on this
You can break it any way you want.

What do you want me to elaborate on?
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