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Questions on IP and IP-less DAG

Dear Experts, I'm studying the DAG of Exchange server. Is my understanding correct?


Assume that our environment is having:

- 1 AD server 2012R2 (IP address: A.B.C.30 / 24) 

- 1 Exchange server 2016, running on address: mx1.domain.com (IP address: A.B.C.21 / 24) 

- 1 witness server 2012R2 (IP: A.B.C.25 / 24)


and now we are adding the 2nd Exchange server (IP: A.B.C.22 / 24) to create a new DAG. 


1. With IP-less DAG, is the access domain still separated? For example: when MX1 goes down, users still need to change their web browser to mx2.domain.com to access the mailbox?  Cannot use mx1.domain.com anymore? Is there any solution from public DNS?


2. With IP-DAG, we will have a shared name to use between 2 Exchange servers, for example mail.domain.com? Then when MX1 or MX2 goes down, users can use mail.domain.com normally?


3. What are the pros and cons of IP and IP-less DAG?


Many thanks in advance!


ExchangeEmail ServersWindows Server 2012NetworkingVirtualization

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Last Comment
Seth Simmons

8/22/2022 - Mon
ASKER CERTIFIED SOLUTION
Hayes Jupe

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ASKER
DP230

Hi, I'm asking about the operations actually. Why don't users need to change the owa's address from mx1.domain.com to mx2.domain.com? I thought when mx1 goes down, we need to do that? And If so, how should I configure the DNS or something else to achieve that?

how can I configure a shared name for both MX1 and MX2, for example: mail.domain.com?

And I have to configure each other's send and received connectors just like standalone method?
SOLUTION
Amit

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DP230

Hi, many thanks for the article, I'm trying to have the failover actually.
Today I removed the IP-less DAG and add a new one DAG01.domain.com with IP - A.B.C.23; I also defined the A record of DAG01 and MAIL on AD/DNS; so that users can access owa via DAG01.domain.com or MAIL.domain.com

When I tested the DAG's operations, I found that the failover process is quite slow. For example when 2 nodes are running and MX1 is cluster owner, then I turned off the MX1 => it took about 5 mins for Exchange to work properly again (MX2 now is cluster owner) although DAG01 cluster realized it immediately (and changed its owner to MX2).

So how can I improve failover performance? fasten the process? Thanks!


Seth Simmons

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-- 'Hayes Jupe' (https:#a43331362)
-- 'Amit' (https:#a43331596)


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