Exchange server 2010 redundancy using static IPs in different sites

Question

Dear All;
We are facing a problem in Exchange server 2010 which is that we need to provide redundancy for two different sites which contain the same exchange databases using DAG but the issue is that if the main exchange server fails, users from the internet will
not be able to access the server because the main static IP is in the main site ...
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My question is how to provide redundancy using two Global IPs in two different sites, and is there any consequences of doing such a setup?
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Answer 1

Hi,
From your description, I would like to clarify the following things:
1. It is recommended to configure the IP Configuration for both the MAPI and Replication NIC on DAG nodes.
2. A site failure is managed differently from the types of failures that can cause a server or database failover. A site failure is considered to be a disaster recovery event, recovery should be manually performed and completed for the client service to
be restored and for the outage to end.
For more information, here is an article for your reference.
Switchovers and Failovers
http://technet.microsoft.com/en-us/library/dd298067(v=exchg.141).aspx
Besides, what do you mean by "global IPs"?
Hope it helps.
Best regards,
Amy
Amy Wang
TechNet Community Support