Exchange 2010 DAG–Collapse the MAPI networks in a DAG

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To avoid DAG switchover issues, you should always collapse the MAPI networks in a DAG.

The following Technet article state that we “should” or we “must” do it:

https://technet.microsoft.com/en-us/library/dd298065.aspx#Dat

https://technet.microsoft.com/en-us/library/dd638104.aspx#NR

 

… and Tim McMichael explains why :

https://blogs.technet.com/b/timmcmic/archive/2011/09/26/exchange-2010-collapsing-dag-networks.aspx