DAG on Exchange 2010 and Exchange 2013 mixed mode

Have following servers:

DC Windows 2008
Exchange 2010 mbx on Win 2008r2 Site 1
Exchange 2013 mbx on Win 2012r2 Site 1
Exchange 2013 mbx on Win2012r2 Site 2

The exchange 2010 does not have DAG setup before, we are in process of migration from Exchange 2010 to Exchange 2013.  We started building DAG only between Exchange 2013 servers. I am not sure if the DAG setup is same in Mixed mode will support. We had set the service connection point to Exchange 2010. Does it affects DAG? Do we have any article saying how to build DAG in mixed mode environment during co-existence.
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Ganesh Kumar ASr Infrastructure SpecialistAsked:
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Will SzymkowskiSenior Solution ArchitectCommented:
Exchange 2013 is completely separate with co-existence. DAG will operate normally if you have Exchange 2013 setup in a DAG. Exchange 2010 will not care nor be affected.

Although Exchange 2013 and 2010 are completely separate they will still inter-operate between each other for routing mail etc.

Ganesh Kumar ASr Infrastructure SpecialistAuthor Commented:
I have problem in adding the DAG of the DR server. The DAG is created, I could add the excahnge in primary site.

When i add the secondary DAG member of the Exchange2013 in DR site i get following error.
Error: An error occurred while attempting a cluster operation. Error: Cluster API failed: "AddClusterNode() (MaxPercentage=100) failed with 0x5b4. Error: This operation returned because the timeout period expired"

After digging few things, i tried rebooting the server multiple times, but it didn't help.
In the DR Exchange 2013, the cluster service is not starting and it was throwing error.
Windows could not start the Cluster Service on Local Computer. For more information, review the System Event Log. If this is a non-Microsoft service, contact the service vendor, and refer to service-specific error code 2.

We have 2 MB link between primary and DR site. I am not sure if this bandwidth is sufficient enough. What is the recommended bandwidth?

Have attached the snapshot of the databases, the db which was in DR site shows unknown and when i checked the properties i got below error.
A server-side administrative operation has failed. The Microsoft Exchange Replication service may not be running on server server.domain.com. Specific RPC error message: Error 0x71a (The remote procedure call was cancelled) from RpccGetCopyStatusEx4
I am not sure which one to fix. Any suggestions please.
Ganesh Kumar ASr Infrastructure SpecialistAuthor Commented:
Somehow i fixed the error and now when i ran the powershell to add the DAG member it worked fine. the DB is replicating and all works fine. But when i check the ECP it is not updating? Any suggestions
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Will SzymkowskiSenior Solution ArchitectCommented:
Have you tried power cycling the Exchange servers?

Ganesh Kumar ASr Infrastructure SpecialistAuthor Commented:
Yes we have tried, what i want is to know why the status of DR site database still shows unknown.

This url solved the issue : http://exadminmcse.blogspot.com/2012/05/troubleshooting-exchange-2010-dags.html

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Ganesh Kumar ASr Infrastructure SpecialistAuthor Commented:
Found it myself
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