One of the great changes to Exchange 2010 SP1 was that a DAG static IP address can be set using the EMC.  Prior to this in RTM the EMS had to be used to set a static IP.  An example of this would be:

Set-DatabaseAvailabilityGroup -Identity TailspinDAG1

-DatabaseAvailabilityGroupIpAddresses 192.168.2.150
(note this is a single line that may wrap)
 

Scott has this and many other great details on his blog here:

http://blogs.technet.com/b/scottschnoll/archive/2010/04/10/new-high-availability-features-in-exchange-2010-sp1.aspx 

If you do not subscribe to his RSS feed, I’d highly recommend that you do so – the feed is here: RSS for posts 

 

Anyway, back on target red leader!

In the SP1 EMC to revert the DAG to using DHCP, simply remove all the IP Addresses that were assigned. 

But how can you revert a DAG back to using DHCP in EMS you may ask? 

Set-DatabaseAvailabilityGroup -Identity TailspinDAG1 -DatabaseAvailabilityGroupIpAddresses 0.0.0.0

(note this is a single line that may wrap)

 

Full documentation for Set-DatabaseAvailabilityGroup is here:

Set-DatabaseAvailabilityGroup

 

Cheers,

Rhoderick